WO2020036165A1

WO2020036165A1 - Disposable diaper

Info

Publication number: WO2020036165A1
Application number: PCT/JP2019/031798
Authority: WO
Inventors: 拓巳市原; 真衣香 ▲高▼橋; 坂口　智; 山中　康弘
Original assignee: ユニ・チャーム株式会社
Priority date: 2018-08-14
Filing date: 2019-08-13
Publication date: 2020-02-20
Also published as: CN114099152B; CN114099152A; CN112566595B; CN112566595A

Abstract

Provided is a disposable diaper in which an absorbent core is made to deform so as to follow the groin of a body, thus enabling the disposable diaper to suitably cover the body of a wearer. The disposable diaper (10) comprises: a crotch elastic section (41) that is elastic in the front-back direction (L) in a region in which a crotch region (S3) and an absorbent core (31) overlap; and a central high rigidity section (71) having higher rigidity than the surrounding region in the crotch region and extending further forward than the crotch elastic section. The crotch elastic section extends further rearward than the high rigidity section on both sides of the center of the central high rigidity section in the width direction. The absorbent core comprises a first region (R41) in which the crotch elastic section is arranged further rearward than the central high rigidity section, a second region (R42) in which the high rigidity section and the crotch elastic section overlap in the thickness direction or in the width direction, and a third region (R43) in which the high rigidity section is arranged further forward than the crotch elastic section.

Description

Disposable diapers

The present invention relates to a disposable diaper.

Patent Document 1 discloses a tape-type absorbent article. When mounting the absorbent article configured as described above, first, the buttocks of the wearer are placed on the rear waistline area of the absorbent article in a state where the absorbent article is deployed. Then, the absorbent article is passed between the legs of the wearer, and the absorbent article is pulled up so as to cover the abdomen of the wearer.

Patent Document 2 discloses a pants-type absorbent article. When mounting the absorbent article configured in this way, first, pass both legs of the wearer through the leg opening of the absorbent article, the wearer grips at least one of the front waist area and the rear waist area, Raise the absorbent article.

Further, Patent Literature 3 discloses a disposable diaper having a pair of low-basis portions extending in the front-rear direction in a crotch region as a pair of low-basis portions and a high-rigidity portion provided between the pair of low-basis portions. Have been. The groove-shaped portion serves as a deformation base point of the absorbent core. The absorbent core of the disposable diaper configured as described above is deformed at the base point of the groove portion extending in the front-rear direction when worn, and deformed in the thickness direction. At this time, the high-rigidity portion provided between the groove-shaped portions tries to maintain the deformation of the absorbent core with the groove-shaped portion as a base point.

JP-A-2017-63848 JP 2018-68818 A JP 2018-472A

When the absorbent core is not deformed along the buttocks when the tape-type disposable diaper is worn as in the absorbent article of Patent Literature 1, the absorbent core does not properly fit in the wearer's crotch, The absorbent core may not fit. Also, when wearing a pants-type diaper like the absorbent article of Patent Document 2, if the absorbent core is not deformed along the buttocks, the absorbent core does not fit properly in the wearer's crotch, May not fit the absorbent core. If the absorbent core does not fit the crotch, the diaper is worn with a gap between the crotch and the disposable diaper. If the absorbent core does not fit properly in the crotch, the outer part of the disposable diaper will be caught around the legs when worn, and the length of the front waist region covering the abdomen will not be sufficient in the front-rear direction, and the front waist region will cause the abdomen Could not be properly covered.

Therefore, a disposable diaper that deforms the absorbent core along the crotch of the body and can appropriately cover the body of the wearer is desired.

Disposable diapers according to one aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region arranged between the front waist region and the rear waist region, at least the crotch Absorbent core disposed in the region, a fastening tape disposed in the rear waist region, a crotch elastic portion that expands and contracts in the front-rear direction in a region overlapping the absorbent core in the crotch region, and a region around the crotch region. Is also high rigidity, a high-rigidity portion extending to the front side than the crotch elastic portion, and a disposable diaper having the crotch elastic portion, the high-rigidity portion on both sides than the center of the width direction. Extending more rearward than the high-rigidity portion, the absorbent core, the first region in which the crotch elastic portion is disposed on the rear side than the high-rigidity portion, the high-rigidity portion and the crotch elastic portion It has a second region overlap each other in the direction or the width direction, and a third region in which the high rigidity portion is disposed at the front side than the crotch stretch unit.

Disposable diapers according to other aspects, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region disposed between the front waist region and the rear waist region, at least the Absorbent core arranged in the crotch region, a crotch elastic portion that expands and contracts in the front-rear direction in a region overlapping with the absorbent core in the crotch region, and has higher rigidity than a surrounding region in the crotch region, and is higher than the crotch elastic portion. A high-rigidity portion extending to the front side, and a disposable diaper having a pants-type disposable diaper, wherein the crotch elastic portion is on the rear side of the high-rigidity portion on both sides of the center of the high-rigidity portion in the width direction. Extending, the absorbent core, the first region where the crotch elastic portion is disposed on the rear side than the high rigidity portion, the high rigidity portion and the crotch elastic portion in the thickness direction or the width direction Overlap It has a second region, and a third region where the high rigidity portion is disposed at the front side than the crotch stretch unit.

The disposable diaper according to still another aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region disposed between the front waist region and the rear waist region, at least, An absorbent core disposed in the crotch region, and the absorbent core in the crotch region extends in the front-rear direction, and a pair of low-basis weight portions disposed at intervals in the width direction. A disposable diaper provided with a high-rigidity portion having higher rigidity than a surrounding region between the pair of low-basis weight portions, wherein the length of the high-rigidity portion in the width direction is A, Assuming that the distance between the portion and the low basis weight portion is B, A + the B × 2> A is satisfied, and B × 2 <A is satisfied.

It is the top view seen from the skin side of the disposable diaper which concerns on 1st Embodiment. It is a top view of the absorption core concerning a 1st embodiment. FIG. 2 is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. 1. FIG. 2 is a schematic cross-sectional view along a BB cross section of the disposable diaper shown in FIG. 1. It is the figure which showed typically the mounting state in the AA cross section of a disposable diaper. It is a figure for explaining a modification of a high rigid part. It is the figure which showed typically the mounting state of the disposable diaper which concerns on embodiment. It is a figure showing an absorption core concerning a modification. It is a top view of an absorption core concerning a 2nd 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 disposable diaper according to one aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region arranged between the front waist region and the rear waist region, at least the crotch Absorbent core disposed in the region, a fastening tape disposed in the rear waist region, a crotch elastic portion that expands and contracts in the front-rear direction in a region overlapping with the absorbent core in the crotch region, and a peripheral region in the crotch region. A high-rigidity portion extending to the front side than the crotch elastic portion, and a disposable diaper having the crotch elastic portion, on both sides of the center of the high-rigidity portion in the width direction. Extending more rearward than the high-rigidity portion, the absorbent core has a first region in which the crotch elastic portion is disposed on the rear side of the high-rigidity portion, and the high-rigidity portion and the crotch elastic portion. Thick It has a second region overlap each other in the direction or the width direction, and a third region in which the high rigidity portion is disposed at the front side than the crotch stretch unit.

装着 When wearing a tape-type disposable diaper, put the buttocks on the back waist area, pull the diaper on the inseam area, and cover the body with the inseam area. At this time, when the disposable diaper is pulled in the front-rear direction, the crotch elastic portion extends in the front-rear direction. If the crotch region is to be applied to the crotch in a state where the crotch extension portion is extended, the region where the crotch extension portion is arranged is pulled up with respect to the body by contraction of the crotch extension portion. At this time, the first region is raised to the body side most, and the second region is also raised to the body side with the raising of the first region. Further, since the crotch elastic portion is disposed on both sides of the center of the high-rigidity portion in the width direction, the high-rigidity portion is pulled up toward the body in a region sandwiched by the crotch elastic portion. At this time, in the third region, the high-rigidity portion is not shrunk by the crotch elastic portion, and is easily arranged in a planar shape along the crotch. In the crotch region, the absorbent core in the crotch region is arranged along the body by deforming into a convex shape protruding toward the body side over a certain region of the high rigidity portion. At the time of wearing, the absorbent core can be properly stored in the crotch of the wearer. The disposable diaper can be placed at an appropriate position between the wearer's crotches, and the front waist region can be pulled to a position covering the abdomen of the wearer. Therefore, in the tape-type disposable diaper, the wearer's body can be appropriately covered.

装着 When wearing a pants-type disposable diaper, pass both legs of the wearer through the leg opening, and pull up at least one of the waist region and the rear waist region. At this time, when the wearer is in a sleeping position, the front waist region is pulled up while the rear waist region is in close contact with the body, and the crotch region is pulled in the front-rear direction. When the crotch region is pulled in the front-rear direction, the crotch elastic portion extends in the front-rear direction, and the region where the crotch elastic portion is arranged is pulled up with respect to the body. At this time, the first region is raised to the body side most, and the second region is also raised to the body side with the raising of the first region. Further, since the crotch elastic portion is disposed on both sides of the center of the high-rigidity portion in the width direction, the high-rigidity portion is pulled up toward the body in a region sandwiched by the crotch elastic portion. At this time, in the third region, the high-rigidity portion is not shrunk by the crotch elastic portion, and is easily arranged in a planar shape along the crotch. In the crotch region, the absorbent core in the crotch region is arranged along the body by deforming into a convex shape protruding toward the body side over a certain region of the high rigidity portion. At the time of wearing, the absorbent core can be properly stored in the crotch of the wearer. The disposable diaper can be placed at an appropriate position between the wearer's crotches, and the front waist region can be pulled to a position covering the abdomen of the wearer. Therefore, in the pants-type disposable diaper, the body of the wearer can be appropriately covered.

According to a preferred embodiment, the length of the first region in the front-rear direction may be longer than the length of the second region in the front-rear direction. According to this aspect, the first region is easier to pull the absorbent core toward the body by the contraction force of the crotch elastic portion than the second region. By securing the length of the first region in the front-rear direction, the first region can be raised toward the body and the second region can be raised together with the first region.

According to a preferred embodiment, the length of the third region in the front-rear direction may be longer than the length of the second region in the front-rear direction. According to this aspect, by securing the length of the third region in the front-rear direction, it is possible to secure the region arranged in a plane with respect to the body and improve the fit to the crotch. In addition, by securing the length of the third region in the front-rear direction, a region that is pulled up toward the body is formed up to the abdomen, and a convex shape with respect to the body is maintained up to the abdomen, so that the fit is improved. Can be improved.

According to a preferred aspect, the disposable diaper is folded such that the skin surface sides of the disposable diaper face each other based on a fold extending in the width direction, and the high-rigidity portion straddles the fold. Good. According to this aspect, in the vicinity of the fold of the disposable diaper, the disposable diaper is easily deformed in a convex shape toward the non-skin side due to the folding habit. When the high-rigidity portion straddles the fold, the deformation due to the folding habit is suppressed, and the convex deformation toward the body side is easily maintained. The fold is located in the second area or the third area. Since no fold is provided in the first region, it is possible to prevent the region on the front side of the fold from being pulled toward the fold (the side away from the body) due to contraction of the crotch elastic portion. Therefore, the crotch region can be made to conform to the body, and the absorbent core can be properly accommodated in the wearer's crotch when worn.

According to a preferred embodiment, the fold may be provided in the third region. According to this aspect, since the crotch elastic portion is not arranged across the fold, it is possible to suppress the region in front of the fold from being pulled toward the fold side (the side away from the body) due to the contraction of the crotch elastic portion. Therefore, the crotch region can be made to conform to the body, and the absorbent core can be properly accommodated in the wearer's crotch when worn.

According to a preferred embodiment, the fold may be provided in the second region behind the center of the second region in the front-rear direction. According to this aspect, the fold is located behind the center in the front-rear direction of the second region, is provided at a position away from the front end edge of the third region serving as a fulcrum of deformation of the absorbent core, and close to the action point. Have been. Therefore, the deformation due to the folding habit can be raised by the contraction of the crotch elastic portion.

According to a preferred aspect, the fastening tape has an engaging portion that engages with the front waistline region, and a rear end edge of the crotch elastic portion has a center in the front-rear direction of the disposable diaper and the engaging portion. May be arranged on the front side with respect to the intermediate line in the front-rear direction with the front end edge of the front end. The area behind the middle line between the center of the disposable diaper in the front-rear direction and the front edge of the engaging portion is an area where the buttocks are placed when the diaper is worn. The rear edge of the inseam extension / contraction portion is located on the front side of the middle line, and is located in a region where the buttocks of the wearer cannot be placed. At the time of wearing, while the area behind the middle line is pressed by the buttocks, the area where the buttocks are not placed is pulled to the front side, and the entire inseam elastic portion is easily extended. Therefore, the region where the crotch elastic portion is arranged is raised with respect to the body, so that the absorbent core can be properly accommodated in the wearer's crotch.

According to a preferred aspect, the fastening tape has an engaging portion that engages with the front waistline region, and a rear end edge of the crotch elastic portion has a center in the front-rear direction of the disposable diaper and the engaging portion. May be arranged on the rear side of the middle line in the front-rear direction with the front end edge of the front end. The rear edge of the crotch elastic portion is located behind the intermediate line, and is arranged in a region where the buttocks of the wearer are placed. At the time of wearing, in a state where the rear edge of the inseam elastic part is pressed by the buttocks, the front edge side of the inseam elastic part is pulled forward, and the inseam elastic part is easily extended. Therefore, the region where the crotch elastic portion is arranged is raised with respect to the body, so that the absorbent core can be properly accommodated in the wearer's crotch.

According to a preferred aspect, the absorbent core in the crotch region is provided with a pair of low basis weight portions extending in the front-rear direction and arranged at intervals in the width direction, and the high rigidity is provided. At least a part of the portion may be disposed in a region sandwiched by the pair of low-basis weight portions. According to this aspect, the absorbent core in the crotch region is deformed based on the low basis weight portion extending in the front-rear direction when worn, and the low basis weight portion is easily deformed in a convex shape toward the body. At this time, the rigidity of the region between the pair of low basis weight portions is increased by the high rigidity portion, and the state along the body is easily maintained. Therefore, it is easier to appropriately store the absorbent core in the crotch of the wearer.

According to a preferred aspect, the rear edge of the low basis weight portion is disposed at the same position as the rear edge of the crotch elastic portion in the front-rear direction, or the rear edge of the crotch elastic portion in the front-rear direction. It may be arranged on the rear side. According to this aspect, the region deformed from the low basis weight portion can be pulled up by the crotch elastic portion. In addition, the region where the low basis weight portion is provided has lower rigidity than the region where the low basis weight portion is not provided, and the contraction force of the crotch elastic portion is more easily developed. Therefore, the absorbent core can be more easily pulled up by the body by the crotch elastic portion.

According to a preferred aspect, the crotch elastic portion may be arranged in a region overlapping the low basis weight portion in the thickness direction or the width direction. According to this aspect, the region deformed from the low basis weight portion can be pulled up by the crotch elastic portion. In addition, the region where the low basis weight portion is provided has lower rigidity than the region where the low basis weight portion is not provided, and the contraction force of the crotch elastic portion is more easily developed. Therefore, the absorbent core can be more easily pulled up by the body by the crotch elastic portion.

According to a preferred embodiment, the length in the width direction of the high-rigidity portion may be shorter than the distance in the width direction between the pair of low-basis weight portions. According to this aspect, the high-rigidity portion and the low-basis-weight portion are separated from each other, and are more easily deformed in the separated region than the high-rigidity portion. When the region between the low basis weight parts does not fit in the crotch, the separated region is deformed. The deformed state based on the low basis weight part and the high rigidity part can easily maintain the state along the body, and the fit to the body can be improved. In addition, since the low basis weight portion and the high rigidity portion are not connected, a difference in rigidity is generated between the inner edge of the low basis weight portion and the outer edge of the high rigidity portion with respect to the region adjacent in the width direction. The inner edge of the low-basis weight portion and the outer edge of the high-rigidity portion also serve as deformation base points, and are deformed at a plurality of base points, so that the absorbent core is more easily fitted to the body.

According to a preferred embodiment, the high-rigidity portion may be a compressed portion in which at least the absorbent core is compressed. The high-rigidity portion is not shrunk by the inseam extension / contraction portion, and is easily arranged along the crotch in a planar shape. Therefore, it is easy to arrange at least the absorbent core 31 in the region where the compressed portion is provided along the crotch. Body fluid can be absorbed by the squeezed portion arranged along the crotch, and leakage of the body fluid can be suppressed while the absorbent core is compactly stored in the space sandwiched between the legs.

Disposable diapers according to other aspects, the front and rear direction and width direction orthogonal to each other, front waist region, rear waist region, and a crotch region disposed between the front waist region and the rear waist region, at least the crotch And a pair of low-basis weight portions extending in the front-rear direction and arranged at intervals in the width direction, the absorbent core having the crotch region, A high-rigidity portion having a higher rigidity than a surrounding region between a pair of low-basis weight portions, and a disposable diaper provided with the length of the high-rigidity portion in the width direction A, the high-rigidity portion and Assuming that the distance from the low basis weight portion is B, A + the B × 2> A is satisfied, and B × 2 <A is satisfied.

では In the state of wearing like the disposable diaper of Patent Document 3, the groove-shaped portion is deformed to be convex toward the body side, and the fit to the crotch of the wearer is improved. However, the high-rigidity portion is provided so as to straddle the pair of groove-shaped portions, and increases the rigidity of the entire region sandwiched between the groove-shaped portions. Therefore, when the region sandwiched by the groove portions is longer than the length in the width direction of the crotch, the high-rigidity portion does not fit in the crotch and the leg may hit the high-rigidity portion, causing a sense of incongruity. Alternatively, it is not possible to maintain the convex deformation starting from the groove-shaped portion, and there is a risk that a gap may be formed with respect to the body and leakage may occur. Therefore, a disposable diaper that can reduce the leakage by deforming the absorbent core along the crotch of the body is desired. A disposable diaper according to another aspect is configured so that the absorbent core can be deformed along the crotch of the body to reduce leakage.

According to the disposable diaper according to this aspect, the absorbent core in the crotch region is deformed based on the low basis weight portion extending in the front-rear direction at the time of wearing, and the low basis weight portion is easily deformed in a convex shape toward the body. At this time, the rigidity of the region between the pair of low basis weight portions is increased by the high rigidity portion, and the state along the body is easily maintained. In order to satisfy A + B × 2> A, a distance B is provided between the high rigidity portion and the low basis weight portion. The area at the distance B is easier to deform than the high-rigidity part. When the region between the low basis weight parts does not fit in the crotch, the region at the distance B is deformed. The deformed state based on the low basis weight part and the high rigidity part can easily maintain the state along the body, and the gap to the body can be reduced. In addition, since the low basis weight portion and the high rigidity portion are not connected, a difference in rigidity is generated between the inner edge of the low basis weight portion and the outer edge of the high rigidity portion with respect to the region adjacent in the width direction. The inner edge of the low-basis weight portion and the outer edge of the high-rigidity portion also serve as deformation base points, and are deformed at a plurality of base points, so that the absorbent core is more easily fitted to the body. In addition, in order to satisfy B × 2 <A, the ratio occupied by the high rigidity portion in the region between the low basis weight portions is higher than the ratio occupied by the distance B. Therefore, the absorbent core is arranged along the body between the low-basis weight parts, and the gap to the body can be reduced. Leakage can be reduced by deforming the absorbent core along the crotch of the body.

According to a preferred aspect, the disposable diaper is folded such that the skin surface sides of the disposable diaper face each other based on a fold extending in the width direction, and the high-rigidity portion straddles the fold. Good. According to this aspect, in the vicinity of the fold of the disposable diaper, the disposable diaper is easily deformed in a convex shape toward the non-skin side due to the folding habit. When the high-rigidity portion straddles the fold, the deformation due to the folding habit is suppressed, and the convex deformation toward the body side is easily maintained.

According to a preferred aspect, the crotch region has a pair of crotch elastic portions that expand and contract in the front-rear direction, and the crotch elastic portions may be arranged outside both of the high rigidity portions in the width direction. According to this aspect, the contraction of the crotch elastic portion allows the region outside the high rigidity portion in the width direction to be pulled up toward the body. Therefore, the vicinity of the low basis weight portion is easily deformed in a convex shape toward the body. Further, the high-rigidity portion is unlikely to contract due to the inseam expansion / contraction portion. Therefore, while ensuring the absorption area, the convex shape along the crotch is maintained, and leakage can be reduced.

According to a preferred embodiment, at least a part of the crotch elastic portion may be arranged in a region overlapping with the low basis weight portion. According to this aspect, since the crotch elastic portion overlaps with the low basis weight portion, the crotch elastic portion is easily contracted, and the convex deformation is more easily maintained.

According to a preferred aspect, in a region extending in the width direction from the crotch elastic portion, the high rigidity portion has an overlapping region in which the high rigidity portion is disposed, and the length of the overlapping region in the front-rear direction is the high rigidity. It may be 以下 or less of the length of the portion in the front-back direction. According to this aspect, the entire high-rigidity portion is unlikely to contract due to contraction of the crotch elastic portion. Therefore, while ensuring the absorption area, the high-rigidity portion can easily maintain the convex shape along the crotch, and the leakage can be reduced.

According to a preferred aspect, when the distance between the low-basis weight portion and the outer edge of the absorbent core is D, and the length between the outer edges of the absorbent core is E, D> E / 4 is satisfied. Good. According to this aspect, when the base is deformed convexly toward the body with the low basis weight portion as a base point, the region outside the low basis weight portion in the width direction (the region of the distance D) is a region that supports the convex deformation. Becomes The region outside the low basis weight portion in the width direction (region of distance D) is longer than １／ of the entire region in the width direction of the absorbent core, so that the convex shape is stably supported and the convex shape is supported. Easy to maintain.

According to a preferred aspect, the distance between the first low basis weight portion, which is one of the pair of low basis weight portions, and the high rigidity portion is B1, and the distance, which is the other of the pair of low basis weight portions, is B1. Assuming that the distance between the low-basis-weight portion and the high-rigidity portion is B2, B1 ≠ B2 may be satisfied. According to this aspect, since the distance B1 between the first low basis weight portion and the high rigidity portion and the distance B2 between the second low basis weight portion and the high rigidity portion 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, a force is uniformly applied to the high-rigidity portion from both the left and right sides, and the problem that the 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.

According to a preferred embodiment, the high rigidity portion may be arranged only in a region sandwiched by the low basis weight portions. According to this aspect, since the high-rigidity portion is provided only in the region sandwiched by the low-basis-weight portions, the high-rigidity portion is disposed only in the region deformed in a convex shape toward the body. The high-rigidity portion can be arranged in a plane along the crotch, and the fit to the crotch can be further improved.

(2) Overall Schematic Configuration of Disposable Diaper Hereinafter, a disposable diaper according to the first 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.

Disposable diapers are tape-type disposable diapers. 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 sectional view taken along the line AA 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.

表面 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 absorption 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-rear 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.

ファ Fastening tape 91 is provided on the outside of the rear waist area. 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 (see FIG. 5). 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.

インジケータ Indicator 51 may be arranged between back sheet 23 and 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, so that 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 may have the leg elastic portion 42 that 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. Due to the contraction of the leg elastic portion 42, the leg opening 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.

(4) The disposable diaper 10 may be folded in a state before use such that skin sides of the disposable diaper face each other, starting from a crease extending in the width direction. The fold FL of the disposable diaper of the present embodiment is located at the center 10LC in the front-rear direction of the disposable diaper. The fold FL of the disposable diaper may be a fold line for folding the disposable diaper into two or a fold line for folding the disposable diaper into three or more. The fold line for folding the disposable diaper into three or more folds may be any fold line for folding the disposable diaper so that the non-skin side is outside.

The disposable diaper 10 may have a pair of crotch elastic portions 41 provided in a region overlapping the absorbent core 31 in the crotch region. 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 extend in the front-rear direction L and are arranged at intervals in the width direction W. 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 of 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 expansion / contraction portion 41 may straddle the center 10LC of the disposable diaper in the front-rear direction. Due to the contraction of the inseam expansion / contraction portion 41, the center 10LC in the front-back direction of the disposable diaper can be pulled up toward the body. In particular, if the disposable diaper is folded in two so that the skin side faces each other before use, the folding habit due to folding can be raised. In other forms, the crotch elastic portion 41 does not straddle the center 10LC in the front-rear direction of the disposable diaper, and may be arranged only on the front side of the center 10LC or only on the rear side of the center 10LC. May be arranged. The inseam elastic portion 41 may straddle the center 10LC in the width direction of the disposable diaper, or may be disposed on both sides of the center 10LC in the width direction of the disposable diaper. The inseam expansion / contraction portions 41 are arranged on both sides of the center in the width direction of the central high rigidity portion 71 described later. Note that the crotch elastic portion 41 may be disposed at least on both sides of the center of the central high rigidity portion 71 in the width direction, and may be disposed in a region overlapping the central high rigidity portion 71. Like the crotch elastic portion 41 C according to Modification Example 3 described below, the central high rigidity portion 71 may be continuous in the width direction W so as to straddle both sides of the center in the width direction.

The crotch elastic portion 41 may be 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 may have a low basis weight portion 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 may 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 where 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 the 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 in a region between the pair of low basis weight portions 33. The front edge 71F of the central high rigidity portion 71 may be coincident with the front edge 33F of the low basis weight portion 33 or may be located behind the front edge 33F 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 33R 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 extends forward from the crotch elastic portion 41 and constitutes the “high rigidity portion” of the present invention.

The crotch elastic 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. The first region R41 in which the crotch elastic portion 41 is arranged on the rear side of the central high rigidity portion 71 and the first region R41 in which the central high rigidity portion 71 and the crotch elastic portion 41 overlap in the thickness direction or the width direction. A second region R 42 and a third region R 43 in which the central high-rigidity portion 71 is arranged on the front side of the crotch elastic portion 41 may be provided. The first region R41 and the second region R42 are adjacent in the front-rear direction L, and the second region R42 and the third region R43 are adjacent in the front-rear direction L. The rear edge of the first region R41 coincides with the rear edge 41R of the crotch elastic portion 41, and the front edge of the first region R41 coincides with the rear edge 71R of the central high rigidity portion 71. The rear edge of the second region R42 matches the front edge of the first region R41, and the front edge of the second region R42 matches the front edge 41F of the crotch elastic portion 41. The rear edge of the third region R43 matches the front edge of the second region R42, and the front edge of the third region R43 matches the front edge 71F of the central high rigidity portion 71.

The central high rigidity portion 71 may be arranged without straddling the fold. 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 central high rigidity portion 71 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 high-rigidity part 70 may be a compressed part in which at least the absorbent core 31 is compressed. The high-rigidity portion 70 is not contracted by the inseam extension / contraction portion 41, and is easily arranged in a planar shape along the crotch. Therefore, it is easy to arrange at least the absorbent core 31 in the region where the compressed portion is provided along the crotch. Body fluid can be absorbed by the squeezed portion arranged along the crotch, and leakage of the body fluid can be suppressed while the absorbent core 31 is compactly stored in the space sandwiched between the legs.

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) Wearing state of disposable diaper Next, the wearing state of the disposable diaper 10 will be described based on FIGS. 5 and 6. FIG. 5 is a diagram schematically showing a wearing state of the disposable diaper in a section AA. FIG. 6 is a diagram for explaining a deformation mode of the central high-rigidity portion at the time of mounting. FIG. 6 is a diagram for explaining a deformation mode of the absorbent core 31 due to the contraction of the crotch elastic portion 41. In FIG. 6, the configuration other than the central high rigidity portion 71 and the crotch elastic portion 41 of the absorbent core 31 is as follows. It is abbreviated. Drawing 7 is a figure showing typically the wearing state of the disposable diaper concerning an embodiment, and it was a figure which looked at the wearer of the sleeping state from the front side. The line BL shown in FIGS. 5 and 6 indicates a line of the body of the wearer.

When the tape-type disposable diaper 10 is worn, the buttocks are placed on the rear waist area S2, the diaper is pulled toward the crotch area S3, and the body is covered with the crotch area S3. At this time, when the disposable diaper 10 is pulled in the front-rear direction L, the crotch elastic portion 41 extends in the front-rear direction as shown in FIG. When the crotch region S3 is extended against the wearer's crotch in a state where the crotch elastic portion 41 is extended, the crotch elastic portion 41 is arranged by contraction of the crotch elastic portion 41 as shown in FIG. The area is raised with respect to the body. At this time, in the deformation from the first region R41 to the third region, the first region R41 is pulled up to the body side most, and with the raising of the first region R41, the second region R42 and the third region R43 are also pulled up to the body side. Can be At this time, if the deformation of the central high-rigidity portion 71 is replaced with the “lever principle”, the front edge of the third region R43 becomes a fulcrum. Since the contraction of the inseam extension / contraction portion 41 acts on the entire second region, the point of action is the center of the central high-rigidity portion 71 in the front-rear direction (the front-rear direction of the region combining the second region R42 and the third region R43). Center). Since the point of emphasis is the region where the crotch elastic portion 41 is arranged, it becomes the center of the second region R42 in the front-rear direction. Acting as a second kind of lever, the contraction of the crotch elastic portion 41 causes the absorbent core to be pulled up toward the body with the front edge of the third region R43 as a base point.

ため Further, since the crotch elastic portion 41 is disposed on both sides of the center in the width direction of the central high rigidity portion 71, the central high rigidity portion 71 is pulled up toward the body in a certain region in the width direction. Specifically, the central high rigidity portion 71 arranged in the region (the second region R42 of the present embodiment) sandwiched in the width direction by the crotch elastic portion 41 is directly affected by the contraction of the crotch elastic portion 41, Raised to the body side. Further, in the third region R43, the central high-rigidity portion 71 does not directly act on the contraction force of the crotch elastic portion 41, and is easily arranged in a planar shape along the crotch. In the crotch region, the absorbent core 31 in the crotch region is arranged along the body by deforming into a convex shape protruding toward the body side over a certain region of the central high rigidity portion 71. At the time of wearing, the absorbent core 31 can be properly stored in the crotch of the wearer. The disposable diaper can be placed at an appropriate position between the wearer's crotches, and the front waist region can be pulled to a position covering the abdomen of the wearer. Therefore, in the tape-type disposable diaper, the wearer's body can be appropriately covered.

The length of the first region R41 in the front-rear direction may be longer than the length of the second region R42 in the front-rear direction. The first region R41 is easier to pull the absorbent core 31 toward the body by the contraction force of the crotch elastic portion 41 than the second region R42. By securing the length of the first region R41 in the front-rear direction, the first region R41 can be raised toward the body and the second region R42 can be raised together with the first region R41. Further, by increasing the length of the first region R41 in the front-rear direction, the distance between the point of action and the point of force is increased, and the central high rigidity portion 71 can be easily pulled up even with a small contraction force of the crotch elastic portion 41. Further, by increasing the length of the first region R41 in the front-rear direction and shortening the length of the second region R42, the distance between the fulcrum and the fulcrum is increased, and the center is also reduced by the contraction force of the inseam elastic portion 41. The high rigidity portion 71 can be easily pulled up.

の長 The length of the third region R43 in the front-rear direction L may be longer than the length of the second region R42 in the front-rear direction L. The length of the third region R43 in the front-rear direction is ensured, the region arranged in a plane with respect to the body is ensured, and the fit to the crotch can be improved. In addition, by securing the length of the third region in the front-rear direction, a region that is pulled up toward the body is formed up to the abdomen, and a convex shape with respect to the body is maintained up to the abdomen, so that the fit is improved. Can be 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. The fold FL is disposed in the second region R42 or the third region R43. Since the fold FL is not provided in the first region R41, it is possible to prevent a region in front of the fold FL from being pulled toward the fold FL (a side away from the body) due to contraction of the crotch elastic portion 41. Therefore, the crotch region can be made to follow the body, and the absorbent core 31 can be properly accommodated in the crotch of the wearer during wearing. 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.

折り The fold FL of the present embodiment is provided in the second region R42. The fold FL may be provided in the second region R42 behind the center of the second region R42 in the front-rear direction. The fold line FL is located behind the center in the front-rear direction of the second region R42, is provided at a position away from the front edge of the third region R43, which is a fulcrum of deformation of the absorbent core 31, and close to the action point. I have. Therefore, the deformation due to the folding habit can be more easily pulled up by the contraction of the crotch elastic portion 41. In a modification, the fold FL may be provided in the third region R43. Since the crotch elastic portion 41 is not disposed across the fold FL, it is possible to prevent a region in front of the fold FL from being pulled toward the fold FL (a side away from the body) due to the contraction of the crotch elastic portion 41. Therefore, the crotch region can be made to follow the body, and the absorbent core 31 can be properly accommodated in the crotch of the wearer during wearing.

の後 The rear end edge of the crotch elastic portion 41 may be disposed on the front side with respect to the middle line ML1 located in the middle in the front-rear direction L of the center 10LC of the disposable diaper in the front-rear direction L and the front end edge of the engaging portion 93. As shown in FIG. 1, the intermediate line ML 1 is a line extending through the center in the front-rear direction L of the center 10 LC in the front-rear direction L of the disposable diaper and the front end edge of the engaging portion 93 and extending in the width direction W. The area behind the middle line ML1 is generally an area where the buttocks are to be placed when worn. The rear end edge of the inseam extension / contraction portion 41 is located on the front side of the middle line ML1, and is arranged in a region where the buttocks of the wearer cannot be placed. At the time of mounting, in a state where the area behind the middle line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled to the front side, and the crotch elastic portion 41 is easily extended. Therefore, the region where the crotch elastic portion 41 is arranged is pulled up with respect to the body, so that the absorbent core 31 can be properly accommodated in the wearer's crotch. Further, in the modified example, the rear end edge 41R of the crotch elastic portion 41 may be located on the rear side of the intermediate line ML1. At the time of wearing, the front edge 41F side of the crotch elastic portion 41 is pulled to the front side while the rear end edge 41R of the crotch elastic portion 41 is pressed by the buttocks, and the crotch elastic portion 41 is easily extended. Therefore, the region where the inseam extension / contraction portion 41 is arranged can be raised with respect to the body, and the absorbent core can be properly accommodated in the wearer's crotch.

少なくとも At least a portion of the central high rigidity portion 71 may be arranged in a region sandwiched between the pair of low basis weight portions 33. In the present embodiment, the entire region of the central high rigidity portion 71 is arranged in a region sandwiched between the pair of low basis weight portions 33. The absorbent core 31 in the crotch region is deformed based on the low basis weight portion 33 extending in the front-rear direction when worn, and the low basis weight portion 33 is easily deformed in a convex shape 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. Therefore, it is easier to appropriately store the absorbent core 31 in the crotch of the wearer.

The rear end edge 33R of the low basis weight portion 33 is disposed at the same position as the rear end edge 41R of the crotch elastic portion 41 in the front-rear direction L, or is behind the rear end edge 41R of the crotch elastic portion 41 in the front-rear direction L. May be arranged. A region deformed from the low basis weight portion 33 as a base point can be pulled up by the crotch elastic portion 41. In addition, the region where the low basis weight portion 33 is provided has a lower rigidity than the region where the low basis weight portion 33 is not provided, and the contraction force of the crotch elastic portion 41 is more easily developed. Therefore, the absorbent core 31 is more easily pulled up toward the body side by the crotch elastic portion 41.

The crotch elastic portion 41 may be arranged in a region overlapping the low basis weight portion 33 in the thickness direction or a region overlapping the low basis weight portion 33 in the width direction. A region deformed from the low basis weight portion 33 as a base point can be pulled up by the crotch elastic portion 41. In addition, the region where the low basis weight portion 33 is provided has a lower rigidity than the region where the low basis weight portion 33 is not provided, and the contraction force of the crotch elastic portion 41 is more easily developed. Therefore, the absorbent core 31 is more easily pulled up toward the body side by the crotch elastic portion 41.

The length of the central high rigidity portion 71 in the width direction W may be shorter than the distance in the width direction between the pair of low basis weight portions 33. That is, the central high rigidity portion 71 and the low basis weight portion 33 may be separated in the width direction. The central high-rigidity portion 71 and the low-basis-weight portion 33 are separated from each other, and are more easily deformed in the separated region than the central high-rigidity portion 71 is. When the region between the low basis weight portions 33 does not fit in the crotch, the separated region is deformed. The deformed state based on the low basis weight part 33 and the central high rigidity part 71 are easily maintained along the body, and the fit to the body can be improved. In addition, since the low basis weight portion 33 and the central high rigidity portion 71 are not connected, a rigidity difference occurs between the inner edge of the low basis weight portion 33 and the outer edge 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 31 is more easily fitted to the body.

(5) Modified Example Next, an absorbent core according to a modified example will be described. FIG. 8 is a diagram schematically illustrating a plane of an absorption core according to a modification. In the following modified examples and a second embodiment described below, only the configuration different from the above-described embodiment will be described, and the description of the same configuration as the embodiment will be omitted using the same reference numerals. FIG. 8A shows an absorbent core 31A according to the first modification. The crotch elastic portion 41A of the absorbent core 31A according to Modification 1 overlaps the central high rigidity portion 71A in the thickness direction. The central high rigidity portion 71A of the absorbent core 31A according to Modification 1 extends outward in the width direction from the outer edge of the crotch elastic portion 41A. The absorbent core 31A according to Modification 1 is pulled up toward the body by contraction of the crotch elastic portion 41A in a region overlapping with the crotch elastic portion 41A and in a region sandwiched by the crotch elastic portions 41A in the width direction. The absorbent core 31A according to the first modification does not have the low basis weight portion 33. The absorbent core 31 is pulled up with respect to the wearer's crotch by the contraction of the crotch elastic portion 41, and fits with the crotch.

FIG. 8B shows an absorbent core 31B according to the second modification. The crotch elastic portion 41B of the absorbent core 31B according to Modification 2 is formed of an elastic sheet, and straddles the outer edge of the central high rigidity portion 71A in the width direction. The crotch elastic portion 41B is provided in a region overlapping the central high rigidity portion 71B and in a region located outside the central high rigidity portion 71A in the width direction. The absorbent core 31B according to Modification 2 is pulled up toward the body by contraction of the crotch elastic portion 41B in a region overlapping with the crotch elastic portion 41B and in a region sandwiched by the crotch elastic portions 41B in the width direction.

FIG. 8C shows an absorbent core 31C according to the third modification. The crotch elastic portion 41C of the absorbent core 31C according to Modification 3 is formed of an elastic sheet, and overlaps the center of the central high-rigidity portion 71C in the width direction. The central high rigidity portion 71C extends outward in the width direction from the crotch elastic portion 41C. The absorbent core 31C according to Modification 3 is pulled up toward the body by contraction of the crotch elastic portion 41C in a region overlapping with the crotch elastic portion 41B.

FIG. 8D shows an absorbent core 31D according to Modification 4. The low-basis-weight portion 33A of the absorbent core 31D according to Modification 4 has a length in the width direction changed. More specifically, the outer edge of the low basis weight portion 33A has a linear shape along the front-rear direction, and the inner edge of the low basis weight portion 33A has a straight portion 33X along the front-rear direction and a protrusion bulging inward in the width direction. A portion 33Y. According to such a low basis weight portion 33A, the rigidity changes at the boundary between the linear portion 33X and the protruding portion 33Y and at the center of the protruding portion 33Y in the front-rear direction (apex of the protruding portion), and the deformation of the absorbent core is changed. A base point is formed. Therefore, the absorbent core 31D easily follows the roundness of the body in the front-back direction.

測定 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 this 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) Second Embodiment Next, a disposable diaper according to a second embodiment will be described. The disposable diaper according to the second embodiment may be a tape-type disposable diaper or a pants-type disposable diaper. FIG. 9 is a plan view of the absorbent core 31X according to the second embodiment as viewed from the skin surface side. The central high rigidity portion 71 is provided in a region between the pair of low basis weight portions 33. The front edge 71F of the central high rigidity portion 71 may be coincident with the front edge 33F of the low basis weight portion 33 or may be located behind the front edge 33F 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 33R 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. 9, assuming that 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 is satisfied.

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 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.

Next, the wearing state of the disposable diaper 10 will be described based on FIGS. 5 and 6 of the first embodiment. When the disposable diaper is worn, the absorbent core 31X 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 31X of the crotch region S3 is easily deformed based on the low basis weight portion 33 extending in the front-rear direction L when worn, and the low basis weight portion 33 is protruded toward the body side. 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. 6, the absorbent core 31X 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 31X 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 31X along the crotch of the body.

(4) The central high-rigidity portion 71 may straddle the fold line FL that is folded so that the skin 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 portion 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 crotch 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 first region R1 extending in the width direction W from the inseam extension / contraction portion 41, there is an overlapping region R2 in which the central high rigidity portion 71 is arranged, and the length of the overlapping region R2 in the front-rear direction L is the central high rigidity portion 71. May be 以下 or less of the length L71 in the front-rear direction. 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.

If the distance between the low basis weight portion 33 and the outer edge 31E of the absorbent core 31X is D, and the length between the outer edges 31E of the absorbent core 31X is E, D> E / 4 may be satisfied. Here, the outer edge 31E of the absorbent core 31X 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 31X, 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 R may coincide with the rear end edge 33 R of the low basis weight portion 33 or may be located on the front side of the rear end edge 33 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.

中心 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.

脚 The leg elastics 42 may be disposed on an extension extending outward from the inseam elastics 41 in the width direction W. When the absorbent core 31X 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 inseam expansion / contraction portion 41, the absorbent core 31X is more easily pulled up toward the wearer.

The leg 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. The absorbent core 31X can be deformed so that the length in the width direction W of the absorbent core 31X decreases toward the crotch region with the buttocks covered in a wide range toward the rear side. While appropriately absorbing the absorbent core 31X between the wearer's crotches, the disposable diaper can cover the entire body and suppress leakage.

Although the present invention has been described in detail with reference to the above embodiments, it is apparent 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.

が Although the above-described embodiment is a tape-type disposable diaper, in a modified example, a pants-type disposable diaper may be used. When wearing the pants-type disposable diaper, both legs of the wearer are passed through the leg opening, and at least one of the waist region and the rear waist region is pulled up. At this time, when the wearer is in a sleeping position, the front waist region is pulled up while the rear waist region is in close contact with the body, and the crotch region is pulled in the front-rear direction. When the crotch region is pulled in the front-rear direction, the crotch elastic portion extends in the front-rear direction, and the region where the crotch elastic portion is arranged is pulled up with respect to the body. At this time, the first region is raised to the body side most, and the second region is also raised to the body side with the raising of the first region. Further, since the crotch elastic portion is disposed on both sides of the center of the high rigid portion in the width direction, the high rigid portion is pulled up toward the body in a region sandwiched by the crotch elastic portion. At this time, in the third region, the high-rigidity portion is not contracted by the crotch elastic portion, and is easily arranged along the crotch in a planar shape. In the crotch region, the absorbent core in the crotch region is arranged along the body by deforming into a convex shape protruding toward the body side over a certain region of the high rigidity portion. At the time of wearing, the absorbent core can be properly stored in the crotch of the wearer. The disposable diaper can be placed at an appropriate position between the wearer's crotches, and the front waist region can be pulled to a position covering the abdomen of the wearer. Therefore, in the pants-type disposable diaper, the body of the wearer can be appropriately covered.

The entire contents of Japanese Patent Application No. 2018-152784 and Japanese Patent Application No. 2018-152780 filed on August 14, 2018 are incorporated herein by reference.

According to the present invention, it is possible to provide a disposable diaper in which the absorbent core is deformed along the crotch of the body and can appropriately cover the wearer's body.

10 disposable diaper, 10LC center of diaper in the front-back direction, 31, 31X absorbent core, 33 low basis weight part, 41 inseam elastic part, 42 leg elastic part, 71 central high rigidity part (high rigidity part), 72 rear high rigidity Part (high rigidity part), 73 、 front high rigidity part (high rigidity part), 91 fastening tape, 93 engagement part, R41 first area, R42 second area, R43 third area, S1 front waist area, S2 rear waist area Area, S3 inseam area, T thickness direction, T1 skin side, T2 non-skin side, L front-back direction, W width direction

Claims

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,
Fastening tape arranged in the rear waist area,
A crotch elastic portion that expands and contracts in the front-rear direction in a region overlapping the absorbent core in the crotch region,
The disposable diaper having a higher rigidity than a surrounding region in the crotch region and a high rigidity portion extending forward from the crotch elastic portion,
The crotch elastic portion extends rearward from the high-rigidity portion on both sides of the center of the high-rigidity portion in the width direction,
The absorbent core,
A first region in which the crotch elastic portion is arranged on the rear side of the high-rigidity portion;
A second region in which the high-rigidity portion and the crotch elastic portion overlap in the thickness direction or the width direction,
And a third region in which the high-rigidity portion is disposed on a front side of the crotch elastic portion.
The fastening tape has an engaging portion that engages with the front waist area,
The rear end edge of the crotch elastic portion is disposed on the front side of a middle line in the front-rear direction between the center in the front-rear direction of the disposable diaper and the front end edge of the engaging portion, according to claim 1. Disposable diapers.
The fastening tape has an engaging portion that engages with the front waist area,
The rear end edge of the crotch elastic portion is disposed rearward of an intermediate line in the front-rear direction between the center in the front-rear direction of the disposable diaper and the front end edge of the engaging portion. Item 2. The disposable diaper according to Item 2.
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 crotch elastic portion that expands and contracts in the front-rear direction in a region overlapping the absorbent core in the crotch region,
A pants-type disposable diaper having a higher rigidity than a surrounding region in the crotch region and a high-rigidity portion extending forward from the crotch elastic portion,
The crotch elastic portion extends rearward from the high-rigidity portion on both sides of the center of the high-rigidity portion in the width direction,
The absorbent core,
A first region in which the crotch elastic portion is arranged on the rear side of the high rigidity portion,
A second region in which the high-rigidity portion and the crotch elastic portion overlap in the thickness direction or the width direction,
And a third region in which the high-rigidity portion is disposed on a front side of the crotch elastic portion.
The disposable diaper according to any one of claims 1 to 4, wherein the length of the first region in the front-rear direction is longer than the length of the second region in the front-rear direction.
The disposable diaper according to any one of claims 1 to 5, wherein the length of the third region in the front-rear direction is longer than the length of the second region in the front-rear direction.
The disposable diaper is folded such that the skin surface sides of the disposable diaper face each other based on the crease extending in the width direction,
The disposable diaper according to any one of claims 1 to 6, wherein the high-rigidity portion straddles the fold.
。 The disposable diaper according to claim 7, wherein the fold is provided in the third region.
The disposable diaper according to claim 7, wherein the fold is provided in the second region behind the center of the second region in the front-rear direction.
The absorbent core of the crotch region is provided with a pair of low basis weight portions extending in the front-rear direction and arranged at intervals in the width direction,
The disposable diaper according to any one of claims 1 to 9, wherein at least a part of the high rigidity portion is disposed in a region sandwiched by the pair of low basis weight portions.
The rear edge of the low-basis weight portion is disposed at the same position as the rear edge of the crotch elastic portion in the front-rear direction, or is disposed behind the rear edge of the crotch elastic portion in the front-rear direction. The disposable diaper according to claim 10, wherein
The disposable diaper according to claim 10 or 11, wherein the crotch elastic portion is arranged in a region overlapping the low basis weight portion in the thickness direction or the width direction.
The disposable diaper according to any one of claims 10 to 12, wherein the length in the width direction of the high-rigidity portion is shorter than the distance in the width direction between the pair of low-basis weight portions.
The disposable diaper according to any one of claims 1 to 13, wherein the high-rigidity portion is a compressed portion in which at least the absorbent core is compressed.
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,
And at least an absorbent core arranged in the crotch region,
The absorbent core of the crotch region extends in the front-rear direction, and is disposed between the pair of low-basis weight portions and spaced apart in the width direction, and a region between the pair of low-basis weight portions is smaller than a surrounding region. A disposable diaper provided with a high rigidity and a high rigidity portion,
When the length in the width direction of the high-rigidity portion is A, and the distance between the high-rigidity portion and the low-basis weight portion is B,
A + B × 2> A is satisfied,
A disposable diaper that satisfies the condition B × 2 <the condition A.
The disposable diaper is folded such that the skin surface sides of the disposable diaper face each other based on the crease extending in the width direction,
The disposable diaper according to claim 15, wherein the high-rigidity portion straddles the fold.
In the crotch region, having a pair of crotch expansion and contraction portions that expand and contract in the front-back direction,
The disposable diaper according to claim 15 or 16, wherein the crotch elastic portion is disposed on both outer sides in the width direction with respect to the high rigidity portion.
The disposable diaper according to claim 17, wherein at least a part of the crotch elastic portion is arranged in a region overlapping with the low basis weight portion.
In the region extending in the width direction from the crotch elastic portion, the high rigidity portion has an overlapping region arranged,
The disposable diaper according to claim 17 or 18, wherein the length of the overlapping region in the front-rear direction is not more than 1/2 of the length of the high-rigidity portion in the front-rear direction.
The distance between the low basis weight portion and the outer edge of the absorbent core is D,
When the length between the outer edges of the absorbent core is E,
The disposable diaper according to any one of claims 15 to 19, wherein the D> E / 4 is satisfied.
The distance between the first low basis weight portion and the high rigidity portion, which is one of the pair of low basis weight portions, is B1, and the second low basis weight portion, which is the other of the pair of low basis weight portions, and Assuming that the distance from the high-rigidity part is B2,
The disposable diaper according to any one of claims 15 to 20, wherein B1 Ｂ B2 is satisfied.
The disposable diaper according to any one of claims 15 to 21, wherein the high-rigidity portion is disposed only in a region sandwiched by the low-basis-weight portions.