HK1197172B - Absorptive article - Google Patents

Abstract

A disposable pull-up diaper (1) is provided with: a pair of band-shaped protrusions (13) protruding sideways from connecting lines along which a front section and a rear section, which are located on the belly side and back side of the wearer, are connected together; first waist elastic members (443) joined to first waist regions (407) which are the upper parts of waist regions (406) extending along a waist opening; and second waist elastic members (444) joined to second waist regions (408) which are the lower parts of the waist regions (406). In a state in which an outer cover sheet (4) is stretched in the left-right direction, a first unit contraction force in the first waist regions (407), the first unit contraction force being a contraction force in the left-right direction per unit width of the first waist regions (407) in the vertical direction, is less than a second unit contraction force in the second waist regions (408). The configuration can prevent the upper ends of the pair of band-shaped protrusions (13) from biting into the skin of the wearer and can prevent the disposable diaper (1) from being displaced in the vertical direction while the disposable diaper (1) is worn.

Description

Absorbent article

Technical Field

The present invention relates to a pants-type absorbent article

Background

A pants-type disposable diaper having a waist opening at an upper end and a pair of leg openings at a lower portion has been conventionally used as one of absorbent articles for receiving excrement from a wearer. In a pants-type disposable diaper, waist elastic members along the edges of a waist opening are provided in front and rear portions located on the abdomen and back of a wearer. Further, leg elastic members are provided along the edges of the pair of leg openings in the crotch portion between the front portion and the rear portion. An intermediate elastic member is further provided between the waist elastic member and the leg elastic members in the vertical direction at the front portion and the rear portion.

In a pants-type disposable diaper disclosed in jp 2009-240694 a (document 1), a front portion and a rear portion located on the abdomen side and the back side of a wearer are divided into a 1 st stretch region near an edge portion of a waist opening, a 2 nd stretch region adjacent to the 1 st stretch region and crossing a front end portion of an absorbent chassis (シャーシ), and a 3 rd stretch region adjacent to the 2 nd stretch region and located on both sides of the absorbent chassis. When the tensile stress in the 2 nd expansion region is equal to or higher than the tensile stress in the 1 st expansion region, the occurrence of a fold (folding り) in the 2 nd expansion region and the distal end portion of the absorbent chassis due to the influence of the stretching in the 1 st expansion region when the wearer bends forward is suppressed.

In the pant-type absorbent articles of japanese patent laid-open publication No. 2009-125088 (document 2) and 2009-125087 (document 3), the front portion and the rear portion are divided into 4 belt-like regions of the same width extending in the width direction, and the 1 st region, the 2 nd region, the 3 rd region, and the 4 th region are provided from the upper side. In the pant-type absorbent article of document 2, the contraction force of the 2 nd region is greater than the contraction force of the 1 st region and the contraction force of the 3 rd region, and the contraction force of the 4 th region is greater than the contraction force of the 3 rd region, with respect to the contraction force of each region. In this way, the contraction force in the 2 nd region and the 4 th region where the wearer's bones protrude from the body surface is set high to suppress the slipping-off of the absorbent article (ずれ drop ち), and the contraction force in the 1 st region where the fluctuation due to the wearer's motion is large is set low to improve the wearing feeling. In addition, in document 3, in order to provide a pants-type disposable diaper excellent in slip prevention performance and wearing feeling, the average contraction force of the 2 nd region and the 4 th region is larger than the average contraction force of the 3 rd region, the contraction force of the 4 th region on the abdomen side is larger than the contraction force of the 4 th region on the back side, and the average contraction force of the 2 nd region is larger than the average contraction force of the 1 st region.

In the disposable diaper disclosed in jp 2010-69023 a (document 4), the front portion is divided into the 1 st, 2 nd and 3 rd stretch zones from the waist opening side, and the rear portion is divided into the 4 th, 5 th and 6 th stretch zones from the waist opening side, and the correlation of the tensile stress in each stretch zone is as follows: the number 6 is greater than the number 2 is greater than the number 3 is greater than or equal to the number 5 is greater than the number 1, and the number 6 is greater than the number 2 is greater than the number 3 is greater than or equal to the number 5 is greater than the number 4.

In the pants-type disposable diaper disclosed in Japanese patent laid-open No. 2001-178770 (document 5), the front portion and the rear portion are divided into a waist section, a rib upper section and a rib lower section from the waist opening side, and the elastic stretchability of each section is defined as rib lower section ≧ rib upper section > waist section.

In a pants-type disposable diaper disclosed in jp 2006-61682 a (document 6), when worn, the pressure in the 1 st region between the waist opening and the leg openings is highest, the pressure in the waist opening is the second highest, and the pressure in the 2 nd region between the 1 st region and the leg openings is lowest. This effectively prevents the diaper from slipping off during wearing, and also effectively prevents liquid leakage by bringing the diaper into close contact with the body of the wearer without giving a sense of discomfort.

However, in a pants-type disposable diaper, when the front portion and the rear portion are joined on both the left and right sides, a pair of belt-shaped protruding portions that protrude laterally from a connecting line between the front portion and the rear portion are formed. The belt-like projection is formed by joining sheet members such as nonwoven fabrics after lamination by thermocompression bonding or the like, and therefore, the belt-like projection is less flexible than other portions of the disposable diaper. Therefore, when the disposable diaper is worn, the upper end portions of the belt-like protrusions may be pulled into the body of the wearer by contraction of the waist elastic member provided in the waist region along the edge of the waist opening, which may cause the wearer to feel uncomfortable.

On the other hand, documents 1 to 6 propose that the contraction force of the waist region is made smaller than that of the other regions, but in order to prevent the disposable diaper from slipping off the wearer, it is necessary to maintain the magnitude of the contraction force of the waist region at a certain level or more. Therefore, in the configurations of documents 1 to 6, the upper end portion of the band-shaped protrusion tends to bite into the wearer.

Disclosure of Invention

The present invention is directed to a pants-type absorbent article, and aims to prevent the upper end of a belt-like projection from slipping into the wearer.

The absorbent article of the present invention includes: an outer sheet having a waist opening at an upper end thereof and a pair of leg openings at a lower portion thereof; an absorbent body which is attached to a wearer side of the exterior sheet and absorbs excrement from the wearer, the exterior sheet having: a front portion located on a ventral side of a wearer; a rear portion which is located on the back side of the wearer and has both side ends connected to both side ends of the front portion; a lower crotch portion continuous with the front portion and the rear portion; a pair of belt-shaped protruding portions formed by joining inner surfaces of portions laterally continuous from both side ends of the front portion and inner surfaces of portions laterally continuous from both side ends of the rear portion, each of the belt-shaped protruding portions having a belt shape extending in the vertical direction and protruding laterally from a connecting line between the front portion and the rear portion; a waist elastic member joined to the front portion and the rear portion in a waist region along an edge of the waist opening, and forming a waist opening gather by contraction of the waist elastic member; a leg elastic member joined to the crotch portion along edges of the pair of leg openings and forming a pair of leg opening gathers by contraction of the leg elastic member; an intermediate elastic member that is joined to the front portion and the rear portion between the waist elastic member and the leg elastic members in the vertical direction and that forms an intermediate gather by contraction of the intermediate elastic member, the waist elastic member comprising: a 1 st waist elastic member disposed in a 1 st waist region which is an upper portion of the waist region so as to be substantially parallel to the edge of the waist opening; and a 2 nd waist elastic member disposed in a 2 nd waist region which is a region of the waist region which is a lower side of the 1 st waist region and is substantially parallel to the 1 st waist elastic member, wherein in a state where the outer covering sheet is stretched in a left-right direction perpendicular to the up-down direction, a 1 st unit contraction force which is a contraction force in the left-right direction per unit width in the up-down direction in the 1 st waist region is smaller than a 2 nd unit contraction force which is a contraction force in the left-right direction per unit width in the up-down direction in the 2 nd waist region.

In the present invention, the upper end portion of the band-shaped protrusion can be prevented from slipping into the wearer.

Preferably, the waist region is located above an upper end of the absorber, or the width of the waist region in the vertical direction is 50mm or less.

In a preferred aspect of the present invention, the outer sheet has a folded-back portion folded back toward the wearer side at the edge of the waist opening, and the waist elastic member is disposed between a portion of the outer sheet facing the folded-back portion and the folded-back portion. Thus, the upper end of the band-shaped protruding portion becomes a fold of the continuous sheet member, and the upper end of the band-shaped protruding portion can be more suppressed from being caught in the skin of the wearer than in the case of forming a cut edge of the sheet member.

In another preferred embodiment of the present invention, the waist region is formed by stacking a plurality of sheet members, and the number of layers of the sheet members in the 1 st waist region is smaller than the number of layers of the sheet members in the 2 nd waist region. This can further prevent the upper end of the band-shaped protrusion from biting into the skin of the wearer.

In one aspect of the present invention, in the exterior sheet, an auxiliary region is provided between the 2 nd waist region and an intermediate elastic region in which the intermediate elastic member is disposed, and in a state where the exterior sheet is stretched in the left-right direction, a contraction force in the left-right direction per unit width in the up-down direction in the auxiliary region is smaller than any one of a contraction force in the left-right direction per unit width in the up-down direction, the 1 st unit contraction force, and the 2 nd unit contraction force in the intermediate elastic region. This makes it possible to easily hook the finger tips deeply into the auxiliary region to firmly grip the absorbent article, and to easily move the absorbent article along the body of the wearer.

The above and other objects, features, aspects and advantages will become apparent from the following detailed description of the present invention with reference to the accompanying drawings.

Drawings

Fig. 1 is a front view of a disposable diaper according to an embodiment.

Fig. 2 is a rear view of the disposable diaper.

Fig. 3 is a plan view of the disposable diaper in an unfolded state.

Fig. 4 is a cross-sectional view of a disposable diaper.

Fig. 5 is a partial cross-sectional view of a disposable diaper.

Detailed Description

Fig. 1 and 2 are a front view and a back view (i.e., views of portions on the ventral side and the dorsal side of a wearer) of a disposable diaper 1 according to an embodiment of the present invention, respectively. As shown in fig. 1 and 2, the disposable diaper 1 is a pants-type absorbent article having a waist opening 11 at an upper end (i.e., an upper end in fig. 1 and 2) and a pair of leg openings 12 at a lower portion, and receives excrement from a wearer.

Fig. 3 is a plan view of the disposable diaper 1 in a developed state, as viewed from the wearer side. The disposable diaper 1 includes: an outer sheet 4 having a waist opening 11 and a pair of leg openings 12 (see fig. 1 and 2); a substantially sheet-like absorbent body 20 attached to the inner surface (i.e., the wearer-side surface) of the outer sheet 4 and used for absorbing excrement from the wearer. The outer sheet 4 has an outer sheet main body 40, and leg elastic members 43, waist elastic members 44, and intermediate elastic members 45 joined to the outer sheet main body 40.

In the disposable diaper 1, the upper portion in fig. 3 covers the front side (skin on the abdominal side) of the wearer, and the lower portion in fig. 3 covers the back side (skin on the back side) of the wearer. In the following description, the portions of the exterior sheet main body 40 located on the abdomen side and the back side of the wearer are referred to as "front portion 401" and "back portion 403", respectively, and the portion that is continuous with the front portion 401 and the back portion 403 between the front portion 401 and the back portion 403 and covers the crotch portion of the wearer is referred to as "crotch portion 402". In the disposable diaper 1, the outer sheet 4 has a front portion 401, a crotch portion 402, and a rear portion 403, and the absorber 20 reaches the rear portion 403 from the front portion 401 of the outer sheet 4 through the crotch portion 402.

When the disposable diaper 1 is manufactured, the outer sheet 4 is folded together with the absorber 20 in the crotch portion 402, and the inner surfaces of the band-shaped portions 404 located on the left and right sides of the front portion 401 and the inner surfaces of the band-shaped portions 405 located on the left and right sides of the rear portion 403 when the crotch portion 402 is oriented downward are joined together by thermal fusion by heating and pressing. The inner surface of the band-shaped portion 404 is a surface that is continuous laterally from both side ends of the inner surface, which is a surface of the front portion 401 that contacts the wearer, and is a front surface in fig. 3. The inner surface of the band-shaped portion 405 is a surface that is laterally continuous from both side ends of the inner surface that is a surface of the rear portion 403 that contacts the wearer, and is a front surface in fig. 3.

As a result of the pair of belt-like portions 404 and the pair of belt-like portions 405 being joined together in this way, both side ends of the front portion 401 and both side ends of the rear portion 403 are connected together, and the waist opening 11 is formed at the upper ends of the front portion 401 and the rear portion 403, as shown in fig. 1 and 2. Further, a pair of leg openings 12 are formed on the left and right of the crotch portion 402 below the front portion 401 and the rear portion 403, and a pair of belt-like projections 13 extending in the up-down direction are formed between the waist opening 11 and the pair of leg openings 12, respectively. Each of the band-shaped protruding portions 13 is a band-shaped portion protruding laterally from the connecting line 400 between the front portion 401 and the rear portion 403.

Fig. 4 is a cross-sectional view of the disposable diaper 1 cut at a position IV-IV (i.e., the crotch portion 402) shown in fig. 3. Fig. 4 shows the respective components of the disposable diaper 1 separately for convenience of illustration. As shown in fig. 3 and 4, the absorbent body 20 includes a substantially sheet-like main body 2 and a pair of side sheets 3 disposed on both side portions of the main body 2 (i.e., on both sides in the left-right direction perpendicular to the up-down direction) over substantially the entire length of the main body 2 in the longitudinal direction. As shown in fig. 4, the main body portion 2 has a top sheet 21, a back sheet 23, and an absorbent core 22 disposed between the top sheet 21 and the back sheet 23. In fig. 3, the absorbent core 22 of the absorbent body 20 is outlined with a thick dashed line for easy understanding of the drawing (the same applies to fig. 1 and 2).

As shown in fig. 3, the width of both end portions in the longitudinal direction of the absorbent core 22 is larger than the width of the central portion in the longitudinal direction of the absorbent core 22. In other words, the absorbent core 22 is of the so-called hourglass type. The back sheet 23 in fig. 4 is bonded to the outer sheet 4 with a hot melt adhesive or the like, and the absorbent body 20 is fixed to the outer sheet 4.

As shown in fig. 4, each of the pair of side sheets 3 has a band-shaped joint portion 33 and a side wall portion 34, the band-shaped joint portion 33 being a portion on one side of a bending line 39, the side wall portion 34 being a portion on the other side of the bending line 39, and the bending line 39 extending over the entire length in the longitudinal direction. The pair of joining portions 33 are joined to the upper side (i.e., the wearer side) of the main body portion 2 over substantially the entire length in the longitudinal direction in the vicinity of the side edges of the main body portion 2 with a hot-melt adhesive. The pair of side wall portions 34 are continuous portions with the pair of joining portions 33 at the bending line 39, i.e., the outer edges of the joining portions 33 in the left-right direction, and extend over substantially the entire length of the main body 2 in the longitudinal direction on both side portions of the main body 2.

The pair of side wall portions 34 are respectively overlapped on the joining portion 33 at both ends in the longitudinal direction, and fixed to the joining portion 33 by thermal welding, ultrasonic welding, or adhesion with a hot melt adhesive or the like. The side wall portion elastic member 35 is joined to the free end of the side wall portion 34, and the side wall portion elastic member 35 contracts to form gathers (ギャザー).

Fig. 5 is a partial cross-sectional view of the disposable diaper 1 cut at the position of V-V shown in fig. 3. The front side of the disposable diaper 1 is shown in fig. 5. The structure of the rear side of the disposable diaper 1 is the same as the structure of the front side shown in fig. 5. As shown in fig. 4 and 5, the exterior sheet body 40 of the exterior sheet 4 includes a 1 st exterior sheet 41 and a 2 nd exterior sheet 42 that is directly laminated on the inner surface (i.e., the wearer side) of the 1 st exterior sheet 41 and joined thereto with a hot melt adhesive or the like.

As shown in fig. 5, the exterior sheet body 40 further includes an end sheet 5 directly laminated on the inner surface of the 2 nd exterior sheet 42 and bonded thereto with a hot melt adhesive or the like. As shown in fig. 3, the end piece 5 is provided over substantially the entire width of the outer sheet 4 in the left-right direction (i.e., the lateral direction in fig. 3) of the disposable diaper 1, and as shown in fig. 5, the upper end portion of the absorbent body 20 is fixed by being sandwiched between the end piece 5 and the 2 nd outer sheet 42.

The upper end 421 of the 2 nd outer sheet 42 is substantially aligned with the upper end 51 of the end sheet 5 in the vertical direction and is spaced downward from the upper end of the 1 st outer sheet 41, i.e., the edge 111 of the waist opening 11. The upper end 421 of the 2 nd outer sheet 42 and the upper end 51 of the end sheet 5 are positioned above the upper end 25 of the absorbent body 20.

The top sheet 21 of the absorbent body 20 shown in fig. 4 is a liquid-permeable sheet material, and rapidly traps moisture from excrement of a wearer and moves the moisture to the absorbent core 22. As the top sheet 21, for example, a liquid permeable nonwoven fabric (a point-bond nonwoven fabric, a hot-air nonwoven fabric, a spunbond nonwoven fabric, or the like) formed of hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, or the like) whose surface has been hydrophilically treated with a surfactant is used. Further, as the top sheet 21, a nonwoven fabric (for example, a spun nonwoven fabric) made of hydrophilic fibers such as cellulose, rayon, and cotton can be used.

The Absorbent core 22 is formed by wrapping a mixture of crushed hydrophilic fibers such as pulp fibers and cellulose fibers with a particulate super Absorbent polymer (sap (super Absorbent polymer)) or a super Absorbent fiber, and the like, with tissue paper (ティッシュペーパー), liquid permeable nonwoven fabric, or the like, and the Absorbent core 22 absorbs and rapidly fixes the water having passed through the top sheet 21. The hydrophilic fibers are bonded to the hydrophilic fibers and the water-absorbent material with a hot-melt adhesive, such as tissue paper or liquid-permeable nonwoven fabric, which covers the hydrophilic fibers, thereby preventing the hydrophilic fibers from being deformed and the water-absorbent material from falling off (particularly, from falling off after absorbing water). In the present embodiment, the absorbent core 22 includes pulp fibers and SAP.

As the back sheet 23, a water repellent or liquid impermeable nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, an SMS (spunbond/meltblown/spunbond) nonwoven fabric) formed of hydrophobic fibers, or a water repellent or liquid impermeable plastic film is used to prevent moisture or the like of excrement that has reached the back sheet 23 from leaking to the outside of the main body portion 2. When a plastic film is used for the back sheet 23, it is preferable to use a plastic film having moisture permeability (air permeability) from the viewpoint of preventing stuffiness of the disposable diaper 1 and improving comfort of the wearer.

As the sheet main body of the side sheet 3, a hydrophobic or liquid impermeable nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, and an SMS nonwoven fabric) formed of hydrophobic fibers is used. As the side wall portion elastic member 35, for example, a polyurethane filament, a belt-like polyurethane film, a string-like or belt-like natural rubber, or the like is used, and in the present embodiment, a polyurethane filament is used as the side wall portion elastic member 35.

As the 1 st outer sheet 41, the 2 nd outer sheet 42 and the end sheet 5 of the outer sheet main body 40 shown in fig. 5, a hydrophobic or liquid impermeable nonwoven fabric or plastic film formed of hydrophobic fibers or a laminate sheet formed by laminating the nonwoven fabric and the plastic film is used in the same manner as the back sheet 23. As the plastic film, a plastic film having moisture permeability (air permeability) is preferably used. As the 1 st outer sheet 41, the 2 nd outer sheet 42, and the end sheet 5, a nonwoven fabric made of hydrophilic fibers or a liquid-permeable nonwoven fabric made of hydrophobic fibers after hydrophilic treatment can also be used as in the top sheet 21.

In the disposable diaper 1, a spun-bonded nonwoven fabric formed by melting a material containing a thermoplastic resin (for example, a polyolefin resin or a polyester resin) and a surfactant is preferably used as the 1 st outer sheet 41 and the 2 nd outer sheet 42. Here, the blending ratio of the surfactant in the material is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and further preferably 5.0% by mass or less, more preferably 3.5% by mass or less. The polyolefin resin is preferably polyethylene or polypropylene, and the polyester resin is preferably pet (polyethylene terephthalate), pbt (polybutylene terephthalate), or ptt (polytrimethylene terephthalate). The nonwoven fabric preferably has a fiber fineness of 1.0dtex or more, preferably less than 1.5 dtex. The basis weight of the nonwoven fabric is preferably 10g/m²Above, preferably 35g/m²The following. The basis weight of the nonwoven fabric is more preferably 15g/m from the viewpoints of air permeability and strength²Above, it is more preferably 25g/m2 or less.

The 1 st outer sheet 41 of the outer sheet 4 has a folded-back portion 46 folded back toward the wearer side at the edge 111 of the waist opening 11. The lower end 461 of the folded portion 46 is positioned below the upper end 421 of the 2 nd outer sheet 42 and the upper end 51 of the end sheet 5 and above the upper end 25 of the absorbent body 20. The upper end portion of the 2 nd outer sheet 42 and the upper end portion of the end sheet 5 are sandwiched between a facing portion 47 and a folded-back portion 46, the facing portion 47 being a portion of the 1 st outer sheet 41 facing the folded-back portion 46, and the folded-back portion 46 being joined to the facing portion 47 and the upper end portion of the end sheet 5.

A waist elastic member 44 is disposed along the edge 111 of the waist opening 11 between the folded-back portion 46 and the opposing portion 47, and as shown in fig. 3, the waist elastic member 44 extends in the left-right direction and is joined to the front portion 401 and the rear portion 403. In the disposable diaper 1, the outer covering sheet main body 40 contracts due to contraction of the waist elastic member 44, and a waist opening gather which comes into contact with the wearer is formed. In the present embodiment, the waist elastic member 44 has 6 elastic threads, as shown in fig. 5. In the following description, two elastic threads near the upper end of the folded part 46, that is, the edge 111 of the waist opening 11 are referred to as "1 st elastic thread 441", and 4 elastic threads located below the 1 st elastic thread 441 are referred to as "2 nd elastic thread 442". The two 1 st elastic threads 441 are collectively referred to as "1 st waist elastic member 443", and the 42 nd elastic threads 442 are collectively referred to as "2 nd waist elastic member 444". That is, the waist elastic member 44 has a 1 st waist elastic member 443 disposed substantially parallel to the edge 111 of the waist opening 11 and a 2 nd waist elastic member 444 disposed substantially parallel to the 1 st waist elastic member 443.

The two 1 st elastic threads 441 are aligned in the vertical direction and extend substantially parallel to the edge 111 of the waist opening 11. The 42 nd elastic threads 442 are arranged at substantially equal intervals in the vertical direction and extend substantially parallel to the 1 st elastic threads 441, respectively. The vertical distance between the 1 st elastic threads 441, that is, the vertical distance between two 1 st elastic threads 441 is greater than the vertical distance between the 2 nd elastic threads 442, that is, the vertical distance between two 2 nd elastic threads 442 adjacent to each other in the vertical direction. Thus, the pitch of the 1 st elastic thread 441 and the pitch of the 2 nd elastic thread 442 are different from each other. The pitch of the 1 st elastic thread 441 and the pitch of the 2 nd elastic thread 442 are, for example, 7mm and 3.5mm, respectively. The vertical distance between the lower 1 st elastic thread 441 and the uppermost 2 nd elastic thread 442 is substantially equal to the vertical distance between two 1 st elastic threads 441 (the pitch of the 1 st elastic threads 441).

The two 2 nd elastic threads 442 on the upper side of the two 1 st elastic threads 441 and the 42 nd elastic threads 442 are arranged between the folded portion 46 and the facing portion 47 of the 1 st exterior sheet 41 at positions above the upper end 421 of the 2 nd exterior sheet 42 and the upper end 51 of the end sheet 5, and are directly joined to the folded portion 46 and the facing portion 47. The lower two 2 nd elastic threads 442 of the 42 nd elastic threads 442 are disposed between the folded portion 46 and the end piece 5 at a position lower than the upper end 421 of the 2 nd exterior sheet 42 and the upper end 51 of the end piece 5, and are directly joined to the folded portion 46 and the end piece 5.

The region where the waist elastic members 44 are disposed in the outer sheet 4 is referred to as a "waist region 406", and when a band-shaped region along the edge 111 of the waist opening 11, that is, a region where the 1 st waist elastic member 443 and the 2 nd waist elastic member 444 are disposed in the waist region 406 is referred to as a "1 st waist region 407" and a "2 nd waist region 408", respectively, the 1 st waist region 407 is a band-shaped region above the waist region 406, and the 2 nd waist region 408 is a band-shaped region below the waist region 406, and is located below the 1 st waist region 407.

As described above, the waist region 406 is formed by laminating the folded back portion 46 and the facing portion 47 of the 1 st outer sheet 41, the 2 nd outer sheet 42, and the end sheet 5, that is, a plurality of sheet members. The 1 st waist region 407 and the 2 nd waist region 408 have upper portions formed by the folded back portion 46 and the opposing portion 47 of the 1 st outer sheet 41, and lower portions formed by the folded back portion 46, the opposing portion 47, the 2 nd outer sheet 42, and the end sheet 5 of the 2 nd waist region 408. That is, the number of layers of the sheet member in the 1 st waist region 407 is 2, which is smaller than 4, which is the number of layers of the sheet member in the lower portion of the 2 nd waist region 408.

Specifically, the 1 st waist region 407 is a region extending from the edge 111 of the waist opening 11 to the center in the vertical direction of the 1 st elastic thread 441 and the uppermost 2 nd elastic thread 442 on the lower side in the vertical direction. The 2 nd waist region 408 is a region from the center in the vertical direction of the lower 1 st elastic thread 441 and the uppermost 2 nd elastic thread 442 (i.e., the lower end of the 1 st waist region 407) to a position at a distance which is half the pitch of the lower 2 nd elastic thread 442 relative to the lowermost 2 nd elastic thread 442. The lower end of the 2 nd waist region 408 is positioned above the lower end 461 (see fig. 5) of the folded portion 46. The waistline region 406 is located above the upper end 25 of the absorbent body 20, and the width of the waistline region 406 in the vertical direction is preferably 50mm or less.

As shown in fig. 1 and 2, the leg elastic members 43 are disposed along the edges 121 of the pair of leg openings 12 and joined between the 1 st outer sheet 41 and the 2 nd outer sheet 42 (see fig. 4) of the outer sheet 4. The upper end portions of the leg elastic members 43 on both sides are joined to the front portion 401 and the rear portion 403, and the central portion between the upper end portions of the leg elastic members 43 is joined to the crotch portion 402 of the outer sheet main body 40. Each leg elastic member 43 has a plurality of leg elastic threads 431. In the disposable diaper 1, the outer cover sheet main body 40 contracts due to contraction of the leg elastic members 43, and leg gathers that come into contact with the leg circumferences of the wearer are formed.

The intermediate elastic member 45 is disposed between the waist elastic member 44 and the upper end portion of the leg elastic member 43 in the vertical direction, extends in the left-right direction, and is joined to the front portion 401 and the rear portion 403. As shown in fig. 5, the intermediate elastic member 45 is disposed between the 1 st exterior sheet 41 and the 2 nd exterior sheet 42. The intermediate elastic member 45 includes a plurality of (12 in the present embodiment) intermediate elastic threads 451a, 451b arranged in the vertical direction and extending substantially parallel to the 1 st elastic thread 441 and the 2 nd elastic thread 442 of the waist elastic member 44. In the following description, two intermediate elastic threads near the upper side of the 2 nd elastic thread 442 are referred to as "1 st intermediate elastic threads 451 a", and 10 intermediate elastic threads located below the 1 st intermediate elastic thread 451a are referred to as "2 nd intermediate elastic threads 451 b". The two 1 st intermediate elastic threads 451a are collectively referred to as "1 st intermediate elastic members 45 a", and the 10 2 nd intermediate elastic threads 451b are collectively referred to as "2 nd intermediate elastic members 45 b". That is, the intermediate elastic member 45 has a 1 st intermediate elastic member 45a disposed substantially parallel to the edge 111 of the waist opening 11 and a 2 nd intermediate elastic member 45b disposed substantially parallel to the 1 st intermediate elastic member 45 a.

In the present embodiment, the interval between the two 1 st intermediate elastic threads 451a is 3.5 mm. In addition, the interval of the 2 nd intermediate elastic threads 451b adjacent to each other is alternately changed to 7mm and 14mm in the up-down direction. In other words, two 2 nd intermediate elastic threads 451b arranged at an interval of 7mm are used as the 2 nd intermediate elastic thread pair, and the 2 nd intermediate elastic thread pairs are arranged at an interval of 14 mm. In this way, the regularity of the arrangement of the plurality of 1 st intermediate elastic threads 451a is different from the regularity of the arrangement of the plurality of 2 nd intermediate elastic threads 451b in the vertical direction. The 2 nd intermediate elastic threads 451b may be arranged at a predetermined pitch in the vertical direction.

In the disposable diaper 1, the outer covering sheet main body 40 contracts due to contraction of the intermediate elastic member 45, and an intermediate gather which contacts the lower abdomen and the hip of the wearer is formed. In the following description, the band-shaped region in which the intermediate elastic member 45 is disposed in the exterior sheet 4 is referred to as an "intermediate elastic region 409". Specifically, the intermediate elastic region 409 is defined as a region from the uppermost 1 st intermediate elastic thread 451a to the lowermost 2 nd intermediate elastic thread 451b in the vertical direction. The intermediate elastic region 409 is also located above the upper end 25 of the absorbent body 20, similarly to the waist region 406.

When regions in the belt-like intermediate elastic region 409 substantially parallel to the edge 111 of the waist opening 11 where the 1 st intermediate elastic member 45a and the 2 nd intermediate elastic member 45b are respectively disposed are referred to as a "1 st intermediate elastic region 409 a" and a "2 nd intermediate elastic region 409 b", the 1 st intermediate elastic region 409a is a belt-like region above the intermediate elastic region 409, and the 2 nd intermediate elastic region 409b is a belt-like region below the intermediate elastic region 409 and is located below the 1 st intermediate elastic region 409 a. Specifically, the 1 st intermediate elastic region 409a is a region from the uppermost 1 st intermediate elastic thread 451a to the center between the lower 1 st intermediate elastic thread 451a and the uppermost 2 nd intermediate elastic thread 451b in the up-down direction. The 2 nd intermediate elastic region 409b is a region from the center between the 1 st intermediate elastic thread 451a on the lower side and the 2 nd intermediate elastic thread 451b on the uppermost side (i.e., the lower end of the 1 st intermediate elastic region 409 a) to the 2 nd intermediate elastic thread 451b on the lowermost side in the up-down direction.

An auxiliary region 410 in which no elastic member is disposed is provided between the 2 nd waist region 408 and the intermediate elastic region 409 in (the outer sheet main body 40 of) the outer sheet 4. The upper end of the auxiliary region 410 contacts the lower end of the 2 nd waist region 408, and the lower end of the auxiliary region 410 contacts the upper end of the intermediate elastic region 409. The width of the auxiliary region 410 in the vertical direction is preferably 2 times or more the pitch of the 2 nd elastic threads 442, more preferably 3 times or more the pitch of the 2 nd elastic threads 442, and is equal to or less than the width of the waist region 406 in the vertical direction. In the present embodiment, the width of the auxiliary area 410 is 10 mm. In the disposable diaper 1, all the 1 st and 2 nd elastic threads 441, 442 of the waist elastic member 44 and all the 1 st intermediate elastic threads 451a of the 1 st intermediate elastic member 45a are colored in a color different from the color of the elastic threads in the other elastic members (i.e., the 2 nd intermediate elastic member 45b and the leg elastic members 43). Specifically, the elastic threads of the other elastic member have the same color (for example, white) as the exterior sheet body 40, and the 1 st and 2 nd elastic threads 441, 442 and the 1 st intermediate elastic thread 451a have a different color from the exterior sheet body 40. Therefore, the substantially upper end of the auxiliary region 410 can be visually recognized by the 2 nd elastic thread 442 near the lower end of the 2 nd waist region 408, and the lower end of the auxiliary region 410 can be visually recognized by the 1 st intermediate elastic thread 451a at the upper end of the intermediate elastic region 409. This allows the auxiliary area 410 to be visually confirmed substantially. Further, a stripe pattern or the like extending in the left-right direction may be printed on the auxiliary area 410 of the exterior sheet main body 40, so that the auxiliary area 410 can be visually confirmed.

In the present embodiment, all of the plurality of 1 st elastic threads 441 and the plurality of 2 nd elastic threads 442 of the waist elastic member 44, the plurality of leg elastic threads 431 of the leg elastic member 43 (see fig. 1 and 2), and the plurality of intermediate elastic threads 451a and 451b of the intermediate elastic member 45 are polyurethane threads having the same elastic modulus and fiber fineness. The polyurethane filament has a fiber fineness of, for example, 100 to 2500 dtex. Of course, the fiber fineness of the elastic threads may be different from each other, and it is preferable that the disposable diaper 1 use the 1 st and 2 nd elastic threads 441, 442 of 940dtex, and the intermediate elastic threads 451a, 451b of 640 dtex.

The elastic thread is fixed to the outer sheet body 40 by thermal fusion bonding or by adhesion with an adhesive. The 1 st elastic thread 441 is preferably fixed to the exterior sheet main body 40 with an adhesive applied to the 1 st elastic thread 44. From the viewpoint of making the edge of the waist opening 11 in good contact with the skin, it is more preferable that the 1 st waist region 407 of the outer sheet main body 40 (the 1 st outer sheet 41 and the folded back portion 46) is not coated with the adhesive itself. On the other hand, in the 2 nd waist region 408, an adhesive may be applied to both or one of the 2 nd elastic threads 442 and the 2 nd waist region 408 of the outer-covering sheet body 40. In the present embodiment, the adhesive is applied to the 2 nd waist region 408 of the folded-back portion 46, the folded-back portion 46 is fixed to the facing portion 47 and the upper end portion of the end sheet 5, and the adhesive is not applied to the 1 st waist region 407 and the auxiliary region 410 themselves. From the viewpoint of improving the air permeability in the intermediate elastic region 409, it is preferable that the intermediate elastic threads 451a, 451b are fixed to the outer sheet main body 40 by applying an adhesive to the intermediate elastic threads 451a, 451b of the intermediate elastic member 45 and not applying an adhesive to the intermediate elastic region 409 itself of the outer sheet main body 40. In this case, the adhesive is applied only to the portions of the intermediate elastic threads 451a, 451b near the pair of belt-like protrusions 13, that is, to both end portions, thereby further improving air permeability.

The stretch ratio of the 1 st elastic thread 441 bonded to the 1 st waist region 407 is equal to the stretch ratio of the 2 nd elastic thread 442 bonded to the 2 nd waist region 408. In addition, the number of the 1 st elastic threads 441 per unit width in the up-down direction in the 1 st waist region 407, that is, the total number of the 1 st elastic threads 441 divided by the width in the up-down direction of the 1 st waist region 407 is smaller than the number of the 2 nd elastic threads 442 per unit width in the up-down direction in the 2 nd waist region 408. Therefore, in a state where the outer sheet 4 is stretched in the left-right direction (for example, a state where the disposable diaper 1 is worn), the 1 st unit contraction force, which is the contraction force in the left-right direction per unit width in the up-down direction in the 1 st waist region 407, is smaller than the 2 nd unit contraction force, which is the contraction force in the left-right direction per unit width in the up-down direction in the 2 nd waist region 408.

Thereby, the 2 nd waist region 408 of the waist region 406 is in close contact with the waist of the wearer, and the 1 st waist region 407 is in relatively soft contact with the waist of the wearer. As a result, the upper end portions of the pair of band-shaped protrusions 13 can be prevented from biting into the skin of the wearer. Further, by maintaining the contraction force of the entire waist region 406 instead of the setting in which the 1 st unit contraction force is relatively small, the 1 st waist region 407 and the 2 nd waist region 408 are brought into close contact with the wearer, and thereby the disposable diaper 1 can be prevented from shifting in the vertical direction when worn. The 1 st unit contraction force is preferably 70% or less of the 2 nd unit contraction force, but in the present embodiment, is about 50% of the 2 nd unit contraction force.

In putting on and taking off a pants-type disposable diaper, after both legs of a wearer are inserted into a pair of leg openings of the disposable diaper, the disposable diaper is pulled up along the body of the wearer, or the disposable diaper in a worn state is pulled down along the body of the wearer. In this case, the waist opening is opened wide in order to avoid the edge of the waist opening from hooking on a part of the wearer's body. In this case, in the disposable diaper 1 in which the 1 st contraction force is smaller than the 2 nd contraction force, the edge of the waist opening 11 can be widely opened with a small force, and the disposable diaper 1 can be easily moved along the body of the wearer.

From the viewpoint of preventing the disposable diaper 1 from shifting in the vertical direction when worn, the contractive force per unit width of the entire waist region 406 is preferably 1cN/mm or more (more preferably 2cN/mm or more). The measurement of the contractive force per unit width of the entire waist region 406 was carried out as follows using "Tencillon" (model: RTG-1210) from Ainshi corporation (エ - & アンド & ディ) as a measuring device. The measurement of the 1 st unit contraction force, the 2 nd unit contraction force, and the intermediate unit contraction force described later is also performed in the same manner.

First, the waist region 406 of the disposable diaper 1 is cut across the entire width in the vertical direction to obtain a test piece. Next, both ends of the test piece in the left-right direction (i.e., the direction in which the 1 st elastic thread 441 and the 2 nd elastic thread 442 extend) are gripped by a grip portion of the measuring device, the test piece is stretched in the left-right direction, and the load until recovery is further measured. At this time, the test piece is stretched to 90% of the length of the test piece in the left-right direction (i.e., the length in an uncontracted state) when the 1 st elastic thread 441 and the 2 nd elastic thread 442 are not provided. The test piece was repeatedly stretched and the load was measured several times. Next, the length of the test piece was determined from the measurement results as the load at the time when the length of the test piece before stretching (i.e., the length of the test piece in which the 1 st elastic thread 441 and the 2 nd elastic thread 442 had contracted) was 180%, and the average load was determined as the average of the multiple measurements of the load. Then, the average load was divided by the vertical width of the test piece to determine the contraction force per unit width of the test piece.

As described above, in the exterior sheet 4, the number of layers of the sheet member in the 1 st waist region 407 is smaller than the number of layers of the sheet member in the 2 nd waist region 408, so that the number of layers of the sheet member constituting the upper end portions of the pair of belt-like protrusions 13 can be reduced to reduce the rigidity. As a result, the upper end portions of the pair of band-shaped protrusions 13 can be further prevented from biting into the skin of the wearer. In addition, the edges of the waist opening 11 can be opened widely with a small force.

The 1 st outer sheet 41 of the outer sheet 4 is folded back at the edge 111 of the waist opening 11 to form a folded-back portion 46, and the waist elastic member 44 is disposed between the folded-back portion 46 and the opposing portion 47. In this way, by forming the edge 111 of the waist opening 11 and the upper ends of the pair of belt-like protrusions 13 as continuous folds of the sheet member, it is possible to further suppress the edge 111 of the waist opening 11 and the upper ends of the pair of belt-like protrusions 13 from biting into the skin of the wearer, as compared with the case where the edge 111 of the waist opening 11 and the upper ends of the pair of belt-like protrusions 13 are cut edges of the sheet member. Also in the waist region 406, by making the pitch in the up-down direction of the plurality of 1 st elastic threads 441 larger than the pitch in the up-down direction of the plurality of 2 nd elastic threads 442, the 1 st unit contractive force in the 1 st waist region 407 can be made smaller than the 2 nd unit contractive force in the 2 nd waist region 408 more easily.

In the disposable diaper 1, the stretch ratio of the intermediate elastic threads 451a, 451b when joined to the intermediate elastic region 409 is equal to the stretch ratio of the 1 st elastic thread 441 when joined to the 1 st waist region 407, or is smaller than the stretch ratio of the 1 st elastic thread 441 when joined to the 1 st waist region 407. The number of the intermediate elastic threads 451a, 451b per unit width in the up-down direction in the intermediate elastic region 409 (the average number) is smaller than the number of the 1 st elastic threads 441 per unit width in the up-down direction in the 1 st waist region 407. Therefore, in a state where the exterior sheet 4 is stretched in the left-right direction, the intermediate unit contractive force, which is the average contractive force in the left-right direction per unit width in the up-down direction in the intermediate elastic region 409, is smaller than the 1 st unit contractive force and the 2 nd unit contractive force described above. Therefore, in the intermediate elastic region 409, the disposable diaper 1 is prevented from being pressed excessively against the wearer and is brought into close contact with the wearer.

As described above, in the exterior sheet 4, any elastic member is not disposed in the auxiliary region 410 between the 2 nd waist region 408 and the intermediate elastic region 409. Therefore, in a state where the exterior sheet 4 is stretched in the left-right direction, the contraction force in the left-right direction per unit width in the vertical direction in the auxiliary region 410 is smaller than any of the intermediate unit contraction force, the 1 st unit contraction force, and the 2 nd unit contraction force. Thus, when the disposable diaper 1 is put on or taken off, the fingertips can be deeply hooked on the auxiliary region 410 to easily and firmly grip the disposable diaper 1, and the disposable diaper 1 can be easily moved along the body of the wearer. Further, since the auxiliary area 410 can be visually confirmed, the auxiliary area 410 can be easily recognized and used. In this way, from the viewpoint of hooking a fingertip to the auxiliary region 410, the width of the auxiliary region 410 in the vertical direction is preferably 7mm or more.

When the intermediate elastic region 409 is subdivided into the 1 st intermediate elastic region 409a and the 2 nd intermediate elastic region 409b, the stretch ratio of the 1 st intermediate elastic thread 451a when joined to the 1 st intermediate elastic region 409a is equal to the stretch ratio of the 2 nd intermediate elastic thread 451b when joined to the 2 nd intermediate elastic region 409 b. In addition, the number of the 1 st intermediate elastic threads 451a per unit width in the up-down direction in the 1 st intermediate elastic region 409a is greater than the number of the 2 nd intermediate elastic threads 451b per unit width in the up-down direction in the 2 nd intermediate elastic region 409 b. Therefore, in a state where the exterior sheet 4 is stretched in the left-right direction, the contraction force per unit width in the up-down direction in the 1 st intermediate elastic region 409a is larger than the contraction force per unit width in the up-down direction in the 2 nd intermediate elastic region 409b in the left-right direction.

When the disposable diaper 1 having a large force locally applied to the auxiliary region 410 is put on and taken off, the contraction force in the 1 st intermediate elastic region 409a adjacent to the auxiliary region 410 is made larger than the contraction force in the 2 nd intermediate elastic region 409b below the 1 st intermediate elastic region 409a, so that when the auxiliary region 410 is locally pulled up, the entire circumference of the 1 st intermediate elastic region 409a follows and is easily pulled up, and the disposable diaper 1 can be smoothly pulled up. In addition, in the disposable diaper 1, by equalizing the stretch ratios at the time of joining the 1 st intermediate elastic thread 451a and the 2 nd intermediate elastic thread 451b and making the pitch of the 1 st intermediate elastic thread 451a smaller than the pitch (average pitch) of the 2 nd intermediate elastic thread 451b in the vertical direction, it is easily achieved that the contraction force in the 1 st intermediate elastic region 409a is larger than the contraction force in the 2 nd intermediate elastic region 409 b.

Preferably, the stretch ratio of the 1 st intermediate elastic thread 451a when bonded to the 1 st intermediate elastic region 409a is equal to the stretch ratio of the 2 nd elastic thread 442 when bonded to the 2 nd waist region 408, and the number of the 1 st intermediate elastic threads 451a per unit width in the up-down direction in the 1 st intermediate elastic region 409a is substantially equal to the number of the 2 nd elastic threads 442 per unit width in the up-down direction in the 2 nd waist region 408. Therefore, in a state where the exterior sheet 4 is stretched in the left-right direction, the contraction force in the left-right direction per unit width in the up-down direction in the 1 st intermediate elastic region 409a is substantially equal to the 2 nd unit contraction force in the 2 nd waist region 408 (for example, the difference between the two is 10% or less of one contraction force). Thus, the 2 nd waist region 408 and the 1 st intermediate elastic region 409a on both sides of the vertically auxiliary region 410 are brought into close contact with the skin of the wearer under substantially the same pressure, and the skin of the wearer can be prevented from being locally compressed. In the disposable diaper 1, by equalizing the stretch ratios at the time of joining the 1 st intermediate elastic thread 451a and the 2 nd elastic thread 442 and equalizing the pitch of the 1 st intermediate elastic thread 451a and the pitch of the 2 nd elastic thread 442 in the vertical direction, it is easy to achieve equalization of the contraction force in the 1 st intermediate elastic region 409a and the 2 nd unit contraction force in the 2 nd waist region 408.

In the disposable diaper 1, the number of the 1 st elastic threads 441 and the 2 nd elastic threads 442 may be appropriately changed so long as the 1 st contraction force is smaller than the 2 nd contraction force. For example, in the case where the 1 st waist elastic member 443 has only 1 st elastic thread 441, the upper end of the 1 st waist region 407 is the edge 111 of the waist opening 11, and the lower end of the 1 st waist region 407 is the position at the center in the vertical direction between the 1 st elastic thread 441 and the uppermost 2 nd elastic thread 442. In the case where the 2 nd waist elastic member 444 has only 12 nd elastic thread 442, the upper end of the 2 nd waist region 408 is located at the center in the vertical direction between the 2 nd elastic thread 442 and the lowermost 1 st elastic thread 441, and the lower end of the 2 nd waist region 408 is located below the 2 nd elastic thread 442 and is offset by the vertical distance between the upper end and the 2 nd elastic thread 442. Similarly, the number of the 1 st intermediate elastic threads 451a and the 2 nd intermediate elastic threads 451b may be changed.

As described above, in the disposable diaper 1, the 1 st contraction force in the 1 st waist region 407 is made smaller than the 2 nd contraction force in the 2 nd waist region 408 by making the pitch in the vertical direction of the plurality of 1 st elastic threads 441 larger than the pitch in the vertical direction of the plurality of 2 nd elastic threads 442, but in the case where the 1 st contraction force is made smaller than the 2 nd contraction force by another method, the pitch of the 1 st elastic threads 441 can be made equal to or smaller than the pitch of the 2 nd elastic threads 442 (the pitch of the 1 st intermediate elastic threads 451a and the pitch of the 2 nd intermediate elastic threads 451b are the same).

For example, in the disposable diaper 1, the elongation of each 1 st elastic thread 441 when the 1 st elastic threads 441 of the 1 st waist elastic member 443 are joined to the 1 st waist region 407 may be made smaller than the elongation of each 2 nd elastic thread 442 when the 2 nd elastic threads 442 of the 2 nd waist elastic member 444 are joined to the 2 nd waist region 408, and the 1 st contraction force may be made smaller than the 2 nd contraction force. In this case, too, the 1 st unit contraction force can be easily made smaller than the 2 nd unit contraction force. Similarly, the contraction force in the 1 st intermediate elastic region 409a can be made larger than the contraction force in the 2 nd intermediate elastic region 409b by making the stretch ratio of each 1 st intermediate elastic thread 451a when the plurality of 1 st intermediate elastic threads 451a of the 1 st intermediate elastic member 45a are joined to the 1 st intermediate elastic region 409a larger than the stretch ratio of each 2 nd intermediate elastic thread 451b when the plurality of 2 nd intermediate elastic threads 451b of the 2 nd intermediate elastic member 45b are joined to the 2 nd intermediate elastic region 409 b. The stretch ratio of the elastic thread is preferably in a range of, for example, 1.1 to 5.0 times.

In addition, as the 1 st waist elastic member 443, the 1 st contraction force may be made smaller than the 2 nd contraction force by using the 1 st elastic thread 441 having an elastic modulus smaller than the elastic modulus of each 2 nd elastic thread 442 of the 2 nd waist elastic member 444, or using the 1 st elastic thread 441 having a fiber fineness smaller than the fiber fineness of each 2 nd elastic thread 442. In either case, the 1 st unit contraction force can be easily made smaller than the 2 nd unit contraction force. Similarly, as the 1 st intermediate elastic member 45a, the 1 st intermediate elastic thread 451a having a larger elastic modulus than the 2 nd intermediate elastic threads 451b of the 2 nd intermediate elastic member 45b or the 1 st intermediate elastic thread 451a having a larger fiber fineness than the 2 nd intermediate elastic threads 451b can be used, so that the contraction force in the 1 st intermediate elastic region 409a can be easily made larger than the contraction force in the 2 nd intermediate elastic region 409 b.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various changes can be made.

In a state where the exterior sheet 4 is stretched in the left-right direction, the auxiliary region 410 can be provided with an elastic member as long as the contraction force in the auxiliary region 410 is smaller than any one of the intermediate unit contraction force, the 1 st unit contraction force, and the 2 nd unit contraction force.

As the leg elastic members 43, the waist elastic member 44, and the intermediate elastic member 45, for example, a belt-like urethane film, a string-like or belt-like natural rubber, or the like can be used as in the side wall elastic member 35 of the side sheet 3. From the viewpoint of making the disposable diaper 1 in good contact with the skin, it is preferable to use a polyurethane yarn covered with fibers.

Although the intermediate unit contractive force is smaller than the 1 st and 2 nd unit contractive forces in the above embodiment, the intermediate unit contractive force may be equal to or greater than the 1 st unit contractive force as long as the contractive force per unit width of the entire waist region 406 is set to an appropriate magnitude to prevent vertical displacement of the disposable diaper 1 when worn.

The structure of the disposable diaper 1 described above can also be used for pants-type absorbent articles other than disposable diapers.

The configurations in the above-described embodiment and the modifications can be appropriately combined as long as they are not contradictory to each other.

The present invention has been described in detail, but the description is illustrative and not restrictive. Thus, many modifications and variations are possible without departing from the scope of the invention.

Description of the reference numerals

Disposable diaper 1

4 outer sheet

5 end piece

11 waist opening

12 leg opening

13 strip-shaped projection

20 absorbent body

25 upper end

43 leg elastic member

44 waist elastic member

45 middle elastic part

45a 1 st intermediate elastic member

45b 2 nd intermediate elastic member

46 folded back part

47 opposite part

111. 121 edge

400 connecting wire

401 front part

402 crotch part

403 rear part

404. 405 part

406 waist region

407 the 1 st waist region

408 the 2 nd waist region

409 middle elastic region

409a intermediate elastic region 1

409b intermediate 2 elastic region

410 auxiliary area

441 st elastic thread

442 nd 2 elastic thread

443 st 1 waist elastic member

444 nd 2 waist elastic member

Claims (15)

1. An absorbent article which is a pants-type absorbent article, wherein,

the absorbent article has:

an outer sheet having a waist opening at an upper end and a pair of leg openings at a lower portion;

an absorbent body attached to the wearer side of the exterior sheet for absorbing excrement from the wearer,

the exterior sheet has:

a front portion located on a ventral side of the wearer;

a rear portion located on a back side of the wearer, both side ends of the rear portion being connected to both side ends of the front portion;

a crotch portion continuous with the front portion and the rear portion;

a pair of belt-shaped protruding portions formed by joining an inner surface of a portion laterally continuous from both side ends of the front portion and an inner surface of a portion laterally continuous from both side ends of the rear portion, the pair of belt-shaped protruding portions being belt-shaped extending in an up-down direction and protruding laterally from a connecting line between the front portion and the rear portion;

a waist elastic member joined to the front portion and the rear portion in a waist region along an edge of the waist opening, and configured to contract to form a waist opening gather;

a leg elastic member joined to the crotch portion along edges of the pair of leg openings and contracted by the leg elastic member to form a pair of leg opening gathers;

an intermediate elastic member that is joined to the front portion and the rear portion between the waist elastic member and the leg elastic member in the vertical direction and that is contracted to form an intermediate gather,

the waist elastic member has:

a 1 st waist elastic member disposed in a 1 st waist region which is an upper portion of the waist region so as to be substantially parallel to the edge of the waist opening;

a 2 nd waist elastic member disposed in a 2 nd waist region which is a region of the waist region located below the 1 st waist region and is substantially parallel to the 1 st waist elastic member,

in a state where the outer covering sheet is stretched in a left-right direction perpendicular to the up-down direction, the left-right direction contractive force per unit width in the up-down direction in the 1 st waist region is a 1 st unit contractive force, the left-right direction contractive force per unit width in the up-down direction in the 2 nd waist region is a 2 nd unit contractive force, and the 1 st unit contractive force is smaller than the 2 nd unit contractive force.

2. The absorbent article of claim 1,

the waist region is located at a position closer to an upper side than an upper end of the absorber.

3. The absorbent article of claim 1,

the width of the waist region in the up-down direction is 50mm or less.

4. The absorbent article of claim 1,

the outer cover has a folded-back portion that is folded back toward the wearer side at the edge of the waist opening,

the waist elastic member is disposed between a portion of the outer sheet facing the folded portion and the folded portion.

5. The absorbent article of claim 1,

the waist region is formed by laminating a plurality of sheet members,

the number of layers of the sheet member in the 1 st waist region is smaller than the number of layers of the sheet member in the 2 nd waist region.

6. The absorbent article of claim 1,

the 1 st unit contraction force is 70% or less of the 2 nd unit contraction force.

7. The absorbent article of claim 1,

the 1 st waist elastic member has a plurality of 1 st elastic threads arranged in the up-down direction and extending substantially parallel to the edges of the waist opening,

the 2 nd waist elastic member has a plurality of 2 nd elastic threads aligned in the up-down direction and extending substantially parallel to the plurality of 1 st elastic threads,

the pitch in the up-down direction of the plurality of 1 st elastic threads is greater than the pitch in the up-down direction of the plurality of 2 nd elastic threads.

8. The absorbent article of claim 1,

a stretch ratio of the 1 st waist elastic joined to the 1 st waist region is smaller than a stretch ratio of the 2 nd waist elastic joined to the 2 nd waist region.

9. The absorbent article of claim 1,

the 1 st waist elastic member has a lower modulus of elasticity than the 2 nd waist elastic member.

10. The absorbent article of claim 1,

the fiber fineness of the 1 st waist elastic member is smaller than the fiber fineness of the 2 nd waist elastic member.

11. The absorbent article according to any one of claims 1 to 10, wherein,

in the exterior sheet, an auxiliary region is provided between the 2 nd waist region and the intermediate elastic region in which the intermediate elastic member is disposed,

in a state where the exterior sheet is stretched in the left-right direction, the left-right direction contractive force per unit width in the up-down direction in the auxiliary region is smaller than the left-right direction contractive force per unit width in the up-down direction in the intermediate elastic region and any one of the 1 st unit contractive force and the 2 nd unit contractive force.

12. The absorbent article of claim 11,

no elastic member is arranged in the auxiliary area.

13. The absorbent article of claim 11,

the auxiliary area can be visually confirmed.

14. The absorbent article of claim 11,

the intermediate elastic member has:

a 1 st intermediate elastic member disposed in a 1 st intermediate elastic region that is an upper portion of the intermediate elastic region so as to be substantially parallel to the edge of the waist opening;

a 2 nd intermediate elastic member disposed in a 2 nd intermediate elastic region that is a region below the 1 st intermediate elastic region in the intermediate elastic region so as to be substantially parallel to the 1 st intermediate elastic member,

in a state where the exterior sheet is stretched in the left-right direction, the left-right direction contraction force per unit width in the up-down direction in the 1 st intermediate elastic region is larger than the left-right direction contraction force per unit width in the up-down direction in the 2 nd intermediate elastic region.

15. The absorbent article of claim 14,

in a state where the exterior sheet is stretched in the left-right direction, the contraction force in the left-right direction per unit width in the up-down direction in the 1 st intermediate elastic region is substantially equal to the 2 nd unit contraction force.