JP6775554B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers.

Conventionally, an absorbent article that is folded so that the skin surfaces of the absorbent article face each other with respect to a crease extending in the width direction in the inseam region is widely known (see, for example, Patent Document 1). The absorbent article configured in this way can be accommodated in a state where the length in the front-rear direction is shortened (about half), and the size of the package can be made compact.

Japanese Unexamined Patent Publication No. 2014-158959

When the wearer unfolds the absorbent article starting from the crease in the inseam area, the area near the crease may not be sufficiently unfolded due to the crease. When worn on the wearer in such an inadequately unfolded state, the area near the folds is far from the wearer's skin and away from the wearer's outlet. Further, in the region near the crease, the skin surfaces in the vicinity of the crease may be hidden because the skin surfaces that can come into contact with the wearer's skin face each other. In such a state, it is difficult for the wearer's body fluid to reach the skin surface near the crease, and it is difficult for the body fluid to be absorbed from the skin surface near the crease. As a result, there is a risk that the absorbent article cannot exhibit the actual absorption performance.

Therefore, in an absorbent article that is folded from a crease extending in the width direction in the inseam area, an absorbent article capable of exhibiting actual absorption performance is desired.

The absorbent article according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, a front waist circumference region, a rear waist circumference region, and an inseam region arranged between the front waist circumference region and the rear waist circumference region, and at least the said. It includes an absorbent core arranged in the inseam area and a leg opening arranged around the wearer's leg when the absorbent article is worn. The inseam region has a first region and a second region divided by a crease extending in the width direction in the front-rear direction as a boundary. In the inseam region, the absorbent articles are folded so that the skin surfaces of the absorbent articles face each other with the crease as a base point. The absorbent article comprises a pair of inseam stretchable portions that stretch in the anterior-posterior direction in a region of the inseam region that overlaps the absorbent core. The inseam stretchable portion has a first edge, which is one edge in the front-rear direction, and a second edge, which is the other edge in the front-rear direction.

It is a top view seen from the skin surface side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core which concerns on embodiment. It is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. It is a figure which showed typically the relationship of the inseam telescopic part and the central high-rigidity part L in the front-rear direction in the extended state of a disposable diaper. It is sectional drawing which shows typically the state in which the disposable diaper which was folded in two is folded. It is a figure which showed typically the wearing state in the AA cross section of a disposable diaper. It is a figure which showed typically the wearing state of the disposable diaper which concerns on embodiment.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.

The absorbent article according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, a front waist circumference region, a rear waist circumference region, and an inseam region arranged between the front waist circumference region and the rear waist circumference region, and at least the said. It includes an absorbent core arranged in the inseam area and a leg opening arranged around the wearer's leg when the absorbent article is worn. The inseam region has a first region and a second region divided by a crease extending in the width direction in the front-rear direction as a boundary. In the inseam region, the absorbent articles are folded so that the skin surfaces of the absorbent articles face each other with the crease as a base point. The absorbent article comprises a pair of inseam stretchable portions that stretch in the anterior-posterior direction in a region of the inseam region that overlaps the absorbent core. The inseam stretchable portion has a first edge, which is one edge in the front-rear direction, and a second edge, which 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 crease. The second edge is located closer to the crease than the first edge. In the folded state of the absorbent article, the second edge is located between the edge closest to the crease and the crease in the anteroposterior direction at the leg circumference opening.

According to this aspect, in the front-rear direction, the second edge is arranged on the crease side with respect to the edge of the leg circumference opening, so that the second edge is in a state where the skin surfaces face each other. It is located in the area near the easy crease. Here, when the inseam elastic portion is arranged so as to straddle the crease, the second end edge contracts toward the crease side due to the contraction force of the inseam elastic portion. Therefore, the area near the fold where the second edge is arranged is pulled down toward the crease side and cannot be brought close to the wearer's discharge port. On the other hand, when the inseam elastic portion is arranged so as not to straddle the crease, the second end edge is in the direction of the waist circumference area side (front waist circumference area side or rear waist circumference area side) opposite to the crease. Since it contracts, the region near the crease where the second end edge is arranged is pulled up toward the waist circumference region by the contraction force of the inseam elastic portion. By pulling up the area near the crease toward the waistline area, one skin surface is easily exposed from the state where the skin surface sides face each other. In addition, in the worn state, by pulling up the area near the crease, the area near the crease can be brought closer to the wearer's discharge port. From the above, since the skin surface near the crease is exposed and approaches the wearer's discharge port, it is possible to easily absorb the body fluid from the skin surface near the crease. As a result, even an absorbent article that is folded from a crease extending in the width direction in the inseam region can exhibit actual absorption performance.

According to a preferred embodiment, in the stretched state of the absorbent article, the length from the second edge to the crease in the anteroposterior direction is shorter than the length of the inseam stretchable portion. Since the length from the second edge to the crease is shorter than the length of the inseam stretchable portion, the second edge is located closer to the crease. Since the skin surface is less exposed as the region is closer to the crease, the region near the crease where the skin surface is less exposed can be pulled up toward the waistline region by contracting the second edge from closer to the crease. Therefore, the skin surface in the vicinity of the crease can be more exposed, and the body fluid can be easily absorbed from the skin surface in the vicinity of the crease.

According to a preferred embodiment, the absorption core in the inseam region is provided with a high-rigidity portion having a 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 arranged in the first region. The second rigid edge is arranged in the second region or a region of the first region in the front-rear direction closer to the crease than the second edge. The second rigid edge is arranged in the second region or a region of the first region closer to the crease than the second edge. As a result, (at least a part of) the high-rigidity portion is arranged between the inseam elastic portion and the crease in the front-rear direction. 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 to the waist circumference region side due to the contraction of the inseam elastic portion, the inseam elastic portion is combined with the high-rigidity portion. The area between the crease and the crease can be raised. Therefore, since the region near the crease can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease.

According to a preferred embodiment, in the anteroposterior direction, the second edge is located closer to the crease than the first rigid edge. Since there is a region where the inseam elastic portion and the high-rigidity portion overlap in the width direction, it becomes easier to pull the high-rigidity portion toward the waist circumference region side due to the contraction of the inseam elastic portion. The area between the inseam elastic part and the crease can be pulled up more reliably together with the high-rigidity part. Therefore, since the region near the crease can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease.

According to a preferred embodiment, in the stretched state of the absorbent article, the length from the first edge to the one-rigid edge in the anteroposterior direction is from the one-rigid edge to the second edge. Longer than the length of. The length from the first edge to the first rigid edge corresponds to the non-overlapping region of the inseam stretchable portion where the inseam stretchable portion and the high rigid portion do not overlap in the width direction. Further, the length from the first rigid edge to the second edge corresponds to an overlapping region where the inseam stretchable portion and the high-rigidity portion overlap in the width direction. Since the high-rigidity portion has higher rigidity than the region in which the high-rigidity portion is not provided, the contraction force due to the inseam elastic portion tends to decrease in the overlapping region. On the other hand, in the non-overlapping region of the inseam elastic portion where the inseam elastic portion does not overlap with the high rigidity portion, the contractile force due to the inseam elastic portion is unlikely to decrease. By making the non-overlapping region of the inseam elastic portion larger than the overlapping region where the contraction force tends to decrease, the decrease in the contraction force can be suppressed, and the region near the wide crease can be pulled up more reliably.

According to a preferred embodiment, in the stretched state of the absorbent article, the length from the first rigid edge to the second edge in the anteroposterior direction is from the second edge to the second rigid end. Shorter than the length to the edge.

According to a preferred embodiment, the length from the first rigid edge to the second edge corresponds to an overlapping region where the inseam stretchable portion and the high rigid portion overlap in the width direction. The length from the second edge to the second rigid edge corresponds to the non-overlapping region of the high-rigidity portion where the inseam telescopic portion and the high-rigidity portion do not overlap in the width direction. Therefore, in the anteroposterior 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 in which 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 this pulled-up region (that is, non-overlapping region) is larger than the region where the contraction force is reduced (that is, the overlapping region), the region near the wide crease can be pulled up more reliably, according to a preferred embodiment. For example, the second rigid edge is arranged in the second region. Since the second rigid edge is arranged in the second region, the high rigidity portion is arranged so as to straddle the crease. As a result, not only the skin surface near the crease on the second region side but also on the waist circumference region side can be pulled up. Therefore, since the region near the crease can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease.

According to a preferred embodiment, in the stretched state of the absorbent article, the length from the crease to the second rigid edge is longer than the length from the second edge to the crease in the anteroposterior direction. .. The length from the crease to the second rigid edge corresponds to the high stiffness portion of the second region. The length from the second edge to the crease corresponds to the high-rigidity portion of the first region that does not overlap with the inseam telescopic portion in the width direction. By increasing the size of the high-rigidity portion in the second region, the skin surface near the crease on the second region side in a wider range can be pulled up to the waist circumference region side.

According to a preferred embodiment, in the folded state of the absorbent article, in the anteroposterior direction, the second rigid edge is between the edge closest to the crease and the crease in the leg opening. Is located in. By arranging the second rigid edge between the edge of the leg opening and the crease where the skin sides tend to face each other, the area where the skin sides face each other is efficiently moved to the waistline side. Can be pulled up.

According to a preferred embodiment, when the absorbent article is folded, the length from the crease to the second rigid edge in the anteroposterior direction is the length from the second rigid edge to the leg circumference opening. Is shorter than the length to the edge closest to the crease. Since the high-rigidity portion has high rigidity, the area where the high-rigidity portion is not formed is more comfortable to the wearer. By making the length from the crease to the second rigid edge shorter than the length from the second rigid edge to the edge of the leg circumference opening, the second is wider while maintaining the feel of the wearer. The skin surface near the crease on the region side can be pulled up to the waist circumference region side.

According to a preferred embodiment, in the folded state of the absorbent article, in the anteroposterior direction, the second edge is between the base point of the leak-proof gather that stands up on the skin side when worn and the crease. Is located in. Since the contraction force of the leak-proof gather does not work between the base point of the leak-proof gather and the crease, the skin surfaces tend to face each other when the absorbent article is deployed. By arranging the second end edge between the base point portion of the leak-proof gather and the crease, the area near the crease where the skin surface sides tend to face each other can be pulled up to the waist circumference area side.

(2) Overall Outline of Disposable Diaper The disposable diaper according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion in which the relationship and ratio of dimensions of the drawings are different from each other.

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

The disposable diaper 10 has a front-rear direction L and a width direction W that are orthogonal to each other. The anteroposterior direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the anteroposterior direction L is a direction extending anterior-posteriorly 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 the skin surface side T1 facing the wearer side and the non-skin surface side T2 on the side opposite to the skin surface side.

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

The disposable diaper 10 includes an absorbing core 31 containing an absorbing material. The absorbent core 31 contains an absorbent material such as ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core 31 may be covered by a core wrap 32. The absorber 30 may be composed of the absorption core 31 and the core wrap 32. The core wrap 32 is composed of a tissue and may be arranged on the skin surface side T1 of the absorption core 31 and on the non-skin surface side of the absorption core. The absorption core 31 is arranged at least in the inseam area S3.

As shown in FIGS. 1 and 3, a surface sheet 21 and a side sheet 22 may be provided on the skin surface side T1 of the absorber 30 including the absorption core 31. The surface sheet 21 may be arranged so as to straddle the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged so as to cover the outer side portion of the surface sheet 21. The surface sheet 21 and the side sheet 22 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The inner portion of the side sheet 22 may be folded back and overlapped. A leak-proof expansion / contraction portion 43 that expands / contracts in the front-rear direction L may be provided between the overlapping side sheets 22. The leak-proof expansion / contraction portion 43 may be composed of a thread rubber that expands / contracts in the front-rear direction L. The side sheet 22 and the leak-proof telescopic portion 43 form a leak-proof gather 60 that stands up on the skin surface side T1 when worn.

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

A fastening tape 91 is provided on the outer side of the rear waist circumference region 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 waist circumference region S1, and are configured so that the fastening tapes 91 are fixed to each other.

An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicator 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 portions 33, which will be described later. The indicator 51 is configured so that the absorber 30 discolors when it absorbs the body fluid, and the absorption state of the body fluid can be grasped from the non-skin surface side T2 of the disposable diaper 10.

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

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

The disposable diaper 10 may have a leg-rotating telescopic portion 42 extending in the front-rear direction L along the leg-circling opening 25. The leg circumference expansion / contraction portion 42 expands / contracts in the front-rear direction on the outside in the width direction from the absorption core 31. The leg circumference telescopic portion 42 may be provided between the side sheet 22 and the back surface sheet 23, and between the side sheet 22 and the exterior sheet 24. The leg circumference telescopic portion 42 is composed of a band-shaped telescopic sheet that expands and contracts in the front-rear direction L. Due to the contraction of the leg circumference telescopic portion 42, the leg circumference opening 25 of the disposable diaper 10 fits around the leg circumference when worn.

The disposable diaper 10 may have a waist elastic portion 45 extending in the width direction W along the trailing edge of the disposable diaper. The waist elastic portion 45 may be provided between the back surface sheet 23 and the exterior sheet 24, between the front surface sheet 21 and the exterior sheet 24, and between the side sheet 22 and the exterior sheet 24. The trailing edge of the hip stretch 45 may be located anterior to the trailing edge of the disposable diaper, and the front edge of the hip stretch 45 may be located anterior to the trailing edge of the absorption core 31. The waist-surrounding elastic portion 45 may extend outward in the width direction W from the absorption core 31. The waist elastic portion 45 is composed of a strip-shaped elastic sheet that expands and contracts in the width direction W.

The disposable diaper 10 is folded so that the skin surfaces of the disposable diapers 10 face each other with respect to the crease FL extending in the width direction W in the inseam region S3 in the state before use. The crease 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 crease FL may deviate from the center 10LC in the anteroposterior direction of the disposable diaper. The fold FL of the disposable diaper is a fold line for folding the disposable diaper in two. The inseam area S3 is divided in the front-rear direction L with the crease FL as a boundary. The region posterior to the crease FL of the inseam region S3 is the first region R1. The region in front of the crease FL of the inseam region S3 is the second region R2.

The disposable diaper 10 includes a pair of inseam elastic portions 41 that expand and contract in the front-rear direction L in a region overlapping the absorption core 31 of the inseam region S3. The inseam elastic portion 41 is arranged on the non-skin surface side of the absorption core 31. The inseam expansion / contraction portion 41 may be provided between the back surface sheet 23 and the exterior sheet 24. The inseam telescopic portion 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 inseam expansion / contraction portions 41 are not arranged at the center of the absorption core 31 in the width direction W, but are arranged on both sides of the absorption core 31 with respect to the center of the width direction W. Therefore, due to the contraction of the inseam expansion / contraction portion 41, the absorption core in the region overlapping the inseam expansion / contraction portion 41 is pulled up toward the body side from the center in the width direction of the absorption core. The pair of inseam stretchable portions 41 may be located inside the outer edge of the absorption core 31 in the width direction. The region located between the pair of inseam telescopic portions 41 is pulled up toward the body with respect to the region outside the width direction of the pair of inseam telescopic portions 41. Therefore, the center in the width direction of the absorption core is deformed in a convex shape with the side portion as the base point, and the fit to the crotch of the body can be ensured. The inseam elastic portion 41 is composed of thread rubbers arranged along the front-rear direction L. In another form, the inseam elastic portion 41 may be formed of a band-shaped elastic sheet that expands and contracts in the front-rear direction, may be composed of one rubber thread, or may be composed of three or more rubber threads. 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 a state of being. 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 telescopic portion 41 is a front end edge 41F which is one end edge in the front-rear direction L and is a front end edge, and a rear end edge which is the other end edge and is a rear end edge in the front-rear direction L. It has 41R and. The front end edge 41F and the rear end edge 41R are arranged in the first region R1 without straddling the crease FL. Therefore, the inseam telescopic portion 41 is arranged in the first region R1 without straddling the crease FL. In the present embodiment, since the fold FL and the center 10LC of the disposable diaper 10 in the front-rear direction coincide with each other, the inseam telescopic portion 41 does not straddle the center 10LC. In another embodiment, the inseam telescopic portion 41 may straddle the center 10LC when the crease FL is in front of the center 10LC in the anteroposterior direction of the disposable diaper 10.

The front edge 41F is arranged closer to the crease FL than the rear edge 41R. In the folded state of the disposable diaper 10, the front edge 41F is arranged between the inseam side edge 25c, which is the edge closest to the crease FL, and the crease FL in the front-rear direction L at the leg circumference opening 25. (See FIG. 6). Since the front end edge 41F is arranged on the crease FL side of the inseam side end edge 25c of the leg circumference opening 25, it is arranged in the area near the crease FL where the skin surfaces of the disposable diapers 10 tend to face each other. Has been done.

Here, when the inseam elastic portion 41 is arranged so as to straddle the crease FL, is contracted in the direction of the crease FL side due to the contraction force of the inseam elastic portion 41. Therefore, the region near the crease FL where the front end edge 41F is arranged is pulled down toward the crease FL side and cannot be brought close to the wearer's discharge port.

On the other hand, when the inseam telescopic portion 41 is arranged so as not to straddle the crease FL as in the present embodiment, the front end edge 41F is on the waist circumference side (specifically, the side opposite to the crease FL). Shrinks in the direction of the rear waist circumference region S2 side), so that the region near the crease FL where the front end edge 41F is arranged is pulled up to the rear waist circumference region S2 side by the contraction force of the inseam elastic portion 41. Since the region near the crease FL is pulled up to the rear waist circumference region S2 side, one skin surface is easily exposed from the state where the skin surface sides of the disposable diapers 10 face each other. Therefore, the folding habit of folding can be improved. In addition, when the disposable diaper 10 is worn, the area near the crease FL can be brought closer to the wearer's discharge port by pulling up the area near the crease FL. From the above, since the skin surface near the crease FL is exposed and approaches the wearer's discharge port, it is possible to easily absorb the body fluid from the skin surface near the crease FL. As a result, even the disposable diaper 10 that is folded from the crease FL in the inseam area S3 can exhibit the actual absorption performance.

The inseam telescopic portion 41 is located inside the width direction W with respect to the outer edge of the absorption core 31. A region is provided outside the inseam expansion / contraction portion 41 of the absorption core 31 in the width direction W in which the contraction force of the inseam expansion / contraction portion 41 is difficult to act. FIG. 3 shows a side region R31 located outside the inseam telescopic portion 41 in the absorption core 31 and a central region R32 between the side regions R31. The side region R31 is a region located outside the width direction W with respect to the inseam telescopic portion 41 located most outside the width direction W. The central region R32 is a region including a region overlapping the inseam telescopic portion 41 and a region located inside the inseam telescopic portion 41 in the width direction W. The central region R32 is pulled up toward the body with respect to the side region R31 by the contraction of the inseam telescopic portion 41.

Further, the elastic member including the leak-proof elastic portion 43, the leg circumference elastic portion 42, the waist elastic portion 45, and the inseam elastic portion 41 in the present invention is in a state where elastic members such as rubber threads and elastic sheets can be expanded and contracted. It is an arranged part and does not include a part where an elastic member is arranged in a non-expandable state. That is, the stretchable portion is an effective length portion of the elastic member constituting the stretchable portion.

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

The absorption core 31 has a low basis weight portion 33 in which the basis weight of the absorption material is lower than that of the surrounding area. The low basis weight portion 33 is provided along the front-rear direction L. The low basis weight portion 33 may extend in the front-rear direction L, 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 where the basis weight of the absorbing material is lower than that of the surrounding absorption core 31, is thinner than the surrounding absorption core 31, and has lower rigidity. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. The absorption core 31 is likely to have a deformation base point extending in the front-rear direction L when worn. The low basis weight portion 33 may be a portion where the basis weight of the absorbing material is substantially zero (the design basis weight is 0, but includes a portion where the surrounding absorbing material is mixed), or the surrounding area. It may be a portion where an absorbent material having a smaller basis weight is arranged. The low basis weight portion 33 may be a slit having a constant length in the width direction W, or may be a notch in which the length in the width direction W is practically zero. The length of each low basis weight portion 33 in the width direction W may be 2 mm or more and 10 mm or less, and more preferably 8 mm or less, which is the thickness of the absorption core 31 or more. When the length of the low basis weight portion 33 in the width direction is equal to or larger than the thickness of the absorption core 31, the absorption core 31 is easily deformed in the thickness direction with the low basis weight portion 33 as the base point. Further, since the length of the low basis weight portion 33 in the width direction is 8 mm or less, it is possible to suppress anxiety about the absorption performance due to the long length of the low basis weight portion in the width direction. 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 at intervals in the width direction W. The low basis weight portions 33 may be arranged on both sides of the center 10WC in the width direction of the disposable diaper at intervals in the width direction W. The center of the low basis weight portion 33 in the front-rear direction L may be arranged behind the center 10LC of the front-rear direction L of the disposable diaper. The front end edge 33F of the low basis weight portion 33 may be located on the front side of the front end edge 41F of the inseam telescopic portion 41, and the rear end edge 33R of the low basis weight portion 33 is the rear end edge 41R of the inseam telescopic portion 41. It may be located in front of the coincidence or trailing edge 41R. The outer edge of the low basis weight portion 33 may coincide with the thread rubber located outside in the width direction among the thread rubbers constituting the inseam elastic portion 41 in the width direction, and the inner edge of the low basis weight portion 33 is Of the thread rubbers constituting the inseam elastic portion 41, the thread rubbers located inside in the width direction may coincide with the thread rubbers in the width direction.

The absorption core 31 may have a high-rigidity portion 70 having a higher rigidity than the surrounding region. The high-rigidity portion 70 includes a central high-rigidity portion 71 arranged between the pair of inseam elastic portions 41, a rear high-rigidity portion 72 arranged behind the inseam elastic portion 41, and an inseam elastic portion 41. It may have a front high-rigidity portion 73 arranged 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 a higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than the surrounding region, or may be a portion in which the absorption core 31 is compressed in the thickness direction. The high-rigidity portion 70 of the present embodiment is a portion provided with a squeezed portion in which the absorption core 31 is compressed. The squeezed portion may be formed by squeezing at least the absorption core 31 in the thickness direction T, and may be formed by squeezing another member such as the core wrap 32 and the absorption core 31.

The central high-rigidity portion 71 is provided in the absorption core 31 of the inseam region S3, and is a portion having higher rigidity than the surrounding region. The central high-rigidity portion 71 may be provided in the region between the pair of low basis weight portions 33. The high-rigidity portion is one end edge in the front-rear direction L and is the front end edge 71F, and the other end edge in the front-rear direction L and is the rear end edge 71R. , Have. 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 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 arranged in front 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 a distance 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 and the center 10WC of the disposable diaper in the width direction W. The central high-rigidity portion 71 constitutes the "high-rigidity portion" of the present invention. As shown in FIG. 2, assuming that the length W in the width direction of the central high-rigidity portion 71 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 × 2 <A may be satisfied.

The inseam telescopic 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 to the rear side of the central high-rigidity portion 71. In the absorption core 31, the first inseam region R41 in which the inseam stretchable portion 41 is arranged behind the central high-rigidity portion 71, and the central high-rigidity portion 71 and the inseam stretchable portion 41 overlap in the thickness direction or the width direction. It may have a second inseam region R42 and a third inseam region R43 in which the central high-rigidity portion 71 is arranged on the front side of the inseam telescopic portion 41. The first inseam region R41 and the second inseam region R42 are adjacent to each other in the anteroposterior direction L, and the second inseam region R42 and the third inseam region R43 are adjacent to each other in the anteroposterior direction L. The trailing edge of the first inseam region R41 coincides with the trailing edge 41R of the inseam telescopic portion 41, and the front edge of the first inseam region R41 coincides with the trailing edge 71R of the central high rigidity portion 71. The trailing edge of the second inseam region R42 coincides with the front edge of the first inseam region R41, and the front edge of the second inseam region R42 coincides with the front edge 41F of the inseam stretchable portion 41. The trailing 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 crease FL. Further, the front end edge 71F of the central high-rigidity portion 71 may extend to the front side of the front end 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 a central high-rigidity portion 71. In the central high-rigidity portion 71 composed of an aggregate of a plurality of high-rigidity portions, the high-rigidity portions constituting the aggregate may be arranged without straddling the crease.

The rear high-rigidity portion 72 may be arranged 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 end 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 arranged 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 of the disposable diaper in the width direction W at intervals in the width direction W. The front edge of the front high-rigidity portion 73 may extend forward toward the outside in the width direction W.

Here, the outer portion in the present invention is a portion that occupies 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. The inner portion is a portion that occupies 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 of front-rear direction L of each member Next, the relationship of each member in the front-rear direction L will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram schematically showing the relationship between the inseam 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 folded state of a disposable diaper folded in two.

In the following, in the extended state of the disposable diaper 10, the length from the rear end edge 41R of the inseam telescopic portion 41 to the rear end edge 71R of the central high-rigidity portion 71 in the front-rear direction L is referred to as L1 and the central high-rigidity portion 71. The length from the rear end edge 71R to the front end edge 41F of the inseam telescopic portion 41 is referred to as L2. The length from the front end edge 41F of the inseam telescopic 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 end edge 41F of the inseam telescopic portion 41 to the crease FL is referred to as L31, and the length from the crease FL to the front end edge 71F of the central high-rigidity portion 71 is referred to as L32.

Further, in the state where the disposable diaper 10 in the natural state is folded, the length from the crease FL to the front end edge 71F of the central high-rigidity portion 71 is referred to as L4 in the front-rear direction L, and the front end edge 71F of the central high-rigidity portion 71. The length from the leg circumference opening 25 to the inseam side edge 25c is referred to as L5. The length from the crease FL to the front end edge 71F of the central high-rigidity portion 71 is referred to as L32.

As shown in FIG. 5, the front end edge 71F of the central high-rigidity portion 71 is located in the second region R2 or the region of the first region in the front-rear direction L that is closer to the crease FL than the front end edge 41F of the inseam telescopic portion 41. May be placed. Further, the rear end edge 71R of the central high-rigidity portion 71 may be arranged in the first region R1. In the case of such an arrangement, the central high-rigidity portion 71 (at least a part of) is arranged between the inseam telescopic portion 41 and the crease FL in the front-rear direction L. Since the central high-rigidity portion 71 has higher rigidity than the surrounding region where the central high-rigidity portion 71 is not formed, the central high-rigidity portion 71 is pulled up to the rear waist circumference region S2 side by the contraction of the inseam expansion / contraction portion 41. And, together with the central high-rigidity portion 71, the region between the inseam telescopic portion 41 and the crease FL can be pulled up. Therefore, since the region near the crease FL can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease FL.

In the present embodiment, the front end 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 arranged so as to straddle the crease FL. Therefore, not only the first region R1 side but also the skin surface near the crease on the second region R2 side can be pulled up to the rear waist circumference region S2 side. Therefore, since the region near the crease F1 can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease FL.

In the front-rear direction L, the front end edge 41F of the inseam telescopic portion 41 may be arranged closer to the crease FL than the rear end 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 (that is, the second inseam region R42), the central high-rigidity portion 71 is moved to the rear waist circumference region S2 by the contraction of the inseam elastic portion 41. It becomes easier to pull up to the side. The area between the inseam telescopic portion 41 and the crease FL can be pulled up more reliably together with the central high-rigidity portion 71. Therefore, since the region near the crease FL can be pulled up in a wide range, it is possible to easily absorb the body fluid from the skin surface near the crease FL.

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

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

In the extended state of the disposable diaper 10, the length L2 from the rear end edge 71R of the central high-rigidity portion 71 to the front end edge 41F of the inseam telescopic portion 41 is the central height from the front end edge 41F of the inseam telescopic portion 41 in the front-rear direction L. The length of the rigid portion 71 up to the front end edge 71F may be shorter than the length L3. 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 inseam telescopic 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 inseam region R42 is shorter than the length of the third inseam region R43. Since the central high-rigidity portion 71 has higher rigidity than the surrounding region in which 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 this pulled-up region (that is, the third inseam region R43) is larger than the region where the contraction force decreases (that is, the second inseam region R42), it is possible to more reliably pull up the region near the wide crease FL. it can. Further, the distance from the center of the second inseam region R42, which is the force point, in the front-rear direction L to the front end edge 71F of the central high-rigidity portion 71, which is the fulcrum, is also long, and even if the contraction force of the inseam telescopic portion 41 is not large, The area near the crease FL can be pulled up.

In the extended state of the disposable diaper 10, the length L31 from the front end edge 41F to the crease FL in the front-rear direction L may be shorter than the length (L1 + L2) of the inseam telescopic portion 41 in the front-rear direction L. As a result, the front edge 41F is arranged closer to the crease FL. Since the area closer to the crease FL is less exposed on the skin surface, the front edge 41F contracts from closer to the crease FL to pull up the area near the crease FL where the skin surface is less exposed to the rear waist circumference area S2 side. be able to. Therefore, the skin surface in the vicinity of the crease FL can be more exposed, and the body fluid can be easily absorbed from the skin surface in the vicinity of the crease FL.

In the extended state of the disposable diaper 10, the length L32 from the crease FL to the front end edge 71F of the central high-rigidity portion 71 is larger than the length L31 from the front end edge 41F of the inseam telescopic portion 41 to the crease FL in the front-rear direction L. It can 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 with the inseam telescopic portion 41 in the width direction W. By increasing the size of the central high-rigidity portion 71 of the second region R2, the skin surface near the crease FL on the second region R2 side can be pulled up to the rear waist circumference region S2 side. Further, even if the distance from the center of the second inseam region R42, which is the force point, in the front-rear direction L to the front end edge 71F of the central high-rigidity portion 71, which is the fulcrum, is long, and the contraction force of the inseam telescopic portion 41 is not large, The area near the crease FL can be pulled up.

As shown in FIG. 6, when the disposable diaper 10 is folded, the front end edge 71F of the central high-rigidity portion 71 is between the inseam side edge 25c of the leg circumference opening 25 and the crease FL in the front-rear direction L. May be placed in. By arranging the front end edge 71F of the central high-rigidity portion 71 between the inseam side edge 25c of the leg circumference opening 25 and the crease FL, where the skin surfaces tend to face each other, the skin surfaces face each other. The area can be efficiently pulled up to the rear waist circumference area S2 side.

As shown in FIG. 6, when the disposable diaper 10 is folded, the crease FL is the crease of the skin surface side T1 of the surface sheet 21.

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

As shown in FIG. 6, the disposable diaper 10 may have an orthostatic leak-proof gather 60. The leak-proof gather 60 is located on the skin surface side T1 of the surface sheet 21 and can stand up against the surface sheet 21. The leak-proof gather 60 has a contraction portion 61 that stands up due to the contraction of the leak-proof expansion / contraction portion 43, and a base point portion 62 that serves as a base point for the rise of the contraction portion 61. The leak-proof telescopic portion 43 is arranged on the inner edge of the side seat 22, and causes the inner edge of the side seat 22 to stand up on the wearer side.

In the folded state of the disposable diaper 10, in the front-rear direction L, the front end edge 41F of the inseam telescopic portion 41 is arranged between the base point portion 62 of the leak-proof gather 60 standing on the skin surface side T1 when worn and the crease FL. Has been done. Since the contraction force of the leak-proof gather 60 does not work between the base point portion 62 of the leak-proof gather 60 and the crease FL, the skin surfaces tend to face each other when the disposable diaper 10 is deployed. By arranging the front end edge 41F of the inseam telescopic portion 41 between the base point portion 62 of the leak-proof gather 60 and the crease FL, the area near the crease where the skin surfaces are likely to face each other is the rear waist circumference region S2 side. Can be pulled up to.

(5) Wearing State of Disposable Diaper Next, the wearing state of the disposable diaper 10 will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram schematically showing a wearing state in the AA cross section of the disposable diaper. FIG. 8 is a diagram schematically showing a wearing state of the disposable diaper according to the embodiment, and is a view in which the wearer in the sleeping state is visually recognized from the front side. The line BL shown in FIG. 7 shows the line of the wearer's body.

When a disposable diaper is worn, the absorption core 31 in the inseam area S3 is subjected to a force toward the inside of the skin surface side T1 and the width direction W due to being pulled up at the time of wearing or being pinched by the wearer's legs. The absorption core 31 in the inseam region S3 is easily deformed from the low basis weight portion 33 extending in the front-rear direction L when worn, so that the low basis weight portion 33 is convex toward the body. At this time, the region between the pair of low basis weight portions 33 is increased in rigidity 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 W + (distance B × 2 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. A distance B is provided between the central high rigidity portion 71 and the low basis weight portion 33. The region of the distance B is more easily deformed than the central high-rigidity portion 71. When the area between the low basis weight portions does not fit in the crotch, the area at the distance B is deformed. The convex deformed state with the low basis weight portion 33 as the base point and the central high rigidity portion 71 can easily maintain the state along the body, and the gap with respect 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 connected to each other. 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, and by deforming at a plurality of base points, the absorption core can be more easily fitted to the body. More specifically, as shown in FIG. 8, the absorption core 31 is deformed with the low basis weight portion 33 as the base point, and the central region R32 is convex toward the body with respect to the side region R31. Further, also in the central region R32, since the rigidity changes with the outer edge 71E of the central high-rigidity portion 71 as a boundary, the rigidity changes with respect to the outer edge 71E of the central high-rigidity portion 71 as a base point, and the central height with respect to the region of the distance B. The region where the rigid portion 71 is arranged becomes 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 absorption core 31 can be arranged along the body between the low basis weight portions 33 to reduce the gap with respect to the body. Leakage can be reduced by deforming the absorption core 31 along the crotch of the body.

The central high-rigidity portion 71 may straddle the crease FL that is folded so that the skin surfaces of the disposable diapers 10 face each other. In the vicinity of the crease FL of the disposable diaper 10, it tends to be deformed convexly toward the non-skin surface side due to the crease. Since the central high-rigidity portion 71 straddles the crease FL, deformation due to the crease is suppressed, and it is easy to maintain a convex deformation with respect to the body side.

The inseam telescopic portion 41 may be arranged outside both of the width direction W with respect to the central high-rigidity portion 71. Due to the contraction of the inseam elastic portion 41, the region outside the width direction W of the central high-rigidity portion 71 can be pulled up toward the body. Therefore, the vicinity of the low basis weight portion 33 is likely to be deformed convexly toward the body. Further, the central high-rigidity portion 71 is difficult to contract due to the inseam expansion / contraction portion 41. Therefore, it is possible to secure an absorption area, maintain a convex shape along the crotch, and reduce leakage.

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

Within the region extending from the inseam telescopic portion 41 in the width direction W, there is a region in which the central high-rigidity portion 71 is arranged, 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 elastic portion 41 makes it difficult for the entire central high-rigidity portion 71 to contract. Therefore, the absorption area can be secured, and 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 absorption core 31 is D and the length between the outer edges 31E of the absorption core 31 is E, D> E / 4 may be satisfied. The outer edge 31E of the absorption core 31 referred to here 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 that passes through the low basis weight portion 33 and extends in the width direction W.

When the low basis weight portion 33 is deformed convexly toward the body as a base point, the region outside the width direction W (the region of the distance D) of the low basis weight portion 33 becomes a region that supports the convex deformation. Since the region outside the width direction W (the region of the distance D) of the low basis weight portion 33 is longer than 1/4 of the entire width direction W of the absorption core 31, it 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 set to 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 the 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 the left and right sides, One of the region of the distance B1 or the region of the distance B2 is deformed first. Therefore, a force is evenly applied to the central high-rigidity portion from both the left and right sides, and it is possible to suppress a problem that the central high-rigidity portion itself bends. 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 the region sandwiched by the low basis weight portion 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 basis weight portion 33 or is located on the rear side of the front end edge 33F of the low basis weight portion 33, and is the rear end of the central high rigidity portion 71. The edge 71R may coincide with the rear end edge 33R of the low basis weight portion 33 or may be located on the front side of the rear end edge 33R 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 portion 33, the central high-rigidity portion 71 is arranged only in the region deformed convexly toward the body side. 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 crease FL. In the vicinity of the fold FL of the disposable diaper, it tends to be deformed convexly toward the non-skin surface side due to the crease. Since the central high-rigidity portion 71 straddles the crease FL, deformation due to the crease is suppressed, and it is easy to maintain a convex deformation with respect to the body side.

Further, in the modified example, the central high-rigidity portion 71 does not have to straddle the crease FL. Since the central high-rigidity portion 71 does not straddle the crease FL, it is possible to prevent the central high-rigidity portion 71 having a relatively high rigidity from forming a crease due to the crease. Therefore, it is possible to suppress the deformation due to the bending habit and maintain the convex deformation with respect to the body side.

The center of the low basis weight portion 33 in the front-rear direction L may be arranged 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 with the low basis weight portion 33 as a base point can be provided on the buttocks side.

The leg circumference telescopic portion 42 may be arranged on an extension line extending outward in the width direction W from the inseam telescopic portion 41. By deforming the absorption core 31 with the leg-rotating portion fitted to the body, the central region R32 becomes easier to stand up with respect to the side region R31. The contraction of the inseam elastic portion 41 makes it easier for the absorption core 31 to be pulled up toward the wearer.

The leg-circling telescopic portion 42 may extend outward in the width direction W toward the rear side. The hips of the wearer can be covered with a disposable diaper by the leg-rotating elastic portion extending outward in the width direction W toward the rear side in close contact with the body. The absorption core 31 can be deformed so that the length of the absorption core 31 in the width direction W becomes shorter toward the inseam region while covering the buttocks in a wide range toward the rear side. While properly accommodating the absorbent core 31 in the crotch of the wearer, the disposable diaper can cover the entire body and prevent leakage.

The measurement of the "basis weight of the absorption core" in the present specification shall be performed by the following measurement method. When the disposable diaper 10 is enclosed in a package or the like, a sample taken out of the package and left in that state in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used. For disposable diapers wrapped with a wrapping sheet or the like, the wrapping sheet is opened and the folded disposable diaper is unfolded. Next, the part for measuring the basis weight is cut out from the disposable diaper, and the part other than the absorption core such as the surface sheet is removed from the cut out part. Then, the area and weight of the portion for measuring the basis weight of the absorption core are measured. Calculate the basis weight based on the weight and area.

The "flexural rigidity" in the present specification may be a value measured by Garley rigidity and softness. The Gurley stiffness and softness can be measured in accordance with JIS-L1096 using a No. 311 Gurley type flexibility tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. The length W in the width direction of the sample for measuring the Gurley stiffness and softness 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 inseam telescopic portion 41 is arranged in the first region R1 without straddling the crease FL, but is not limited to this. The inseam telescopic portion 41 may be arranged in the second region R2 without straddling the crease FL. In this case, the trailing edge 41R may be arranged between the inseam side edge 25c and the crease FL in the front-rear direction L. As a result, the inseam telescopic portion 41 expands and contracts in the direction toward the front waist circumference region S1, so that the region near the crease FL is pulled up toward the front waist circumference region S1 by the contraction force of the inseam elastic region 41. As a result, the area near the crease can be brought closer to the wearer's outlet.

Therefore, when the inseam stretchable portion 41 is arranged in the second region R2 without straddling the crease FL, in the above description, the inseam stretchable portion 41 has the front end edge 41F and the rear end edge 41R in the front-rear direction L. May be reversed, and the front end edge 71F and the rear end edge 71R of the central high-rigidity portion 71 in the front-rear direction L may be reversed.

The inseam telescopic portion 41 may be arranged in each of the first region R1 and the second region R2 without straddling the crease FL. As a result, the inseam telescopic portion 41 arranged in the first region R1 pulls up the region near the crease FL toward the rear waist circumference region S2, and the inseam telescopic portion 41 arranged in the second region R2 is the region near the crease FL. Can be pulled up to the front waist circumference area S1 side. As a result, the area near the crease can be further brought closer to the wearer's outlet.

In the above-described embodiment, the inseam expansion / contraction portion 41 is arranged only in the first region R1, but the inseam expansion / contraction portion 41 may be arranged only in the second region R2. As a result, while raising the area near the crease FL to the front waist circumference area S1 side, it is possible to secure a space between the wearer's skin and the disposable diaper 10 in the rear waist circumference area S2, and secure a space for accommodating stool. can do.

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

Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

According to the present invention, it is possible to provide a disposable diaper capable of exhibiting actual absorption performance in an absorbent article that is folded from a fold extending in the width direction in the inseam region.

10 Disposable diaper 10LC: Center in the front-back direction of the diaper 10WC: Center in the width direction of the diaper 21 Front sheet 22 Side sheet 23 Back sheet 24 Exterior sheet 27 Side flap part 30 Absorber 31 Absorbent core 32 Core wrap 33 Low basis weight part 35 Width Narrow part 41 Inseam stretchable part 42 Leg circumference stretchable part 43 Leakage-proof stretchable part 45 Waist circumference stretchable part 51 Indicator 71 Central high-rigidity part 72 Rear high-rigidity part 73 Front high-rigidity part 91 Fastening tape 92 Base part 93 Engagement part 95 Target Part L Front-back direction W Width direction T Thickness direction T1 Skin surface side T2 Non-skin surface 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)

It is an absorbent article
In the front-back direction and width direction that are orthogonal to each other,
The inseam area arranged between the front waist area, the rear waist area, and the front waist area and the rear waist area,
Surface sheet and
At least with the absorption core located in the inseam area
A leg circumference opening, which is arranged around the wearer's leg circumference when the absorbent article is worn, is provided.
The inseam region has a first region and a second region divided by a crease extending in the width direction in the front-rear direction as a boundary.
The first region is a region on the rear side of the crease, and the second region is a region on the front side of the crease.
In the inseam area, the absorbent articles are folded so that the skin surfaces of the absorbent articles face each other with the crease as a base point.
A pair of inseam telescopic portions that expand and contract in the anteroposterior direction in a region overlapping the absorption core in the inseam region are provided.
The inseam elastic part
The first edge, which is one edge in the front-rear direction, and
Ri other edge der in the longitudinal direction, and has a second edge that is located closer to the fold line than the first edge,
The first edge and the second edge are arranged in the inseam area without straddling the crease.
The leg circumference opening has an inseam side edge which is an edge located on the crease in the extended state of the absorbent article.
In the folded state of the absorbent article in its natural state, the second edge is the inseam side edge and the crease on the skin side of the surface sheet provided on the skin side of the absorption core . An absorbent article placed between the front and back directions of the. The absorbent article according to claim 1, wherein in the stretched state of the absorbent article, the length from the second edge to the crease is shorter than the length of the inseam stretchable portion in the front-rear direction. The absorption core in the inseam region is provided with a high-rigidity portion having a higher rigidity than the surrounding region.
The high-rigidity portion has a first rigid edge which is one edge in the front-rear direction and a second rigid edge which is the other edge in the front-rear direction.
The first rigid edge is arranged in one of the first region and the second region where the first edge and the second edge are arranged .
The second rigid edge is a region of the first region and the second region , or a region of the one region that is closer to the crease than the second edge in the front-rear direction. The absorbent article according to claim 1 or 2, which is arranged in. The absorbent article according to claim 3, wherein the second edge is arranged closer to the crease than the first rigid edge in the front-rear direction. In the extended state of the absorbent article, in the longitudinal direction, the length from the first end edge to said first rigid end edge, than the length from the first rigid end edge to the second edge The absorbent article according to long claim 4. In the extended state of the absorbent article, in the longitudinal direction, the length from the first rigid end edge to said second edge, rather than the length from the second end edge to said second rigid edge The absorbent article according to short claim 4 or 5. The absorbent article according to any one of claims 3 to 6, wherein the second rigid edge is arranged in the other region. The seventh aspect of claim 7, wherein in the stretched state of the absorbent article, the length from the crease to the second rigid edge is longer than the length from the second edge to the crease in the front-rear direction. Absorbent article. In the folded state of the absorbent article in the natural state, in the anteroposterior direction, the second rigid edge is the skin of the inseam side edge and the skin of the surface sheet provided on the skin surface side of the absorbent core. The absorbent article according to claim 7 or 8, which is arranged between the crease on the surface side . In the folded state of the absorbent article in the natural state, the length from the crease on the skin surface side of the surface sheet provided on the skin surface side of the absorption core to the second rigid edge in the front-rear direction. The absorbent article according to claim 9, wherein the length is shorter than the length from the second rigid edge to the inseam side edge . In the folded state of the absorbent article in the natural state, in the front-rear direction, the second edge edge is a base point portion of a leak-proof gather that stands up on the skin surface side when worn, and the skin surface side of the absorption core. The absorbent article according to any one of claims 1 to 10, which is arranged between the crease on the skin surface side of the surface sheet provided in the above .

Images