JP6099130B2 - Pad type disposable diaper - Google Patents

Description

  The present invention relates to a pad-type disposable diaper.

  As disposable diapers, those of a pad type, a tape type, a pants type and the like are provided. Moreover, the auxiliary | assistant absorbent article which can be absorbed from both front and back is also provided as one form of pad type.

  Pad-type disposable diapers (see Patent Documents 1 and 2) are assumed to be used on the inner surface of outer (used outside) disposable diapers such as a tape type and a pants type. A general disposable diaper that becomes an outer one is generally one in which three-dimensional gathers projecting to the body side extend in the front-rear direction on both sides of the surface. It is preferable that the pad-type disposable diaper fits between three-dimensional gathers.

  However, when the space between the three-dimensional gathers in the crotch part is narrow like a slim pants-type disposable diaper, if you try to lay a pad-type disposable diaper with a wide absorbent body width to secure a large amount of absorption The pad-type disposable diaper's absorbent body will not fit in the outer gathered outer diaper's three-dimensional gathering, or will be pushed in forcefully, not only making it difficult to wear, worsening the wearing feeling, but also leaking. There is also a fear.

  In particular, in pad-type disposable diapers, in order to ensure a particularly large amount of absorption, the width of the absorbent body is adjusted to the wearer's crotch dimension at the crotch part and the absorbent body width is wide enough on both sides (See the form shown in FIG. 1). When such a pad-type disposable diaper is applied to an outer with a narrow three-dimensional gather interval, even if the crotch part fits between the outer three-dimensional gathers, the absorbent built-in part exceeds the outer three-dimensional gather on both the front and rear sides of the crotch part. Therefore, the above problem occurs on the ventral side and the dorsal side.

JP-A-9-99007 JP 2009-195309 A

  Then, the main subject of this invention is providing the pad type disposable diaper which can be set as the mounting | wearing state which is hard to leak when it lays on an outer inner surface, and can use it while ensuring much absorption.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable top sheet forming the surface, a liquid-impermeable sheet located on the back side, an absorbent body interposed therebetween, and an inner three-dimensional gather projecting to the front side with both sides of the surface as root parts With
In the pad-type disposable diaper used to lay on the inner surface of the outer disposable diaper with outer three-dimensional gathers projecting to the front side with both sides of the surface as the root part,
A main absorbent part located in the middle of the width direction and containing the absorber;
A pair of left and right inner easily bent portions extending in the front-rear direction, each provided along both side edges of the main absorbent portion;
A pair of left and right outer easily bent portions extending in the front-rear direction provided at intervals on the outer sides in the width direction of these inner easily bent portions,
A side absorption part containing the absorber, provided on the outer side in the width direction of these outer easily bent parts and on the center side in the width direction than the root part of the inner three-dimensional gather,
A portion between the inner easily bent portion and the outer easily bent portion stands together with the outer three-dimensional gather located on the back side due to the bending of the inner easily bent portion, and the side absorbent portion has the outer easily bent portion. It is configured not to stand by bending of
A pad-type disposable diaper characterized by that.

(Function and effect)
In the present invention, since the portion between the inner easily bent portion and the outer easily bent portion stands together with the outer three-dimensional gather located on the back side due to the bending of the inner easily bent portion, the leakage prevention wall is provided at the position of the outer three-dimensional gather. It is formed. Moreover, since the side absorption part does not stand up due to the bending of the outer easily bent part, the inner three-dimensional gathering properly protrudes further outward in the width direction of the leakage preventing wall formed at the position of the outer three-dimensional gather, and the leakage preventing function is properly provided. Demonstrate. Furthermore, since a side absorption part incorporates an absorber, it cannot be overemphasized that many absorptions can be ensured. As a result, the pad-type disposable diaper of the present invention can secure a large amount of absorption, but can be put into a wearing state that is difficult to leak when used on the outer inner surface.

<Invention of Claim 2>
The portion between the inner easily bent portion and the outer easily bent portion is a non-absorbent region that does not incorporate the absorber,
The inner easily bent portion is formed by the boundary between the region where the absorber of the main absorbent portion is incorporated and the non-absorbent region,
The outer easily bent portion is formed by the boundary between the region where the absorber of the side absorbent portion is incorporated and the non-absorbent region.
The pad type disposable diaper according to claim 1.

(Function and effect)
The inner easily bent portion and the outer easily bent portion of the present invention can be formed by embossing the absorber along the bent position or by forming a thin wall portion. When formed using the body region, the portion between the inner easily bent portion and the outer easily bent portion becomes flexible and lightweight, so that it is easy to stand up with the outer three-dimensional gather located on the back side, and the side absorbent portion This is preferable because the fit to the skin and the followability are improved.

<Invention of Claim 3>
The portion between the inner easily bent portion and the outer easily bent portion is folded onto the main absorbent portion and joined to the surface of the main absorbent portion in a lying state at each position on the front side and the rear side from the crotch portion. The pad-type disposable diaper according to claim 1, wherein the pad-type disposable diaper is configured to stand between the joined portions.

(Function and effect)
By adopting such a structure, excrement that moves in the front-rear direction along the portion between the inner easily bent portion and the outer easily bent portion is blocked by the portion joined in the lying state, before or after It becomes difficult to leak.

<Invention of Claim 4>
The pad-type disposable diaper according to claim 3, wherein an elongated elastic elastic member is fixed in an extended state along the front-rear direction to an end of the side absorbent portion on the outer easily bent portion side.

(Function and effect)
By adopting such a structure, a portion between the inner easily bent portion and the outer easily bent portion becomes a state similar to a solid gather. As a result, even when there is no push-up from the back side by the outer three-dimensional gather when mounting, in the region located between the portions that are lying down in the front-rear direction, between the inner easily bent portion and the outer easily bent portion Not only is it easy to fit the outer three-dimensional gather to the back side of the part between the inner easily bent part and the outer easily bent part, but also the side absorbent parts fit to the skin, followability, and eventually the inner The fit and follow-up of the three-dimensional gather will be even better.

<Invention of Claim 5>
The pad-type disposable diaper according to claim 3 or 4, wherein at least one of the main absorbent portion and the side absorbent portion does not incorporate the absorbent body in a portion where the main absorbent portion and the side absorbent portion overlap in the lying state. .

(Function and effect)
Form in which the portion between the inner easily bent portion and the outer easily bent portion is folded on the main absorbent portion at each position on the front side and the rear side from the crotch portion and joined to the surface of the main absorbent portion in a lying state Then, in the part where the main absorption part and the side absorption part overlap in the lying state, when the absorber is built in both the main absorption part and the side absorption part, the thickness increases unnecessarily, the feeling of wearing deteriorates, May lead to leakage. Therefore, it is desirable that at least one of the main absorption portion and the side absorption portion does not incorporate an absorber in a portion where the main absorption portion and the side absorption portion overlap in a lying state.

  As described above, according to the present invention, it is possible to secure a large amount of absorption, and bring about an advantage that it is possible to obtain a wearing state that is difficult to leak when used on the outer inner surface.

It is a top view which shows the inner surface side of the expansion | deployment state of a pad type disposable diaper. It is a top view of the unfolding state which shows only a principal part. (A) YY sectional drawing of FIG. 1, (b) It is sectional drawing of the negative junction state. (A) ZZ sectional drawing of FIG. 1, (b) It is sectional drawing of the mounting state. It is a perspective view which shows the inner surface side of a mounting state. It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part top view of the underpants type disposable diaper of an unfolded state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows the adhesive agent application pattern of a pants type disposable diaper. It is a top view which shows the elastic member cut pattern of a pants type disposable diaper. It is a perspective view of the wearing state of a pants type disposable diaper. It is a rear view of the wearing state of a pants type disposable diaper. It is DD sectional drawing of FIG. It is a rear view of the wearing state of a pants type disposable diaper. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part enlarged plan view (outer surface side) of the underpants type disposable diaper of a deployment state. It is sectional drawing equivalent to the AA cross section of FIG. 6 in another form.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “groin” in the terminology of the present invention means a part that corresponds to the crotch of the body at the time of use, and depending on the product, from the center in the front-rear direction of the article as shown in the figure to the predetermined part on the front side. Range, or a predetermined range at the center in the front-rear direction of the article. In the case of having a narrow constricted portion in the middle in the front-rear direction of the article or in the middle in the front-rear direction of the absorbent body, it means a predetermined front-rear direction range having the minimum width portion of one or both constricted portions in the center in the front-rear direction. Further, “front part (abdominal part)” means a part on the front side of the crotch part, and “rear part (back side part)” means a part on the rear side of the crotch part.

<Examples of pad-type disposable diapers>
(Basic structure)
1 to 5 show a pad-type disposable diaper example 200 according to the present invention. This pad-type disposable diaper 200 has a crotch portion C2, and a front portion F2 and a rear portion B2 extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate. For example, the total length (length in the front-rear direction) L is about 350 to 700 mm, and the total width W1 is about 130 to 400 mm (however, wider than the width of the absorbent surface of the diaper). In this case, the length of the crotch portion C2 in the front-rear direction is about 10 to 150 mm, the length of the front portion F2 is about 50 to 350 mm, and the length of the rear portion B2 is about 50 to 350 mm. be able to.

  The pad-type disposable diaper 200 has a basic structure in which an absorbent body 223 is interposed between the inner surface of the liquid-impermeable sheet 221 and the liquid-permeable top sheet 222.

  A liquid-impermeable sheet 221 is provided on the back side of the absorbent body 223 so as to protrude slightly from the peripheral edge of the entire absorbent body 223. As the liquid-impermeable sheet 221, a sheet having moisture permeability can be used in addition to a polyethylene film or the like without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. The outer surface of the liquid-impermeable sheet 221 can be covered with an exterior sheet made of a nonwoven fabric.

  The surface side of the absorber 223 is covered with a liquid-permeable top sheet 222. In the illustrated form, in the region where inner solid gathers described later are overlaid and joined on the top sheet 222, the absorber 223 partially protrudes from the side edge of the top sheet 222, but the absorber 223 protrudes. The width of the top sheet 222 can be increased so that there is no such problem. As the top sheet 222, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  It is desirable to interpose an intermediate sheet 225 between the top sheet 222 and the absorber 223. This intermediate sheet 225 is provided to prevent the urine that has been absorbed by the absorbent body 223 from returning, and uses a material having low water retention and high liquid permeability, such as various nonwoven fabrics and mesh films. Is desirable. When the front end of the top sheet 222 is 0% and the rear end of the top sheet 222 is 100%, the front end of the intermediate sheet 225 is preferably located in the range of 0 to 11%, and the rear end of the intermediate sheet 225 is It is preferably located in the range of 92 to 100%. The width W4 of the intermediate sheet 225 is preferably about 50 to 90% of the width W2 of the absorber 223 described later.

  At both ends in the front-rear direction of the pad-type disposable diaper 200, the liquid-impermeable sheet 221 and the liquid-permeable top sheet 222 are attached to the front and rear ends of the absorbent body 223 so as to extend to the front and rear sides, respectively. A non-end flap portion EF is formed. On both sides of the pad-type disposable diaper 200, the liquid-impermeable sheet 221 extends outward from the side edge of the absorbent body 223, and the inner surface of the portion from the extended part to the side part of the top sheet 222 A side flap portion in which the outer side portion 224x of the gather sheet 224s constituting the inner three-dimensional gather 224 is pasted over the entire front-rear direction (this portion becomes a root portion of the inner three-dimensional gather 224), and the absorbent body 223 is not present. SF is constituted. 1 are shown by hatched patterns in FIG. 1, and dotted patterns in FIGS. 3 and 4, respectively, and can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing.

  As a material for the gather sheet 224s, a plastic sheet or a melt-blown nonwoven fabric can be used. However, in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  The portion 224c on the center side in the width direction of the gather sheet 224s extends to the top sheet 222 and is folded back at the extending portion to form a two-layer structure. The elongated elastic member 224G is fixed at least at the tip portion with a hot melt adhesive or the like in the stretched state along the front-rear direction. As the elongated elastic member 224G, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are formed in a thread shape, a string shape, a belt shape, etc. Ordinarily used materials can be used.

  In addition, both gather sheets 224s have the widthwise outer portion 224x adhered and fixed to the liquid-impermeable sheet 221 over the entire front and rear direction, and the widthwise center side portion 224c is lying down at both ends in the front and rear direction. In this state, it is bonded and fixed to the inner surface of the article (the surface of the top sheet 222 in the illustrated embodiment), and is not fixed to the inner surface of the article (the surface of the top sheet 222 in the illustrated embodiment) between both ends in the front-rear direction. As shown in FIG. 4B, the non-fixed portion is a portion that becomes a barrier portion that can stand up with respect to the inner surface of the article (the surface of the top sheet 222 in the illustrated form), and the standing base end 224b is a gather sheet. It is positioned at the boundary between the outer fixed portion 224x and the inner portion 224c in 224s.

  The absorbent body 223 is basically made of a pulp fiber stack, a collection of filaments such as cellulose acetate, or a non-woven fabric, and is obtained by mixing and adhering a superabsorbent polymer such as particles as necessary. Can be used. The absorbent body 223 can be wrapped with a wrapping sheet 226 such as crepe paper (not shown in the cross-sectional view) as necessary, such as when mixing superabsorbent polymer particles.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorbent body 223 can be appropriately determined, but the fiber basis weight is preferably about 100 to 600 g / m ^2, and the basis weight of the absorbent polymer is about 0 to 400 g / m ^2. Is preferable. More specifically, the fiber basis weight of the lower layer absorbent body 223B can be, for example, about 80 to 400 g / m ² , and the basis weight of the superabsorbent polymer can be, for example, about 50 to 400 g / m ^2. Can be about 80 to 300 g / m ² , and the basis weight of the superabsorbent polymer can be about 10 to ²⁰⁰ g / m ^2, for example.

  The outer peripheral shape of the absorbent body 223 as a whole is a shape in which a predetermined portion in the middle in the front-rear direction including the crotch portion C2 has a narrow constricted portion 223n. The minimum width W5 of the constricted portion 223n is preferably about 50 to 65% of the width W2 of the non-constricted portion located before and after the constricted portion 223n. Further, when the front end of the article is 0% and the rear end of the article is 100%, the front end of the constricted portion 223n is preferably located in the range of 10 to 25%, and the rear end of the constricted portion 223n is 40 to 65%. It is preferable that the portion of the constricted portion 223n having the minimum width W5 (minimum width portion) is preferably in the range of 25 to 30%.

(Characteristic part)
Characteristically, as shown in FIG. 1 to FIG. 5, they are located in the middle in the width direction and provided along the both side edges in the width direction of the main absorption portion 230 and the main absorption portion 230 containing the absorber 223. A pair of left and right inner easily bent portions 235 extending in the front-rear direction, and a pair of left and right outer easily bent portions extending in the front-rear direction provided at intervals on the outer sides in the width direction of the inner easily bent portions 235. 236 and a side absorbent portion 231 having a built-in absorber 223 provided on the outer side in the width direction of the outer easily bent portion 236 and on the center side in the width direction with respect to the root portion of the inner three-dimensional gather 224. Yes.

  In use, as can be seen from FIGS. 4B and 5, the portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236 is bent by the inner easily bent portion 235 (viewed from the surface side). In order to stand up together with the outer three-dimensional gather BS located on the back side by the bending of the valley fold, a leakage prevention wall is formed at the position of the outer three-dimensional gather BS. Further, since the side absorbing portion 231 does not stand up due to the bending of the outer easily bent portion 236 (bending of the mountain fold as viewed from the surface side), the side absorbing portion 231 is further outward in the width direction of the leakage preventing wall formed at the position of the outer three-dimensional gather BS. The inner three-dimensional gather 224 appropriately protrudes and appropriately exhibits the leakage prevention function. Furthermore, since the side absorption part 231 contains the absorber 223, it cannot be overemphasized that many absorption quantities can be ensured. As a result, the pad-type disposable diaper of the present invention can secure a large amount of absorption, but can be put into a wearing state that is difficult to leak when used on the outer inner surface.

  The inner easily bent portion 235 and the outer easily bent portion 236 can be formed by embossing the absorber 223 formed integrally along the bending position or by forming a thin portion, In the illustrated embodiment, a portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236 is a non-absorbent region 232 that does not include the absorber 223 and includes the absorber 223 of the main absorber 230. The inner easily bent portion 235 is formed by the boundary between the region and the non-absorbent region 232, and the outer easy portion is formed by the boundary between the region in which the absorber 223 of the side absorbent portion 231 is built and the non-absorbent region 232. A bent portion 236 is formed. As described above, when the inner easily bent portion 235 and the outer easily bent portion 236 are formed using the non-absorbent body region 232, the portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236 is flexible and lightweight. Therefore, it is easy to stand up together with the outer three-dimensional gather BS located on the back side, and the fit of the side absorbing portion 231 to the skin and the followability are improved, which is preferable. Although the width | variety (width | variety of the narrowest part) of the non-absorbent body area | region 232 can be defined suitably, it is preferable to set it as more than the protrusion height of the outer three-dimensional gather BS from the surface of an outer disposable diaper. It is preferable to be about 70 mm. Of course, unlike the illustrated embodiment, the absorber 223 can be incorporated in the portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236.

  On the other hand, as shown in FIG. 3B, a portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236 is located above the main absorbent portion 230 at each position on the front side and the rear side from the crotch portion. When folded and joined to the surface of the main absorbent portion 230 in a lying state by the joining means 234, and configured to stand up between these joined portions, the inner easily bent portion 235 and the outer easily bent portion The excrement that moves in the front-rear direction along the portion between the portions 236 is preferable because it is blocked by the portion joined in a lying state and is difficult to leak before or after. As the joining means 234, a hot melt adhesive is assumed in the illustrated example, but other joining means such as heat sealing and ultrasonic sealing may be used.

  Furthermore, in this case, when the elongated elastic elastic member 238 is fixed in an extended state along the front-rear direction to the end of the side absorbent portion 231 on the inner easily bent portion 235 side, the inner easily bent portion 235 and the outer easily bent portion 235 are fixed. The part 232 between the parts 236 becomes a state similar to a solid gather. As a result, even when there is no push-up from the back side by the outer three-dimensional gather BS at the time of mounting, in the region located between the portions that are lying down in the front-rear direction, the inner easily bent portion 235 and the outer easily bent portion 236 The portion 232 between the upper and lower easily bent portions 235 and 236 can be easily fitted to the back side of the portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236. The fitting property and the following property of the inner three-dimensional gather 224 are further improved. In particular, as shown in the figure, the absorbent body 223 of the side absorbent portion 231 has a shape in which the portion where the elongated elastic elastic member 238 is disposed at the end portion on the inner easily bent portion 235 side, and the absorbent body 223 is attached to the portion. A structure without the built-in structure is preferable because not only the contraction force of the elongated elastic expansion / contraction member 238 acts more reliably, but also the absorber 223 of the side absorption portion 231 does not unnecessarily contract and mokomoko.

  Further, a portion 232 between the inner easily bent portion 235 and the outer easily bent portion 236 is folded back onto the main absorbent portion 230 at each position on the front side and the rear side from the crotch portion, and the main absorbent portion 230 in a lying state. In the form that is joined to the surface of the main absorbent portion 230 and the side absorbent portion 231 in the lying state, if the absorber 223 is incorporated in both the main absorbent portion 230 and the side absorbent portion 231, the thickness is increased. May increase unnecessarily, leading to deterioration in wearing comfort and leakage. Therefore, as shown in FIGS. 2 and 3B, at least one of the main absorbent portion 230 and the side absorbent portion 231 (the main absorbent portion 230 in the illustrated embodiment) has a shape in which a corner portion of the built-in absorbent body 223 is cut away. Thus, it is desirable that the absorber 223 is not built in the portion 239 where the main absorber 230 and the side absorber 231 overlap in the lying state.

  Moreover, when the elongate elastic expansion / contraction member 237 is fixed to the side flap part on the side of the side absorbent part 231 in an elongated state along the front-rear direction as shown in the figure, the side absorbent part 231 and its side This is preferable because the fit of the one is improved. Although the elongated elastic elastic member 237 is provided only in the crotch portion in the illustrated embodiment, it can be provided over a wider range in the front-rear direction.

<Outer disposable diaper example>
The outer disposable diaper 1 combined with the pad-type disposable diaper 200 of the present invention is not particularly limited, and can be a larger pad-type disposable diaper or a tape-type disposable diaper. A pants-type disposable diaper is preferable in that it becomes. So, below, an example of the underpants type disposable diaper as this outer disposable diaper 1 is demonstrated.

  6-20 has shown the underpants type disposable diaper 1 of embodiment. The pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 that forms a front body F and a back body B, and an interior body 10 that is fixed and integrated with the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. Folded at the center of the vertical direction (front-rear direction) which is the boundary of B, both sides thereof are joined to each other by heat welding or hot melt adhesive, etc., and side seal portions 21 and 22 are formed. And it becomes a pants type disposable diaper in which a pair of left and right leg openings are formed.

(External sheet structure example)
As shown in FIGS. 9 to 11, the exterior sheet 20 is a two-layer structure sheet in which an inner layer 20 </ b> A and an outer layer 20 </ b> B each made of a nonwoven fabric are bonded together by a hot melt adhesive, Various elastic members 24 are sandwiched and fixed in a stretched state between the nonwoven fabrics of the folded portion 20C formed by folding the outer layer 20B to the inner surface side at the waist opening edge between the layers 20B and imparting elasticity. The planar shape forms a pseudo hourglass shape as a whole by the concave leg opening edges (edges of the leg opening portions) 29 formed to form the leg openings on the both sides of the middle. As the elastic members 24 to 28, synthetic rubber or natural rubber formed into an elongated shape such as a thread shape, a string shape, or a belt shape can be used.

  In particular, in the illustrated exterior sheet 20, as shown in FIGS. 6 to 8, in each of the front body F and the back body B, a waist elastic member 24 disposed in the vicinity of the waist opening 23, and the waist Aside from the waist elastic members 25, which are arranged on the crotch side with respect to the elastic members 24 and arranged in the width direction at intervals in the vertical direction, and the waist elastic members 25, the front body F From the side seal parts 21 and 22 that join the back body B to the part overlapping the both side parts of the interior body 10 while curving toward the opposite body side along the leg opening edge 29 toward the center in the width direction A plurality of curved elastic members 26 and 28 that extend and are spaced apart from each other are provided. In the exterior sheet 20, since the curved elastic members 26 and 28 ensure the fit around the legs, the leg elastic members substantially continuous from the front body F to the back body B along the leg opening edge 29. Is not provided, but may be provided together with the curved elastic members 26 and 28.

  The waist elastic member 24 is a plurality of thread rubber-like elastic members disposed in the vertical direction near the waist opening edge in the vertical range having the side seal portions 21 and 22 and spaced in the vertical direction. It is intended to attach the waist opening edge of the diaper to the body by giving stretch force to tighten around the waist part of the body by being fixed to the exterior sheet in the stretched state in the present direction (width direction of the diaper) is there. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic member 24 of the illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the outer side layer 20B in a waist part, you may clamp between 20 A of inner side layers, and the outer side layer 20B.

  The waist elastic member 25 has a longitudinal direction with an interval in the vertical direction over a range from the upper part to the lower part in the longitudinal range corresponding to the side seal portions 21 and 22 and the range on the crotch side. The elastic body is an elongated elastic member such as a rubber thread disposed along the front and back of the front body F and the back body B by being fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper). It is intended to give the diaper tightly contact with the body by giving each of the surrounding parts a stretching force in the width direction. Note that the boundary between the waist elastic member 24 and the waist elastic member 25 is not necessarily clear. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the dorsal curved elastic member 26 disposed separately from the waist elastic member 25 has an acute angle crossing angle θ (hereinafter also referred to as a vertical crossing angle) with the vertical direction in the middle in the longitudinal direction. A predetermined curve having a minimum point that becomes the minimum and the longitudinal crossing angle θ increases within a range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded It is arranged along a predetermined curve having a crossing portion in which the vertical crossing angle θ is 60 degrees or less in a region overlapping with both side portions of the interior body 10, and the exterior sheet is stretched in the extending direction. It is fixed to. There may be one dorsal curved elastic member 26, but it is preferable that there are a plurality of dorsal curved elastic members 26. In the illustrated example, there are five elastic rubber-like elastic members, and these dorsal curved elastic members 26 intersect each other. There are no gaps. This dorsal curved elastic member group 26 is not arranged so that a few bundles of elastic elastic members of about two or three are closely packed, but a predetermined interval so as to form a predetermined elastic zone. Multiple or more are arranged with a gap.

  In the front body F, the ventral curved elastic member 28 disposed separately from the waist elastic member group 25 has a minimum point at which the longitudinal crossing angle θ with the vertical direction is minimum in the middle in the longitudinal direction, A predetermined curve in which the longitudinal crossing angle θ increases within a range of 0 to 90 degrees from the minimum point toward both sides in the width direction, and overlaps with both sides of the interior body 10 in a state where the diaper is unfolded It is arranged along a predetermined curve having a crossing portion in which the vertical crossing angle θ is 60 degrees or less, and is fixed to the exterior sheet in an extended state in the extending direction. There may be one ventral curved elastic member 28, but preferably there are a plurality of ventricular curved elastic members 28. In the illustrated example, there are five thread-like elastic members, and these ventral curved elastic members 28 do not cross each other. , Spaced apart. This abdomen curved elastic member group 28 is not arranged so that a few bundles of elastic stretch members are spaced substantially apart from each other, but a predetermined interval is formed so as to form a predetermined stretch zone. Multiple or more are arranged with a gap.

  The curved elastic members 26 and 28 do not have to be entirely curved as in the illustrated example, and may partially have linear portions. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, a part or all of the group of the curved elastic members 28 disposed on the front body F side and the back body B side are disposed. A form (not shown) in which a part or all of the group of the bent elastic members 26 intersects at the crotch part or in the vicinity of the front side or the rear side thereof can also be adopted, but it is arranged on the front body F side as in the illustrated example. The group of curved elastic members 28 and the group of curved elastic members 26 arranged on the back body B side do not cross each other, and are separated in the longitudinal direction at a position slightly deviated from the front-rear intermediate portion, particularly the front body F. The form which is carrying out is suitable and it is preferable that the vertical direction separation distance shall be about 10-20 mm.

  On the other hand, in the illustrated example, the waist elastic member 25 and the curved elastic members 26 and 28 arranged in the front body F and the back body B are not provided in a part of the interior body 10, and the part Is a non-stretchable region. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. FIG. 13 shows the latter example, in which the waist elastic member 25 and the curved elastic members 26, 28 are crossed from the side seal portion 22 on one side across the interior body 10 and the side seal portion 22 on the other (opposite) side. Are continuously provided, and then a part or all of the portion crossing the interior body 10 is cut by a predetermined cutting pattern CP so as to be discontinuous. By making the elastic members 25, 26 and 28 discontinuous at the portion overlapping the interior body 10, shrinkage in the width direction of the interior body 10 (particularly the absorber 13) can be prevented. Of course, the waist elastic member 25 can also be disposed continuously across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.

(Bent fit part)
As shown in detail in FIGS. 18 and 19, the exterior sheet 20 includes a side overlapping portion 41 in which portions on both sides in the width direction of the crack facing portion of the exterior sheet 20 of the back body B overlap with the side portions of the interior body 10. And a laterally extending portion 42 extending laterally from the side edge 10e of the interior body 10, and the back-side curved elastic member 26 extends from the right side seal portion of the back body B to the back body B To the right side overlapping portion 41 along the right leg opening edge 29, and further curved toward the front side while moving further toward the center side in the width direction from the right side overlapping portion 41 in the width direction of the rear body B It reaches the crack facing part located in the central part, is folded back to the rear side at the crack facing part, is further curved toward the left side toward the left side, and reaches the left side overlapping part 41, and is on the left side. The left leg opening edge 29 of the back body B from the overlapping part 41 It is fixed so as to reach the side seal portion of the left back body B along.

  Also, an elongated shape that extends from the side edge of one side extending portion 42 to the side edge of the other side extending portion 42 across the crack opposing portion and the side overlapping portions 41 on both sides thereof in the width direction. The elastic member 27 in the width direction of the crack portion is fixed to the exterior sheet 20 in a state of being stretched at a predetermined elongation rate in the extending direction.

  In the crack-opposing portion, the back-side curved elastic member 26 and the cracked-portion width direction elastic member 27 are finely divided by a predetermined cutting pattern CP only at the portion located on the center side in the width direction of the side overlap portion 41. The cracked portion width direction elastic member 27 is cut to be a non-shrinkable portion 43 on which no contractile force acts, and a main portion 44 located on the crack-opposing portion, a side overlapping portion 41 and a side extending portion. 42, an edge side portion 46 located on the outer side in the width direction of the boundary portion 45, and an intermediate portion 47 located between the boundary portion 45 and the non-shrinkable portion 43. Is fixed to the exterior sheet 20 at a low elongation rate.

  In the pants-type disposable diaper configured as described above, only the portion located on the center side in the width direction of the side overlapping portion 41 of the back side curved elastic member 26 and the cracked portion width direction elastic member 27 is finely cut. Since the portions which are not substantially contracted are formed, the facing portion between the cracks enters into the wearer's crack due to the contracting action of the cracked portion width direction elastic member 27 as shown in FIGS. 15 and 16. The shape (the inner surface of the diaper is raised in a ridge shape) is a bent fitting portion 40, and the inner body 10 fits to the bottom without unnecessarily shrinking in the central portion in the width direction of the side overlap portion 41. Become. On the side thereof, the contraction force of the cracked portion width direction elastic member 27 acts firmly on the boundary between the side overlapping portion 41 and the side extending portion 42 and in the vicinity of both sides in the width direction so that the inner body 10 side The edge fits well to the wearer's buttocks, and the shrinkage force acts weakly or substantially does not act on the outer part in the width direction (the state where the shrinkage force does not act at all, (Including a state where it is acting but not contracted), it is difficult for the edge of the leg opening to bend. Therefore, it is excellent in the rupture and fit on both sides in the width direction, and the edge of the leg opening in the back body B is difficult to bend. Moreover, since the cracked portion width direction elastic member 27 is provided along the width direction, it can be manufactured not only at a low cost but also stably by a high-speed line.

  Although the elongation rate of each part of the crack part width direction elastic member 27 can be determined as appropriate, the main part 44 and the boundary part 45 are preferably 200 to 240%, and the edge part 46 and the intermediate part 47 are 100 to 140. % Is preferable.

  A method for attaching the cracked portion width direction elastic member 27 having such a difference in elongation rate is not particularly limited, but when manufactured using existing technology, it is preferably applied as shown in FIGS. 12 and 18. That is, when the cracked portion width direction elastic member 27 is supplied at a higher elongation rate and fixed to the exterior sheet 20, the amount of hot melt adhesive G2, G3 applied between the outer layer 20B and the inner layer 20A is set. The edge portion 46 and the intermediate portion 47 are less than the main portion 44 and the boundary portion 45, and thereafter, the side overlapping portion 41 of the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27 is reduced. A method is proposed in which only the portion located on the center side in the width direction is finely cut and the end of the crack width direction elastic member 27 is cut by punching the leg opening. Thereby, while the main part 44 and the boundary part 45 of the crack part width direction elastic member 27 are fixed with respect to the exterior sheet 20 by the elongation rate at the time of supply by hot-melt adhesive G2, G3 of sufficient application quantity, As a result of the edge-side portion 46 and the intermediate portion 47 of the crack width-direction elastic member 27 being weakly fixed by the hot-melt adhesive G3 with a small coating amount, the edge-side portion 46 and the intermediate portion 47 are contracted to some extent and drawn toward the boundary portion 45. It becomes fixed at a lower elongation rate. The crack part width direction elastic member 27 can be attached at the same time by the same method as the waist elastic member 25 except that the hot melt adhesive G2 is intermittently applied.

  The method for providing the difference in the application amount of the hot melt adhesive is not particularly limited. As will be described later, when fixing the cracked portion width direction elastic member 27 to the exterior sheet 20, the cracked portion width direction elastic member 27 is attached to the outer periphery thereof. When the method of directly applying the hot melt adhesive G2 to the surface and then fixing to the exterior sheet 20 is adopted, the hot melt adhesive G2 is intermittently applied in the longitudinal direction of the cracked portion width direction elastic member 27. (In other words, the hot melt adhesive G2 is applied to the portions to be the main portion 44 and the boundary portion 45, and the hot melt adhesive is not applied to the portions to be the edge side portion 46 and the intermediate portion 47). A difference in the amount of melt adhesive applied, and thus the above-described difference in elongation can be achieved.

  Although the width of each part can be determined as appropriate, in the normal case, the width of the crack facing part is about 0.15 to 0.40 times the width 10X of the interior body 10, and the side overlapping portion 41 is the width of the interior body 10. 10X is about 0.05 to 0.20 (only on one side), the laterally extending portion 42 is about 0.05 to 0.35 (only on one side) times the width 10X of the interior body 10, and the non-shrinkable portion 43 is on the interior. The width 10X of the body 10 is about 0.25 to 0.40 times (one side only), the main portion 44 is about 0.10 to 0.40 times the width 10X of the interior body 10, and the boundary portion 45 is the width of the interior body 10. 10X is about 0.05 to 0.20 times (only one side), the edge portion 46 is about 0.05 to 0.10 times (one side only) the width 10X of the interior body 10, and the intermediate portion 47 is about the interior body 10. The width can be about 0.05 to 0.15 times the width 10X (one side only).

  The contraction force acting portion (the central region in the width direction left without cutting the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27) of the crack facing portion is a rectangular shape extending in the front-rear direction or toward the front side. The width may increase in shape (for example, an isosceles triangle shape whose base is located on the front side, or a trumpet shape whose isosceles side is a curve), but from the front end to the middle in the longitudinal direction If it has a shape in which the width increases toward the side, and further on the rear side, the width decreases toward the rear side, a bent fitting portion 40 that fits particularly well against a crack is formed. Therefore, it is preferable.

  Although the size of the contraction force acting portion of the crack facing portion can be determined as appropriate, the width is narrower than the interior body 10, for example, preferably about 0.15 to 0.40 times the width 10X of the interior body 10. The length in the front-rear direction is preferably about 1/5 to 1/2 of the length in the front-rear direction of the interior body 10. Moreover, it is preferable that the front end is located in the front-back direction center or its vicinity. The non-cut portion NC in the above-described cutting pattern has the same shape as the contraction force acting portion and has the same or slightly larger dimensions. In addition, the length and width of the groove 13D or slit provided in the absorber 13 in the front-rear direction may be shorter, longer, or the same as the contraction force acting part, but the width is less than the contraction force acting part. It is preferable to do this.

(Fixing of the interior body 10 and the exterior sheet 20)
As shown in FIG. 8 and FIG. 10, the inner body 10 can be applied to the appropriate regions 81 to 83 on the back surface of the inner body 10 and fixed to the inner surface of the exterior sheet 20. Thus, from the viewpoint of improving the followability of the interior body 10 to the movement of the legs, the width of the fixing region 81 in the crotch portion is preferably narrowed, for example, about 30 to 45% of the width 10X of the interior body 10, It is preferable that the fixing regions 82 and 83 on both the front and rear sides of the crotch portion are widened to fix the interior body 10 firmly, and in particular, extend to the vicinity of both side edges.

  The fixed regions 81 to 83 having such a shape are coated with a plurality of rows of hot melt adhesives G in the width direction, continuously in the front-rear direction at the intermediate portion, and intermittently at both sides (applied at the crotch portion). Without), each can be formed by coating.

  However, when the width of the fixed region 81 in the crotch portion is narrowed, if the narrow region is excessively extended rearward, there are the following problems. That is, in order to pull up the crotch portion backward by the dorsal curved elastic member 26, a plurality of dorsal curved elastic members 26 and cracked portion width direction elastic members 27 are provided at intervals, and at least one dorsal curved portion is provided. It is preferable that the elastic member 26 is disposed so as to bulge to the front side of the cracked portion width direction elastic member 27 located on the most front side. However, in that case, a region 84 on the outer side in the width direction of the back-side curved elastic member 26 located on the foremost side of the exterior sheet 20 and on the front side of the cracked portion width-direction elastic member 27 located on the most front side is formed in the interior body 10. If it is not fixed, the edge of the leg opening in the region 84 is likely to bend outward. Therefore, in the present embodiment, the region 81 having a narrow adhesive width in the crotch portion is not excessively extended to the rear side, and the fixed region 83 having a wide rear portion is provided on the back side of the exterior sheet 20 so as to be curved. It extends to the region 84 on the outer side in the width direction of the member 26 and on the front side of the cracked portion width direction elastic member 27 located at the foremost side so as to fix the region 84 to the interior body 10 and prevent the dripping. It is configured.

(Balance of tensile stress during longitudinal elastic deformation)
Further, in order to improve the fit of the crack facing portion, the longitudinal contraction force in which the tensile stress in the longitudinal direction in the front body F is larger than the tensile stress in the longitudinal direction in the longitudinal direction in the back body B. A balance is preferred. In the illustrated example, in the front body F and the back body B, curved elastic members 26 and 28 are provided as pulling elastic members that exert a contraction force of a longitudinal component so as to lift the crotch portion toward the waist, and the front-rear contraction force is provided. Due to the balance, the tensile stress at the time of elastic deformation in the front body F is larger than the tensile stress at the time of elastic deformation in the rear body B. The tensile stress at the time of elastic deformation is the tensile test of the waist opening edge part of the body part to be measured and the crotch side end part of the opposite body part not to be measured, after peeling off both side seal parts 21 and 22 of the diaper and making them unfolded. It can be measured by holding each with a machine chuck and performing a tensile test. The difference in tensile stress at the time of elastic deformation can be determined appropriately, but the tensile stress at the time of elastic deformation in the longitudinal direction when the front body F is 80% elongated (when the elastic limit elongation (strain) is 100%) is It is preferably about 1.1 to 1.2 times that of the body B. As can be seen from this, the magnitude of the tensile stress at the time of elastic deformation is the same at the same elongation (when the elastic limit elongation is 100%, the elongation is preferably in the range of 65 to 95%). Means.

  If the pulling elastic members 26 and 28 are provided on the front body F and the back body B in this way, and the tensile stress at the time of elastic deformation in the longitudinal direction in the front body F is made larger than that of the back body B, FIGS. As shown in FIG. 2, in the mounted state, the crotch part of the diaper is lifted while moving forward, by the contraction force of the pulling elastic member 28 of the front body F against the contraction force of the pulling elastic member 26 of the back body B. As a result, the front end portion of the bent fitting portion 40 is pulled forward, and as a result, the bent fitting portion 40 fits into the crack while maintaining its bent state. Therefore, while fitting well from a rupture to a crotch, the fit follows the movement of a body and is maintained elastically, and a crotch part becomes difficult to mokomoko at the time of mounting | wearing. On the other hand, in a general pants-type disposable diaper, as shown in FIG. 17, as a result of the ruptured opposing part bulging and being largely separated from the skin, the crotch part is mokomoko, which is significantly different from ordinary underwear. Occurs.

  In the illustrated example, the pulling elastic member is composed of only the curved elastic members 26 and 28. The curved elastic members 26 and 28 have a function of improving the fit to the buttock in the front body F and improving the fit to the bulge of the buttock in the rear body B. Of course, instead of or together with the curved elastic members 26 and 28, an elastic member such as an elongated shape or a sheet shape may be fixed in an elongated state along the longitudinal direction at the intermediate portion in the width direction, and may be used as a lifting elastic member (not shown). ). When the curved elastic members 26 and 28 are used in combination with other types of pulling elastic members, unlike the illustrated example, the curved elastic members 26 and 28 are provided only on one of the front body F and the back body B, and the other It is also possible to simply provide another pulling elastic member.

  In particular, when the curved elastic members 26 and 28 as shown in the illustrated example are provided, the longitudinal interval of the curved elastic members 26 in the back body B is the curve in the front body F at a portion outside the side edge of the interior body 10 in the width direction. When the elastic member 28 is arranged wider than the vertical interval, the curved elastic member 28 of the front body F exhibits a fitting property that enters the buttocks, and the curved elastic member 26 of the back body B bulges the buttocks. This is preferable because not only a fit property that can be wrapped is exhibited, but also when the bent fit portion 40 fits into a crack while maintaining its bent state, it is difficult to cause a situation of biting into the crack. .

  The aforementioned front-rear contraction force balance makes at least one of factors such as the thickness, elongation rate, number, etc. of the elastic members 26, 28 of the pulling elastic members 26, 28 different in the front-rear direction. Can be realized. When adjusting the thickness and the like of the pulling elastic members 26 and 28, the number of the pulling elastic members 26 and 28 is preferably determined according to the size and arrangement of the diaper. It is preferable that at least one of the thickness and the elongation rate is such that the front body F is thicker or higher than the back body B so that a balance of contraction force is obtained.

Specifically, in the illustrated example, it is preferable to define the specifications of each part within the following range. Although the unit of thickness of the elastic member is unified to dtex, it is not limited to synthetic rubber, and natural rubber can be used. The unit dtex when natural rubber is used is the synthesis of the dtex. This means the thickness of natural rubber having an SS curve equivalent to that of rubber (eg, 0.5 mm to 3.0 mm when natural rubber is used for the waist elastic member 24).
・ Exterior sheet 20
Material: Non-woven fabric Basis weight: 30-75 g / m ² , especially 36-60 g / m ²
-Waist elastic member 24 of front body F and back body B
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex
Number: 5-10, especially 8-10 (each body)
Spacing: 0-5mm, especially 3-5mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 around the waist of the front body F
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-26, especially 8-16 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 of the waist part of the back body B
Thickness: 470-1,240 dtex, especially 470-620 dtex
Number: 6-24, especially 9-14 Interval: 10-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Rupture width direction elastic member 27
Thickness: 470 to 1,240 dtex, especially 940 to 1,240 dtex
Number: 5 to 20, especially 9 to 10 Spacing: 5 to 20 mm, especially 10 to 16 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 330%
-Curved elastic member 28 of front body F
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate at the time of fixation: 230 to 380%, particularly 300 to 380%, and higher elongation rate than the curved elastic member 26 of the back body B. The curved elastic member 26 of the back body B
Thickness: 620-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%

(Configuration for exterior sheet flexibility)
The longitudinal range having the waist elastic member 25 and the longitudinal range 31 having the curved elastic members 26 and 28 partially (or all) overlap, and the waist elastic member 25 is in the overlapping range 30. Are included (for example, about 5 to 10), and the mutual distance d1 of at least some of the waist elastic members 25 is preferably larger than the mutual distance d2 of the other waist elastic members 25. . Further, even outside the overlapping range 30, a plurality of waistline elastic members 25 are provided in an intermediate range 32 between the vertical range 31 having the curved elastic members 26 and 28 and the vertical range having the waist elastic member 24 ( For example, about 10 to 16 are preferably provided.

  In this manner, while allowing a certain overlap range 30 between the longitudinal range having the waist elastic member 25 and the longitudinal range having the curved elastic members 26 and 28, the mutual spacing of the waist elastic members 25 is within that range. By providing the wide portion, it is possible to suppress the denseness of the elastic member without impairing the fit. As a result, the pleats are not concentrated on the exterior sheet 20 in the overlapping range 30, an unnecessary increase in thickness, the elastic member itself and hardening due to its adhesion are suppressed, and a flexible and comfortable wearing feeling can be obtained. Become.

  In a normal case, it is preferable that the mutual interval d1 of the waist elastic members 25 is about 15 to 50 mm, and the mutual interval d2 of the other waist elastic members 25 is about 10 to 20 mm. Moreover, it is preferable that the longitudinal length of the overlapping range 30 is about 15 to 30% of the total length of the diaper in the unfolded state, and the ratio of the wide spacing portions 35 of the waist elastic members 25 in the overlapping range 30 Is preferably about 60 to 100% in the ratio of the length in the vertical direction (that is, the sum of the distances d1 / the vertical length of the overlapping range 30). If the overlapping range 30 is too narrow, the significance of widening the interval between the waist elastic members 25 is reduced. If it is too wide, the wide portion 35 of the waist elastic members 25 is increased, resulting in a decrease in fit. Further, if the proportion of the portion 35 having a wide interval between the waist elastic members 25 occupying the overlap range 30 is too small, improvement in flexibility can be expected, but remarkable improvement becomes difficult.

  Specifically, in the case of the illustrated example, the ratio of the wide portion 35 of the waist elastic member 25 occupying the overlapping range 30 with the wide interval d1 is about 40% for the front body F and 100% for the back body B. As described above, the configuration relating to the improvement in flexibility can be made different between the front body F and the back body B, and can be applied only to either the front body F or the back body B in the exterior sheet 20. (same as below).

  On the other hand, the waist elastic member 24, the waist elastic member 25, the crack width elastic member 27, and the curved elastic members 26 and 28 are sandwiched between a pair of sheet layers 20A and 20B constituting the exterior sheet 20. The sheet layers 20 </ b> A and 20 </ b> B are bonded and fixed by a hot melt adhesive, and the adhesive application amount greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 12, the application portions G1 to G3 of the adhesive include the arrangement portion of the waist elastic member 24 and the vicinity thereof, the arrangement portion of the waist elastic member 25 and the vicinity thereof, and the elasticity in the width direction of the crack portion. Areas where the member 27 is arranged and its vicinity, areas where the curved elastic members 26 and 28 are arranged, and their vertical and horizontal distances a (normally within ± 25 mm, more preferably within ± 10 mm, particularly preferably within ± 5 mm) It is preferable that no adhesive be applied between the two sheet layers other than these adhesives. In this way, by reducing the adhesive application portions G1 to G3 as much as possible, hardening by the adhesive can be suppressed in each stage. In addition, when this is combined with the increase in the local spacing of the waist elastic member 25 described above, a greater flexibility improvement effect than expected can be obtained.

  FIG. 12 shows application sites G1 to G3 of the hot melt adhesive in the manufacturing process, and the curved elastic members 26 and 28 show a state before cutting a portion crossing the interior body 10 as indicated by a two-dot chain line. ing. An adhesive G1 for fixing the waist elastic member 24 and the waist elastic member 25 to the two sheet layers 20A and 20B, and an adhesive G2 for fixing the cracked part width direction elastic member 27 to the two sheet layers 20A and 20B are as follows. It is applied substantially only to the arrangement site of each elastic member 24, 25 and its vicinity. Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to a Nordson Surerup nozzle.

  On the other hand, the adhesive G3 for fixing the curved elastic members 26, 28 to the two sheet layers 20A, 20B has a rectangular adhesive application portion B2 arranged side by side along the bending direction of the curved elastic members 26, 28. As a result, the adhesive is applied only to the arrangement portions of the curved elastic members 26 and 28 and the regions within the predetermined distances a in the vertical and horizontal directions throughout the longitudinal direction of the curved elastic members 26 and 28. In the application process, in the normal form in which the lateral direction (diaper width direction) of the sheet layers 20A and 20B is along the line MD direction (flow direction) in the application process, the adhesive layer crosses the line CD direction (MD direction). In the direction), a plurality of slot coating nozzles are arranged in parallel, and the adhesive can be applied independently and intermittently from each nozzle.

(Structural example of interior body)
As shown in FIGS. 9 to 11, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  In addition, the above-mentioned bending fitting part 40 can also assist the formation by providing a groove 13D or a slit along the longitudinal direction in the crack-opposing part of the absorbent body 13, and in that case, bending at an appropriate position as a fold. The fitting part 40 is formed and the shape thereof is easily maintained.

  An outer three-dimensional gather BS that fits around the legs is formed on both sides of the interior body 10. The outer three-dimensional gather BS has a strip-shaped gather sheet 15 having a length equal to the length in the front-rear direction of the interior body 10 folded in the width direction and folded in two, and is elongated between the folded portion and the nearby sheet. A plurality of the elastic elastic members 16 are fixed along the longitudinal direction at intervals in the width direction. In addition, the outer three-dimensional gather BS has a root portion in which a base end portion (an end portion on the opposite side to the sheet folding portion in the width direction) located on the side opposite to the front end portion is fixed to the back surface of the side edge portion of the interior body 200. A portion other than the root portion is a protruding portion (a portion on the folded portion side) extending from the root portion around the side edge of the interior body 200 toward the surface side. In the lying state, it is a lying portion fixed to the side surface of the topsheet 11 by hot melt adhesive or heat sealing, while the front-rear intermediate portion located between them is an unfixed free portion. The elongated elastic member 16 extending in the front-rear direction is fixed to the free portion in an extended state. Due to the elastic contraction of the elongated elastic expansion / contraction member 16, the free portion of the outer three-dimensional gather BS rises as shown by a two-dot chain line in FIG. 10 in the product state. As shown in FIG. 20, the protruding portion of the outer three-dimensional gather BS can be folded back outward in the width direction on the surface side, and both front and rear direction end portions can be fixed to the side surface of the topsheet 11 in a lying state.

  The liquid-impermeable back sheet 12 enters the inside of the double sheet-like gather sheet 15 and constitutes a leak-proof wall on the lower end side of the outer three-dimensional gather BS as shown in FIG. Yes. As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the elongated elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. Moreover, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the elongation is 150 to 350%, and the interval is 7.0 mm or less. In place of the elongated elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gather sheet 15 is made of synthetic fibers such as polyethylene or polypropylene such as olefin, polyester or amide, recycled fibers such as rayon or cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gather sheet 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to improve the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic chromoid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Front / rear presser sheet)
As shown in FIGS. 6 and 9, in order to cover the front and rear ends of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion of the front body F to the position overlapping the front end portion of the interior body 10. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

  The present invention can be used for a pad-type disposable diaper.

  B ... Back body, F ... Front body, 1 ... Outer disposable diaper, 10 ... Interior body, 11 ... Liquid permeable top sheet, 12 ... Liquid impervious back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gather sheet, 16 ... Elongated elastic expansion / contraction member, 20 ... Exterior sheet, 20C ... Exterior sheet folded portion, 21, 22 ... Side seal portion, 24 ... Waist elastic member, 25 ... Hip elastic member, 26 ... Back side Curved elastic member, 27 ... crack width elastic member, 28 ... ventral curved elastic member, 29 ... leg opening edge, 41 ... side overlapping part, 42 ... side extension part, 43 ... non-shrinking part, 44 ... Main part, 45 ... Boundary part, 46 ... Edge side part, 47 ... Edge side part, 81-83 ... Fixed area, BS ... Outer solid gather, 200 ... Pad type disposable diaper, 221 ... Liquid impervious sheet, 222 ... 223 ... Absorber, 223n ... Constricted part, 224 ... Inner solid gather, 224s ... Gather sheet, 225 ... Intermediate sheet, 226 ... Packaging sheet, 230 ... Main absorbent part, 231 ... Side absorbent part, 232 ... Inner flexible ,..., Outer easily bendable portions, 235, 238... Inner elastic bendable portions, 236.

Claims (5)

A liquid-permeable top sheet forming the surface, a liquid-impermeable sheet located on the back side, an absorbent body interposed therebetween, and an inner three-dimensional gather projecting to the front side with both sides of the surface as root parts With
In the pad-type disposable diaper used to lay on the inner surface of the outer disposable diaper with outer three-dimensional gathers projecting to the front side with both sides of the surface as the root part,
A main absorbent part located in the middle of the width direction and containing the absorber;
A pair of left and right inner easily bent portions extending in the front-rear direction, each provided along both side edges of the main absorbent portion;
A pair of left and right outer easily bent portions extending in the front-rear direction provided at intervals on the outer sides in the width direction of these inner easily bent portions,
A side absorption part containing the absorber, provided on the outer side in the width direction of these outer easily bent parts and on the center side in the width direction than the root part of the inner three-dimensional gather,
A portion between the inner easily bent portion and the outer easily bent portion stands together with the outer three-dimensional gather located on the back side due to the bending of the inner easily bent portion, and the side absorbent portion has the outer easily bent portion. It is configured not to stand by bending of
A pad-type disposable diaper characterized by that. The portion between the inner easily bent portion and the outer easily bent portion is a non-absorbent region that does not incorporate the absorber,
The inner easily bent portion is formed by the boundary between the region where the absorber of the main absorbent portion is incorporated and the non-absorbent region,
The outer easily bent portion is formed by the boundary between the region where the absorber of the side absorbent portion is incorporated and the non-absorbent region.
The pad type disposable diaper according to claim 1.   The portion between the inner easily bent portion and the outer easily bent portion is folded onto the main absorbent portion and joined to the surface of the main absorbent portion in a lying state at each position on the front side and the rear side from the crotch portion. The pad-type disposable diaper according to claim 1, wherein the pad-type disposable diaper is configured to stand between the joined portions.   The pad-type disposable diaper according to claim 3, wherein an elongated elastic elastic member is fixed in an extended state along the front-rear direction to an end of the side absorbent portion on the outer easily bent portion side.   The pad-type disposable diaper according to claim 3 or 4, wherein at least one of the main absorbent portion and the side absorbent portion does not incorporate the absorbent body in a portion where the main absorbent portion and the side absorbent portion overlap in the lying state. .

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