CN103906490B - Method for producing stretchable sheet - Google Patents

Abstract

The invention provides a method for manufacturing a stretchable sheet, which includes: a process of applying an adhesive (9', 10') to one or both of a pair of strip-shaped sheets (50, 60); and an integrated process Sequence, make these belt-shaped sheets (50, 60) merge with the linear elastic body (7) conveyed by the conveying mechanism (16), pressurize integrally with the state of sandwiching the linear elastic body (7), and obtain expansion and contraction. A stretchable sheet (30A), in the method of manufacturing the stretchable sheet, the bonding conditions in the above-mentioned integration process between a pair of strip-shaped sheets (50, 60) are adjusted to the adhesive agent for forming the central bonding portion. (9') is different from the adhesive (10') for forming the end joint. For example, a pair of belt-shaped sheets (50, 60) are introduced between a pair of rollers (181, 182) to be pressed, and, as a pair of the rollers, an adhesive (10' for forming a central joint portion is used. ) and the pressure portion of the adhesive ( 9 ′) for forming end joints apply different pressures to a pair of belt-shaped sheets ( 50 , 60 ).

Description

Method for producing stretchable sheet

technical field

The present invention relates to a method for producing stretchable sheets.

Background technique

Conventionally, a so-called unfolded wing-type disposable diaper is known, which includes: a substantially elongated absorbent body having a front sheet, a back sheet, and an absorbent body disposed between the two sheets. a main body; and a pair of waist flaps arranged on both side edges along the length direction of the main body of the absorbent main body; The fixing part is fixed to the fixed area of the non-skin-facing surface of the absorbent main body, and is worn on the wearer. As the waist panel, a stretchable sheet member (stretchable sheet) is used from the viewpoint of wearability and the like.

For example, in Patent Document 1, as an unfolded flap-type disposable diaper using a stretchable sheet for the waist flap, it is described that a plurality of threads are bonded and fixed between two sheets in an extended state. A belt-type disposable diaper in which a stretchable sheet made of an elastic body is used as a waist flap (fixing belt). In the fixing tape described in Patent Document 1, the two sheets are formed by a vertical stripe-shaped adhesive tape continuous from the upper end to the lower end of the fixing tape at a predetermined interval in the width direction (direction perpendicular to the longitudinal direction of the main body). Partial bonding.

In addition, in Patent Document 1, as a method of manufacturing the waist panel (fixing tape) of Patent Document 1, it is described that an adhesive is applied in the longitudinal direction to a sheet being conveyed in a longitudinal stripe pattern. After the sheet is helically wound on a pair of conveying belts, the linear elastic body in an elongated state stretched in a direction approximately perpendicular to the conveying direction of the sheet is merged and joined, and another The separate sheets are joined with the linear elastic body sandwiched between the separate sheet and the above-mentioned sheet, and they are integrally pressed through a pair of rollers to be integrated.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2010-22588

However, when the two sheets sandwiching the linear elastic body are pressed between a pair of rollers, when the adhesive applied in the form of vertical stripes is strongly pressed, the adhesiveness of the thin strip application will be reduced. The agent is crushed and spreads in the width direction of the sheet, thereby reducing the air permeability and flexibility of the stretchable sheet. On the other hand, when pressurization is performed at a low pressure in consideration of air permeability and flexibility, the linear elastic body is easily detached from the bonded portion fixing the linear elastic body in the stretched state.

In addition, in the stretchable sheet (fixing belt) described in Patent Document 1, the linear elastic body produced by cutting both ends of the linear elastic body wound in an extended state on the conveyor belt during its production is Due to the shrinkage of the linear elastic body after cutting, the ends (cut ends) of the linear elastic body are sometimes scattered in irregular directions, and the appearance of the stretchable sheet is deteriorated due to these irregular cut ends. .

In this way, as a method of eliminating the irregular arrangement state of the ends (cut ends) of the linear elastic bodies, the following method is considered: in the sheet constituting the stretchable sheet, the position where the ends are cut (stretchable) is considered. The end portion along the conveying direction of the sheet during sheet production), before forming the cut end (before the cutting process of the linear elastic body), an adhesive is applied in advance, and the adhesive is used to suppress the damage caused immediately after cutting. The movement of the cut end is caused by the shrinkage of the linear elastic body. However, in order to obtain a predetermined effect (correction of irregular arrangement of the cut ends of the linear elastic body) by this method, it is necessary to appropriately control the fixing strength of the cut ends to the sheet.

Contents of the invention

The present invention relates to a method for continuously producing a stretchable sheet in which a linear elastic body is interposed between a pair of strip-shaped sheets and the strip-shaped sheets. It is bonded and fixed in a state stretched in a direction intersecting with the conveying direction, and has a central joining portion at a central portion in the width direction of the stretchable sheet, and a pair of end joining portions on both sides of the central portion in the width direction.

The manufacturing method of the stretchable sheet of the present invention includes the following steps: a conveying step of winding the above-mentioned linear elastic body in a state of stretching in a direction intersecting with the above-mentioned conveying direction by using an elastic body winding mechanism; The conveying mechanism for the linear elastic body conveys the coiled linear elastic body in the conveying direction by the conveying mechanism; an adhesive agent for applying an adhesive to one or both of the pair of strip-shaped sheets Coating process; and integration process, make a pair of above-mentioned belt-shaped sheets after the above-mentioned adhesive coating process merge with the above-mentioned linear elastic body conveyed by the above-mentioned conveying mechanism, and a pair of the above-mentioned linear elastic body is sandwiched This belt-shaped sheet is integrally pressed to obtain the aforementioned stretchable sheet.

Furthermore, in the method for producing a stretchable sheet according to the present invention, the bonding conditions between the pair of strip-shaped sheets in the above-mentioned integration step are adjusted to the adhesive agent for forming the central joint portion and the end joint portion. The adhesive used for forming is different.

In a preferred embodiment of the present invention, in the above-mentioned integration process, a pair of the above-mentioned belt-shaped sheets is introduced between a pair of rollers to pressurize them, and, as a pair of the rollers, a material that is configured to be joined at the center of the pair of rollers is used. The portion that pressurizes the adhesive for forming the end portion and the portion that pressurizes the adhesive for forming the end joint are rollers that apply different pressures to the pair of belt-shaped sheets.

In addition, in another preferred embodiment of the present invention, in the above-mentioned integration process, a pair of the above-mentioned belt-shaped sheets is introduced between a pair of rollers to pressurize, and one side of the pair of belt-shaped sheets Or the time from applying the above-mentioned adhesive for forming the central joint to the time when the adhesive is pressed between a pair of rollers, and from the time of applying the adhesive for forming the above-mentioned end joint to the time when the adhesive is applied at the same time. The time for applying pressure to the adhesive differs between the pair of rolls.

Moreover, in still another preferred embodiment of the present invention, after the above-mentioned adhesive agent coating step, cooling or heating of the adhesive agent for the central joint portion or the adhesive agent for the end portion joint portion is performed, and In the above-mentioned integration process, the pair of the belt-shaped sheets is placed between a pair of rollers in a state where the above-mentioned two adhesives in a state of different temperatures due to cooling or heating are present between the pair of the above-mentioned belt-shaped sheets. Pressurize.

The elastic sheet in the present invention is preferably bonded and fixed between a pair of strip-shaped sheets with a linear elastic body stretched in a direction intersecting the conveying direction of the strip-shaped sheets. The width direction central part of the sheet has a central joint part, and has a pair of end part joint parts on both sides of the width direction central part.

In addition, the present invention provides a disposable diaper comprising: an abdominal portion positioned on the abdominal side of the wearer when worn, a dorsal portion positioned on the back side, and a crotch portion positioned between the abdominal portion and the back portion. Absorbent main body; and a pair of left and right waist flaps connected to the left and right sides of the back side. The waist flaps use the elastic sheet obtained by the above-mentioned manufacturing method of the elastic sheet.

Description of drawings

Fig. 1 is a plan view showing a waist panel and an unfolded disposable diaper obtained by one embodiment of the present invention.

Fig. 2 is a perspective view showing a schematic configuration of an elastic sheet manufacturing apparatus suitable for carrying out a manufacturing method according to one embodiment (first embodiment) of the present invention.

Fig. 3 is a perspective view showing the structure of the upstream side of the rotating arm (elastic body winding mechanism) of the device shown in Fig. 2 .

Fig. 4(a) is a plan view of a part of the device shown in Fig. 2, and Fig. 4(b) is a plan view showing an example of a stretchable sheet produced by the device.

Fig. 5 is a diagram showing an integrated mechanism suitable for implementing a manufacturing method according to another embodiment (second embodiment) of the present invention.

6( a ) and ( b ) are diagrams showing a schematic configuration of an elastic sheet manufacturing apparatus suitable for carrying out a manufacturing method according to another embodiment (third embodiment) of the present invention.

Fig. 7 is a diagram showing a schematic configuration of an elastic sheet manufacturing apparatus suitable for carrying out a manufacturing method according to another embodiment (fourth embodiment) of the present invention.

detailed description

The present invention provides a stretchable sheet capable of effectively improving the detachment resistance, flexibility, and aesthetic appearance of the linear elastic body by forming portions where the joining strength between sheets and the fixing strength of the linear elastic body to the sheet are different from each other. manufacturing method.

Hereinafter, the manufacturing method of the stretchable sheet of this invention is demonstrated based on the preferable embodiment, referring drawings.

As shown in FIG. 1 , the stretchable sheet produced in the first embodiment is used for the waist panel 3 of the disposable diaper 1 of an unfolded type, for example. Therefore, first, the unfolded disposable diaper 1 using the elastic sheet manufactured by 1st Embodiment for the waist panel 3 is demonstrated.

As shown in FIG. 1 , the diaper 1 includes: an abdominal portion A positioned on the abdomen side of the wearer when worn, a back portion B positioned on the back side, and a crotch portion positioned between the abdomen portion A and the back portion B. The absorbent main body 2 of C; a pair of left and right waist flaps 3, 3 connected to the left and right outer sides of the back side part B. As shown in FIG. 1 , the diaper 1 has a pair of left and right flap members 4 , 4 provided continuously outside the left and right sides of the abdominal portion A. As shown in FIG. In the state where the diaper 1 is spread out planarly as shown in FIG. 1, the absorbent main body 2 is rectangular, the flap member 4 is trapezoidal, and the long side (lower bottom) side of the trapezoidal flap member 4 is bonded by hot-melt bonding. The absorbent main body 2 is fixed to the absorbent main body 2 by known joining means such as an adhesive such as an adhesive or thermal welding. In addition, the direction shown by symbol X in the figure is the width direction of the diaper 1 (absorbent body 2), the direction shown by symbol Y is the longitudinal direction of the diaper 1 (absorbent body), and both directions X and Y are perpendicular to each other.

As shown in FIG. 1, the absorbent main body 2 has: a liquid-permeable front sheet 21; a liquid-impermeable or water-repellent back sheet 22; Liquid retentive absorbent body 23 . The front sheet 21 forms the skin facing surface of the diaper 1 (absorbent main body 2), and the back sheet 22 forms the non-skin facing surface of the diaper 1 (absorbent main body 2). The front sheet 21 and the back sheet 22 each have a rectangular shape in plan view larger than the external dimensions of the absorber 23, extend outward from the peripheral portion of the absorber 23, and directly or via other components at their extensions. join each other. In addition, the skin-facing surface is the surface facing the wearer's skin side of the disposable diaper or other components when worn, and the non-skin-facing surface is the opposite side of the disposable diaper or other components facing the wearer's skin side when worn. side face.

As shown in FIG. 1 , on the left and right sides along the longitudinal direction Y of the absorbent main body 2 , a pair of three-dimensional guard forming sheets 24 and 24 are arranged substantially over the entire length of the longitudinal direction Y of the absorbent main body 2 . . In each three-dimensional guard forming sheet 24, one side edge (outer edge) along the longitudinal direction Y is fixed to the absorbent main body 2 (front sheet 21), and the other side edge (inner edge) It becomes a free edge part without being fixed to the absorptive main body 2, and one or more linear elastic members 25 are fixed to this other side edge part in the state extended in the longitudinal direction Y. Utilize this structure, a pair of sheet material 24,24 for three-dimensional guard formation, when diaper 1 is worn, the above-mentioned other side edge part in crotch part C is separated from surface sheet material 21 due to the contraction force of elastic member 25, Thus a pair of three-dimensional guards are formed. In addition, in the parts (legs) arranged around the wearer's thighs on the left and right sides of the absorbent main body 2 along the longitudinal direction Y, linear elastics for forming leg gathers are arranged in an extended state. The member 26 forms a pair of leg gathers due to the contraction of the elastic member 26 when the diaper 1 is worn, and fits well around the thighs.

As shown in Figure 1, a pair of waist panels 3 and 3 are stretchable sheets with a plurality of linear elastic bodies 7 bonded and fixed between two sheets 5 and 6 respectively, as shown in Fig. In the planar unfolded state shown in 1, it has a rectangular shape. The plurality of linear elastic bodies 7 in each waist panel 3 are arranged at predetermined intervals in the longitudinal direction Y, and are respectively fixed between the sheets 5 and 6 in a state stretched in the width direction X.

The waist panel 3 has: an outer side portion 3A to which a buckle belt 8 is fixed by known joining means such as hot-melt adhesive or welding; The portion 3C has a stretchable portion 3B stretchable in the width direction X between the two side portions 3A, 3C. The waist panel 3 is fixed to the absorbent main body 2 (specifically, for example, between the three-dimensional enclosure forming sheet 24 and the back sheet 22) at its inner side portion 3C by known joining means such as hot-melt adhesives and welding. between).

As shown in FIG. 1 , the waist panel 3 has a plurality of central joints 10 at the center in the width direction (X direction), and has a pair of end joints 9, 9 on both sides of the center in the width direction. The end joints 9 are formed in the shape of a band having a predetermined width on each of the outer side 3A and the inner side 3C of the waist panel 3 , and the central joint 10 is formed in a plurality of straight lines in the elastic part 3B. .

The end joints 9 and the central joint 10 are the parts where the sheets 5, 6 are joined by an adhesive, preferably a hot-melt adhesive, respectively. In the waist panel 3 manufactured in this embodiment, as shown in FIG. 1 As shown, it is continuous over the entire length of the longitudinal direction Y of the sheets 5, 6 (waist panel 3).

In addition, the plurality of linear elastic bodies 7 are arranged from the end joint 9 of the outer side 3A to the end joint 9 of the inner side 3C, and have a pair of end joints 9, 9 and a gap between them. The portion where each of the central joints of the plurality of central joints 10 overlaps. Further, the linear elastic body 7 is fixed in a state of being sandwiched between the two sheets 5 , 6 with an adhesive at a portion overlapping the end joint portion 9 and the central joint portion 10 . In other words, each of the linear elastic bodies 7 is fixed between the sheets 5, 6 with an adhesive at the portion overlapping the linear elastic body 7 in each of the end joints 9 and the central joint 10, The parts of the part joining parts 9 and the center joining parts 10 that do not overlap with the linear elastic body 7 are directly joined to each other of the sheets 5 and 6 with an adhesive. In the end joint portion 9 and the central joint portion 10, the linear elastic body 7 and one or both of the two sheets 5, 6 sandwiching it are preferably joined by an adhesive.

In addition, in the waist panel 3 manufactured by the first embodiment, as shown in FIG. for wide. In addition, in FIG. 1, the end joint part 9 and the center joint part 10 are shown so that they may be clearly seen from the outside for easy description, However, Actually, it is not limited to this case.

The end joints 9 and the central joint 10 of the waist panel 3 are formed at a predetermined interval in the width direction X, and are joined between adjacent end joints 9 and central joints 10 and adjacent central joints. Between the parts 10 is a non-adhesive region in which no adhesive is placed between the sheets 5 and 6 . In these non-adhesive regions, the linear elastic body 7 is in an unfixed state with respect to the sheets 5 and 6 .

In the waist panel 3 unfolded in a planar shape, the linear elastic body 7 is stretched in the elastic portion 3B, and is positioned outside the end joint portion 9 in the outer side portion 3A (the direction in which the buckle belt 8 protrudes). ) and the inner side (the inner side in the width direction of the diaper) of the end joint portion 9 in the inner side portion 3C are in a relaxed state (non-extended state). In addition, the end portions in the longitudinal direction of the linear elastic bodies 7 or the vicinity thereof are fixed in an extended state in the end joint portions 9 .

As the adhesive used for joining the sheets 5, 6 (or forming the end joints and the central joint), any adhesive used to bond the parts between the stretchable sheets (waist panels) The adhesive used for indirect bonding can be used without any limitation, for example, amorphous polyolefin, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylate copolymer (EEA), styrene- Butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene/butylene-styrene block copolymer (SEBS), Thermoplastic polymers such as styrene-ethylene/propylene-styrene block copolymer (SEPS) and their mixtures, etc. The above-mentioned adhesive is preferably a hot-melt type (hot-melt adhesive).

The forming material of each part of the diaper 1 is demonstrated.

As the top sheet 21 and the back sheet 22, various materials conventionally used in this technical field, etc. can be used. As the surface sheet 21, various liquid-permeable sheets, such as a nonwoven fabric and an apertured film, can be used. As the back sheet 22, various liquids such as a non-moisture-permeable resin film, a moisture-permeable resin film having micropores, non-woven fabrics such as water-repellent non-woven fabrics, and laminates of these and other sheets can be used. impermeable or water-repellent material. As the absorber 23, fiber aggregates such as pulp fibers or non-woven fabrics or absorbent cores in which particles of water-absorbing polymers are held can be used, and bags made of water-permeable tissue paper or non-woven fabrics can be used. The core material covers the absorbent core. As the three-dimensional enclosure forming sheet 24 constituting the three-dimensional enclosure, stretchable films, nonwoven fabrics, woven fabrics, or laminated sheets thereof can be used. In addition, a material (described later) that can be used as the sheets 5 and 6 constituting the waist panel 3 can be used as the panel member 4 .

As the sheets 5 and 6 constituting the waist panel 3, various manufacturing methods such as air-through non-woven fabric, hot-rolled non-woven fabric, spunlace non-woven fabric, spun-bonded non-woven fabric, and melt-blown non-woven fabric can be used, for example. Non-woven fabrics, woven fabrics, woven fabrics, paper, resin films, etc., and sheets formed by laminating two or more of them. In addition, as the fastening tape 8 , for example, one surface of a tape base material such as non-woven fabric is bonded with a mechanically fastened hook member by thermal welding, an adhesive, or the like, or the like can be used.

As the linear elastic body 7, the elastic member 25 constituting the three-dimensional shield, and the elastic member 26 for forming the leg gathers, materials including natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene, etc. can be used. - Linear stretchable materials such as polybutadiene copolymers, polyethylene-α-olefin copolymers such as ethyl acrylate-ethylene, etc. The linear elastic body and elastic member of the present invention include thin strip-shaped materials having circular, square, elliptical, or rectangular cross-sections, and multifilament-shaped materials. The width (or diameter) of the linear elastic body of the present invention is, for example, not less than 0.1 mm and not more than 3 mm, preferably not more than 1 mm. In addition, the width (or diameter) of the elastic member is, for example, 0.1 mm to 5 mm, preferably 0.1 mm to 3 mm.

Next, a preferred embodiment of the method for manufacturing the stretch sheet of the present invention will be described with reference to the drawings, taking the case of manufacturing the waist panel 3 (stretch sheet) of the above-mentioned diaper 1 as an example. In Fig. 2 and Fig. 3, a manufacturing apparatus 11 applied to the method of manufacturing the waist panel 3 (stretchable sheet) of the first embodiment is schematically shown.

As shown in Fig. 2 and Fig. 3, the manufacturing device 11 is a device for continuously manufacturing a belt-shaped stretchable sheet 3' as a blank of the waist panel 3 (stretchable sheet), and includes: the conveying mechanism 16 ; and the rotating arm (elastic body winding mechanism) 14 for elastic body winding that continuously winds the linear elastic body 7 in an extended state on the conveying mechanism 16 . The conveying mechanism 16 includes a pair of separated in the direction (CD, Crossmachine Direction, the direction perpendicular to the machine direction of the machine) perpendicular to the conveying direction (MD, Machine Direction, machine direction) of the belt-shaped sheet 50, 60. Conveyor belts 12, 13. The linear elastic body 7 is wound between the pair of conveyor belts 12 and 13 in a stretched state by the rotating arm 14 in a direction intersecting with the conveyance direction Y. As shown in FIG. The belt-shaped sheets 50 and 60 are blanks of the sheets 5 and 6 constituting the waist panel 3 .

In FIGS. 2 and 3 , the direction denoted by symbol y (y direction) represents the conveyance direction (MD) of the belt-shaped sheets 50, 60, and the direction represented by symbol x (direction x) represents CD. The y direction (MD) coincides with the conveyance direction of the linear elastic body 7 wound on the conveyance mechanism 16 (conveyor belts 12, 13) and the conveyance direction of the elastic sheet 3', and furthermore, is also consistent with the conveyance direction of the diaper 1 (absorbent main body). 2) The longitudinal direction Y (refer to FIG. 1) matches. Moreover, x direction (CD) agrees with the width direction of the belt-shaped sheet|seat 50,60, and also agrees with the width direction X (refer FIG. 1) of the diaper 1 (absorbent main body 2). In addition, the direction (z direction) shown by the code|symbol z in FIG.

Further illustrate manufacturing device 11, manufacturing device 11 comprises: continuously send out linear elastic body 7, the elastic body supply mechanism 15 that linear elastic body 7 is introduced into rotating arm (elastic body winding mechanism) 14 with stretched state; 14 The coiled linear elastic body 7 is conveyed to the conveying mechanism 16 between the pair of strip-shaped sheets 50, 60; there is a coating mechanism for applying an adhesive such as hot-melt adhesive to the strip-shaped sheet 50 172 of the coating device 17; use a pair of pinch rollers 181, 182 to fix the linear elastic body 7 in an elongated state between a pair of strip-shaped sheets 50, 60; The linear elastic body 7 extending outward from both ends of the sheet 50, 60 along the conveyance direction (y direction) releases the coil of the linear elastic body 7 relative to the conveyance mechanism 16 (conveyor belts 12, 13). The cutting mechanism 19 in the winding state.

As shown in FIG. 3 , the conveying belt 12 of the conveying mechanism 16 is an endless (endless) rotating belt, and includes an upper layer belt 12 a and a lower layer belt 12 b in upper and lower layers. The upper layer belt 12a is stretched between two pulleys arranged in the z direction in the direction of the rotation axis, one of which is the pulley 122 arranged on the upstream side of the integrated mechanism 18, and the other pulley is arranged on the downstream side of the integrated mechanism 18. The pulley 121. In addition, the lower layer belt 12b is spanned between two other pulleys arranged in the z direction in the rotation axis direction, one of which is the pulley 125 arranged on the upstream side of the integrated mechanism 18 and located below the pulley 122, and the other pulley is The pulley 124 is arranged on the downstream side of the integrated mechanism 18 and is positioned below the above-mentioned pulley 121 on which the upper belt 12a is stretched. Each pulley is arrange|positioned outside the end part along the conveyance direction (y direction) of the belt-shaped sheet|seat 50,60. To the pulleys 121 and 124 on the downstream side, a servomotor (not shown) is connected to the driving part thereof, and the respective rotation speeds of the upper belt 12a and the lower belt 12b can be changed by the servomotor.

The conveyer belt 13 of the conveyance mechanism 16 is also an endless rotating belt like the conveyer belt 12, and as shown in FIG. The conveyor belt 13 has the same configuration as the conveyor belt 12 , and the two belts 13 a, 13 b are stretched between two pulleys 132 , 131 or pulleys 135 , 134 disposed upstream and downstream across the integrated mechanism 18 . The upper belt 13a and the lower belt 13b have the same structure as the upper and lower belts 12a, 12b of the conveyor belt 12, respectively, and can be driven and changed in rotational speed.

The conveyor belt 12 (upper layer belt 12a, lower layer belt 12b) and the conveyor belt 13 (upper layer belt 13a, lower layer belt 13b) are stretched on the above-mentioned pulleys respectively, and thus from the pair of pinch rollers 181, 182 (integrated mechanism 18) The upstream side is arranged to the downstream side. As shown in FIG. 2 , the two belts 12 , 13 are located outside the ends of the belt-shaped sheets 50 , 60 along the conveyance direction (y direction), and are arranged bilaterally symmetrically with each other. The two belts 12 , 13 rotate such that their respective outer peripheral sides extend in the y-direction. Both belts 12, 13 are preferably timing belts. The rotational speed of the two belts 12, 13, that is, the rotational speed of the servomotor (not shown) of the drive unit of the pulley (not shown) disposed on the downstream side is controlled by a control unit (not shown) included in the control device 11. .

As shown in FIGS. 2 and 3 , the rotating arm (elastic body winding mechanism) 14 includes: an arm portion 141 having a shaft portion 142, a rotating portion 143, and a connecting portion 144; A drive mechanism 147 for rotating the arm portion 141 . The connecting portion 144 is angularly coupled to the shaft portion 142 and the rotation portion 143 , and the rotation portion 143 and the shaft portion 142 are substantially parallel. As shown in FIG. 3 , the shaft portion 142 has an inlet 145 for the linear elastic body 7 at one end thereof, and the rotating portion 143 has an outlet 146 for the linear elastic body 7 at one end thereof. The elastic body 7 is smoothly led out from the lead-out port 146 through the shaft part 142 , the connection part 144 and the rotation part 143 . Various well-known members (driven rollers, low-friction members, etc.) capable of reducing friction with the linear elastic body 7 can be disposed on the bent portion of the arm portion 141, the outlet 146, and the like.

The rotation unit 143 is arranged such that the outlet 146 is located on the downstream side of the upstream ends of the conveyor belt 12 (upper belt 12a, lower belt 12b) and the conveyor belt 13 (upper belt 13a, lower belt 13b). As shown in FIG. 3 , a servomotor 148 is installed on the driving part (shaft part 142 ) of the rotating arm 14 (elastic body winding mechanism). By the rotation of the servomotor 148, the rotating part 143 rotates between the outer peripheries of the two belts 12 and 13. rotate. The diameter of the trajectory on which the outlet 146 rotates is larger than the distance between the outer surfaces of the pair of conveyor belts 12 , 13 . With such a rotating arm 14 , the taken-in linear elastic body 7 can be continuously wound around the upstream ends of the two belts 12 and 13 and wound around the respective outer peripheral sides. The rotational speed of the rotating arm 14 , that is, the rotational speed of the servo motor 148 is controlled by a control unit (not shown) included in the manufacturing apparatus 11 .

As shown in FIG. 3 , the elastic body supply mechanism 15 includes: a roller body 70 that is wound with a linear elastic body 7; a tension mechanism 151 that uses a brake to apply tension to the linear elastic body 7 at the downstream side of the roller body 70; On the downstream side of the mechanism 151, there is an output roller 152 for outputting the linear elastic body 7 from the roller body 70; on the downstream side of the output roller 152, there is a tensiometer 153 for measuring tension. The direction of the rotation axis of the output roller 152 is arranged in the x direction (direction perpendicular to the conveyance direction of the sheet). A servo motor (not shown) is attached to the driving portion of the output roller 152 . The delivery roller 152 is used by winding the linear elastic body 7 twice around its outer periphery. Based on the detection output of the tension measuring device 153, the control unit (not shown) included in the manufacturing device 11 can control the rotation speed of the servo motor (not shown), that is, the rotation speed of the output roller 152, so that the thread can be drawn with a predetermined tension. The elastic body 7 is wound out from the roller body 70 .

As shown in FIG. 3 , the elastic body supply mechanism 15 has a feed roller 156 located on the downstream side of the output roller 152 . The feed roller 156 is arranged between the rotating arm (elastic body winding mechanism) 14 and the delivery roller 152, and its rotation axis direction is arranged in the x direction. The feed roller 156 has a servo motor (not shown) attached to its driving portion. The rotational speed of the servo motor not shown, that is, the rotational speed of the feed roller 156 is controlled by a control unit (not shown) included in the manufacturing apparatus 11 .

As shown in FIG. 2 and FIG. 4( a ), the application device 17 has an application mechanism 172 for applying an adhesive to the belt-shaped sheet 50 . The adhesive is supplied to the application mechanism 172 through a predetermined supply path from an adhesive storage box (not shown). As shown in FIG. 4(a), the coating mechanism 172 is formed with a discharge port for discharging the adhesive 10' (adhesive for forming the central joint) for forming the central joint 10 on the stretchable sheet 3'. E; and a discharge port F for discharging the adhesive 9' (adhesive for forming the end joint) for forming the end joint 9 on the stretchable sheet 3'. The discharge port E is provided at a position facing the widthwise center of the belt-shaped sheet 50 , and the discharge port F is provided at a position opposite to both ends of the belt-shaped sheet 50 on both sides of the widthwise center.

In the first embodiment, the discharge port E and the discharge port F are connected via the same common storage box (not shown) and the supply path 173, and the same type of adhesive is discharged from the two discharge ports E and F, and applied In the strip sheet 50.

A known adhesive applying mechanism can be used as the applying mechanism 172 . It may be a contact type coating mechanism in which the coating head of the coating mechanism is in contact with the surface to be coated, or may be a non-contact type coating mechanism in which the coating head of the coating mechanism does not contact the surface to be coated. As a contact type coating mechanism, a slit coater, a gravure coater, a rotary screen coater, etc. are mentioned, for example. As a non-contact coating mechanism, for example, a spray coater, a bead coater, a curtain coater, etc. can be used. In addition, a metal pipe, a flexible pipe, or the like can be used as the supply path.

As shown in FIG. 2 , the integrated mechanism 18 has a pair of pinch rollers 181 , 182 . A pair of pinch rollers 181, 182 is located between the inner peripheral side of the conveyor belt 12 (upper belt 12a, lower belt 12b) and the inner peripheral side of the conveyor belt 13 (upper belt 13a, lower belt 13b).

In the first embodiment, as shown in FIG. 2 and FIG. 4( a ), as a pair of pinch rollers 181 and 182, one of the pinch rollers 181 has a relatively small diameter at the center in the axial direction. Part M, and has relatively large diameter large-diameter parts S, S at both ends in the axial length direction. The other pinch roller 182 has a constant diameter over the entire width of the belt-shaped sheets 50 and 60 .

The small-diameter portion M of the nip roller 181, as shown in FIG. The large-diameter portions S and S of the pinch roller 181 pressurize the portion of the strip-shaped sheets 50 and 60 between which the adhesives 9 ′ and 9 ′ for forming end joints are inserted.

A cylindrical roller made of metal or a cylindrical roller made of low-hardness silicon can be used as the pinch roller 182 . As the pinch roller 181 , a member having the same structure as the pinch roller 182 is used except that it is formed into a cylindrical shape with a step on its peripheral surface.

The pair of pinch rollers 181 and 182 has a servo motor (not shown) attached to either drive unit, and the rotation speed is controlled by a control unit (not shown) included in the manufacturing apparatus 11 . A gear for drive transmission is attached to each rotating shaft of a pair of pinch roller 181,182. The rotation speed of a servo motor not shown, that is, the rotation speed of one of the pair of pinch rollers 181 and 182 can be controlled based on the production speed of the stretchable sheet by a driving mechanism not shown. At this time, the driving force is also transmitted to the other of the pair of pinch rollers 181 and 182 by meshing of the gears for drive transmission, and the pair of pinch rollers 181 and 182 can be rotated. The bearing parts of the pair of pinch rollers 181, 182 are, in order to securely fix the stretched linear elastic body 7 between the pair of strip-shaped sheets 50, 60, using forces such as oil pressure, air pressure, and springs, Pressurize the respective bearing sections.

As shown in FIG. 2 , the cutting mechanism 19 has a cutter 190 having a sharp cutting edge at a portion in contact with the conveyed linear elastic body 7 . The cutter 190 is arranged at a position in contact with the linear elastic body 7 by a support not shown, and the linear elastic body 7 is conveyed by the conveyer belts 12 and 13 and pressed against the cutter 190 to be cut. The position of the cutting mechanism 19 is slightly downstream of the part where the linear elastic body 7 and the strip-shaped sheets 50 and 60 are integrated by the pair of pinch rollers 181 and 182 . As the cutting mechanism 19, various known members capable of cutting the linear elastic body 7 can be used without particular limitation. As the roll cutter, a cutting mechanism capable of cutting the linear elastic body 7 by laser light, heat, or the like may be used.

In the first embodiment, the waist panel 3 and the stretchable sheet 3' which is a continuous body of the waist panel 3 are manufactured as follows using the manufacturing apparatus 11 having such a structure.

First, as shown in FIG. 2 and FIG. 3 , the linear elastic body 7 is continuously delivered, and the delivered linear elastic body 7 is introduced into the rotating arm 14 as an elastic body winding mechanism in a stretched state (supplying process). As described below in detail, the linear elastic body 7 is continuously delivered from the winding roll 70 on which the linear elastic body 7 is wound, using the delivery roller 152 . At the time of output, based on the detection output of the tension of the linear elastic body 7 obtained by the tension measuring device 153, the rotation speed of the unwinding roller 152 is adjusted by the control unit (not shown) included in the manufacturing device 11, and the tension is adjusted at a predetermined tension. The linear elastic body 7 is output from the winding roll 70 . Then, the linear elastic body 7 is introduced into the rotating arm 14. When introducing, the speed of the linear elastic body 7 introduced into the rotating arm 14 (elastic body winding mechanism) is adjusted to a constant speed by using the above-mentioned feed roller 156. import. The introduction speed is set to a speed corresponding to the winding speed around the conveying mechanism 16 (a pair of conveying belts 12 and 13).

As shown in FIG. 2, after the above-mentioned supplying process, the linear elastic body 7 is stretched in a direction intersecting the conveying direction (y direction) of the strip-shaped sheets 50, 60 by using the rotating arm 14 (elastic body winding mechanism). The long state is wound on the conveying mechanism 16 (a pair of conveying belts 12, 13), and the wound linear elastic body 7 is conveyed between the pair of belt-shaped sheets 50, 60 by the conveying mechanism 16 (transporting step). Described in detail as follows, the linear elastic body 7 supplied into the rotating arm 14 in an extended state is introduced into the arm part 141 from the introduction port 145 as shown in FIG. , derived from the export port 146. The linear elastic body 7 led out from the lead-out port 146 is led out while the rotating arm 14 rotates, thereby being wound around the outer peripheral side of the upstream end of the conveyor belt 12 (upper layer belt 12a, lower layer belt 12b) and the conveyor belt. 13 (the upper layer belt 13a, the lower layer belt 13b) on the outer peripheral side of the end on the upstream side. Here, as the conveyor belts 12 and 13 rotate and advance, the linear elastic body 7 is wound continuously and spirally around the respective outer peripheral sides of the two belts 12 and 13 . The linear elastic body 7 wound around the conveyance mechanism 16 in such a stretched state is continuously conveyed between a pair of belt-shaped sheets 50 and 60 on the downstream side.

Here, the linear elastic body 7 immediately after being wound on the conveying mechanism 16 (a pair of conveying belts 12, 13) is stretched in a direction intersecting the y direction (the conveying direction of the sheet) to form its wound length, but It does not elongate in the direction (x direction) orthogonal to the y direction. In order to correct the elongation direction of the linear elastic body 7 immediately after being wound to the x direction, for example, when the linear elastic body 7 is wound as shown in FIG. The rotation speed is slower than the rotation speed of the lower belt 12b. In the conveyor belt 13, the rotation speed of the lower belt 13b may be lower than the rotation speed of the upper belt 13a. By appropriately adjusting the rotation speed of the conveyor belts 12 and 13 in this way, the inclination (elongation direction) of the linear elastic body 7 being conveyed in the y direction can be gradually changed, and the linear elastic body 7 can be conveyed to a pair of belt-shaped Before between the sheets 50, 60 (between the pair of nip rollers 181, 182), the inclination of the linear elastic body 7 can be corrected from a direction different from the x direction immediately after winding to the x direction.

As shown in FIG. 2 , before the tape-shaped sheets 50 and 60 are coated with an adhesive, the two sides (x direction) along the conveying direction (y direction) are folded by a folder (not shown) or the like. both ends) to the outer surface side (opposite side to the opposite surface of the other band-shaped sheet material that merged). Then, as shown in FIG. 4( a), use the coating device 17 to coat the center part of the widthwise center of one surface of the belt-shaped sheet 50 (the surface opposite to the merged other belt-shaped sheet 60 ). Adhesives 10 ′ for forming joints, and adhesives 9 ′ for forming end joints are applied to both sides of the central portion in the width direction on the surface of the belt-shaped sheet 50 .

The adhesive 10' is applied in such a manner that a plurality of thinner linear adhesive application portions are continuously formed linearly along the conveying direction of the sheet 50, respectively. In addition, the adhesive 9' is applied in such a manner that two belt-shaped adhesive application portions are continuously formed linearly along the conveyance direction of the sheet 50, respectively.

Then, the pair of strip-shaped sheets 50 and 60 after the adhesive coating process are merged with the linear elastic body 7 conveyed by the conveying mechanism 16, and the pair of strip-shaped sheets sandwiching the linear elastic body 7 are combined. The materials 50 and 60 are integrally pressed to obtain a composite sheet 30A (stretchable sheet 3') (integration process). Described in detail as follows, between the pair of pinch rollers 181, 182, the linear elastic body 7 in an extended state continuously wound on the conveying mechanism 16 (a pair of conveying belts 12, 13) is supplied, and the pair of strip-shaped sheets The materials 50 and 60 are supplied so as to face the linear elastic body 7 being conveyed, and these are merged. The two sheets 50 and 60 are merged so that the linear elastic body 7 is fixed therebetween, and the pair of pinch rollers 181 are introduced in a state where the linear elastic body 7 is pinched and fixed between the two sheets 50 and 60 , 182 are pressurized.

At this time, between the large-diameter portions S and S of the pinch roller 181 and the pinch roller 182 , there is a portion between the strip-shaped sheets 50 and 60 where the adhesive 9 ′ for the end joint is present. is pressed, and between the small-diameter portion M of the pinch roller 181 and the pinch roller 182, the portion of the belt-shaped sheet 50, 60 that has the adhesive 10' for the central joint between the two is covered. Pressurize.

Thus, a composite sheet 30A joined between the strip-shaped sheets 50 and 60 by the adhesive 9' and the adhesive 10' is obtained.

Next, the elongated linear elastic bodies 7 extending outward from the composite sheet 30A in the conveyance direction (y direction) are cut, and the linear elastic bodies 7 are shrunk. There are cut ends generated by cutting the linear elastic body 7 on one side and the other side along the y direction of the composite sheet 30A (cutting step). Described in detail as follows, from the composite sheet 30A (a pair of belt-shaped sheets 50, 60) along the conveying direction ( y direction) (both side edges of the composite sheet 30A in the x direction) extend, and are cut by the cutter 190 described above. By cutting the linear elastic body 7, the coiled state of the linear elastic body 7 with respect to the pair of conveyor belts 12, 13 (transport mechanism 16) is released, and the strip-shaped elastic sheet 3' is formed as a strip-shaped sheet. A state is obtained in which both side portions in the y direction (both ends in the x direction) of the materials 50 , 60 are folded back to the outer surface side, respectively. After the cutting of the linear elastic body 7, using a folder not shown, etc., make the belt-shaped sheets 50, 60 constituting the belt-shaped stretchable sheet 3' into a state that has not been folded back, thereby obtaining Fig. 4 ( The belt-shaped elastic sheet 3' shown in b).

The belt-shaped stretchable sheet 3' obtained in this way is cut into a predetermined unit length (product length) by a known cutting mechanism not shown, thereby obtaining the desired waist panel 3 (stretchable sheet).

In the first embodiment, as described above, between the large-diameter portions S, S of the pinch roller 181 and the pinch roller 182 , there is an end joint portion between the strip-shaped sheets 50 , 60 . The portion of the adhesive 9' used is pressurized, and between the small-diameter portion M of the pinch roll 181 and the pinch roll 182, the central joint between the strip-shaped sheets 50, 60 is inserted between the two. Therefore, when the pressure is applied between the pair of pinch rollers 181 and 182, the adhesive 9' for the end joint is generated in the large-diameter portion S. The portion where the gap (space between the peripheral surfaces) between the peripheral surface and the peripheral surface of the pinch roller 182 is relatively narrow is relatively strongly pressed, and the adhesive 10 ′ for forming the central joint portion is formed on the small diameter. The portion where the gap (space between the peripheral surfaces) between the peripheral surface of the portion M and the peripheral surface of the pinch roller 182 is relatively large is relatively weakly pressed. That is, the bonding conditions in the integration step between a pair of strip-shaped sheets are different for the adhesive 10' for forming the central joint and the adhesive 9' for forming the end joint. Specifically, the pressure applied to the adhesive 9' for the end joint is stronger than the pressure applied to the adhesive 10' for forming the central joint.

Therefore, in the composite sheet 30A and the stretchable sheet 3', the end joints 9, 9 that are firmly joined between the strip-shaped sheets 50, 60 via the adhesive 9' for forming the end joints are formed, In these end joints 9 , 9 , the linear elastic body 7 is fixed relatively more firmly than the central joint 10 , and the detachment of the linear elastic body 7 can be prevented. On the other hand, between the end joints 9, 9 in the composite sheet 30A and the stretchable sheet 3', an adhesive 10' for forming a central joint between the belt-shaped sheets 50, 60 is formed. bonded central joint 10, but the adhesive 10' forming the central joint 10 is pressurized weaker than the adhesive 9' forming the end joint 9, thus preventing the adhesive 10' from It is crushed and spreads in the width direction of the two sheets 50,60. Therefore, in the composite sheet 30A and the stretchable sheet 3', the region of the central joint portion 10 is excellent in air permeability and also excellent in flexibility. In this way, it is possible to efficiently manufacture the stretchable sheet 3' which is less prone to detachment of the linear elastic body 7 from the end joints 9, 9 and has excellent air permeability, flexibility, and stretchability between the end joints 9, 9. and waist flap3.

In addition, since the adhesive 10 ′ of the central joint portion 10 is relatively weakly pressurized compared with the end joint portion 9 , in the central joint portion 10 , between the strip-shaped sheets 50 , 60 and the end portions The joining part 9 is relatively weakly joined, and the fixation of the linear elastic body 7 is also relatively weak, but the central joint part 10 is formed between the pair of end joint parts 9, so the central joint part 10 does not The problems of peeling between the sheets 50 and 60 and detachment of the linear elastic body 7 arise.

In addition, the width W1 (see FIG. 1 ) of the end joint portion 9 is preferably 3 mm or more, more preferably 5 mm or more, and is preferably 20 mm or less, more preferably 10 mm or less, and preferably 3 mm or more and 20 mm or less, more preferably 5 mm or more and 10 mm or less.

On the other hand, the width W2 (refer to FIG. 1 ) of the central joint portion 10 is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 5 mm or less, more preferably 1.5 mm or less, and preferably 0.1 mm or more and 5 mm or less, more preferably 0.5 mm or more and 1.5 mm or less. From the same viewpoint, the distance W3 (see FIG. 1 ) between the adjacent end joints 9 and the central joint 10 and the distance W4 (see FIG. 1 ) between the two adjacent central joints 10 and 10 are preferably 1 mm or more, more preferably 3 mm or more, preferably 10 mm or less, more preferably 7 mm or less, more preferably 1 mm or more and 10 mm or less, more preferably 3 mm or more and 7 mm or less.

In addition, the interval W5 (refer to FIG. 1 ) between two adjacent linear elastic bodies 7 and 7 in the Y direction is preferably 2 mm or more, more preferably 4 mm or more, and is preferably 12 mm or less, more preferably 10 mm or less. , In addition, it is preferably not less than 2 mm and not more than 12 mm, more preferably not less than 4 mm and not more than 10 mm.

As described in the first embodiment, one roll 181 is provided with large-diameter parts S, S and small-diameter part M, and the part for pressurizing the adhesive 10' for forming the central joint part and the part for forming the end joint part In the part where the adhesive 9' is pressurized, when the pressure applied to the pair of strip-shaped sheets 50, 60 is different, the difference in diameter of the large-diameter portion S, S and the small-diameter portion M can be determined according to the diameter of the strip-shaped sheet. The thicknesses of 50 and 60 are appropriately determined, but from the viewpoint of providing a sufficient pressure difference between the large-diameter parts S and S and the small-diameter part M, the radius Rs of the large-diameter parts S and S and the radius of the small-diameter part M The difference in radius Rm (Rs−Rm) and the difference in the gap between the rollers in the large-diameter parts S, S and the small-diameter part M are preferably, for example, 0.01 mm or more, more preferably 0.01 mm or more and 1 mm or less.

The diaper 1 which has the waist panel 3 can be manufactured by the following method, for example.

That is, after intermittently fixing the fastening tape 8 to the stretchable sheet 3' obtained as described above, it is cut into the size of a single diaper, or the stretchable sheet 3' is cut into a size of a single diaper The buckle belt 8 is then fastened, thereby obtaining the waist panel 3 shown in FIG. 1 . In the manufacture of the waist panel 3, it is preferable to obtain a pair of bilaterally symmetrical waist panels 3, 3 in which the attaching positions of the buckle belt 8 are different from each other from two stretchable sheets 3'.

In addition to the manufacture of the waist panels 3 and 3, while continuously conveying the continuum of the front sheet 21, the continuous body of the three-dimensional enclosure forming sheet 24 is respectively joined on both sides of the conveying direction to obtain a composite continuous body. Sheet.

Then, while continuously conveying the composite continuous sheet, the left and right pair of waist flaps 3, 3 obtained from the two stretchable sheets 3' are placed on both sides in the direction of conveyance of the composite continuous sheet. The setting intervals are sequentially fixed intermittently. Then, the continuous body of the back sheet 22 is merged and integrated so as to sandwich the absorbers 23, 23... between both. In this integration, a plurality of elastic members 26 and flap members 4 in an extended state are arranged on both sides of the absorber 23, and these are also fixed to the continuous body of the three-dimensional guard forming sheet 24 and the back sheet 22. between the continuum.

In this way, the continuous body of the diaper 1 which fixed the waist panel 3 of many pairs to the both sides of the continuous body of the absorptive main body 2 is manufactured. Here, the conveying direction (y direction) of the continuum of the absorbent main body 2 is the same direction as the conveying direction (y direction) when the waist panel 3 (stretchable sheet) is manufactured, and it is not necessary to separate the waist panel 3 (stretchable sheet) Sexual sheet) flipped 90°.

Then, a plurality of diapers 1 can be manufactured sequentially by cutting the continuous body of the diaper 1 into the size of a single diaper 1 by a known cutting mechanism (not shown).

Next, another embodiment of the manufacturing method of the stretchable sheet of this invention is demonstrated. Regarding other embodiments described later, points different from those of the above-mentioned first embodiment will be mainly described, and descriptions of the same points will be omitted by assigning the same reference numerals. Points not particularly described can be interpreted in the same manner as in the first embodiment.

As shown in FIG. 5 , in the manufacturing method according to the second embodiment of the present invention, it is used as an integrated process of integrally pressing a pair of strip-shaped sheets 50 and 60 with the linear elastic body 7 sandwiched therebetween. A pair of rollers 181, 182, at least one of the rollers 181 includes a plurality of short rollers 181s, 181m, 181s arranged in the width direction (x direction) of the pair of strip-shaped sheets 50, 60. As shown in FIG. 5, on one or both sides of a pair of strip-shaped sheets 50, 60, an adhesive 9' for forming an end joint portion similar to that of the first embodiment is applied in advance. With the adhesive 10' for forming the central joint portion similar to the central joint portion of the first embodiment, these belt-shaped sheets 50, 60 are placed in a state where the linear elastic body 7 is sandwiched between them. There is pressure between the roller 181 including a plurality of short rollers and the roller 182 that is not divided into a plurality of short rollers.

The short rollers 181s, 181s are arranged in the width direction of the strip-shaped sheets 50, 60 at positions overlapping with the application positions of the adhesive 9' for forming the end joints, and the short rollers 181m are arranged at the positions where the adhesive 9' for forming the central joints is formed. The positions where the application positions of the adhesive 10' to be used overlap. In the second embodiment, the short rollers 181s, 181m, and 181s are arranged at the same position in the conveyance direction (y direction) of the belt-shaped sheets 50, 60, and their respective peripheral surfaces face the peripheral surface of one shared roller 182.

The short rollers 181s, 181m, and 181s in the illustrated example each include: a shaft support body 181a for pivotally supporting the rotating shaft; an elevating mechanism 181b for vertically displacing the shaft support body 181a; pressure gauge 181c. Various well-known mechanisms, such as a hydraulic cylinder, an air cylinder, and a screwjack, can be used as the lifting mechanism 181b.

In the second embodiment, the short rollers 181s and 181s for pressurizing the adhesive 9' for forming the end joints and the short rollers for pressurizing the adhesive 10' for forming the central joint 181m, while maintaining and controlling the pressurization of the pair of strip-shaped sheets 50 and 60 more strongly, the linear elastic body 7 and the strip-shaped sheets 50 and 60 are integrated. For example, the gap between the short rollers 181s, 181s and the roller 182 can be set narrower than the gap between the short roller 181m and the roller 182, and the values of the respective gaps can be fixed to a certain value, and the linear elastic body 7 and the The pressing of the strip-shaped sheets 50, 60 may monitor the pressure applied by the short roller 181s and the pressure applied by the short roller 181m, and the short roller may be moved up and down so that the pressure difference between them is always maintained within a certain range. , pressurizing the linear elastic body 7 and the belt-shaped sheets 50 and 60 simultaneously. Monitoring of the pressure and maintenance of the pressure by raising and lowering the short rolls can be performed using various known automatic control devices.

Also in the second embodiment, the joining conditions between the pair of strip-shaped sheets in the integration process are set to the adhesive agent 10 ′ for forming the central joining portion and the adhesive agent 9 for forming the end joining portion. 'different.

More specifically, the pressure of pressing when joining a pair of belt-shaped sheets with an adhesive is varied. That is, according to the manufacturing method of the second embodiment, between the short rollers 181s, 181s and the nip roller 182, the adhesive 9 for the end joints of the strip-shaped sheets 50, 60 is inserted between the two. ' is pressed relatively strongly, and between the short roller 181m and the pinch roller 182, the part of the belt-shaped sheet 50, 60 in which the adhesive 10' for the central joint is inserted between the two is relatively weakly pressurized. Thereby, similar to the first embodiment, it is possible to efficiently manufacture the linear elastic body 7 that does not easily come off from the end joints 9, 9, and also has air permeability, flexibility, and stretchability between the end joints 9, 9. Excellent stretch panels 3' and waist flaps 3'.

In the manufacturing method of the third embodiment of the present invention, as shown in Fig. 6(a) and Fig. 6(b), the following device is used as the manufacturing device of the stretchable sheet 3', which includes: A pair of first rollers 183, 184 forming the end joint 9 on one side 3A of the stretchable sheet 3'; used to form an end on the other side 3C of the stretchable sheet 3' to be manufactured A pair of second rollers 185, 184 of the junction part 9; and a pair of third rollers 186, 187 for forming the central junction part 10 at the central part in the width direction of the stretchable sheet 3' manufactured, and the third roller 186 , 187 are provided at positions downstream of each of the first rollers 183 , 184 and the second rollers 185 , 184 in the conveyance direction (y direction) of the strip-shaped sheets 50 , 60 .

Then, as shown in FIG. 6( b ), an adhesive 9 ′ for forming the end joint 9 and an adhesive for forming the central joint 9 are applied to one side of the belt-shaped sheet 50 by the coating device 17 . After the adhesive 10' of 10, the belt-shaped sheet 50 and the other belt-shaped sheet 60 are joined so that the linear elastic body 7 is sandwiched between the two sheets 50 and 60 . Then, first, the portion of the strip-shaped sheet 50, 60 where the adhesive 9 ′, 9 ′ for forming the end portion is present is sandwiched between the pair of first rollers 183, 184 or the pair of second rollers 185. , 184 to pressurize. As a result, a pair of end joining portions 9, 9 are formed on both side portions 3A, 3C of the manufactured stretch sheet 3'. Next, the portion of the belt-shaped sheets 50, 60 where the adhesive 10' for forming the central joint portion is present is sandwiched between the pair of third rollers 186, 187 and pressed. Thereby, a plurality of central joining portions 10, 10 are formed in the central elastic portion 3B of the manufactured elastic sheet 3'.

Also in the third embodiment, the joining conditions between the pair of strip-shaped sheets in the integration step are set to the adhesive 10 ′ for forming the central joining portion and the adhesive 9 for forming the end joining portion. 'different.

More specifically, in the manufacturing method of the third embodiment, as shown in FIG. The adhesive 9' for use and the adhesive 10' for forming the central junction are from applying the adhesive 9' on the strip sheet 50 to applying the adhesive 9 by the first and second rollers. 'The time to apply pressure differs from the time from when the adhesive 10' is applied to the belt-shaped sheet 50 to when the pressure is applied by the third roll. Therefore, even if the hot-melt adhesive that is heated and melted at the same temperature is applied as the adhesive 9' and the adhesive 10', due to the pressure of the adhesive when sandwiched between the sheets 50 and 60, The viscosity of the adhesive varies with temperature.

In the embodiment shown in FIG. 6(a) and FIG. 6(b), the adhesive 9' for forming the end joint is applied to the adhesive 9' by the first and second rollers. The time for applying pressure is shorter than the time for applying pressure to adhesive 10 ′ between the third rollers after applying the adhesive 10 ′ for forming the central joint portion. Therefore, when the temperature, type, applied grammage, etc. when applied to the strip-shaped sheet 50 are the same, the temperature of the adhesive 9' is higher than that of the adhesive 10', that is, in a state of low viscosity. Together with the sheets 50, 60 are pressed. Therefore, compared with the central joint portion 10 between the strip-shaped sheets 50, 60 joined by the adhesive 10 ′, in the end joint 9 between the strip-shaped sheets 50, 60 joined by the adhesive 9 ′, the belt The bonding strength between the linear sheets 50, 60 and the fixing strength of the linear elastic body to the sheets 50, 60 are relatively high. In addition, when the adhesive 10' having a low temperature (that is, high viscosity) is pressed between the rolls, it is difficult to spread in the width direction of the sheet, and the reduction in air permeability and stretchability due to the adhesive 10' is difficult to occur. .

Thus, according to the third embodiment, it is possible to efficiently manufacture a stretchable sheet in which the linear elastic body 7 does not easily come off from the end joints 9, 9 and has excellent air permeability, flexibility, and stretchability between the end joints 9, 9. Material 3' and waist flap 3.

The distance (L2) from the application position P1 of the adhesive 10' to the position P3 where the adhesive 10' is pressed by the roller is the same as the distance (L2) from the application position P1 of the adhesive 9' to the position P3 where the roller is pressed. The ratio (L2/L1) of the distance (L1) at the position P2 of the agent 9' is preferably 1.1 or more, more preferably 1.2 or more, more preferably 5 or less, more preferably 2 or less, and more preferably 1.1 or more and 5 or less , more preferably 1.2 or more and 2 or less. In addition, the said distance L1, L2 is measured along the conveyance path of the belt-shaped sheet material to which each adhesive agent was applied.

In addition, in the manufacturing apparatus used in the third embodiment, as shown in FIG. Separated in the x direction, on the other hand, the other roller 184 of the first rollers 183, 184 and the other roller 184 of the second rollers 185, 184 extend substantially over the entire width of the belt-shaped sheet 50, 60. A shared tubular roll of uniform diameter. Instead of this, different rolls separated in the x direction may be used as the first roll 184 and the second roll 184 . In addition, when two rollers are provided separately in the x direction like the roller 183 and the roller 185, the two rollers may have a common rotation axis, or may have each independent rotation axis.

In the manufacturing method of the fourth embodiment of the present invention, the manufacturing apparatus of the stretchable sheet 3' shown in Fig. 7 is used. The manufacturing apparatus of the stretchable sheet 3' shown in FIG. The mechanism of a pair of pinch rollers 181', 182 with a uniform diameter in substantially the entire width range of the material 50, 60, and when the adhesive 9' for forming the end joint part is applied to the strip-shaped sheet 50 and the center A cooling mechanism for cooling the adhesive is provided between the application device 17 of the adhesive 10' for forming the junction and the portion P4 where the strip-shaped sheets 50, 60 are pressed by the pair of pinch rollers 181', 182. 20. The structure of the coating device 17 is the same as that of the coating device 17 shown in FIG. 6( a ). The cooling mechanism 20 cools only the adhesive 10' among the adhesive 9' and the adhesive 10', or cools the adhesive 10' more strongly than the adhesive 9'.

As the cooling mechanism 20, a cooling device that blows cold air to the adhesive to cool it, or a contact type chill roll (chill roll), etc. can be used, but the cooling device is more preferable in terms of simple device structure and economical device manufacturing. .

Also in the fourth embodiment, the joining conditions between the pair of strip-shaped sheets in the integration step are set to the adhesive 10 ′ for forming the central joining portion and the adhesive 9 for forming the end joining portion. 'different.

More specifically, in the manufacturing method of the fourth embodiment, as shown in FIG. After the adhesive 9 ′ and the adhesive 10 ′ for forming the central bonding portion 10 , the adhesive 10 ′ is cooled by the cooling mechanism 20 to lower the temperature of the adhesive 10 ′. On the other hand, the adhesive 9' is maintained at a temperature higher than that of the adhesive 10' without substantially cooling or cooling the adhesive to a weaker degree.

Then, in this state, the belt-shaped sheet 50 and the other belt-shaped sheet 60 are sandwiched between the two sheets 50, 60 in a state where the linear elastic body 7 is sandwiched between them. Pressurization is performed between a pair of rollers 181 ′, 182 . At this time, the adhesive 9' is pressurized together with the sheets 50, 60 at a higher temperature than the adhesive 10'. Therefore, since the side with a higher temperature has a lower viscosity than the side with a lower temperature, by using an adhesive of a type and a temperature range that can obtain a high bonding strength, it is possible to make the sheets 50 and 60 adhere to each other through the adhesive. Compared with the central joint part 10 joined by the adhesive 10', in the end joint part 9 joined by the adhesive 9' between the sheets 50 and 60, the joining strength between the sheets 50, 60 and the linear elastic body to the sheet The fixing strength of the materials 50, 60 is relatively higher. In addition, when the adhesive 10' having a relatively low temperature (that is, a high viscosity) is pressed between the rolls, it is difficult to spread in the width direction of the sheet, and the reduction in air permeability and stretchability caused by the adhesive 10' is difficult to occur.

Thus, according to the fourth embodiment, it is possible to efficiently manufacture a stretchable sheet in which the linear elastic body 7 does not easily come off from the end joints 9, 9 and has excellent air permeability, flexibility, and stretchability between the end joints 9, 9. Material 3' and waist flap 3.

The manufacturing method of the stretchable sheet of this invention is not limited to the said embodiment, It can change suitably. For example, in the form shown in FIG. 1, the planar view shape of a pair of waist panel 3,3 is rectangular, but it may be trapezoidal or a parallelogram. The shape of the waist panel 3 in plan view is preferably such that when the elastic sheet 3' is cut to obtain the pair of waist panels 3, 3, the discarded portion (the portion that cannot be used as the waist panel 3) is minimized as much as possible. .

In addition, in the above-described embodiment, after the linear elastic body 7 is wound around the pair of conveyor belts 12 and 13 in a state of being stretched in a direction not perpendicular to the y-direction (the conveying direction of the sheet) but intersecting with it, , correct its inclination (elongation direction) to a direction (x direction) perpendicular to the y direction, but it is also possible to keep the angle of being wound on the conveyor belts 12, 13 without correcting and fixing it to a pair of belt-shaped sheets. 50, 60.

In addition, as the elastic body winding mechanism, it is also possible to use a disc having an introduction portion of a linear elastic body on the rotating shaft portion, and an arm protruding from the disc to the downstream side in the y direction, and the arm surrounds the conveyor belt 12, 13 is rotated around, and the linear elastic body is wound around the conveyor belts 12 and 13, etc. In addition, as the feed roller 156 , as shown in FIG. 3 , instead of a structure in which the material (linear elastic body) is wound and conveyed, a structure in which the material is sandwiched between nip rollers and the material is conveyed can also be used.

In addition, instead of using a pair of conveyor belts, the conveyor belt disclosed in WO2005/060910 may be used as the conveyor belt. In addition, a wire support member provided with a spiral groove described in FIGS. 4 to 6 of JP-A-2002-192641 may also be used.

In addition, instead of applying the adhesive 9' for forming the end joints and the adhesive 10' for forming the central joint on one belt-shaped sheet 50, one belt-shaped sheet 50 may be coated. Adhesive 9 ′ for forming end joints is applied, and adhesive 10 ′ for forming central joints is applied to the other belt-shaped sheet 60 . In addition, it is also possible to apply the adhesive 9' for forming one end joint to one belt-shaped sheet, and apply the adhesive 9' for forming the other end joint to the other belt-shaped sheet. material. In addition, it is also possible to apply the adhesive 10' for forming a part of the plurality of central junctions to one strip-shaped sheet, and apply the adhesive 10' for forming the other part to the other. Ribbon sheet.

In addition, instead of making the position of the roller pressurizing the adhesive 9 ′ for forming the end joint portion and the roller pressurizing the adhesive 10 ′ for forming the central joint portion be in the y direction, as in the third embodiment, It is also possible to stagger the application position of the adhesive agent 9' for forming the end joint part and the application position of the adhesive agent 10' for the formation of the central joint part in the conveying direction of the strip-shaped sheet. This makes the time between the two adhesives different from being applied until they are pressed between the rolls.

In addition, instead of pressing only the adhesive 10 ′ for forming the central joint portion with the third roll as in the third embodiment, the adhesive 10 ′ for forming the central joint portion and the end portion may be pressed by the third roll. Adhesive 9' for forming joints is pressurized.

In addition, in the manufacturing method of the fourth embodiment, after the adhesive 9 ′ for forming the end joints and the adhesive 10 ′ for forming the central joint are applied to one surface of the belt-shaped sheet 50 , Utilize the cooling mechanism 20 to cool the adhesive 10', but it is also possible to heat the adhesive 9' without cooling the adhesive 10' after the adhesive 9' and the adhesive 10' are applied, and it is also possible to perform bonding. Cooling of the adhesive 10' and heating of the adhesive 9'.

In addition, instead of forming the end joint portion 9 as a member having a higher adhesive strength between the belt-shaped sheets 50 and 60 and a higher fixing strength of the linear elastic body 7 than the central joint portion 10, the end joint portion 9 may be formed The bonding strength between the strip-shaped sheets 50 and 60 and the fixing strength of the linear elastic body 7 are lower than those of the central joint portion 10 . In this case, the end joint 9 can be used, for example, to suppress movement of the cut end due to shrinkage of the linear elastic body immediately after cutting, and to correct irregular arrangement of the cut end of the linear elastic body.

In addition, the linear elastic body 7 and the belt-shaped sheet 50 are bonded in a state where the viscosity of the adhesive 9' for forming the end joint is higher than that of the adhesive 10' for forming the central joint. The integration of 60 produces a stretchable sheet with higher adhesive strength between the strip-shaped sheets 50 and 60 in the end joint 9 and a higher fixing strength of the linear elastic body 7 than that in the central joint 10 .

In addition, in a pair of rollers used in the integration process, both rollers may not be rotationally driven, but may be driven to rotate in contact with the belt-shaped sheet.

The stretchable sheet produced by the present invention may have only one central joint portion in the widthwise central portion instead of having a plurality of central joint portions in the widthwise central portion. In this case, the central junction is preferably wider than the respective widths of the end junctions on both sides thereof, and more preferably wider than the total width of the end junctions on both sides. In addition, the central joint portion and the end joint portions on both sides thereof may adjoin or be connected without interposing the non-adhesive region.

The size of the joint strength of the central joint part and the end joint part in the stretchable sheet can be judged, for example, by the following method: the dimension (length ) and the size (width) in the direction (CD) perpendicular to the conveying direction (MD) are equal to the test pieces, and the peeling test (90 °Peel test, etc.). The length of the test piece is, for example, 65 mm and the width is 30 mm. When the narrower joint is smaller than the above-mentioned 30 mm among the joints for comparison, the width of the test piece is the width of the narrow joint.

In addition, the parts omitted in the above-mentioned one embodiment and the content contained in only one embodiment can be appropriately applied to other embodiments, and the content of each embodiment can be replaced among the embodiments as appropriate.

In addition, in the first embodiment and the second embodiment, the pressure applied to the adhesive 9' for the end joint is stronger than the pressure applied to the adhesive 10' for forming the central joint. , but it is also possible to pressurize the adhesive 10' for forming the central joint portion more strongly. In addition, in the third embodiment, the time from the application of the adhesive 9' for forming the edge joints to the pressurization of the adhesive 9' by the first and second rollers is different from that from the center of the application. The time for the bonding agent 10' to be pressurized between the third rolls is relatively short, but it is also possible to pressurize the adhesive 10' for the central bonding portion. shorter time. In addition, in the fourth embodiment, the adhesive 9' for forming the end joint 9 is maintained at a temperature higher than that of the adhesive 10' for forming the central joint 10, and the sheet 50, 60, but it is also possible to pressurize in a state where the temperature of the adhesive 10' for forming the central bonding portion 10 is higher. By doing so, it is possible to efficiently manufacture the fixing strength of the linear elastic body 7 in the central joint 10, and the contraction force of the linear elastic body 7 bonded and fixed in the stretched state is less likely to affect the end joint 9. , the linear elastic body 7 is not easy to detach, the appearance is also beautiful, and the soft stretchable sheet 3' and the waist panel 3 are excellent in stretchability.

The elastic sheet produced by the production method of the present invention can be applied to the waist portion of an unfolded or shorts-type disposable diaper, and the waist portion of a shorts-type disposable diaper, in addition to the waist panel 3 of the disposable diaper 1. Waist parts, shorts-type sanitary napkins, disposable underwear, ear straps for disposable face masks, cleaning sheets, bandages, etc.

Regarding the above-mentioned embodiment, the following manufacturing method and disposable diaper of the stretchable sheet are further disclosed.

<1> A method of manufacturing a stretchable sheet that continuously produces stretchable sheets, in which a linear elastic body is placed between a pair of strip-shaped sheets and the strip-shaped sheets The state of being stretched in the direction intersecting the conveying direction is bonded and fixed, and the stretchable sheet has a central joint in the width direction central part, and has a pair of end joints on both sides of the width direction central part. The manufacturing method of the sheet includes the following steps:

In the conveying process, the above-mentioned linear elastic body is wound around the conveying mechanism of the linear elastic body in a state of being stretched in a direction intersecting with the above-mentioned conveying direction using an elastic body winding mechanism, and the rolled elastic body is wound by the conveying mechanism. The threaded elastic body is conveyed in the above-mentioned conveying direction;

an adhesive application step of applying an adhesive to one or both of the pair of strip-shaped sheets; and

In the integration process, the pair of belt-shaped sheets after the above-mentioned adhesive coating process is merged with the above-mentioned linear elastic body conveyed by the above-mentioned conveying mechanism, and the pair of belt-shaped sheets sandwiching the linear elastic body Material is integrally pressurized to obtain the above stretchable sheet,

The joining conditions between the pair of belt-shaped sheets in the integration step are different for the adhesive for forming the central joining portion and the adhesive for forming the end joining portions.

<2> The method for producing a stretchable sheet according to the above <1>, wherein in the integration step, a pair of the belt-shaped sheets is introduced between a pair of rollers and pressed, and, as a pair of The roller is configured to apply pressure to a pair of the above-mentioned belt-shaped sheets at a portion that pressurizes the adhesive for forming the central joint and a portion that pressurizes the adhesive for forming the end joint. Parts with different pressures.

<3> The method for producing a stretchable sheet according to the above <2>, wherein the pressure applied to the adhesive for forming the end joints is higher than the pressure applied to the adhesive for forming the central joint. The pressure is strong.

<4> The method for producing a stretchable sheet according to the above <2> or <3>, wherein at least one of the pair of rollers pressurizes the adhesive for forming the end joint The diameter is larger than the diameter of the portion where the adhesive for forming the central joint portion is pressurized.

<5> The method for producing a stretchable sheet according to any one of the above <2> to <4>, wherein at least one of the pair of rolls is arranged in the width direction of the pair of strip-shaped sheets. Among the plurality of short rollers, the short rollers that pressurize the adhesive for forming the end joints are stronger than the short rollers that pressurize the adhesive for forming the central joints. A pair of the aforementioned belt-shaped sheets is pressed.

<6> The method for producing a stretchable sheet according to any one of the above <1> to <5>, wherein the portion of the roller that pressurizes the adhesive for forming the end joint is The difference (Rs-Rm) between the radius Rs and the radius Rm of the portion pressurizing the adhesive for forming the central joint, or the difference between the portion pressurizing the adhesive for forming the end joint and the radius Rm for the central joint. The difference in the gap at the portion where the adhesive for forming the junction is pressed is preferably 0.01 mm or more, and more preferably 0.01 mm or more and 1 mm or less.

<7> The method for producing a stretchable sheet according to the above <2>, wherein the pressure ratio for pressurizing the adhesive for the end joints is the same as that for the adhesive for forming the central joint. Pressurized pressure is weak.

<8> The method for producing a stretchable sheet according to the above <1>, wherein in the integration step, a pair of the belt-shaped sheets is introduced between a pair of rollers to pressurize them, and from the pair of The period from the time when one or both of the pair of belt-shaped sheets is coated with the adhesive for forming the central joint until the adhesive is pressed between a pair of rolls is different from the time from the time when the adhesive is applied to form the end joint. The adhesive used varies in time until the adhesive is pressed between a pair of rollers.

<9> The method for producing a stretchable sheet according to the above <8>, wherein the period from the application of the adhesive for forming the end joints to the pressurization of the adhesive between a pair of rolls is The time is shorter than the time from application of the above-mentioned adhesive for forming the central joint portion to pressurization of the adhesive between the pair of rollers.

<10> The method for producing a stretchable sheet according to the above <8>, wherein a pair of rollers for pressurizing the adhesive for the central joint portion are provided at a position opposite to the adhesive for the end joint portion. The pair of rollers for pressurizing the adhesive is located downstream of the pair of belt-shaped sheets in the conveyance direction.

<11> The method for producing a stretchable sheet according to any one of the above <8> to <10>, wherein from the application position P1 of the adhesive for forming the central joint part to the above-mentioned The distance (L2) of the position P3 where the adhesive for forming the central joint is pressurized is the distance (L2) from the application position P1 of the adhesive for forming the end joint to the position where the adhesive for forming the end joint is applied by a roller. The ratio (L2/L1) of the distance (L1) at the position P2 where the adhesive is pressed is preferably 1.1 or more, more preferably 1.2 or more, and is preferably 5 or less, more preferably 2 or less, and is preferably 1.1 or more. 5 or less, more preferably 1.2 or more and 2 or less.

<12> The method for producing a stretchable sheet according to any one of <8> to <11> above, wherein one of the pair of rollers that pressurizes one of the end joints and the pair of rollers One of the pair of rollers that presses the other of the end joints is separated in a direction perpendicular to the conveyance direction of the belt-shaped sheet.

<13> The method for producing a stretchable sheet according to the above <12>, wherein the other roller of the pair of rollers that presses one of the end joints and the other roller that presses the end joints The other roller of the pair of rollers for pressing on one side is a common cylindrical roller having a uniform diameter over substantially the entire width of the strip-shaped sheet.

<14> The method for producing a stretchable sheet according to the above-mentioned <8> to <12>, wherein the other roller of the pair of rollers that presses one of the end joints and the roller that presses the end portion The other roller of the pair of rollers that presses the other of the joining portion is a different roller separated in a direction perpendicular to the conveying direction of the belt-shaped sheet.

<15> The method for producing a stretchable sheet according to the above <8>, wherein the application position of the adhesive for forming the end joints and the application of the adhesive for forming the central joint are The positions are shifted in the conveying direction of the above-mentioned belt-shaped sheet, so that the time from application of the two adhesives to pressurization between the rollers is different.

<16> The method for producing a stretchable sheet according to the above <8>, wherein the period from the application of the adhesive for forming the end joints to the pressurization of the adhesive between a pair of rollers is The time is longer than the time from application of the above-mentioned adhesive for forming the central joint portion to pressurization of the adhesive between the pair of rollers.

<17> The method for producing a stretchable sheet according to the above <1>, wherein after the adhesive application step, the adhesive for the central joint or the adhesive for the end joint are performed. Cooling or heating of the adhesive, in the above-mentioned integration process, in the state where the above-mentioned two adhesives that are in a state of different temperatures by cooling or heating exist between a pair of the above-mentioned belt-shaped sheets, between a pair of rollers A pair of the strip-shaped sheets is pressurized.

<18> The method for producing a stretchable sheet according to the above <17>, wherein in the integration step, the temperature of the adhesive for the end joints is lower than that of the adhesive for the central joints. In a high state, pressure is applied between a pair of rolls together with a pair of the belt-shaped sheets.

<19> The method for producing a stretchable sheet according to the above <17> or <18>, wherein the adhesive for forming the end joints and the above-mentioned After the adhesive for forming the central joint is heated, the adhesive for forming the end joint is heated.

<20> The method for producing a stretchable sheet according to any one of the above <17> to <19>, wherein the adhesive for forming the end joint is applied to one surface of the strip-shaped sheet. After the bonding agent and the above-mentioned adhesive for forming the central joint are cooled, the adhesive for forming the central joint is cooled.

<21> The method for producing a stretchable sheet according to the above <17>, wherein in the integration step, the temperature of the adhesive for the central joint is lower than the temperature of the adhesive for the end joint. In a high state, pressure is applied between a pair of rolls together with a pair of the belt-shaped sheets.

<22> The method for producing a stretchable sheet according to any one of <1> to <21> above, wherein in the composite sheet in which a pair of strip-shaped sheets is bonded with an adhesive, The stretched linear elastic body extending from the side edge of the composite sheet in the conveying direction to the outside of the composite sheet is cut to unwind the linear elastic body from the conveying mechanism.

<23> The method for producing a stretchable sheet according to any one of <1> to <22> above, wherein the width W1 of the end joint is preferably 3 mm or more, more preferably 5 mm or more, and It is preferably 20 mm or less, more preferably 10 mm or less, and more preferably 3 mm or more and 20 mm or less, more preferably 5 mm or more and 10 mm or less.

<24> The method for producing a stretchable sheet according to any one of <1> to <23> above, wherein the width W2 of the central joint portion is preferably 0.1 mm or more, more preferably 0.5 mm or more, and , preferably 5 mm or less, more preferably 1.5 mm or less, more preferably 0.1 mm to 5 mm, more preferably 0.5 mm to 1.5 mm.

<25> The method for producing a stretchable sheet according to any one of <1> to <24> above, wherein the distance W3 between the adjacent end joints and the central joint is preferably 1 mm or more, More preferably 3 mm or more, and preferably 10 mm or less, more preferably 7 mm or less, more preferably 1 mm or more and 10 mm or less, more preferably 3 mm or more and 7 mm or less.

<26> The method for producing a stretchable sheet according to any one of the above <1> to <25>, wherein the stretchable sheet has a plurality of the central joints, and two adjacent central joints are joined together. The interval W4 between the parts is preferably 1 mm or more, more preferably 3 mm or more, and preferably 10 mm or less, more preferably 7 mm or less, and preferably 1 mm or more and 10 mm or less, more preferably 3 mm or more and 7 mm or less.

<27> The method for producing a stretchable sheet according to any one of the above-mentioned <1> to <26>, wherein the distance between two adjacent linear elastic bodies in the longitudinal direction of the stretchable sheet is W5 is preferably 2 mm or more, more preferably 4 mm or more, and preferably 12 mm or less, more preferably 10 mm or less, and preferably 2 mm or more and 12 mm or less, more preferably 4 mm or more and 10 mm or less.

<28> The method for producing a stretchable sheet according to any one of the above <1> to <27>, wherein the end strip is coated on one of the pair of strip-shaped sheets. The adhesive agent for forming the part junction part and the adhesive agent for forming the above-mentioned central junction part.

<29> The method for producing a stretchable sheet according to any one of the above <1> to <27>, wherein the end strip is coated on one of the pair of strip-shaped sheets. The adhesive for forming the central joint is applied to the other belt-shaped sheet.

<30> The method for producing a stretchable sheet according to any one of the above <1> to <29>, wherein a pair of the belt-shaped joints are formed as the end joints compared with the central joint. The bonded portion has a high bonding strength between the sheets and a high fixing strength of the above-mentioned linear elastic body.

<31> The method for producing a stretchable sheet according to any one of the above <1> to <29>, wherein a pair of the above-mentioned belt-shaped joints are formed as the above-mentioned end joints compared with the above-mentioned central joint. The bonded portion is low in the adhesive strength between the sheets and the fixation strength of the above-mentioned linear elastic body.

<32> The method for producing a stretchable sheet according to any one of the above <1> to <31>, which is implemented using an apparatus comprising the following components:

A coating device comprising: a conveying mechanism for the above-mentioned linear elastic body; a rotating arm for winding the elastic body to continuously wind the above-mentioned linear elastic body on the conveying mechanism in an elongated state; an elastic body, an elastic body supply mechanism that introduces the linear elastic body in an extended state to the rotating arm; and a conveying mechanism that feeds the linear elastic body wound by the rotating arm to a pair of above-mentioned belt-shaped sheets ; and an application mechanism for applying the adhesive to the tape-shaped sheet;

an integrated mechanism that uses a pair of pinch rollers to fix the above-mentioned linear elastic body in an elongated state between a pair of the above-mentioned belt-shaped sheets;

The cutting mechanism cuts the linear elastic body extending outward from both ends of the pair of strip-shaped sheets along the conveying direction, and releases the linear elastic body from being wound by the conveying mechanism.

<33> The method for producing a stretchable sheet according to the above <32>, wherein the pair of pinch rolls includes one pinch roll and the other pinch roll,

One of the pinch rollers has a small-diameter portion M with a relatively small diameter at the central portion in the axial direction, and has relatively large-diameter portions S, S at both ends in the axial direction.

The small-diameter portion M pressurizes a portion of the belt-shaped sheet where the adhesive for forming the central joint is present between the two, and the large-diameter portions S and S are located between the two of the belt-shaped sheet. The portion where the adhesive for forming the end joint is present is pressurized.

<34> The method for producing a stretchable sheet according to the above <32> or <33>, wherein the pair of pinch rolls includes one pinch roll and the other pinch roll, and the other pinch roll The pinch roll has a constant diameter over the entire width of the strip-shaped sheet.

<35> The method for producing a stretchable sheet according to any one of the above <1> to <34>, wherein the stretchable sheet has a plurality of center joining portions at a central portion in the width direction.

<36> The method for producing a stretchable sheet according to any one of the above <1> to <35>, wherein the stretchable sheet has only one central joining portion in a widthwise central portion.

<37> The method for producing a stretchable sheet according to the above <36>, wherein the central joint portion has a wider width than each of the end joint portions.

<38> The method for producing a stretchable sheet according to the above <36> or <37>, wherein the central joint is wider than the total width of the pair of end joints.

<39> The method for producing a stretchable sheet according to any one of <1> to <38> above, wherein the central joint and the end joints are adjacent or continuous without interposing a non-adhesive region. .

<40> A disposable diaper comprising: an absorbency having an abdominal portion located on the abdominal side of the wearer when worn, a dorsal portion located on the back side, and a crotch portion located between the abdominal portion and the dorsal portion The main body; and a pair of left and right waist flaps connected to the left and right sides of the back side,

The said waist panel uses the elastic sheet obtained by the manufacturing method of the elastic sheet in any one of said <1>-<39>.

Industrial availability

According to the manufacturing method of the stretchable sheet of the present invention, it is possible to efficiently form the part where the joint strength between the sheets and the fixing strength of the linear elastic body to the sheet are different from each other, and it is possible to effectively improve the linear tension in the stretchable sheet. Anti-shedding, softness, and aesthetics of elastomers. For example, as a stretchable sheet, it is possible to efficiently manufacture a stretchable sheet in which the linear elastic body does not easily come off from the end joints and has excellent air permeability, flexibility, and stretchability between the end joints.

Claims (21)

1. the manufacture method of the Stretchable sheet of a continuous manufacture Stretchable sheet, it is characterised in that:

In described Stretchable sheet, between a pair strip of sheet material, linear elastic bodies is adhesively fixed with the state of elongation on the direction that the conveying direction with this strip of sheet material intersects, width central part at Stretchable sheet has central joint, and in the both sides of this width central part, there is pair of end portions junction surface

The manufacture method of described Stretchable sheet includes following operation:

Conveying operation, use elastomer winding mechanism by described linear elastic bodies to become the conveying mechanism being wound in this linear elastic bodies on the direction intersected with described conveying direction in the way of the state of elongation, utilize this conveying mechanism this linear elastic bodies of winding to be carried on described conveying direction；

Adhesive applicating operation at one or both adhesive-applying of strip of sheet material described in a pair；With

Integration operation, makes strip of sheet material described in a pair after described adhesive applicating operation converge with the described linear elastic bodies carried by described conveying mechanism, a pair this strip of sheet material clipping this linear elastic bodies is pressurizeed integratedly, obtains described Stretchable sheet,

Making described in a pair the engaging condition in described integration operation between strip of sheet material is that the bonding agent formed for described central joint is different with the bonding agent that described engaged at end portion is formed,

In described integration operation, strip of sheet material described in a pair is imported between pair of rolls and pressurize, and, as a pair this roller, adopt the part being configured to the part in the bonding agent pressurization that described central joint is formed and the bonding agent pressurization to the formation of described engaged at end portion, the parts that the pressure of strip of sheet material applying described in a pair is different

At least one party in roller described in a pair, the diameter of the part that the diameter of the part of the bonding agent pressurization that described engaged at end portion is formed pressurizes more than the bonding agent that described central joint is formed,

The pressure of the bonding agent pressurization that described central joint is formed by the pressure ratio of the bonding agent pressurization that described engaged at end portion is formed is strong.

2. the manufacture method of Stretchable sheet as claimed in claim 1, it is characterised in that:

At least one party in roller described in a pair includes the multiple short rollers arranged at the width of strip of sheet material described in a pair, in multiple described short rollers, strip of sheet material described in a pair is pressurizeed by the short roller of the bonding agent pressurization that central joint described in the short roller comparison of the bonding agent pressurization that described engaged at end portion is formed is formed more strongly.

3. the manufacture method of Stretchable sheet as claimed in claim 1 or 2, it is characterised in that:

The radius Rs of the part of the bonding agent pressurization that described engaged at end portion is formed in described roller and the difference (Rs-Rm) of radius Rm of the part of the bonding agent pressurization that described central joint is formed, or between the side face of roller described in a pair, the gap of part of bonding agent pressurization that described engaged at end portion is formed be more than 0.01mm with the difference in the gap of the part of the bonding agent pressurization that described central joint is formed.

4. the manufacture method of Stretchable sheet as claimed in claim 3, it is characterised in that:

The difference in described gap is more than 0.01mm below 1mm.

5. the manufacture method of the Stretchable sheet of a continuous manufacture Stretchable sheet, it is characterised in that:

In described Stretchable sheet, between a pair strip of sheet material, linear elastic bodies is adhesively fixed with the state of elongation on the direction that the conveying direction with this strip of sheet material intersects, width central part at Stretchable sheet has central joint, and in the both sides of this width central part, there is pair of end portions junction surface

The manufacture method of described Stretchable sheet includes following operation:

Conveying operation, use elastomer winding mechanism by described linear elastic bodies to become the conveying mechanism being wound in this linear elastic bodies on the direction intersected with described conveying direction in the way of the state of elongation, utilize this conveying mechanism this linear elastic bodies of winding to be carried on described conveying direction；

Adhesive applicating operation at one or both adhesive-applying of strip of sheet material described in a pair；With

Integration operation, makes strip of sheet material described in a pair after described adhesive applicating operation converge with the described linear elastic bodies carried by described conveying mechanism, a pair this strip of sheet material clipping this linear elastic bodies is pressurizeed integratedly, obtains described Stretchable sheet,

Making described in a pair the engaging condition in described integration operation between strip of sheet material is that the bonding agent formed for described central joint is different with the bonding agent that described engaged at end portion is formed,

After described adhesive applicating operation, carry out cooling or the heating of the bonding agent of described central joint formation or the bonding agent of described engaged at end portion formation, in described integration operation, the state of the bonding agent to be formed at the bonding agent and described engaged at end portion that there is the described central joint formation being in the different state of temperature by cooling down or heat described in a pair between strip of sheet material, between pair of rolls, a pair this strip of sheet material is pressurizeed, and with the state that the bonding agent of described engaged at end portion formation is higher than the bonding agent temperature that described central joint is formed, between pair of rolls, a pair this strip of sheet material is pressurizeed.

6. the manufacture method of Stretchable sheet as claimed in claim 5, it is characterised in that:

After the one side of described strip of sheet material applies the bonding agent of described engaged at end portion formation and the bonding agent of described central joint formation, heat the bonding agent that this engaged at end portion is formed.

7. the manufacture method of the Stretchable sheet as described in claim 5 or 6, it is characterised in that:

After the one side of described strip of sheet material applies the bonding agent of above-mentioned engaged at end portion formation and the bonding agent of described central joint formation, carry out the cooling of the bonding agent that this central joint is formed.

8. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

In composite sheet engaged by bonding agent between strip of sheet material described in a pair, the described linear elastic bodies extending to the elongation state of the foreign side of this composite sheet from the lateral margin along conveying direction of this composite sheet is cut off, releases this linear elastic bodies reeling condition to conveying mechanism.

9. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

The strip of sheet material of the side in strip of sheet material described in a pair applies the bonding agent of described engaged at end portion formation and the bonding agent of described central joint formation.

10. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

The strip of sheet material of the side in strip of sheet material described in a pair applies the bonding agent that described engaged at end portion is formed, the strip of sheet material of the opposing party applies the bonding agent that described central joint is formed.

11. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

Compared with described central joint, described engaged at end portion is formed as described in a pair the junction surface that the fixing intensity of the adhesive strength between strip of sheet material and described linear elastic bodies is higher.

12. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

Compared with described central joint, described engaged at end portion is formed as described in a pair the less junction surface of fixing intensity of the adhesive strength between strip of sheet material and described linear elastic bodies.

13. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

The method uses the manufacture device including components described below to implement, and described manufacture device includes:

By the turning arm of the elastomer winding that described linear elastic bodies is wound on described conveying mechanism with elongation state continuously；

Send this linear elastic bodies continuously, this linear elastic bodies is imported to elongation state the elastomer feed mechanism of this turning arm；

The described conveying mechanism that this linear elastic bodies after being wound by this turning arm is transported to described in a pair between strip of sheet material；

Have adhesive applicating in the applying device of the applying mechanism of this strip of sheet material；

Integrated mechanism, it uses pair of rolls the described linear elastic bodies of elongation state to be fixed on described in a pair between strip of sheet material；With

Shut-off mechanism, it cuts off the both ends along conveying direction from strip of sheet material described in a pair and extends to the linear elastic bodies of foreign side, releases the linear elastic bodies reeling condition relative to described conveying mechanism.

14. the manufacture method of Stretchable sheet as claimed in claim 13, it is characterised in that:

There is the roller of a side and the roller of the opposing party as roller described in a pair,

The roller of one side is used in the central part in its axial length direction and has a minor diameter part that diameter is relatively small, and has the roller of the relatively large large-diameter portion of diameter at the both ends in axial length direction,

Described minor diameter part is to the position pressurization that there is the bonding agent that central joint is formed between the two in described strip of sheet material, and described large-diameter portion is to the position pressurization that there is the bonding agent that engaged at end portion is formed between the two in this strip of sheet material.

15. the manufacture method of Stretchable sheet as claimed in claim 13, it is characterised in that:

There is the roller of a side and the roller of the opposing party as roller described in a pair,

The roller of the opposing party diameter in the whole width range of described strip of sheet material is certain.

16. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

Described Stretchable sheet has multiple central joint at width central part.

17. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

Described Stretchable sheet only has a central joint at width central part.

18. the manufacture method of Stretchable sheet as claimed in claim 17, it is characterised in that:

Described central joint is wider than the respective width in described engaged at end portion.

19. the manufacture method of Stretchable sheet as claimed in claim 17, it is characterised in that:

Described central joint is wider than the total width in engaged at end portion described in a pair.

20. the manufacture method of the Stretchable sheet as described in claim 1 or 5, it is characterised in that:

Central joint and engaged at end portion are not adjacent or continuous across ground, non-adhesive region.

21. a manufacture method for disposable diaper, described disposable diaper includes: when there is wearing in the veutro portion of the veutro of wearer, in the absorbent main body of the drosal part of dorsal part and the crotch between veutro portion and drosal part；With the waist panel that left and right two foreign side at drosal part connects the pair of right and left arranged, the manufacture method of this disposable diaper is characterised by:

The Stretchable sheet used in described waist panel is manufactured by the manufacture method of the Stretchable sheet according to any one of claim 1～20.