JP2020025787A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of exhibiting actual absorption performance in an absorbent article which is folded from a crease extending in the width direction in an inseam area. SOLUTION: In a disposable diaper 10, the inseam area has a first region and a second region divided by a crease FL extending in the width direction W in the front-rear direction L as a boundary, and the disposable diaper has a fold as a base point in the inseam area. It is folded so that the skin sides face each other. The disposable diaper includes a pair of inseam elastic portions 41 that expand and contract in the anteroposterior direction in a region overlapping the absorption core in the inseam region, and the inseam elastic portions are formed by one end edge 41F in the anteroposterior direction and the other end edge. It has a trailing edge 41R. The front edge and the trailing edge are arranged in the first region without straddling the crease, and the front edge is located closer to the crease than the trailing edge. In the folded state of the disposable diaper, the front edge is arranged at the leg opening 25 between the inseam-side edge 25c closest to the crease and the crease in the anteroposterior direction. [Selection diagram] Fig. 6

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  2. Description of the Related Art Conventionally, an absorbent article that is folded such that skin sides of the absorbent article face each other starting from a crease extending in a width direction in a crotch region is widely known (for example, see Patent Literature 1). The absorbent article configured as described above can be accommodated in a state in which the length in the front-rear direction is shortened (about half), and the size of the package can be reduced.

JP 2014-158959 A

  When the wearer deploys the absorbent article starting from the fold in the crotch region, the region near the fold may not be fully developed because of the fold. When worn on the wearer in such a state that it is not sufficiently deployed, the area near the fold becomes far from the wearer's skin and separates from the wearer's outlet. Further, in the region near the fold, the skin surfaces that can come into contact with the wearer's skin may face each other, and the skin surface near the fold may be hidden. In such a state, it is difficult for the body fluid of the wearer to reach the skin surface near the fold, and it is difficult for the body fluid to be absorbed from the skin surface near the fold. As a result, the absorbent article may not be able to exhibit the actual absorption performance.

  Therefore, there is a demand for an absorbent article which can be folded at a crease extending in the width direction in a crotch region and which can exhibit actual absorption performance.

  The absorbent article according to one aspect is a front and rear direction and a width direction orthogonal to each other, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region, and at least the An absorbent core disposed in the crotch region, and a leg opening portion disposed around the leg of the wearer when the absorbent article is worn. The crotch region has a first region and a second region separated by a fold extending in the width direction in the front-rear direction. In the crotch region, the absorbent article is folded such that skin sides of the absorbent article face each other with the fold as a base point. The absorbent article includes a pair of crotch elastic portions that extend and contract in the front-rear direction in a region of the crotch region overlapping the absorbent core. The crotch elastic portion has a first edge that is one edge in the front-rear direction and a second edge that is the other edge in the front-rear direction.

It is the top view seen from the skin side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core concerning an embodiment. It is a schematic cross section along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross section along the BB cross section of the disposable diaper shown in FIG. It is the figure which showed typically the relationship of the front-back direction L of the crotch expansion-contraction part and the center high rigidity part in the extended state of a disposable diaper. It is sectional drawing which showed typically the state which the disposable diaper folded into two was folded. It is the figure which showed typically the mounting state in the AA cross section of a disposable diaper. It is the figure which showed typically the mounting state of the disposable diaper which concerns on embodiment.

(1) Outline of Embodiment At least the following matters will be apparent from the description of the present specification and the accompanying drawings.

  The absorbent article according to one aspect is a front and rear direction and a width direction orthogonal to each other, a front waist region, a rear waist region, and a crotch region disposed between the front waist region and the rear waist region, and at least the An absorbent core disposed in the crotch region, and a leg opening portion disposed around the leg of the wearer when the absorbent article is worn. The crotch region has a first region and a second region separated by a fold extending in the width direction in the front-rear direction. In the crotch region, the absorbent article is folded such that skin sides of the absorbent article face each other with the fold as a base point. The absorbent article includes a pair of crotch elastic portions that extend and contract in the front-rear direction in a region of the crotch region overlapping the absorbent core. The crotch elastic portion has a first edge that is one edge in the front-rear direction and a second edge that is the other edge in the front-rear direction. The first edge and the second edge are arranged in the first region without straddling the fold. The second edge is located closer to the fold than the first edge. In a state where the absorbent article is folded, the second edge is disposed between the edge closest to the fold and the fold in the leg opening at the front-rear direction.

  According to this aspect, in the front-rear direction, since the second edge is disposed closer to the fold than the edge of the leg opening, the second edge is in a state in which the skin sides face each other. It is located in the area near the easy fold. Here, when the crotch elastic portion is arranged across the fold, the second edge contracts in the direction of the fold due to the contraction force of the crotch elastic portion. For this reason, the area near the fold where the second edge is arranged is pulled down to the fold side and cannot be brought close to the wearer's outlet. On the other hand, when the inseam extension / contraction portion is arranged not to straddle the fold, the second edge is directed to the waist region side (the front waist region side or the rear waist region region side) opposite to the fold. Since it contracts, the region near the fold where the second edge is disposed is pulled up toward the waistline by the contraction force of the crotch elastic portion. By raising the region near the fold to the waistline region side, one skin surface is easily exposed from a state where the skin surface sides face each other. In addition, in the worn state, the area near the fold can be brought closer to the wearer's outlet by raising the area near the fold. As described above, since the skin surface near the fold is exposed and approaches the outlet of the wearer, the body fluid can be easily absorbed from the skin surface near the fold. As a result, even if the absorbent article is folded at the crease extending in the width direction in the crotch region, the actual absorbent performance can be exhibited.

  According to a preferred aspect, in the extended state of the absorbent article, a length from the second edge to the fold in the front-rear direction is shorter than a length of the crotch elastic portion. Since the length from the second edge to the fold is shorter than the length of the crotch elastic portion, the second edge is arranged closer to the fold. Since the skin surface is more difficult to be exposed in the region closer to the fold, the region near the fold where the skin surface is more difficult to expose can be pulled up to the waistline side by contracting the second edge from closer to the fold. Therefore, the skin surface near the fold can be more exposed, and the body fluid can be easily absorbed from the skin surface near the fold.

  According to a preferred aspect, the absorbent core in the crotch region is provided with a high-rigidity portion having higher rigidity than the surrounding region. The high rigidity portion has a first rigid edge that is one edge in the front-rear direction and a second rigid edge that is the other edge in the front-rear direction. The first rigid edge is located in the first region. The second rigid edge is disposed in the second area or an area of the first area closer to the fold than the second edge in the front-rear direction. The second rigid edge is arranged in the second area or an area of the first area closer to the fold than the second edge. Thus, in the front-rear direction, (at least a part of) the high-rigidity portion is disposed between the crotch elastic portion and the fold. Since the high-rigidity portion has higher rigidity than the region where the high-rigidity portion is not formed, when the high-rigidity portion is pulled up toward the waist region by contraction of the crotch elastic portion, the crotch elastic portion along with the high-rigidity portion. The area between the fold and the fold can be raised. Therefore, since the region near the fold in a wide range can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold.

  According to a preferred aspect, in the front-rear direction, the second edge is arranged closer to the fold than the first rigid edge. Since there is a region where the crotch elastic portion and the high-rigidity portion overlap in the width direction, the high-rigidity portion is more easily pulled up to the waistline side by contraction of the crotch elasticity portion. The region between the crotch elastic portion and the fold can be more reliably pulled up together with the high rigidity portion. Therefore, since the region near the fold in a wide range can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold.

  According to a preferred aspect, in the extended state of the absorbent article, the length from the first edge to the one rigid edge in the front-rear direction is from the one rigid edge to the second edge. Longer than the length. The length from the first edge to the first rigid edge corresponds to a non-overlapping region of the crotch elastic portion where the crotch elastic portion and the high rigidity portion do not overlap in the width direction. The length from the first rigid edge to the second edge corresponds to an overlapping area where the crotch elastic portion and the high rigid portion overlap in the width direction. Since the high-rigidity portion has higher rigidity than the region where the high-rigidity portion is not provided, in the overlapping region, the contraction force by the crotch elastic portion is likely to decrease. On the other hand, in a non-overlapping region of the crotch elastic portion where the crotch elastic portion does not overlap with the high rigidity portion, the contraction force by the crotch elastic portion is not easily reduced. By making the non-overlapping region of the crotch elastic portion larger than the overlapping region where the contraction force is apt to decrease, the reduction of the contraction force can be suppressed, and the region near the fold in a wide range can be more reliably pulled up.

  According to a preferred aspect, in the extended state of the absorbent article, the length from the first rigid edge to the second edge in the front-rear direction is from the second edge to the second rigid edge. It is shorter than the length to the edge.

  According to a preferred aspect, the length from the first rigid edge to the second edge corresponds to an overlap region where the crotch elastic portion and the high rigid portion overlap in the width direction. The length from the second edge to the second rigid edge corresponds to a non-overlapping region of the high rigid portion where the crotch elastic portion and the high rigid portion do not overlap in the width direction. Therefore, in the front-back direction, the length of the overlapping region is shorter than the length of the non-overlapping region. Since the high-rigidity portion has higher rigidity than the region where the high-rigidity portion is not provided, the region from the second edge to the second rigid edge is pulled up together with the high-rigidity portion. Since the area to be raised (that is, the non-overlapping area) is larger than the area where the contraction force is reduced (that is, the overlapping area), the area in the vicinity of a wide range of folds can be raised more reliably. For example, the second rigid edge is disposed in the second region. Since the second rigid edge is disposed in the second region, the high rigid portion is disposed across the fold. Thereby, not only the first area side but also the skin surface near the fold on the second area side can be pulled up to the waist area side. Therefore, since the region near the fold in a wide range can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold.

  According to a preferred aspect, in the extended state of the absorbent article, a length from the fold to the second rigid edge in the front-rear direction is longer than a length from the second edge to the fold. . The length from the fold to the second rigid edge corresponds to the high rigid portion in the second region. The length from the second edge to the fold corresponds to the high-rigidity part of the high-rigidity part in the first region that does not overlap the crotch elastic part in the width direction. By increasing the size of the high-rigidity portion in the second region, it is possible to raise the skin surface near the fold on the second region side in a wider range toward the waistline region.

  According to a preferred aspect, in a state where the absorbent article is folded, in the front-rear direction, the second rigid edge is located between the edge closest to the fold and the fold at the leg opening. Are located in By arranging the second rigid edge between the edge of the leg opening and the fold, which are likely to face each other on the skin side, the area where the skin sides face each other is efficiently moved to the waistline side. Can be raised.

  According to a preferred aspect, in a state in which the absorbent article is folded, a length from the fold to the second rigid edge in the front-rear direction is from the second rigid edge to the leg opening. Is shorter than the length to the edge closest to the fold. Since the high-rigidity portion has high rigidity, the area where the high-rigidity portion is not formed is more comfortable for the wearer. By making the length from the fold to the second rigid edge shorter than the length from the second rigid edge to the edge of the leg opening, the wearer can maintain the feel of the wearer while maintaining a wider second area. The skin surface near the fold on the region side can be pulled up to the waistline region side.

  According to a preferred aspect, in a state where the absorbent article is folded, in the front-rear direction, the second edge is located between a base point portion of the leak-proof gather that stands on the skin surface side when worn and the fold. Are located in Since the contraction force of the leak-proof gather does not act between the base point of the leak-proof gather and the fold, when the absorbent article is deployed, the skin surfaces tend to face each other. By arranging the second edge between the base point of the leakage-preventing gather and the fold, a region near the fold where the skin surface sides tend to face each other can be pulled up to the waistline region side.

(2) Overall Schematic Configuration of Disposable Diaper Hereinafter, a disposable diaper according to an embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, parts having different dimensional relationships and ratios between drawings may be included.

  The disposable diaper may be a tape-type disposable diaper or a pants-type disposable diaper. You. FIG. 1 is a plan view of the disposable diaper 10 according to the present embodiment as viewed from the skin side, and FIG. 2 is a plan view of the absorbent core according to the embodiment as viewed from the skin side. The plan views shown in FIGS. 1 and 2 show the disposable diaper in an extended state. FIG. 3 is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. FIG. 4 is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. In addition, the extended state in this invention is the state which extended the disposable diaper 10 to the state where a wrinkle is not formed. The natural state in the present invention means that in the case of the disposable diaper 10 housed in a package, the disposable diaper 10 is taken out from the package and is placed under an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It is in a state of being left for 24 hours.

  The disposable diaper 10 has a front-rear direction L and a width direction W orthogonal to each other. The front-back direction L is defined by a direction extending to the front side of the body and the rear side of the body. In other words, the front-back direction L is a direction that extends back and forth in the deployed disposable diaper 10. Further, the disposable diaper 10 has a thickness direction T orthogonal to both the front-rear direction L and the width direction W. The thickness direction T extends to a skin surface side T1 facing the wearer side and a non-skin surface side T2 opposite to the skin surface side.

  The disposable diaper 10 has a front waistline region S1, a rear waistline region S2, and a crotch region S3. The front waistline region S1 is a region facing the wearer's front waistline (abdomen). The rear waistline region S2 is a region facing the rear waistline (back) of the wearer and includes a region where the body (buttock) is placed when worn. The inseam area S3 is an area located at the inseam of the wearer and arranged between the front waist area S1 and the rear waist area S2. The crotch region S3 is a region where a leg opening is provided around the leg of the wearer. The leg opening is a portion that is recessed inward in the width direction from the outer edge of the disposable diaper.

  The disposable diaper 10 includes an absorbent core 31 including an absorbent material. The absorbent core 31 includes an absorbent material such as ground pulp or superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 31 may be covered by a core wrap 32. The absorber 30 may be constituted by the absorbent core 31 and the core wrap 32. The core wrap 32 may be formed of a tissue, and may be disposed on the skin side T1 of the absorbent core 31 and on the non-skin side of the absorbent core. The absorbent core 31 is arranged at least in the crotch region S3.

  As shown in FIGS. 1 and 3, a top sheet 21 and a side sheet 22 may be provided on the skin side T1 of the absorber 30 including the absorbent core 31. The topsheet 21 may be arranged across the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged so as to cover an outer portion of the top sheet 21. The top sheet 21 and the side sheets 22 may be formed of a liquid-permeable sheet such as a nonwoven fabric or a perforated plastic film. The inner portion of the side sheet 22 may be folded and overlapped. Between the overlapping side sheets 22, a leak-proof extension / contraction section 43 that extends and contracts in the front-back direction L may be provided. The leak-proof extension / contraction section 43 may be made of a thread rubber that extends and contracts in the front-rear direction L. The side sheet 22 and the leakproof expansion / contraction part 43 constitute leakproof gathers 60 that stand on the skin side T1 when worn.

  On the non-skin side T2 of the absorber 30, a back sheet 23 and an exterior sheet 24 may be provided. The exterior sheet 24 may be provided on the non-skin side T2 of the back sheet 23. The length of the back sheet 23 in the width direction W is shorter than the length of the outer sheet 24 in the width direction W, and the length of the back sheet 23 in the front-rear direction L is shorter than the length of the outer sheet 24 in the front-rear direction L. The back sheet 23 may be formed of a liquid impermeable film. The exterior sheet 24 may be made of a liquid-permeable nonwoven fabric.

  A fastening tape 91 is provided outside the rear waistline area S2. The fastening tape 91 has a base portion 92 and an engaging portion 93. The base portion 92 is arranged between the exterior sheet 24 and the side sheet 22 in the thickness direction T, and extends outward from the exterior sheet 24 and the side sheet 22 in the width direction W. The engaging portion 93 is arranged on the base portion 92 and engages with the target portion 95. The target portions 95 are arranged at intervals in the width direction in the front waistline region S1, and are configured such that the fastening tapes 91 are fixed thereto.

  An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicators 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight parts 33 described later. The indicator 51 is configured to be discolored by the absorption of the body fluid by the absorber 30, and to be able to grasp the absorption state of the body fluid from the non-skin side T2 of the disposable diaper 10.

  The disposable diaper 10 includes a leg opening 25 that is arranged around the wearer's leg when the disposable diaper 10 is worn. In a state where the disposable diaper 10 is folded, the leg opening 25 has a crotch edge 25c which is an edge closest to a fold line FL described later. The crotch side edge 25c may be the edge of the leg opening 25 located on the fold line FL in the extended state of the disposable diaper 10.

  Note that the leg opening 25 is at least configured by an end portion of the member (the exterior sheet 24 in the present embodiment) extending in the width direction W from the non-skin side T2 of the disposable diaper 10 at least. It should be noted that the leg opening 25 is not the top of the contracted portion 61 of the leak-proof gather 60 described later.

  The disposable diaper 10 may include a leg elastic part 42 extending in the front-rear direction L along the leg opening 25. The leg-surrounding elastic part 42 expands and contracts in the front-rear direction outside the absorbent core 31 in the width direction. The leg elastics 42 may be provided between the side sheet 22 and the back sheet 23 and between the side sheet 22 and the exterior sheet 24. The leg-surrounding elastic part 42 is configured by a band-like elastic sheet that expands and contracts in the front-rear direction L. By contraction of the leg elastic part 42, the leg opening 25 of the disposable diaper 10 fits around the leg when worn.

  The disposable diaper 10 may have a waist elastic portion 45 extending in the width direction W along the rear edge of the disposable diaper. The waist elastic portion 45 may be provided between the back sheet 23 and the exterior sheet 24, between the top sheet 21 and the exterior sheet 24, and between the side sheet 22 and the exterior sheet 24. The rear edge of the waist elastic portion 45 may be located forward of the rear edge of the disposable diaper, and the front edge of the hip elastic portion 45 may be located forward of the rear edge of the absorbent core 31. The waist elastic portion 45 may extend outside the absorbent core 31 in the width direction W. The waist elastic portion 45 is configured by a band-shaped elastic sheet that expands and contracts in the width direction W.

  In a state before use, the disposable diaper 10 is folded so that the skin sides of the disposable diaper 10 face each other from the crease FL extending in the width direction W in the crotch region S3. The fold FL of the disposable diaper 10 of the present embodiment is located at the center 10LC of the disposable diaper 10 in the front-rear direction. The fold FL may be shifted from the center 10LC of the disposable diaper in the front-rear direction. The fold FL of the disposable diaper is a fold line for folding the disposable diaper into two. The crotch region S3 is divided by the fold line FL in the front-back direction L. A region behind the fold line FL of the crotch region S3 is a first region R1. A region of the crotch region S3 on the front side of the fold line FL is a second region R2.

  The disposable diaper 10 includes a pair of crotch elastic portions 41 that expand and contract in the front-rear direction L in a region overlapping the absorbent core 31 in the crotch region S3. The inseam extension / contraction portion 41 is arranged on the non-skin side with respect to the absorbent core 31. The crotch elastic portion 41 may be provided between the back sheet 23 and the exterior sheet 24. The crotch elastic portions 41 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. In the present embodiment, the crotch elastic portions 41 are not arranged at the center of the absorbent core 31 in the width direction W, but are arranged two each on both sides with respect to the center of the absorbent core 31 in the width direction W. Therefore, due to the contraction of the crotch elastic portion 41, the absorbent core in the region overlapping the crotch elastic portion 41 is pulled up toward the body from the center in the width direction of the absorbent core. The pair of crotch elastic portions 41 may be located inside the outer edge of the absorbent core 31 in the width direction. The region located between the pair of crotch elastic portions 41 is pulled up toward the body with respect to the region outside the pair of crotch elastic portions 41 in the width direction. Therefore, the center in the width direction of the absorbent core is deformed in a convex shape with the side portion as a base point, and the fit to the crotch of the body can be secured. The inseam extension / contraction portion 41 is formed of a thread rubber arranged along the front-rear direction L. In other forms, the crotch elastic part 41 may be configured by a band-shaped elastic sheet that expands and contracts in the front-rear direction, may be configured by one thread rubber, or may be configured by three or more thread rubbers. It may be configured. Further, in the present invention, the overlapping state is a state in which one member and the other member overlap in a plan view, and the other member is arranged on the skin surface side or the non-skin surface side of one member. It is in the state that it is. The overlapping state includes not only a state in which one member and the other member are in contact with each other, but also a configuration in which another member is interposed between the one member and the other member.

  The inseam extension / contraction portion 41 is one edge in the front-rear direction L, and is a front edge 41F that is a front edge, and the other edge in the front-rear direction L, and a rear edge that is a rear edge. 41R. The front edge 41F and the rear edge 41R are arranged in the first region R1 without straddling the fold FL. Therefore, the crotch elastic portion 41 is disposed in the first region R1 without straddling the fold FL. In the present embodiment, since the fold line FL and the center 10LC of the disposable diaper 10 in the front-rear direction coincide with each other, the crotch elastic portion 41 does not straddle the center 10LC. In another embodiment, when the fold FL is located forward of the center 10LC in the front-rear direction of the disposable diaper 10, the crotch elastic portion 41 may straddle the center 10LC.

  The front edge 41F is disposed closer to the fold FL than the rear edge 41R. In a state where the disposable diaper 10 is folded, the front edge 41F is disposed between the crotch edge 25c which is the edge closest to the fold FL in the leg opening 25 and the front-rear direction L between the fold FL. (See FIG. 6). Since the front edge 41F is located closer to the fold FL than the crotch edge 25c of the leg opening 25, it is located in a region near the fold FL where the skin side of the disposable diaper 10 is likely to face each other. Have been.

  Here, when the crotch expansion / contraction portion 41 is disposed across the fold FL, the contraction force of the crotch expansion / contraction portion 41 causes the contraction in the direction of the fold FL side. For this reason, the region near the fold FL where the front end edge 41F is arranged is pulled down to the fold FL side and cannot be brought close to the wearer's outlet.

  On the other hand, as in the present embodiment, when the crotch expanding / contracting portion 41 is arranged so as not to straddle the fold FL, the front end edge 41F is on the side of the waistline region opposite to the fold FL (specifically, Is contracted in the direction of the rear waistline region S2), so that the region near the fold FL where the front edge 41F is arranged is pulled up to the rear waistline region S2 by the contraction force of the crotch elastic portion 41. By raising the area near the fold line FL toward the rear waistline area S2, one of the skin surfaces of the disposable diaper 10 is likely to be exposed from the state in which the skin surface sides face each other. Therefore, the folding habit due to folding can be raised. In addition, in a state where the disposable diaper 10 is worn, the area near the fold FL can be brought closer to the wearer's outlet by raising the area near the fold FL. As described above, since the skin surface near the fold FL is exposed and approaches the outlet of the wearer, the body fluid can be easily absorbed from the skin surface near the fold FL. As a result, even if the disposable diaper 10 is folded from the crease FL in the crotch region S3, the actual absorption performance can be exhibited.

  The inseam expansion / contraction portion 41 is located inside the outer edge of the absorbent core 31 in the width direction W. Outside the crotch elastic portion 41 in the width direction W of the absorbent core 31, a region where the contraction force of the crotch elastic portion 41 is unlikely to act is provided. FIG. 3 shows a side region R31 located outside the crotch elastic portion 41 in the absorbent core 31 and a central region R32 between the side regions R31. The side region R31 is a region located in the width direction W outside of the crotch elastic portion 41 located in the width direction W. The center region R32 is a region in which a region overlapping with the crotch elastic portion 41 and a region located inside the crotch elastic portion 41 in the width direction W are combined. The center region R32 is pulled up toward the body with respect to the side region R31 due to the contraction of the crotch elastic portion 41.

  In addition, the elastic part including the leak-proof elastic part 43, the leg elastic part 42, the waist elastic part 45, and the crotch elastic part 41 in the present invention is in a state in which elastic members such as thread rubber and elastic sheets can expand and contract. It is a portion where the elastic member is arranged in a state where the elastic member does not expand and contract. That is, the elastic part is an effective length part of the elastic member constituting the elastic part.

(3) Configuration of Absorbing Core Next, the configuration of the absorbing core 31 will be described in detail with reference to FIG. The absorbent core 31 has a narrow portion 35 whose length in the width direction is shorter than the maximum width 31M of the absorbent core 31, and a wide portion disposed outside the narrow portion 35 in the front-rear direction. The narrow portion 35 is arranged between the wide portions arranged before and after. The length of the narrow portion 35 in the width direction increases toward the outside in the front-rear direction L. The shape of the absorbent core 31 in plan view is an hourglass shape. The shape of the absorber including the core wrap as well as the absorbent core 31 may be an hourglass shape.

  The absorbent core 31 has a low basis weight part 33 in which the basis weight of the absorbent material is lower than the surrounding area. The low basis weight portion 33 is provided along the front-back direction L. The low basis weight portion 33 only needs to extend in the front-rear direction L, and may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L.

  The low basis weight portion 33 is a portion in which the basis weight of the absorbent material is lower than that of the surrounding absorbent core 31, and is thinner and less rigid than the peripheral absorbent core 31. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. A deformation base point extending in the front-rear direction L when worn is likely to be formed on the absorbent core 31. The low basis weight portion 33 may be a portion where the basis weight of the absorbing material is substantially zero (including a portion where the design basis weight is 0, but the surrounding absorbing material is mixed), It may be a portion where an absorbent material having a smaller basis weight is disposed. The low basis weight portion 33 may be a slit having a fixed length in the width direction W, or may be a notch whose length in the width direction W is practically zero. The length in the width direction W of each low basis weight portion 33 may be 2 mm or more and 10 mm or less, and more preferably, the thickness of the absorbent core 31 or more and 8 mm or less. When the length in the width direction of the low basis weight portion 33 is equal to or greater than the thickness of the absorbent core 31, the absorbent core 31 is easily deformed in the thickness direction based on the low basis weight portion 33. Further, when the length in the width direction of the low basis weight portion 33 is 8 mm or less, anxiety about the absorption performance due to the long length in the width direction of the low basis weight portion can be suppressed. The length of the low basis weight portion 33 in the front-rear direction L may be 30 mm or more and 180 mm or less.

  The low basis weight portions 33 are arranged in pairs in the width direction W at intervals. The low basis weight portions 33 may be arranged on both sides of the center 10WC in the width direction of the disposable diaper with an interval in the width direction W. The center of the low basis weight portion 33 in the front-rear direction L may be disposed behind the center 10LC of the disposable diaper in the front-rear direction L. The front edge 33F of the low basis weight portion 33 may be located on the front side of the front edge 41F of the crotch elastic portion 41, and the rear end edge 33R of the low basis weight portion 33 is formed with the rear edge 41R of the crotch elastic portion 41. It may be located in front of the matching or trailing edge 41R. The outer edge of the low basis weight portion 33 may coincide in the width direction with the rubber thread located on the outer side in the width direction among the thread rubbers constituting the crotch elastic portion 41, and the inner edge of the low basis weight portion 33 is Of the thread rubber constituting the inseam extension / contraction portion 41, the thread rubber located on the inner side in the width direction may coincide with the thread rubber in the width direction.

  The absorbent core 31 may have a high-rigidity portion 70 having higher rigidity than the surrounding area. The high-rigidity portion 70 has a central high-rigidity portion 71 disposed between the pair of crotch elasticity portions 41, a rear high-rigidity portion 72 disposed rearward of the crotch elasticity portion 41, and a lower rigidity portion 41. And a front high rigidity portion 73 disposed on the front side. The central high rigidity portion 71, the rear high rigidity portion 72, and the front high rigidity portion 73 are separated from each other in the front-rear direction L.

  The high-rigidity portion 70 is a region having higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than a surrounding region, or may be a portion in which the absorbent core 31 is compressed in the thickness direction. The high-rigidity portion 70 of the present embodiment is a portion provided with a compressed portion in which the absorbent core 31 is compressed. The compressed portion may be formed by compressing at least the absorbent core 31 in the thickness direction T, and may be formed by compressing another member such as the core wrap 32 and the absorbent core 31.

  The central high rigidity portion 71 is provided on the absorbent core 31 in the crotch region S3, and has higher rigidity than the surrounding region. The central high rigidity portion 71 may be provided in a region between the pair of low basis weight portions 33. The high rigidity portion is one edge in the front-rear direction L, a front edge 71F that is a front edge, and a rear edge 71R that is the other edge in the front-rear direction L and is a rear edge. And The front end edge 71F of the central high rigidity portion 71 may coincide with the front end edge of the low basis weight portion 33 or may be located behind the front end edge of the low basis weight portion 33. The rear end edge 71R of the central high rigidity portion 71 may be located on the front side of the rear end edge of the low basis weight portion 33. The center of the central high rigidity portion 71 in the front-rear direction L may be disposed on the front side of the center of the low basis weight portion 33 in the front-rear direction L. The central high-rigidity portion 71 may be arranged at an interval from the low-basis-weight portion 33 in the width direction W. The central high rigidity portion 71 may straddle the center 10LC of the disposable diaper in the width direction W and the center 10LC of the disposable diaper. The central high rigidity portion 71 constitutes the “high rigidity portion” of the present invention. As shown in FIG. 2, when the length of the central high rigidity portion 71 in the width direction W is A, and the distance between the central high rigidity portion 71 and the low basis weight portion 33 is B, A + B × 2> A is satisfied, and B is satisfied. × 2 <A may be satisfied.

  The inseam extension / contraction portion 41 may be located on both sides of the center of the central high-rigidity portion 71 in the width direction, and may extend rearward of the central high-rigidity portion 71. In the absorbent core 31, the first crotch region R41 in which the crotch elastic portion 41 is disposed behind the central high rigid portion 71, and the central high rigid portion 71 and the crotch elastic portion 41 overlap in the thickness direction or the width direction. It may have a second crotch region R42 and a third crotch region R43 in which the central high rigidity portion 71 is disposed on the front side of the crotch expansion / contraction portion 41. The first crotch region R41 and the second crotch region R42 are adjacent in the front-rear direction L, and the second crotch region R42 and the third crotch region R43 are adjacent in the front-rear direction L. The rear edge of the first crotch region R41 coincides with the rear edge 41R of the crotch elastic portion 41, and the front edge of the first crotch region R41 coincides with the rear edge 71R of the central high rigidity portion 71. The rear edge of the second crotch region R42 matches the front edge of the first crotch region R41, and the front edge of the second crotch region R42 matches the front edge 41F of the crotch elastic portion 41. The rear edge of the third inseam region R43 coincides with the front edge of the second inseam region R42, and the front edge of the third inseam region R43 coincides with the front edge 71F of the central high rigidity portion 71.

  The central high rigidity portion 71 may be arranged without straddling the fold FL. Further, the front edge 71F of the central high rigidity portion 71 may extend forward from the front edge 33F of the low basis weight portion 33. The central high rigidity portion 71 may be an aggregate of a plurality of high rigidity portions separated in the front-rear direction. An aggregate of a plurality of high rigidity portions may be integrated to function as the central high rigidity portion 71. The central high-rigidity portion 71 formed of an aggregate of a plurality of high-rigidity portions may be arranged such that the high-rigidity portions forming the aggregate do not cross the fold.

  The rear high rigidity portion 72 may be disposed on the rear side of the low basis weight portion 33. The outer edge of the rear high rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front edge of the rear high rigidity portion 72 in the width direction W may be longer than the length of the central high rigidity portion 71 in the width direction W. The rear high rigidity portion 72 may straddle the center 10WC in the width direction W of the disposable diaper.

  The front high rigidity portion 73 may be disposed on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC in the width direction W of the disposable diaper with an interval in the width direction W. The front edge of the front high-rigidity portion 73 may extend toward the outside in the width direction W.

  Here, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is an outer edge in the width direction W. Further, the inner portion is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W.

(4) Relationship between the longitudinal direction L of each member Next, the relationship between the longitudinal direction L of each member will be described with reference to FIGS. FIG. 5 is a diagram schematically illustrating the relationship between the crotch elastic portion and the central high-rigidity portion in the front-rear direction L in the extended state of the disposable diaper. FIG. 6 is a cross-sectional view schematically showing a state where the disposable diaper folded into two is folded.

  Hereinafter, in the extended state of the disposable diaper 10, in the front-back direction L, the length from the rear end edge 41R of the crotch elastic portion 41 to the rear end edge 71R of the central high rigidity portion 71 is referred to as L1, and the central high rigidity portion 71 The length from the rear edge 71R to the front edge 41F of the crotch elastic portion 41 is referred to as L2. The length from the front end edge 41F of the inseam elastic portion 41 to the front end edge 71F of the central high rigidity portion 71 is referred to as L3. The length from the front edge 41F of the crotch elastic portion 41 to the fold FL is referred to as L31, and the length from the fold FL to the front edge 71F of the central high rigidity portion 71 is referred to as L32.

  When the disposable diaper 10 in the natural state is folded, the length from the fold line FL to the front end edge 71F of the central high rigidity portion 71 in the front-rear direction L is referred to as L4, and the front end edge 71F of the central high rigidity portion 71 is formed. From the leg opening 25 to the crotch edge 25c is referred to as L5. The length from the fold FL to the front edge 71F of the central high rigidity portion 71 is referred to as L32.

  As shown in FIG. 5, the front edge 71F of the central high-rigidity portion 71 is located in the second region R2 or a region of the first region closer to the fold line FL than the front edge 41F of the crotch elastic portion 41 in the front-rear direction L. May be arranged. Further, the rear end edge 71R of the central high rigidity portion 71 may be disposed in the first region R1. In the case of such an arrangement, the central high rigidity portion 71 (at least a part thereof) is arranged between the crotch elastic portion 41 and the fold FL in the front-rear direction L. The central high-rigidity portion 71 is higher in rigidity than the surrounding region where the central high-rigidity portion 71 is not formed, and thus the central high-rigidity portion 71 is pulled up toward the rear waistline region S2 by contraction of the crotch elastic portion 41. Thus, the region between the crotch elastic portion 41 and the fold line FL can be pulled up together with the central high rigidity portion 71. Therefore, since a wide area near the fold FL can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold FL.

  In the present embodiment, the front edge 71F of the central high-rigidity portion 71 is arranged in the second region R2. As a result, the central high rigidity portion 71 is disposed across the fold line FL. Therefore, the skin surface near the fold not only on the first region R1 side but also on the second region R2 side can be pulled up to the rear waistline region S2 side. Therefore, since a wide area near the fold F1 can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold FL.

  In the front-rear direction L, the front edge 41F of the crotch elastic portion 41 may be arranged closer to the fold FL than the rear edge 71R of the central high rigidity portion 71. Since there is a region where the inseam elastic portion 41 and the central high rigidity portion 71 overlap in the width direction W (ie, the second inseam region R42), the contraction of the inseam elastic portion 41 causes the central high rigidity portion 71 to move to the rear waist region S2. It becomes easier to pull up to the side. The region between the crotch elastic portion 41 and the fold FL can be more reliably pulled up together with the central high rigidity portion 71. Therefore, since a wide area near the fold FL can be pulled up, the body fluid can be easily absorbed from the skin surface near the fold FL.

  Further, when the skin surface near the fold line FL is pulled up by the contraction of the crotch elastic portion 41, the fulcrum is located at the front end edge 71F of the central high rigidity portion 71, and the point of force is the central high rigidity due to the expansion and contraction of the crotch elastic portion 41. Since it is a force that lifts the portion 71, it is located at the center in the front-rear direction L of the overlap region of the crotch elastic portion 41 and the central high rigidity portion 71, and the action point is located at the center of the central high rigid portion 71 in the front-rear direction L The second kind of lever principle works. Thereby, the region near the fold FL can be pulled up even if the contraction force of the crotch elastic portion 41 is not large.

  In the extended state of the disposable diaper 10, in the front-rear direction L, the length L1 from the rear end edge 41R of the crotch elastic portion 41 to the rear end edge 71R of the central high rigidity portion 71 is the rear end edge 71R of the central high rigidity portion 71. May be longer than the length L2 from the front end 41F of the crotch elastic portion 41 to the front edge 41F. The length L1 corresponds to a non-overlapping region (that is, a first crotch region R41) of the crotch elastic portion 41 where the crotch elastic portion 41 and the central high rigidity portion 71 do not overlap in the width direction W. The length L2 corresponds to an overlapping area where the crotch elastic portion 41 and the central high rigidity portion 71 overlap in the width direction W (that is, a second crotch region R42). Since the central high rigidity portion 71 has higher rigidity than the surrounding region where the central high rigidity portion 71 is not provided, the contraction force of the crotch elastic portion 41 is likely to be reduced in the second crotch region R42. On the other hand, in the first inseam region R41, the contraction force of the inseam expansion / contraction portion 41 is unlikely to decrease. By making the first crotch region R41 larger than the second crotch region R42, in which the contraction force is apt to decrease, the decrease in the contraction force can be suppressed, and the region near the wide fold line FL can be more reliably pulled up.

  In the extended state of the disposable diaper 10, in the front-rear direction L, the length L2 from the rear end edge 71R of the central high rigidity portion 71 to the front end edge 41F of the crotch elastic portion 41 is higher than the center height from the front end edge 41F of the crotch elastic portion 41. It may be shorter than the length L3 of the rigid portion 71 up to the front edge 71F. The length L3 corresponds to a non-overlapping region (that is, a third inseam region R43) of the central high rigidity portion 71 in which the crotch elastic portion 41 and the central high rigidity portion 71 do not overlap in the width direction W. Therefore, in the front-rear direction L, the length of the second crotch region R42 is shorter than the length of the third crotch region R43. Since the central high rigidity portion 71 has higher rigidity than the surrounding region where the central high rigidity portion 71 is not provided, the region corresponding to the length L3 is pulled up together with the central high rigidity portion 71. Since the region to be pulled up (ie, the third crotch region R43) is larger than the region where the contraction force is reduced (ie, the second crotch region R42), the region near the wide fold line FL can be more reliably pulled up. it can. In addition, the distance from the center in the front-rear direction L of the second crotch region R42, which is a point of force, to the front edge 71F of the central high rigidity portion 71, which is a fulcrum, is also long. The area near the fold line FL can be raised.

  In the extended state of the disposable diaper 10, in the front-rear direction L, the length L31 from the front edge 41F to the fold FL may be shorter than the length (L1 + L2) of the crotch elastic portion 41 in the front-rear direction. Thus, the front edge 41F is arranged closer to the fold FL. Since the skin surface is more difficult to be exposed in the region closer to the fold FL, the front edge 41F contracts from closer to the fold FL, so that the region near the fold FL where the skin surface is more difficult to be exposed is pulled up to the rear waistline region S2. be able to. Accordingly, the skin surface near the fold FL can be more exposed, and the body fluid can be easily absorbed from the skin surface near the fold FL.

  In the extended state of the disposable diaper 10, in the front-rear direction L, the length L32 from the fold FL to the front end edge 71F of the central high rigidity portion 71 is longer than the length L31 from the front end edge 41F of the crotch elastic portion 41 to the fold FL. It may be long. The length L32 corresponds to the central high rigidity portion 71 of the second region R2. The length L31 corresponds to the central high rigidity portion 71 of the central high rigidity portion 71 of the first region R1 that does not overlap the inseam extension / contraction portion 41 in the width direction W. By increasing the size of the central high-rigidity portion 71 in the second region R2, it is possible to raise the skin surface near the fold FL on the second region R2 side in a wider range toward the rear waistline region S2. In addition, even if the distance from the center in the front-rear direction L of the second inseam region R42, which is a point of force, to the front edge 71F of the central high rigidity portion 71, which is a fulcrum, becomes longer, The area near the fold line FL can be raised.

  As shown in FIG. 6, in the state where the disposable diaper 10 is folded, the front edge 71F of the central high rigidity portion 71 is located between the crotch side edge 25c of the leg opening 25 and the fold line FL in the front-rear direction L. May be arranged. By arranging the front end edge 71F of the central high rigidity portion 71 between the crotch side edge 25c of the leg opening 25 and the fold line FL where the skin sides are likely to face each other, the skin sides face each other. Can be efficiently raised to the rear waistline area S2 side.

  As shown in FIG. 6, when the disposable diaper 10 is folded, the fold FL is a fold on the skin side T1 of the topsheet 21.

  In the state in which the disposable diaper 10 is folded, the length L4 from the fold line FL to the front end edge 71F of the central high rigidity portion 71 in the front-rear direction L is from the front end edge 71F of the central high rigidity portion 71 to the leg opening 25. It may be shorter than the length L5 up to the crotch side edge 25c. Since the central high-rigidity portion 71 has high rigidity, the surrounding area where the central high-rigidity portion 71 is not formed is more comfortable for the wearer. By making the length L4 shorter than the length L5, it is possible to raise the skin surface near the fold FL on the second region R2 side to the rear waistline region S2 while maintaining the feel of the wearer. it can.

  As shown in FIG. 6, the disposable diaper 10 may have upright leak-proof gathers 60. The leak-proof gathers 60 are located on the skin surface side T1 of the topsheet 21 and can stand with respect to the topsheet 21. The leak-proof gather 60 has a contraction portion 61 that rises due to the contraction of the leak-proof expansion / contraction portion 43 and a base portion 62 that serves as a starting point of the rise of the contraction portion 61. The leakproof expansion / contraction part 43 is arranged on the inner edge of the side sheet 22 and raises the inner edge of the side sheet 22 toward the wearer.

  In the state where the disposable diaper 10 is folded, in the front-rear direction L, the front edge 41F of the crotch elastic portion 41 is disposed between the base point portion 62 of the leak-proof gather 60 standing on the skin side T1 when worn and the fold FL. Have been. Since the contraction force of the leak-proof gather 60 does not act between the base portion 62 of the leak-proof gather 60 and the fold FL, the skin surfaces tend to face each other when the disposable diaper 10 is deployed. By arranging the front edge 41F of the crotch elastic portion 41 between the base portion 62 of the leak-proof gather 60 and the fold FL, the region near the fold where the skin side is likely to face each other is shifted to the rear waist region S2 side Can be raised.

(5) Wearing state of disposable diaper Next, the wearing state of the disposable diaper 10 will be described based on FIGS. 7 and 8. Drawing 7 is a figure showing typically the wearing state in AA section of a disposable diaper. Drawing 8 is a figure showing typically the wearing state of the disposable diaper concerning an embodiment, and was the figure which looked at the wearer of the sleeping state from the front side. The line BL shown in FIG. 7 indicates a line of the body of the wearer.

  When the disposable diaper is worn, the absorbent core 31 of the crotch region S3 is subjected to a force directed toward the skin surface side T1 and the inside in the width direction W by being pulled up or worn by a wearer's leg, The absorbent core 31 of the crotch region S3 is deformed based on the low basis weight portion 33 extending in the front-rear direction L when worn, and easily deforms so that the low basis weight portion 33 becomes convex toward the body. At this time, the rigidity of the region between the pair of low basis weight portions 33 is increased by the central high rigidity portion 71, and it is easy to maintain the state along the body.

  At this time, the length A of the central high rigidity portion 71 in the width direction A + (the distance B between the central high rigidity portion 71 and the low basis weight portion 33)> the length A of the central high rigidity portion 71 in the width direction W The distance B is provided between the central high rigidity portion 71 and the low basis weight portion 33. The area at the distance B is easier to deform than the central high-rigidity portion 71. When the region between the low basis weight parts does not fit in the crotch, the region at the distance B is deformed. The convex deformed state with the low basis weight part 33 as a base point and the central high rigidity part 71 can easily maintain the state along the body, and the gap to the body can be reduced.

  In addition, the low basis weight portion 33 and the central high rigidity portion 71 are spaced apart in the width direction W and are not continuous. Therefore, there is a difference in rigidity between the inner edge of the low basis weight portion 33 and the outer edge 71E of the central high rigidity portion 71 with respect to the region adjacent in the width direction. The inner edge of the low-basis weight portion 33 and the outer edge of the central high-rigidity portion 71 also serve as deformation base points. By deforming at a plurality of base points, the absorbent core is more easily fitted to the body. More specifically, as shown in FIG. 8, the absorbent core 31 is deformed with the low basis weight portion 33 as a base point, and the central region R32 becomes convex toward the body side with respect to the side region R31. Further, also in the central region R32, the rigidity changes with the outer edge 71E of the central high-rigidity portion 71 as a boundary. The region where the rigid portion 71 is arranged is convex toward the body.

  In addition, in order to satisfy B × 2 <A, the ratio occupied by the central high rigidity portion 71 in the region between the low basis weight portions 33 is higher than the ratio occupied by the distance B. Therefore, the absorbent core 31 is arranged along the body between the low-basis-weight portions 33, and the gap to the body can be reduced. Leakage can be reduced by deforming the absorbent core 31 along the crotch of the body.

  The central high-rigidity portion 71 may straddle a fold FL that is folded so that the skin surface sides of the disposable diaper 10 face each other. In the vicinity of the fold line FL of the disposable diaper 10, the disposable diaper 10 is easily deformed in a convex shape toward the non-skin side due to a folding habit. Since the central high-rigidity portion 71 straddles the fold FL, deformation due to the folding habit is suppressed, and it is easy to maintain a deformation that is convex to the body side.

  The crotch elastic portions 41 may be arranged on both outer sides in the width direction W with respect to the central high rigidity portion 71. Due to the contraction of the crotch elastic portion 41, a region outside the central high rigidity portion 71 in the width direction W can be pulled up toward the body. Therefore, the vicinity of the low basis weight portion 33 is easily deformed in a convex shape toward the body. Further, the central high rigidity portion 71 is not easily contracted by the crotch elastic portion 41. Therefore, while ensuring the absorption area, the convex shape along the crotch is maintained, and leakage can be reduced.

  At least a part of the inseam elastic portion 41 may be arranged in a region overlapping with the low basis weight portion 33. Since the low basis weight portion 33 has lower rigidity than the surroundings, the crotch elastic portion overlaps with the low basis weight portion, so that the crotch elastic portion is easily contracted and convex deformation is more easily maintained.

  In the region extending in the width direction W from the inseam extension / contraction portion 41, there is a region in which the central high rigidity portion 71 is disposed, and the length of the overlapping region in the front-rear direction L is the length of the central high rigidity portion 71 in the front-rear direction It may be 1/2 or less of L71. The contraction of the inseam expansion / contraction part 41 makes it difficult for the entire central high rigidity part 71 to contract. Therefore, while ensuring the absorption area, the central high-rigidity portion 71 can easily maintain the convex shape along the crotch, and leakage can be reduced.

  Assuming that the distance between the low basis weight portion 33 and the outer edge 31E of the absorbent core 31 is D, and the length between the outer edges 31E of the absorbent core 31 is E, D> E / 4 may be satisfied. Here, the outer edge 31E of the absorbent core 31 is an outer edge in a region extending in the width direction W from the low basis weight portion 33. That is, D> E / 4 may be satisfied on a straight line passing through the low basis weight portion 33 and extending in the width direction W.

  When the base is deformed convexly toward the body with the low basis weight part 33 as a base point, an area outside the low basis weight part 33 in the width direction W (area of the distance D) becomes an area that supports the convex deformation. The region outside the low basis weight portion 33 in the width direction W (the region at the distance D) is longer than １ ／ of the entire region in the width direction W of the absorbent core 31, and thus stably supports the convex deformation. , It becomes easy to maintain the convex shape.

  The distance between the first low basis weight portion 331 which is one of the pair of low basis weight portions 33 and the central high rigidity portion 71 is B1, and the second low basis weight portion which is the other of the pair of low basis weight portions 33. Assuming that the distance between 332 and the central high rigidity portion 71 is B2, B1 ≠ B2 may be satisfied. Since the distance B1 between the first low basis weight portion 331 and the central high rigidity portion 71 and the distance B2 between the second low basis weight portion 332 and the central high rigidity portion 71 are different, when a force is applied from both left and right sides, One of the area of the distance B1 and the area of the distance B2 is deformed first. For this reason, force is uniformly applied to the central high-rigidity portion from both the left and right sides, and the problem that the central high-rigidity portion itself is bent can be suppressed. Therefore, it is possible to maintain a convex shape along the crotch, secure an absorption area, and reduce leakage.

  The central high rigidity portion 71 may be arranged only in a region sandwiched between the low basis weight portions 33. That is, the front end edge 71F of the central high rigidity portion 71 coincides with the front end edge 33F of the low basic weight portion 33 or is located behind the front end edge 33F of the low basic weight portion 33, and the rear end of the central high rigidity portion 71 The edge 71 </ b> R may coincide with the rear end edge 33 </ b> R of the low basis weight portion 33 or may be located on the front side of the rear end edge 33 </ b> R of the low basis weight portion 33. Since the central high-rigidity portion 71 is provided only in the region sandwiched by the low-basis-weight portions 33, the central high-rigidity portion 71 is arranged only in the region deformed in a convex shape toward the body. The central high rigidity portion 71 can be arranged in a plane along the crotch, and the fit to the crotch can be further improved.

  The central high rigidity portion 71 may straddle the fold line FL. In the vicinity of the fold FL of the disposable diaper, the disposable diaper is easily deformed in a convex shape toward the non-skin surface side due to a folding habit. When the central high-rigidity portion 71 straddles the fold FL, deformation due to the fold habit is suppressed, and it is easy to maintain a convex deformation with respect to the body side.

  In the modification, the central high-rigidity portion 71 does not have to straddle the fold line FL. Since the central high rigidity portion 71 does not straddle the fold FL, it is possible to prevent the central high rigidity portion 71 having relatively high rigidity from forming a folding habit due to the fold. Therefore, the deformation due to the folding habit can be suppressed, and the deformation that is convex to the body side can be maintained.

  The center of the low basis weight portion 33 in the front-rear direction L may be disposed behind the center 10LC of the disposable diaper 10 in the front-rear direction L. Since the low basis weight portion 33 is biased to the rear side, a deformation based on the low basis weight portion 33 can be provided on the buttocks side.

  Leg extension / contraction part 42 may be arranged on an extension extending from crotch / contraction part 41 to the outside in width direction W. When the absorbent core 31 is deformed in a state where the leg elastics are fitted to the body, the central region R32 is more easily raised with respect to the side regions R31. Due to the contraction of the crotch elastic portion 41, the absorbent core 31 is more easily pulled up toward the wearer.

  The leg circumference elastic part 42 may extend outward in the width direction W toward the rear side. The elastic part around the leg extending toward the outside in the width direction W toward the rear side comes into close contact with the body, so that the buttocks of the wearer can be covered with the disposable diaper. In a state where the buttocks are covered in a wide range toward the rear side, the absorbent core 31 can be deformed so that the length in the width direction W of the absorbent core 31 becomes shorter toward the crotch region. While properly absorbing the absorbent core 31 between the wearer's crotches, the entire body can be covered with the disposable diaper and leakage can be suppressed.

  The measurement of the "basis weight of the absorbent core" in this specification is performed by the following measuring method. When the disposable diaper 10 is enclosed in a package or the like, a sample that is taken out of the package and left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used. In a disposable diaper wrapped with a packaging sheet or the like, the packaging sheet is opened and the folded disposable diaper is deployed. Next, a portion for measuring the grammage is cut out from the disposable diaper, and a portion other than the absorbent core such as a topsheet is removed from the cut out portion. Then, the area and weight of the portion for measuring the grammage of the absorbent core are measured. The basis weight is calculated based on the weight and the area.

  “Bending rigidity” in the present specification may be a value measured by Gurley hardness. The Gurley rigidity can be measured using a No. 311 Gurley-type flexibility tester manufactured by Yasuda Seiki Seisakusho in accordance with JIS-L1096. The length in the width direction W of the sample for measuring the Gurley rigidity can be 30 mm, and the length in the front-rear direction can be 25 mm.

(6) Other Embodiments In the above-described embodiment, the crotch elastic portion 41 is disposed in the first region R1 without straddling the fold line FL, but is not limited thereto. The crotch elastic portion 41 may be arranged in the second region R2 without straddling the fold FL. In this case, the rear edge 41R may be arranged between the crotch edge 25c and the fold line FL in the front-rear direction L. As a result, the crotch elastic portion 41 expands and contracts in the direction of the front waistline region S <b> 1. Thereby, the area near the fold can be brought closer to the discharge opening of the wearer.

  Therefore, when the crotch elastic portion 41 is disposed in the second region R2 without straddling the fold FL, in the above description, the front edge 41F and the rear edge 41R of the crotch elastic portion 41 in the front-rear direction L are described. May be reversed, and the front edge 71F and the rear edge 71R of the central high rigidity portion 71 in the front-rear direction L may be reversed.

  The crotch elastic portion 41 may be disposed in each of the first region R1 and the second region R2 without straddling the fold FL. Thereby, the crotch elastic portion 41 arranged in the first region R1 pulls up the region near the fold FL toward the rear waistline region S2, and the crotch elastic portion 41 arranged in the second region R2 moves into the region near the fold FL. Can be pulled up to the front waistline area S1 side. Thereby, the area near the fold can be brought closer to the wearer's outlet.

  In the above-described embodiment, the crotch elastic portion 41 is arranged only in the first region R1, but the crotch elastic portion 41 may be arranged only in the second region R2. As a result, a space between the wearer's skin and the disposable diaper 10 can be secured in the rear waistline area S2 while the area near the fold FL is raised toward the front waistline area S1, and a space for storing stool is secured. can do.

  Although the disposable diaper 10 has been described as an example in the above description, the content described in this specification may be applied to an absorbent article.

  Although the present invention has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed aspects without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is for the purpose of illustrative explanation, and has no restrictive meaning to the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which can exhibit an actual absorption performance can be provided in the absorbent article folded on the crease extended in the width direction in a crotch area.

Reference Signs List 10 disposable diaper 10LC: center of diaper in the front-rear direction 10WC: center of diaper in the width direction 21 top sheet 22 side sheet 23 back sheet 24 exterior sheet 27 side flap part 30 absorber 31 absorption core 32 core wrap 33 low basis weight part 35 width Narrow part 41 Inseam elastic part 42 Leg elastic part 43 Leak-proof elastic part 45 Waist elastic part 51 Indicator 71 Central high rigidity part 72 High rigidity part 73 Front high rigidity part 91 Fastening tape 92 Base part 93 Engaging part 95 Target Part L Front-rear direction W Width direction T Thickness direction T1 Skin side T2 Non-skin side S1 Front waist area S2 Rear waist area S3 Intermediate area S1: Front waist area S2: Rear waist area S3: Inseam area T: Thickness direction T1: skin side T2: non-skin side W: width direction

Claims (11)

An absorbent article,
A front-rear direction and a width direction orthogonal to each other,
Front waist area, rear waist area, and crotch area disposed between the front waist area and the rear waist area,
At least an absorbent core arranged in the crotch region,
A leg opening that is arranged around the leg of the wearer when wearing the absorbent article,
The crotch region has a first region and a second region separated by a fold extending in the width direction in the front-rear direction,
Based on the fold in the crotch region, the absorbent article is folded such that the skin side faces each other,
The crotch region includes a pair of crotch elastic portions that extend and contract in the front-rear direction in a region overlapping with the absorbent core,
The crotch elastic portion has a first edge that is one edge in the front-rear direction, and a second edge that is the other edge in the front-rear direction,
The first edge and the second edge are arranged in the first region without straddling the fold,
The second edge is disposed closer to the fold than the first edge,
In a state where the absorbent article is folded, the second edge is disposed between the edge closest to the fold and the front-back direction of the fold at the leg opening. .   2. The absorbent article according to claim 1, wherein a length from the second edge to the fold in the front-rear direction in the stretched state of the absorbent article is shorter than a length of the crotch elastic part. 3. The absorbent core in the crotch region is provided with a high rigidity portion having higher rigidity than the surrounding region,
The high-rigidity portion has a first rigid edge that is one edge in the front-rear direction, and a second rigid edge that is the other edge in the front-rear direction,
The first rigid edge is located in the first region;
The said 2nd rigid edge is arrange | positioned in the said 2nd area | region, or the area | region near the said fold rather than the said 2nd edge in the said front-back direction among the said 1st areas. The absorbent article according to the above.   4. The absorbent article according to claim 3, wherein in the front-rear direction, the second edge is disposed closer to the fold than the first rigid edge. 5.   In the stretched state of the absorbent article, in the front-rear direction, the length from the first edge to the first rigid edge is longer than the length from the first rigid edge to the second edge. The absorbent article according to claim 4.   In the extended state of the absorbent article, the length from the first rigid edge to the second edge in the front-rear direction is shorter than the length from the second edge to the second rigid edge. The absorbent article according to claim 4.   The absorbent article according to any one of claims 3 to 6, wherein the second rigid edge is arranged in the second region.   The absorbent according to claim 7, wherein in the front-rear direction in the extended state of the absorbent article, a length from the fold to the second rigid edge is longer than a length from the second edge to the fold. Products.   The said 2nd rigid edge is arrange | positioned in the said front-back direction between the edge closest to the said fold and the said fold in the said leg opening in the state where the said absorbent article was folded. 9. The absorbent article according to 7 or 8.   In the state where the absorbent article is folded, the length from the fold to the second rigid edge in the front-rear direction is the end closest to the fold at the leg opening from the second rigid edge. The absorbent article according to claim 9, which is shorter than the length to the edge.   The said 2nd edge is arrange | positioned between the base point part of the leak-proof gather which stands on the skin surface side at the time of wear, and the said fold in the said front-back direction in the state in which the said absorbent article was folded. The absorbent article according to any one of 1 to 10.

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