TW202019363A - Disposable diaper - Google Patents

Abstract

To provide a disposable diaper that ensures a good fit to the groin of a body and to the buttocks and that makes it possible to suppress leakage. This disposable diaper (10) is provided with an absorbent core (31) arranged at least in the crotch region and a pair of crotch elastic sections (41) arranged on both outer sides of the center of the absorbent core in the width direction and extending in the front-back direction. The absorbent core comprises a narrow section (35) in which the length in the width direction is shorter than said length in the front section and the rear section of said absorbent core. At least part of each of the crotch elastic sections is arranged further inward in the width direction than the outer edges of the absorbent core in the narrow section. The rear edges (41R) of the crotch elastic sections (41) are arranged further forward than the rear edge (35R) of the narrow section (35).

Description

Disposable diapers

The present invention relates to a disposable diaper having a pair of undersea expansion and contraction portions extending in the front-rear direction in the undersea area.

Disposable disposable diapers having a pair of undersea expansion and contraction portions extending in the front-rear direction in the undersea area are known (for example, refer to Patent Document 1). The crotch expansion and contraction portion is arranged in a region overlapping the absorbent core. The contraction of the lower crotch part pulls the absorbent core of the lower crotch domain toward the body side.

In addition, the absorbent core of Patent Document 1 is formed with a pair of groove-shaped portions extending in the front-rear direction. The groove-shaped portion becomes the deformation base of the absorbent core. In the disposable diaper thus constructed, the absorbent core is deformed with the groove-shaped portion as the base point, and at the same time, the absorbent core overlapping the crotch expansion portion is pulled toward the body side. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 2018-473

However, the above-mentioned disposable diaper has the following problems. Disposable paper diapers are worn by covering the abdomen from the wearer's buttocks. The shape of the body wearing disposable disposable diapers is the narrowest in the crotch, and bulges outward from the crotch toward the buttocks toward the wide side. In the disposable paper diaper of Patent Document 1, the absorbent core pulled up by the contraction of the crotch expansion part is pulled up between the wearer's crotch. However, since the inferior crotch expansion part extends in parallel in the front-rear direction from the crotch toward the buttocks, the absorbent core is also pulled up for the buttocks as in the crotch. Therefore, if the deformation of the absorbent core applied between the crotch of the wearer continues to the back waist area, there is a possibility that the disposable diaper cannot be applied to the buttocks and leakage may occur.

Therefore, it is desirable to have a disposable diaper that can ensure the fit between the crotch of the body and the fit of the buttocks while suppressing leakage.

An aspect of the disposable disposable diaper includes: a front-rear direction and a broad-side direction orthogonal to each other; a front waist region, a back waist region, and a portion disposed between the front waist region and the back waist region A crotch region; an absorbent core arranged at least in the rear crotch region; and a pair of crotch expansion portions arranged on both outer sides of the center of the absorbent core in the widthwise direction and extending in the front-rear direction, the absorption The core has a narrow portion having a length in the widthwise direction shorter than that of the front portion and the rear portion. This disposable disposable diaper, wherein at least a part of the crotch expansion and contraction portion is arranged in the narrow portion at a position higher than that of the absorbent core The outer edge is further to the inner side in the widthwise direction, and the rear end edge of the crotch expansion and contraction portion is disposed more forward than the rear end edge of the narrow portion.

[Form for carrying out the invention] (1) Overview of the embodiment

Based on the description in this specification and the attached drawings, at least the following matters will be understood. An aspect of the disposable disposable diaper includes: a front-rear direction and a broad-side direction orthogonal to each other; a front waist region, a back waist region, and a portion disposed between the front waist region and the back waist region A crotch region; an absorbent core arranged at least in the rear crotch region; and a pair of crotch expansion portions arranged on both outer sides of the center of the absorbent core in the widthwise direction and extending in the front-rear direction, the absorption The core has a narrow portion whose length in the widthwise direction is shorter than that of the front portion and the rear portion. This disposable disposable diaper, wherein at least a part of the crotch elastic portion is arranged in the narrow portion more than the absorbent core. The outer edge is further to the inner side in the widthwise direction, and the rear end edge of the crotch expansion and contraction portion is disposed more forward than the rear end edge of the narrow portion.

According to this aspect, the absorbent core in the crotch region is retracted by the contraction part of the crotch and pulled up toward the body side. A pair of crotch expansion and contraction parts are on both outer sides of the center in the widthwise direction, and the part overlapping with the crotch expansion and contraction part is pulled up by the contraction of the crotch expansion and contraction part, and the area sandwiched by the crotch expansion and contraction part is maintained Following the flat shape of the body, it was pulled up again. The pair of crotch expansion and contraction parts are located on the inner side in the widthwise direction from the outer edge of the absorbent core, and the area between the pair of crotch expansion and contraction parts is an area on the outer side in the widthwise direction relative to the crotch expansion and contraction parts. Pulled toward the body. Therefore, the fit between the crotch of the body can be ensured. In addition, if the region between the pair of crotch expansion and contraction portions is pulled toward the body side, the narrow portion and the crotch expansion and contraction portion are overlapped in the widthwise direction, and the narrowed portion is pulled inward in the widthwise direction to form a connection. A broken line between the rear end edge of the crotch expansion part and the rear end edge of the narrow part. The deformation caused by the pair of hip extensions is guided to the side edges of the absorbent core along these fold lines, and the deformation caused by the hip extensions can be suppressed from being transmitted to the back waistline. Ensure the fit of the buttocks, can inhibit the back leakage. In addition, by forming a fold line connecting the rear end edge of the crotch telescopic portion and the rear end edge of the narrow portion, deformation such that the distance of the fold line becomes shorter is suppressed, and the rear end edge of the narrow portion resists the wide side The force to move inside in the direction. Therefore, the rear end edge of the narrow portion is less likely to move inward in the widthwise direction, and the width of the absorbent core in the back waist region can be ensured. Therefore, the absorbent core can cover the buttocks with a wide area, and leakage can be suppressed.

According to an ideal aspect, the front end edge of the crotch expansion and contraction portion may be disposed more rearward than the front end edge of the narrow portion. According to this aspect, if the region between the pair of hip extension and contraction portions deforms to be convex, a fold line connecting the front end edge of the hip extension and contraction portion is also formed. The deformation caused by the expansion and contraction of the hips can be suppressed from being transmitted to the front waist area. Ensure the fit to the abdomen, can inhibit the anterior leakage. In addition, the fold line connecting the front edge of the crotch expansion and contraction portion and the front edge of the narrow portion counteracts the force of the front edge of the narrow portion moving inward in the widthwise direction to ensure the width of the absorbent core in the front waistline. Therefore, the absorbent core can cover the abdomen in a wide area, and leakage can be suppressed.

According to an ideal aspect, the distance between the crotch expansion and contraction portion and the outer edge of the absorbent core may be at least 1/4 of the length between the outer edges of the absorbent core. According to this aspect, if the deformation is convex toward the body side with the under-hip expansion and contraction portion as a base point, the region outside the crotch expansion-contraction portion in the widthwise direction becomes a region supporting the convex deformation. Since the region outside the crotch expansion and contraction portion in the widthwise direction is 1/4 or more of the entire widthwise direction of the absorbent core, the convex deformation is stably supported, and the convex shape is easily maintained. In addition, the rigidity of the outer region in the widthwise direction is higher than that of the crotch expansion and contraction portion, so that the narrow portion of the absorbent core does not deform excessively into a convex shape, and the area of the body covered by the absorbent core can be ensured. The absorbent core covers the body with a wide area, thereby suppressing leakage.

According to an ideal aspect, there is a pair of side sheets arranged on the skin surface side of the absorbent core and covering the outer side of the absorbent core. The side sheets constitute a pair of leak-proof frills, which It has a contraction portion that rises by contraction of the leak-proof elastic member, and a base point portion that is an erection fulcrum of the contraction portion on the outer side of the contraction portion in the widthwise direction, the vertex of the contraction portion and the base point portion The distance in the widthwise direction is longer than the distance between the outer edge of the absorbent core in the narrow portion and the widthwise direction in the crotch expansion and contraction portion. According to this aspect, the leak-proof frill rises toward the wearer's side with the contraction as the apex by the contraction of the leak-proof elastic member. The maximum height of the leak-proof frill when standing is the distance between the apex of the constricted portion and the widthwise direction of the base point portion. In addition, the maximum height of the convex deformation in the region where the narrow portion is provided becomes the distance between the outer edge of the narrow portion of the absorbent core and the crotch expansion and contraction portion. Because the distance between the apex of the constricted part and the base point is longer than the distance between the outer edge of the narrow part of the absorbent core and the under-hip expansion and contraction part, the height of the leak-proof frill becomes higher than the height of the convex deformation, and It can suppress side leakage caused by leak-proof frills.

According to an ideal aspect, the lower crotch expansion part has a first crotch expansion part arranged on one side with respect to the center of the absorbent core in the widthwise direction, and a first crotch expansion part arranged on the side with respect to the absorbent core The second undersea telescopic portion on the other side of the center in the lateral direction, the first undersea telescopic portion and the second undersea telescopic portion each have a plurality of elastic members disposed at intervals in the lateral direction It is sufficient that the distance between the elastic members of the first crotch elastic part and the distance between the elastic members of the second crotch elastic part are not more than three times the thickness of the absorbent core. According to this aspect, since the first and second crotch elastic portions each have a plurality of elastic members, the force for pulling up the absorbent core becomes stronger, and it is easier to maintain the convex shape of the absorbent core. In addition, if the distance between the elastic members is further away from the thickness of three times the thickness of the absorbent core, each elastic member independently pulls up the absorbent core, which may make it difficult for the integrated elastic members to pull up the absorbent core. Since the distance between the elastic members is less than three times the thickness of the absorbent core, the plurality of elastic members of the first crotch expansion and contraction unit pulls the absorbent core integrally, while the plurality of elastic members of the second crotch expansion and contraction unit The integration can pull up the absorbent core. Therefore, the convex shape of the absorbent core is easier to form.

According to an ideal aspect, the absorbent core in the sub-crotch region is provided with a high-rigidity portion that is more rigid than the surrounding area between the pair of under-crotch elastic portions, and the high-rigidity portion spans the absorbent core The center of the aforementioned widthwise direction. According to this aspect, by increasing the rigidity of the high-rigidity portion, it is easy to make the absorbent core follow the surface shape of the body. The area between the pair of crotch expansion and contraction parts is excessively deformed to be convex, which ensures that the body area is covered by the absorbent core. In addition, since the high-rigidity portion is provided across the center of the absorbent core in the widthwise direction, arranging the absorbent core toward the excretory opening of the body can improve the inhalation of body fluids and suppress leakage.

According to an ideal aspect, the rear waist region has at least a waist expansion and contraction portion that expands and contracts in the widthwise direction, the waist expansion and contraction portion is more rearward than the narrow portion, and is wider than the crotch expansion and contraction portion. The outer side in the lateral direction may be arranged in a region overlapping the absorbent core. According to this aspect, the rear end edge of the narrow portion is as described above, and the fold line extending from the rear end edge of the hip extension and contraction portion reaches this. The fold line resists the force of the rear end edge of the narrow portion moving inward in the lateral direction, so that the rear edge of the narrow portion is less likely to move inward in the lateral direction. The absorbent core in the region overlapping with the waist expansion and contraction portion shortens the length in the widthwise direction by contraction of the waist expansion and contraction portion. At this time, the area closer to the rear side of the narrower portion and further to the outer side in the widthwise direction than the crotch expansion and contraction portion is easily moved toward the widthwise direction by contracting the waist expansion and contraction portion with the rear end edge of the narrowed portion as the base point Deformed inside. At this time, the rear end edge of the narrow portion becomes a deformation base point, and it is not easy to move inward in the lateral direction. The trailing edge of the narrow portion located more to the rear than the hip expansion and contraction portion is less likely to move inward in the widthwise direction, and it is easier to ensure the widthwise length of the absorbent core in the back waist region, which can suppress back leakage .

According to an ideal aspect, the waist elastic part has a first region and a second region having a higher elongation in the widthwise direction than the first region, after the back of the crotch elastic part The first region described above may be arranged on the first extension line whose edge extends toward the rear side. According to this aspect, since the first region is provided on the first extension line extending from the rear end edge of the lower crotch portion toward the rear side, the region deformed in a convex shape due to the contraction of the lower crotch portion is not easily affected by The contraction of the waist expansion and contraction portion narrows toward the wide side, and it is easy to maintain the convex deformation state.

According to an ideal aspect, the second region may be arranged on a second extension line extending toward the rear side from the region outside the crotch expansion and contraction portion in the lateral direction. According to this aspect, since the second region is provided on the second extension line, the region outside the crotch expansion and contraction portion of the absorbent core in the widthwise direction is easier to move toward the widthwise direction with the rear end edge of the narrow portion as the base point Deformed inside. The trailing edge of the narrow portion located more to the rear than the hip expansion and contraction portion is less likely to move inward in the widthwise direction, and it is easier to ensure the widthwise length of the absorbent core in the back waist region, which can suppress back leakage .

According to an ideal aspect, it is provided with a hook and loop fastener which is arranged in the back waist region and has an engaging portion which is engaged with the front waist region, and is located outside the absorbent core in the widthwise direction It is sufficient that the leg circumference expansion and contraction portion is stretched on the first imaginary line connecting the front end edge of the inner edge of the engagement portion and the rear end edge of the crotch expansion and contraction portion in the front-rear direction. According to this aspect, the first imaginary line connecting the front end edge of the inner edge of the engaging portion and the rear end edge of the crotch expansion and contraction portion acts outward when pulling the hook-and-loop fastener in the lateral direction force. By the operation at the time of wearing, the rear edge of the crotch expansion and contraction portion is pulled outward in the widthwise direction, and the absorbent core deformed to the body side by the crotch expansion and contraction in the convex shape is also pulled outward in the widthwise direction. Therefore, the convex deformation of the absorbent core is suppressed from collapsing inward in the lateral direction, and the convex deformation state is easily maintained. Moreover, the leg circumference expansion-contraction part is arrange|positioned on the 1st imaginary line, and the leg circumference expansion-contraction part can be pulled up when wearing. Therefore, the fit to the excretory opening between the crotch and the fit to the leg circumference can be improved, and the leakage can be further suppressed.

According to an ideal aspect, a hook-and-loop fastener having an engaging portion disposed in the rear waist region and having an engaging portion that is engaged with the front waist region is provided on the absorbent core on the rear side of the lower crotch expansion portion There is a pair of deformation base points extending toward the rear side and outward in the widthwise direction and arranged at intervals in the widthwise direction, the deformation base point being arranged at a rear end of the lower crotch expansion part The second imaginary line between the edge and the rear end edge of the narrow portion may be closer to the inner side in the lateral direction. According to this aspect, the second imaginary line connecting the rear end edge of the crotch expansion portion and the rear end edge of the narrow portion becomes a polyline that opposes the force of the rear end edge of the narrow portion moving inward in the widthwise direction. The sandwiched area is configured to cover the body. It is formed by deforming the base point further to the rear than the lower crotch expansion part in this area. The deformation base point portion extends outward in the widthwise direction toward the rear side, and a deformation base point extending inward in the widthwise direction from the back waist region toward the crotch region is formed in the absorbent core. In order to wear a tape-type disposable paper diaper, place the buttocks in the back waist area, and when pulling the paper diaper toward the crotch area, the absorbent core moves from the back waist area toward the crotch area toward the wide side The base point extending inside is deformed. Thereby, the absorbent core can be deformed so that the length in the lateral direction becomes shorter toward the crotch region side. The absorbent core of the crotch region is deformed convexly toward the body side by the contraction of a pair of crotch expansion parts. Therefore, the absorbent core of the crotch region is arranged along the body side. Therefore, the absorbent core can be appropriately stored in the crotch of the wearer. The absorbent core is covered with a wide area relative to the wearer's buttocks, and the absorbent core can be tightly accommodated in the gap between the wearer's legs. The absorbent core fits from the wearer's buttocks to the crotch to further suppress leakage.

According to an ideal aspect, the angle in the lateral direction with respect to the second imaginary line may be smaller than the angle in the lateral direction with respect to the deformation base point portion. According to this aspect, since the angle with respect to the second imaginary line in the widthwise direction is small, the movement of the rear edge of the narrow portion toward the inside in the widthwise direction can be further suppressed, and the absorbent core in the back waistline can be further secured The width. In addition, since the angle with respect to the deformation base point in the widthwise direction is relatively large, the region sandwiched by the second imaginary line can be partially deformed by the outer side of the deformation base point in the widthwise direction. The area covers the body. Therefore, the absorbent core can cover the buttocks with a wide area, and leakage can be suppressed.

(2) Overall structure of disposable diapers Hereinafter, the disposable diaper of the embodiment will be described with reference to the drawings. In addition, in the description of the following drawings, the same or similar symbols are indicated in the same or similar parts. However, the figures are schematics, and it must be noted that the ratio of each size is different from the actual one. Therefore, specific dimensions, etc. must be judged with reference to the following description. In addition, even if the drawings are mutually different, there may be parts in which the relationship and the ratio of the dimensions are different from each other.

The disposable paper diaper may also be an adhesive tape type disposable paper diaper, or a shorts type disposable paper diaper. Fig. 1 is a plan view of the disposable paper diaper 10 of the present embodiment viewed from the skin side, and Fig. 2 is a plan view of the absorbent core of the embodiment viewed from the skin side. The plan views shown in FIGS. 1 and 2 show the disposable diaper in an extended state. 3 is a schematic cross-sectional view taken along the A-A cross section of the disposable paper diaper shown in FIG. 1. Fig. 4 is a schematic cross-sectional view taken along the line B-B of the disposable paper diaper shown in Fig. 1. 5 is a schematic cross-sectional view taken along the line C-C of the disposable diaper shown in FIG. 1. In addition, the extended state in the present invention refers to a state in which the disposable paper diaper 10 is extended to a state where no wrinkles are formed. In addition, the natural state in the present invention refers to the disposable paper diaper 10 stored in the packaging bag, and the disposable paper diaper 10 taken out of the packaging bag at 20°C±2°C and a relative humidity of 60% In a state of ±5% RH, leave it for 24 hours.

The disposable diaper 10 has a front-back direction L and a wide-side direction W orthogonal to each other. The front-back direction L is defined by the direction extending toward the front side and the back side of the body. In other words, the front-rear direction L is a direction extending forward and backward in the disposable paper diaper 10 that is unfolded. In addition, the disposable diaper 10 has a thickness direction T orthogonal to both of the front-back direction L and the widthwise direction W. The thickness direction T is the skin surface side T1 facing the wearer side and the non-skin surface side T2 opposite to the skin surface side.

The disposable diaper 10 has a front waist region S1, a back waist region S2, and a crotch region S3. The front waistline area S1 is an area facing the front waistline (abdomen) of the wearer. The back waistline area S2 is an area facing the wearer's back waistline (back), and includes the area where the body (buttocks) is placed while wearing. The crotch region S3 is located under the wearer's crotch and is a region disposed between the front waist region S1 and the back waist region S2. The crotch region S3 is a region provided with a leg circumference opening arranged at the wearer's leg circumference. The leg opening portion is recessed from the outer edge of the disposable paper diaper toward the inner side in the widthwise direction.

The disposable diaper 10 includes an absorbent core 31 containing an absorbent material. The absorbent core 31 includes absorbent materials such as crushed pulp, super absorbent polymer (SAP), or a mixture of these. As shown in FIG. 3, the absorbent core 31 may be covered by the core-cladding layer 32. The absorber 30 may be constituted by the absorbent core 31 and the core-cladding layer 32. The core cladding layer 32 is made of thin paper, and may be arranged on the skin surface side T1 of the absorbent core 31 and the non-skin surface side T2 of the absorbent core 31.

As shown in FIGS. 1 and 3, the surface sheet 21 and the side sheet 22 may be provided on the skin surface side T1 of the absorber 30 including the absorbent core 31. The surface sheet 21 may be disposed across the center of the absorber 30 in the widthwise direction W. The side sheets 22 may be arranged in a pair so as to cover the outer sides of the top sheet 21 and the absorbent core 31. The surface sheet 21 and the side sheet 22 may be composed of liquid-permeable sheets such as non-woven fabric and perforated plastic film, for example. The inner side portion of the side sheet 22 may be folded and overlapped. It is only necessary to provide a leak-proof expansion and contraction portion 43 that expands and contracts in the front-rear direction L between the overlapping side sheets 22. The leak-proof expansion and contraction portion 43 may be composed of a thread rubber that expands and contracts in the front-rear direction L. The side sheet 22 and the leak-proof stretchable portion 43 constitute a leak-proof frill 60 that rises toward the skin surface side T1 during wearing (see FIG. 6 ). As shown in FIGS. 1 and 3, the leakage-preventing frill 60 has a contraction portion 61 that is raised by the contraction of the leakage-prevention and contraction portion 43, and an outer side of the contraction portion 61 in the widthwise direction W, which becomes a contraction portion The base point 62 of the erection fulcrum. At the base portion 62, the side sheet 22 is joined to the surface sheet 21. The side sheet 22 is not joined to the surface sheet 21 on the inner side in the widthwise direction from the base point portion 62, but is configured to stand up to the surface sheet 21.

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

A hook and loop fastener 91 is provided on the outer side of the back waistline. The hook-and-loop fastener 91 has a base portion 92 and an engaging portion 93. The base portion 92 is disposed 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 widthwise direction W. The engaging portion 93 is arranged on the base portion 92 and engaged with the target portion 95 (see FIG. 5 ). The target portion 95 is arranged in the front waist region S1 at intervals in the widthwise direction, and the structured hook-and-loop fasteners 91 are respectively locked.

The indicator portion 51 may be arranged between the back sheet 23 and the absorber 30. The indicator portion 51 may be disposed on the non-skin surface side T2 of the absorbent core 31. The indicator portion 51 may extend in the front-rear direction L, and may be arranged at intervals in the lateral direction W. The instruction section 51 is arranged between the low basis weight sections 33 described later. The indicator portion 51 changes color by absorbing body fluids by the absorber 30, and is configured to be able to grasp the absorption state of body fluids from the non-skin surface side T2 of the disposable diaper 10 after use.

The disposable diaper 10 has a leg circumference expansion and contraction portion 42 that is stretchable in the front-rear direction on the outer side of the absorbent core 31 in the widthwise direction. The leg circumference expansion and contraction portion 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 circumference expansion-contraction part 42 is comprised by the band-shaped expansion-contraction sheet which expands and contracts in the front-back direction L. As shown in FIG. Due to the contraction of the leg circumference expansion and contraction portion 42, the leg circumference opening of the disposable diaper 10 after use is fitted to the leg circumference.

The disposable paper diaper 10 has at least a waist expansion and contraction portion 45 that expands and contracts in the widthwise direction in the rear waist area. The waist stretch portion 45 extends in the widthwise direction W along the rear edge of the disposable diaper. The waist stretch part 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 end edge of the waist elastic part 45 is located closer to the front side than the rear end edge of the disposable paper diaper, and the front end edge of the waist elastic part 45 is located closer to the front side than the rear end edge of the absorbent core 31 . The waist expansion and contraction portion 45 may extend outward from the absorbent core 31 in the lateral direction W. The waist expansion and contraction portion 45 is composed of a band-shaped expansion and contraction sheet that expands and contracts in the widthwise direction W.

The disposable diaper 10 only needs to have a pair of under-hip stretchers 41 provided in the region overlapping the absorbent core 31 in the under-hip region. The crotch expansion and contraction portion 41 may be disposed on the non-skin surface side of the absorbent core 31, and may be disposed on the non-skin surface side of the absorbent body 30. The crotch expansion portion 41 may be disposed between the absorbent core 31 and the back sheet 23, may be disposed between the core cladding layer 32 disposed on the non-skin surface side T2 of the absorbent core 31, and the back sheet 23, may be The core cladding layer 32 disposed on the non-skin surface side T2 of the absorbent core 31 and the absorbent core 31 may be provided between the back sheet 23 and the exterior sheet 24. The crotch expansion and contraction portion 41 of this embodiment is arranged between the back sheet 23 and the exterior sheet 24. The crotch expansion and contraction portion 41 extends in the front-rear direction L, and is arranged at intervals in the widthwise direction W. The crotch expansion and contraction portions 41 are not arranged at the center of the absorbent core 31 in the widthwise direction W, but are arranged on both sides with respect to the center of the absorbent core 31 in the widthwise direction W. Therefore, due to the contraction of the crotch expansion and contraction portion 41, the absorbent core in the region overlapping the crotch expansion and contraction portion 41 is pulled toward the body side from the center of the absorbent core in the widthwise direction. The pair of crotch expansion and contraction portions 41 need only be positioned inward in the widthwise direction from the outer edge of the absorbent core 31. The area between the pair of undersea expansion and contraction portions 41 is pulled toward the body side with respect to the area of the pair of undersea expansion and contraction portions 41 further to the outer side in the widthwise direction. Therefore, the center of the absorbent core in the widthwise direction is deformed in a convex shape with the side portion as the base point, and the fit between the crotch of the body can be ensured. The crotch expansion and contraction portion 41 has a first crotch expansion and contraction portion 411 disposed on one side with respect to the center of the absorbent core 31 in the lateral direction W, and a center disposed in the lateral direction W with respect to the absorbent core 31 The second crotch expansion and contraction portion 412 on the other side may be sufficient. The first lower crotch expansion portion 411 and the second lower crotch expansion portion 412 each have a plurality of elastic members arranged at intervals in the widthwise direction W. The crotch expansion and contraction portion 41 is made of silk rubber arranged along the front-rear direction L. Furthermore, in other forms, the crotch expansion and contraction portion 41 may be constituted by a belt-shaped expansion and contraction sheet that expands and contracts in the front-rear direction, may be constituted by one thread rubber, or may be constituted by 3 or more thread rubbers . In addition, the state of overlap in the present invention refers to a state in which one member overlaps the other member when viewed from above, and the other member is arranged on the skin surface side or the non-skin surface side of the one member. The overlapping state includes not only a state where one member and the other member are in contact with each other, but also a structure in which another member is interposed between the one member and the other member.

It is sufficient that the crotch expansion section 41 spans the center 10LC in the front-rear direction of the disposable paper diaper after use. By contraction of the crotch expansion portion 41, the center 10LC in the front-rear direction of the disposable diaper can be pulled toward the body side. In particular, in a form in which the skin side of the disposable diaper is folded in half in a facing manner before use, the folding habits due to folding can be promoted. At least a part of the crotch expansion and contraction portion 41 is located inward in the widthwise direction W from the outer edge of the absorbent core 31 in the narrow portion 35 described later. At least a part of the crotch expansion and contraction part 41 is arrange|positioned in the range of the narrow part 35 in the front-back direction. The rear end edge 41R of the hip extension and contraction portion 41 is arranged closer to the front side than the rear end edge 35R of the narrow portion 35. In addition, the front end edge 41F of the crotch expansion and contraction portion 41 may be disposed on the rear side of the front end edge 35F of the narrow portion 35. An area where the contraction force of the crotch expansion and contraction portion 41 is less likely to act is provided outside the crotch expansion and contraction portion 41 of the absorbent core 31 in the widthwise direction W. FIG. 3 shows the side region R31 where the absorbent core 31 is located on the outer side of the crotch expansion part 41 and the central region R32 between the side regions R31. The side region R31 is a region outside the crotch expansion and contraction portion 41 located most outside in the widthwise direction W. The central region R32 is a region where the region overlapping the crotch expansion and contraction portion 41 and the region located inside the crotch expansion and contraction portion 41 in the lateral direction W are combined. The central region R32 is pulled toward the body side with respect to the side region R31 by the contraction of the hip expansion and contraction portion 41. The modification of the absorbent core 31 at the time of wearing will be described in detail later.

In addition, the expansion and contraction portion including the leak-proof expansion and contraction portion 43, the leg circumference expansion and contraction portion 42, the waist circumference expansion and contraction portion 45, and the crotch expansion and contraction portion 41 in the present invention is elastically stretchable with an elastic member such as silk rubber, an elastic sheet The part where the state is arranged does not include the part where the elastic member is arranged in a state where it is not retractable. That is, the telescopic portion is an effective long portion of the elastic member constituting the telescopic portion. In addition, in other forms, the crotch expansion section 41 may not have the center 10LC in the front-rear direction of the disposable diaper after being used, and may only be arranged on the front side of the center 10LC, or may only be arranged on the side The center 10LC is further back.

(3) Structure of absorbent core Next, the structure of the absorbent core 31 will be described in detail with reference to FIG. 2. The absorbent core 31 has a narrow portion 35 whose length in the widthwise direction is shorter than the front and rear portions, a front portion located on the front side of the narrow portion 35, and a rear portion located on the back side of the narrow portion 35. The length of the widthwise direction W of the absorbent core 31 of the narrow portion 35 is shorter than the length of the widthwise direction W of the front absorbent core 31 and shorter than the length of the widthwise direction W of the rear absorbent core 31. The length of the width direction W of the front absorbent core 31 may be the same as or different from the length of the width direction W of the rear absorbent core 31. The narrow portion 35 is arranged between the front and the rear. The length of the narrow portion 35 in the lateral direction becomes longer toward the outside in the front-rear direction L. The shape of the absorbent core 31 when viewed from above is an hourglass shape. In addition, not only the absorbent core 31 but also the shape of the absorbent body wrapped with the core-clad layer may be an hourglass shape.

The absorbent core 31 only needs to have a low basis weight portion 33 having a lower basis weight than the surrounding area. The low basis weight portion 33 is provided along the front-rear direction L. The low basis weight portion 33 only needs to extend in the front-rear direction L, may be parallel to the front-rear direction L, or may be inclined at an angle 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 the surrounding absorbent core 31, the thickness is thinner than the surrounding absorbent core 31, and the rigidity is low. Therefore, the low basis weight portion 33 easily becomes a deformation base point in the wearing state. The absorbent core 31 easily forms a deformation base point that extends in the front-rear direction in the wearing state. The low basis weight portion 33 may be a portion where the basis weight of the absorbent material is substantially zero (the design basis weight is 0, but it includes a portion mixed with the surrounding absorbent material), or it may be arranged more than the surrounding A portion of absorbent material with a low basis weight. The low basis weight portion 33 may be a slit having a certain length in the widthwise direction W, or may be a slit having a length of the widthwise direction W that is substantially zero. The length of each low basis weight portion 33 in the widthwise direction W 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. By setting the length of the low basis weight portion 33 in the widthwise direction to be greater than the thickness of the absorbent core 31, and using the low basis weight portion 33 as a base point, the absorbent core 31 is easily deformed in the thickness direction. In addition, the length of the low basis weight portion 33 in the widthwise direction is set to 8 mm or less, which can suppress the front and back of the low basis weight portion 33 due to the long length of the low basis weight portion in the widthwise direction relative to the absorption performance. The length of the direction L is preferably 30 mm or more and 180 mm or less.

The low basis weight portions 33 are arranged in a pair in the widthwise direction W at intervals. The low basis weight portion 33 may be disposed on both sides of the center 10WC of the disposable paper diaper in the widthwise direction at intervals in the widthwise direction W. The center of the low basis weight portion 33 in the front-rear direction is disposed on the rear side of the center 10LC of the disposable paper diaper in the front-rear direction. The front end edge 33F of the low basis weight portion 33 may be located closer to the front side than the front end edge 41F of the lower crotch expansion portion 41, and the rear end edge 33R of the lower basis weight portion 33 is the rear end edge of the crotch expansion and contraction portion 41. The 41R may be the same or located on the front side of the rear edge 41R. The outer edge of the low basis weight portion 33 and the silk rubber constituting the outer side of the crotch expansion and contraction portion 41 may be aligned in the widthwise direction, and the inner edge of the low basis weight portion 33 and the under the expansion and contraction portion Of the 41 thread rubbers, the thread rubbers located on the inner side in the widthwise direction may be aligned in the widthwise direction.

The absorbent core 31 only needs to have a high-rigidity portion 70 having higher rigidity than the surrounding area. The high-rigidity portion 70 has a central high-rigidity portion 71 disposed between the pair of lower crotch telescopic portions 41, a rear high-rigidity portion 72 disposed on the rear side of the lower crotch telescopic portion 41, and a lower crotch portion The expansion and contraction portion 41 may be closer to the front high rigidity portion 73 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 in the front-rear direction L, respectively. The high-rigidity portion 70 is a region with higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than the surrounding area, and the absorbent core 31 may be a portion compressed in the thickness direction. The high-rigidity portion 70 of this embodiment is a portion provided with a press portion that compresses the absorbent core 31. The press portion may be formed at least by pressing the absorbent core 31 in the thickness direction T, or may be formed by pressing other members such as the press core cladding 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 end edge 71F of the central high-rigidity portion 71 may coincide with the front end edge 33F of the low basis weight portion 33 or may be located on the rear side of the front end edge 33F of the lower basis weight portion 33. The rear edge 71R of the central high-rigidity portion 71 may be located closer to the front side than the rear edge 33R of the lower base weight portion 33. The center of the central high-rigidity portion 71 in the front-rear direction may be disposed closer to the front side than the center of the lower base weight portion 33 in the front-rear direction. The central high-rigidity portion 71 may be arranged at a distance from the low basis weight portion 33 in the widthwise direction W. The central high-rigidity portion 71 may cross the center 10LC in the front-rear direction of the disposable diaper and the center 10WC in the widthwise direction W of the disposable diaper.

The crotch expansion and contraction portion 41 is located on both sides of the center of the central high rigidity portion 71 in the widthwise direction, and may extend toward the rear side of the central high rigidity portion 71. The absorbent core 31 has a first region R41 in which the crotch expansion and contraction portion 41 is arranged more rearward than the central high-rigidity portion 71, and the central high-rigidity portion 71 and the crotch expansion and contraction portion 41 overlap in the thickness direction or the lateral direction. The two regions R42 and the third region R43 in which the central high-rigidity portion 71 is arranged on the front side of the lower crotch expansion portion 41 may be sufficient. 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 end edge of the first region R41 coincides with the rear end edge 41R of the crotch telescopic portion 41, and the front end edge of the first region R41 coincides with the rear end edge 71R of the central high-rigidity portion 71. The rear end edge of the second region R42 coincides with the front end edge of the first region R41, and the front end edge of the second region R42 coincides with the front end edge 41F of the crotch telescopic portion 41. The rear end edge of the third region R43 coincides with the front end edge of the second region R42, and the front end edge of the third region R43 coincides with the front end edge 71F of the central high-rigidity portion 71.

The rear high-rigidity portion 72 may be arranged on the rear side of the lower basis weight portion 33. The outer edge of the rear high-rigidity portion 72 may extend outward in the lateral direction W toward the rear side. The length of the front edge of the rear high-rigidity portion 72 in the widthwise direction W may be longer than the length of the central high-rigidity portion 71 in the widthwise direction W. The rear high-rigidity portion 72 only needs to cross the center 10WC of the disposable paper diaper in the widthwise direction W. The front high rigidity portion 73 may be arranged closer to the front side of the lower base weight portion 33. The front high-rigidity portion 73 may be disposed on both sides of the center 10WC of the disposable paper diaper in the widthwise direction W at intervals in the widthwise direction W. The front edge of the front high-rigidity portion 73 may extend toward the front side toward the outside in the lateral direction W.

The absorbent core 31 only needs to have a pair of deformation base points 85 provided on the rear side of the lower crotch expansion part 41. The deformation base point portion 85 extends toward the rear side to the outside of the lateral direction W from the rear side to the rear side of the crotch expansion and contraction portion 41, and is arranged in a pair in the lateral direction W at intervals. The deformation base point portion 85 becomes the base point of the deformation of the absorbent core 31 in the thickness direction. The modified base point portion 85 of this embodiment is composed of the outer portion 72S of the rear high-rigidity portion 72. The deformation base point portion 85 has a base edge 85E that becomes an edge of the deformation base point. The base point edge is the edge of the fold line forming the thickness of the absorbent core 31. The base edge 85E of this embodiment is the outer edge 72E of the rear high-rigidity portion 72. The deformed base point portion 85 of the present embodiment includes a region extending from the base point edge 85E to the thickness of the absorbent core 31 toward the inner side in the lateral direction W.

Here, the outer side portion of the present invention refers to a portion that occupies a certain range in the widthwise direction W including the outside edge in the widthwise direction W, and the outside edge refers to the outside edge in the widthwise direction W. In addition, the inner side portion refers to a portion that occupies a certain range in the widthwise direction W including the inside edge in the widthwise direction W, and the inside edge refers to the inside edge in the widthwise direction W. In addition, the deformation base point portion 85 only needs to be the base point of the deformation of the absorbent core 31 in the thickness direction, and is not limited by the outer portion of the high-rigidity portion due to the press portion. Deformation base points in other aspects will be described later.

(4) Deformation when wearing disposable diapers Next, a modification of the disposable diaper 10 when worn is described with reference to FIGS. 6 to 8. Fig. 6 is a diagram schematically showing a wearing state in a section A-A of a disposable diaper. 7 is a diagram schematically showing a wearing state of the disposable diaper of the embodiment, and a view of the wearer in a sleeping state as viewed from the front side. FIG. 8 is a diagram for explaining the deformation of the absorbent core during wearing, that is, showing the plane of the absorbent core. The solid line in FIG. 9 shows the absorbent core 31 before deformation and the lower crotch expansion portion 41, and the two-dot chain line shows the absorbent core 31 after deformation and the lower crotch expansion portion 41. In FIG. 7, for convenience of description, only the absorbent core 31, the crotch elastic part 41 and the waist elastic part 45 are shown, and other members are omitted for illustration. Fig. 9 is a diagram for explaining the deformation of the absorber during wearing in the B-B section of the disposable diaper. In addition, the line BL shown in FIG. 6 represents the line of the wearer's body.

The absorbent core 31 of the crotch region S3 is pulled toward the body side by the contraction of the crotch expansion and contraction portion 41. A pair of crotch expansion parts 41 are located on both outer sides of the center of the lateral direction W, and the part overlapping with the crotch expansion part 41 is pulled up by the contraction of the crotch expansion part 41, and is located by the left and right crotch expansion parts The gripped area both maintains a flat shape along the body and is pulled up. The pair of lower crotch expansion parts 41 are located inward in the widthwise direction than the outer edge 31E of the absorbent core 31, and the central region R32 between the pair of lower crotch expansion parts 41 is moved toward the body side with respect to the side region R31 Pull up. Therefore, the center of the absorbent core in the widthwise direction is deformed in a convex shape with the side portion as the base point, and the fit between the crotch of the body can be ensured. In addition, when the central region R32 is pulled toward the body side, the narrowed portion 35 is pulled inward in the widthwise direction in the area where the narrowed portion 35 and the crotch expansion and contraction portion 41 overlap in the widthwise direction, thereby forming a connected crotch expansion and contraction The first fold line FL1 of the rear end edge 41R of the portion 41 and the rear end edge 35R of the narrow portion 35. As shown in FIG. 2, the first fold line FL1 reaches the outer edge 31E of the absorbent core 31 located on both sides of the rear end edge 41R of the crotch expansion and contraction portion 41 to the both sides in the widthwise direction. As in the present embodiment, when the crotch expansion and contraction portion 41 is composed of a plurality of elastic members, the first fold line FL1 easily connects the rear end edge of the elastic member located outside in the widthwise direction to the rear end edge 35R of the narrow portion 35 The way is formed. The deformation caused by the pair of hip extensions 41 is guided to the outer edge 31E of the absorbent core 31 along the first fold line FL1, and the deformation caused by the hip extension 41 can be suppressed from being transmitted to the back waistline The situation on the domain side. Ensure the fit of the buttocks, can inhibit the back leakage.

In addition, by forming the first fold line FL1, deformation such that the distance of the first fold line FL1 becomes shorter is suppressed, and the rear end edge 35R of the narrow portion 35 resists the force moving inward in the lateral direction. Therefore, the rear end edge 35R of the narrow portion 35 is less likely to move inward in the widthwise direction W, and the width of the absorbent core 31 in the rear waist region S2 can be secured. Therefore, the absorbent core can cover the buttocks with a wide area, and leakage can be suppressed.

The front end edge 41F of the crotch expansion and contraction portion 41 may be disposed further to the rear side than the front end edge 35F of the narrow portion 35. If the central region R32 is pulled toward the wearer side with respect to the side region R31, the absorbent core 31 is deformed in a convex shape, and the first end edge 41F connecting the front end edge 41F of the crotch expansion and contraction portion 41 and the front end edge 35F of the narrowed portion 35 is also formed. 2 fold line FL2. As shown in FIG. 2, the second fold line FL2 reaches the outer edge 31E of the absorbent core 31 located at the front edge 41F of the crotch expansion and contraction portion 41 to both sides in the widthwise direction. As in the present embodiment, when the crotch expansion and contraction portion 41 is composed of a plurality of elastic members, the second fold line FL2 is easily connected by connecting the front edge of the elastic member located outside in the widthwise direction to the front edge 35F of the narrow portion 35 form. It is possible to suppress the deformation caused by the hip expansion and contraction portion 41 from being transmitted to the front waist region S1 side. Ensure the fit to the abdomen, can inhibit the anterior leakage. In addition, the second fold line FL2 can ensure the width of the absorbent core 31 in the front waist region S1 against the force of the front edge 35F of the narrow portion 35 moving inward in the lateral direction W. Therefore, the absorbent core 31 can cover the abdomen in a wide area, and leakage can be suppressed.

The distance W11 between the crotch expansion portion 41 and the outer edge 31E of the absorbent core 31 may be 1/4 or more with respect to the length W12 between the outer edge 31E of the absorbent core 31. Here, the outer edge 31E of the absorbent core 31 refers to the outer edge in the region extending from the crotch expansion and contraction portion 41 in the lateral direction W. That is, it suffices to satisfy W11×4>W12 on any straight line that passes through the crotch expansion-contraction portion 41 and extends in the lateral direction W. If the under-crotch expansion and contraction portion 41 is deformed convexly toward the body side, the area outside the crotch-expandable portion 41 in the lateral direction W becomes a region that supports the convex deformation. Since the side region R31 outside the crotch expansion and contraction portion 41 in the widthwise direction W is 1/4 or more of the entire widthwise direction of the absorbent core 31, the convex deformation is stably supported, and the convex shape is easily maintained. In addition, the rigidity of the outer region in the widthwise direction is higher than that of the crotch expansion and contraction portion 41, so that the narrow portion 35 of the absorbent core 31 does not become excessively deformed into a convex shape, and the absorbent core 31 can securely cover the body Area. The absorbent core covers the body with a wide area, thereby suppressing leakage.

As shown in FIG. 3, in the extended state of the disposable diaper, the distance W21 between the apex of the contracted portion 61 and the base point portion 62 in the widthwise direction is larger than the outer edge of the absorbent core 31 in the narrowed portion 35 and the crotch. The distance W22 in the widthwise direction of the portion 41 may be longer. Here, the apex of the contracted portion 61 is the inner edge of the side sheet 22. In addition, the configuration in which the length of the narrow portion 35 in the widthwise direction changes is sufficient as long as it passes through the narrow portion 35 and the crotch expansion and contraction portion 41 and satisfies W21>W22 on any straight line extending in the widthwise direction W. The leak-proof frill 60 rises toward the wearer's side with the contraction portion 61 as the apex by the contraction of the leak-proof expansion and contraction portion 43. The maximum height of the rising portion of the leakage-preventing frill 60 when standing is the distance W21 between the apex of the contracted portion 61 and the base point portion 62 in the widthwise direction. In addition, the maximum height of the convex deformation in the region where the narrow portion 35 is provided becomes the distance W22 between the outer edge of the narrow portion 35 and the crotch expansion and contraction portion 41. Since the distance W21 is longer than the distance W22, the height of the leakage-preventing hem 60 becomes higher than the height of the convex deformation. Therefore, the leakage-preventing hem 60 can suppress side leakage.

The distance between the elastic members of the first crotch elastic portion 411 and the distance between the elastic members of the second crotch elastic portion 412 may be three times or less with respect to the thickness of the absorbent core. Here, the thickness of the absorbent core 31 is the maximum thickness of the absorbent core. In the present embodiment, the distance between the elastic members of the first crotch elastic portion 411 and the distance between the elastic members of the second crotch elastic portion 412 is the distance between the two thread rubbers. Since the first lower crotch expansion part 411 and the second lower crotch expansion part 412 each have a plurality of elastic members, the force for pulling up the absorbent core becomes stronger, and it is easier to maintain the convex shape of the absorbent core. When the distance between the elastic members of the first crotch elastic portion 411 and the distance between the elastic members of the second crotch elastic portion 412 are more than three times the thickness of the absorbent core, each elastic member independently pulls up the absorbent core And, there may be cases where the integration of the elastic member is difficult to pull up the absorbent core. The distance between the elastic members is 3 times or less with respect to the thickness of the absorbent core 31. While the plurality of elastic members of the first crotch telescopic portion 411 integrally pulls up the absorbent core, the plurality of elastic members of the second crotch telescopic portion 412 integrally pulls up the absorbent core. Therefore, it is easier to form the convex shape of the absorbent core 31.

In the absorption core 31 of the crotch region 3, a high-rigidity portion that is more rigid than the surrounding area may be provided between the pair of crotch expansion portions 41. The high-rigidity portion only needs to span the center of the absorbent core 31 in the widthwise direction. By increasing the rigidity of the high-rigidity portion, it is easy to make the absorbent core follow the surface shape of the body. The area between the pair of hip extensions 41 is excessively deformed to be convex, and the area of the body covered by the absorbent core 31 can be ensured. In addition, since the high-rigidity portion is provided across the center of the absorbent core 31 in the widthwise direction, arranging the absorbent core to the body's excretion port can increase the inhalation of body fluids and suppress leakage. The high-rigidity portion may be the central high-rigidity portion 71, and may be a lattice press portion (not shown) arranged in a lattice shape. The lattice press portion may be formed by compressing the absorbent core at least in the thickness direction, and not only the region between the pair of hip expansion and contraction portions 41 but also the entire area of the absorbent core.

The waist expansion and contraction portion 45 may be disposed on the rear side of the narrow portion 35 and outside the crotch expansion and contraction portion 41 in the widthwise direction W in the region R11 overlapping the absorbent core 31. The rear end edge 35R of the narrow portion 35 is as described above, and the first fold line FL1 extending from the rear end edge 41R of the hip extension and contraction portion 41 reaches this. The first fold line FL1 opposes the force of the rear end edge 35R of the narrow portion 35 moving inward in the lateral direction W, and makes the rear end edge 35R of the narrow portion 35 less likely to move inward in the lateral direction W. As shown in FIG. 8, the absorbent core 31 in the region overlapping the waist expansion and contraction portion 45 shrinks the waist expansion and contraction portion 45 to shorten the length in the lateral direction W. At this time, the region R11 that is closer to the rear side of the narrower portion 35 and further to the outer side in the widthwise direction than the crotch elastic portion 41 is the contraction of the waist elastic portion 45 with the rear end edge 35R of the narrow portion 35 as the base point However, it is easily deformed toward the inside of the widthwise direction W. At this time, the rear end edge 35R of the narrow portion 35 becomes a deformation base point, and it is not easy to move inward in the lateral direction W. The rear end edge 35R of the narrow portion 35 located on the rear side of the hip expansion and contraction portion 41 is less likely to move inward in the widthwise direction W, and it is easier to secure the widthwise direction W of the absorbent core 31 in the rear waist region S2 The length can suppress the back leakage.

As shown in FIG. 8, the waist expansion and contraction portion 45 has a first area 451 and a second area 452 that has a higher elongation in the widthwise direction than the first area 451, and a rear end of the expansion and contraction portion 41 from the bottom The first region 451 may be arranged on the first extension line EL1 extending toward the rear side of the edge 41R. The second area 452 is provided in the area at the center in the widthwise direction of the disposable paper diaper and the outside of the waist stretch portion 45. The first area 451 is sandwiched by the second area 452. The first region 451 and the second region 452 of the waist stretch part 45 have different elongations in the lateral direction. The first region 451 has a low elongation and is less likely to shrink than the second region 452. Since the first region 451 is provided on the first extension line EL1, the region deformed convexly due to the contraction of the hip expansion and contraction portion 41 is less likely to be narrowed in the widthwise direction due to the contraction of the waist expansion and contraction portion 45, and is easy Maintain the convex deformation state. In addition, in a form in which a plurality of elastic members constituting the crotch expansion and contraction portion 41 are provided, at least the first region 451 may be arranged on at least the first extension line EL1 of any elastic member.

In addition, the elongation of the waist expansion and contraction portion 45 can be adjusted by making the elongation ratio at the time of manufacturing different or the number of elastic members arranged differently. Moreover, in the form in which the waist stretchable portion 45 is stretched by the gear in the lateral direction W, when stretched by such a gear, the rolling of the gear in the region (for example, the first region 451) that reduces the elongation is weakened. The gear rolling in the region (for example, the second region 452) that increases elongation is enhanced. The strength of the gear rolling can be adjusted by changing the depth of the convex portion of the gear, the pitch of the convex portion of the gear, and the number of times the gear is rolled. The elongation rate of the region that is forcibly extended becomes relatively high, and the elongation rate of the region that is extended as it becomes relatively low.

The second region 452 may be disposed on the second extension line EL2 that extends toward the rear side from the region (the side region R31 shown in FIG. 8) that is more outward in the lateral direction than the lower crotch portion 41. The second extension line EL2 is a line extending from the side region R31 toward the rear side, and a plurality of positions are provided at different positions in the lateral direction. It suffices to arrange the second region 452 on any of the second extension lines EL2. In the region outside the crotch expansion and contraction portion in the widthwise direction, the absorbent core 31 is more easily deformed toward the inside in the widthwise direction using the rear end edge 35R of the narrow portion 35 as a base point. The rear end edge 35R of the narrow portion 35 located on the rear side of the hip expansion and contraction portion 41 is less likely to move inward in the widthwise direction W, and it is easier to secure the widthwise direction W of the absorbent core 31 in the rear waist region S2 The length can suppress the back leakage.

The leg circumference expansion and contraction portion 42 may be disposed on the first imaginary line VL1 that connects the front end edge of the engagement portion 93 of the hook and loop fastener 91 and the rear end edge 41R of the crotch expansion and contraction portion 41. When wearing an adhesive tape type disposable diaper 10, first, with the disposable paper diaper 10 unfolded, place the wearer's buttocks behind the disposable paper diaper 10 Waist circumference S2. Furthermore, the disposable diaper 10 is passed between the wearer's legs, and the paper diaper is pulled toward the side of the crotch region to cover the body with the crotch region. Then, the engaging portion 93 of the hook-and-loop fastener 91 is locked to the front waist region S1. As shown in FIG. 1, the first imaginary line VL1 connecting the front end edge of the inner edge of the engaging portion 93 and the rear end edge of the crotch expansion and contraction portion acts when the hook-and-loop fastener 91 is pulled toward the wide side when worn The pulling force of the outside. By the operation at the time of wearing, the rear end edge 41R of the crotch expansion and contraction portion 41 is pulled outward in the widthwise direction W, and the absorbent core 31 deformed to be convex by the crotch expansion and contraction portion 41 toward the body side also moves in the widthwise direction The outside is pulled. Therefore, the convex deformation of the absorbent core 31 suppresses collapse inward in the lateral direction, and it is easy to maintain the convex deformation state toward the body side. Moreover, the leg circumference expansion-contraction part 42 is arrange|positioned on the 1st imaginary line VL1, and the leg circumference expansion-contraction part 42 can be pulled up when wearing. Therefore, the fit to the excretory opening between the crotch and the fit to the leg circumference can be improved, and the leakage can be further suppressed.

A pair of deformation base point portions 85 may be provided in the absorbent core 31 on the rear side of the crotch expansion portion 41. During wearing, when the disposable diaper 10 is passed between the wearer's legs and the diaper is pulled toward the lower crotch region, the absorbent core 31 is easily deformed using the deformed base point portion 85 as a base point. The deformation base point portion 85 is provided on the rear side of the lower crotch expansion section 41 located in the crotch region, and the deformation base point of the absorbent core 31 is formed on the rear side of the lower crotch expansion section 41. The deformation base point portion 85 extends toward the outer side in the lateral direction W toward the rear side, and the absorbent core 31 is formed with a deformation base point extending toward the inner side in the lateral direction W from the back waist region toward the crotch region. In this way, when the buttocks are placed on the back waist region and the paper diaper is pulled toward the lower crotch region, the absorber is deformed by a base point extending from the back waist region toward the crotch region toward the inner side in the widthwise direction W. Specifically, as shown in FIG. 9, the absorber in the region where the deformation base point portion 85 is provided is deformed from the outer edge 72E (the base edge edge 85E of the deformation base point portion 85) of the high rigidity portion 72 as the base point, and will be The outer side edge 72E is positioned further inward in the lateral direction W than the outer side edge 72E is positioned further outward in the lateral direction W on the skin surface side. The main reason why the inner region of the widthwise direction W from the outer edge 72E is arranged on the skin surface side of the outer side of the widthwise direction W from the outer edge 72E is because of the The contraction pulls the center of the absorbent core 31 in the widthwise direction W toward the body side, and when the wearer pulls the diaper, generally a force is applied to the center of the absorbent core 31 in the widthwise direction W; and when worn, the absorbency With the outer portion of the article (for example, near the leg circumference opening) caught in the leg, the center of the absorbent core 31 in the widthwise direction W is pulled up. The absorbent core 31 is deformed using the deformed base point portion 85 as a base point, so that the length in the lateral direction W becomes shorter toward the crotch region side. As shown in FIGS. 6 and 7, the absorbent core 31 located on the front side of the deformation base portion 85 is deformed convexly toward the body side by the contraction of the pair of hip extensions 41, so that the central region R32 The side area R31 stands up. Therefore, by arranging the absorbent core 31 in the sub-crotch region along the body side, the absorbent core 31 can be appropriately accommodated in the crotch of the wearer. The absorbent core 31 is covered with a wide area relative to the wearer's buttocks, and the absorbent core 31 can be tightly accommodated in the gap between the wearer's legs. By disposing the disposable diaper at an appropriate position between the crotch of the wearer, the front waist region can be pulled until covering the wearer's abdomen. Adhesive tape disposable diapers can properly cover the wearer's body and can suppress leakage.

As shown in FIG. 1, the deformation base point portion 85 may be disposed more inward in the widthwise direction than the second virtual line VL2 connecting the rear end edge 41R of the crotch expansion and contraction portion 41 and the rear end edge 35R of the narrow portion 35. The second imaginary line VL2 connecting the rear end edge of the crotch expansion portion and the rear end edge of the narrow portion becomes a line forming the first fold line FL1, and moves inward in the widthwise direction with the rear end edge 35R of the narrow portion 35 Force against the line. The region sandwiched by the first fold line FL1 is arranged so as to cover the body. The absorbent core 31 is formed by deforming the base point portion 85 on the rear side of the hip expansion and contraction portion 41 in the region sandwiched by the first fold line FL1. The deformation base point portion 85 extends toward the outer side in the widthwise direction toward the rear side, and the absorbent core 31 is formed with a deformation base point extending from the back waist region S2 toward the crotch region S3 toward the inner side in the widthwise direction, toward the crotch region side, wide side The length of the direction W is deformed so as to become shorter. The absorbent core fits from the wearer's buttocks to the crotch to further suppress leakage.

The angle α with respect to the second imaginary line VL2 in the widthwise direction may be smaller than the angle β with respect to the deformation base point portion 85 in the widthwise direction. Since the angle α with respect to the second imaginary line VL2 in the widthwise direction is small, the movement of the rear end edge 35R of the narrow portion 35 toward the inside in the widthwise direction can be further suppressed, and the absorbent core in the rear waist region S2 can be further secured 31 width. In addition, since the angle β with respect to the width direction of the deformation base point portion 85 is relatively large, by partially deforming the region sandwiched by the second imaginary line VL2, it is possible to move closer to the wider side than the deformation base point portion 85 The area outside the direction covers the body. Therefore, the absorbent core can cover the buttocks with a wide area, and leakage can be suppressed.

The outer edge of the crotch expansion and contraction portion 41 may be disposed outside the outer edge of the deformation base portion 85 in the lateral direction W. However, it is more suitable that the outer edge of the crotch expansion and contraction portion 41 is disposed more inward of the lateral direction W than the outer edge of the deformation base point portion 85. According to such a structure, the deformation of the absorbent core 31 with the deformation base point portion 85 as a base point and the deformation of the absorbent core 31 due to the crotch expansion and contraction portion 41 are more easily interlocked. Therefore, it is easier to arrange the absorbent core 31 that deforms the length of the widthwise direction W from the back waist region toward the lower crotch region side closer to the body side in the lower crotch region. In addition, the outer edge of the lower crotch expansion portion 41 is the outer edge of the elastic member that is located most outward in the lateral direction W among the elastic members that constitute the lower crotch expansion portion 41. The thread rubber constituting the crotch expansion and contraction portion 41 of this embodiment is arranged along the front-rear direction, and the elastic member located outside the lateral direction W constitutes the outer edge of the crotch expansion and contraction portion 41.

The deformation base point portion 85 and the crotch expansion and contraction portion 41 may be shifted in the widthwise direction W. However, it is more suitable that at least a part of the deformation base point portion 85 is arranged on the first extension line EL1 extending from the rear end edge of the hip extension and contraction portion 41 toward the rear side. The deformation of the absorbent core 31 with the deformation base point portion 85 as the base point and the deformation of the absorbent core 31 caused by the crotch expansion and contraction portion 41 are more easily interlocked. Therefore, it is easier to arrange the absorbent core 31 that deforms the length of the widthwise direction W from the back waist region toward the lower crotch region side closer to the body side in the lower crotch region. In addition, in a form in which a plurality of elastic members constituting the crotch expansion and contraction portion 41 are provided, the deformation base point portion 85 may be disposed on at least the first extension line EL1 of any elastic member.

The deformation base point portion 85 may be the first intermediate line ML1 that spans between the center 10LC in the front-rear direction of the disposable paper diaper and the front-end direction L of the front end edge of the engaging portion 93 in the front-rear direction L. As shown in FIG. 1, the first intermediate line ML1 passes through the center 10LC of the front-rear direction of the disposable paper diaper and the center of the front-rear direction of the front end edge of the engaging portion 93, and extends in the widthwise direction W line. The rear side of the first intermediate line ML1 is a region where the buttocks are generally placed during wearing. The deformation base point portion 85 crosses the first intermediate line ML1 in the front-rear direction, and is arranged across the area where the buttocks cannot be placed from the area where the wearer's buttocks are placed. During wearing, in a state where the region on the back side of the first intermediate line ML1 is pressed by the buttocks, the region where the buttocks are not placed is pulled toward the front side, so that the absorbent core 31 is more easily deformed using the deformation base point 85 as a base point . Therefore, the absorbent core 31 is further deformed so that the width of the absorbent core 31 becomes shorter, and the disposable diaper is disposed at an appropriate position between the crotch of the wearer, so that the body of the wearer can be properly covered.

In addition, the rear end edge 41R of the crotch expansion and contraction portion 41 may be disposed on the front side of the first intermediate line ML1. The rear end edge 41R of the hip extension and contraction portion 41 is arranged in a region where the wearer's buttocks are not placed. When wearing, in a state where the region on the back side of the first intermediate line ML1 is pressed by the buttocks, the region where the buttocks are not placed is pulled toward the front side, so that the crotch expansion and contraction portion 41 is more easily extended. Therefore, it is easier to pull up the area where the crotch expansion and contraction portion 41 is arranged with respect to the body, and the absorbent core 31 can be further appropriately accommodated in the crotch of the wearer. Furthermore, in the modification, the rear end edge 41R of the crotch expansion and contraction portion 41 may be disposed on the rear side of the first intermediate line ML1. When wearing, in a state where the rear end edge 41R of the crotch expansion and contraction portion 41 is pressed by the buttocks, the front end edge 41F side of the crotch expansion and contraction portion 41 is pulled toward the front side, and the crotch expansion and contraction portion 41 is easily extended. Therefore, by pulling up the region where the crotch expansion and contraction portion 41 is arranged with respect to the body, the absorbent core can be further appropriately accommodated in the crotch of the wearer.

The front end edge of the deformation base point portion 85 may be disposed on the front side of the second intermediate line ML2 located between the rear end edge of the deformation base point portion 85 and the rear end edge of the crotch expansion and contraction portion 41 in the front-rear direction. As shown in FIG. 1, the second intermediate line ML2 is a line extending in the widthwise direction W through the middle of the front-back direction of the rear end edge of the deformation base point portion 85 and the rear end edge 41R of the crotch expansion and contraction portion 41. In a region between the rear end edge of the deformation base portion 85 and the rear end edge of the crotch expansion and contraction portion 41, the deformation base portion 85 is provided across more than half of the area. Therefore, the deformation of the absorbent core 31 with the deformation base point portion 85 as the base point and the deformation of the absorbent core 31 due to the crotch expansion and contraction portion 41 are more easily interlocked. Therefore, it is easy to deform the absorbent core 31 along the shape of the body from the back waist region S2 to the lower crotch region S3, and the absorbent core 31 is tightly arranged in the lower crotch region by covering the hips. By disposing the disposable diaper at an appropriate position between the crotch of the wearer, the body of the wearer can be properly covered.

A high-rigidity portion having a higher rigidity than the deformation base point portion 85 on the outer side in the lateral direction W may be provided between the pair of deformation base point portions 85. In this embodiment, the outer portion of the rear high-rigidity portion constitutes the deformation base point portion 85, and the area between the outer portions of the rear high-rigidity portion constitutes the high-rigidity portion of this structure. By providing a high-rigidity portion between the deformation base points 85, a difference in rigidity between the area outside the deformation base point 85 in the widthwise direction W and the area inside the deformation base point 85 is generated by the deformation base point 85 is the base point, making the absorbent core 31 more easily deformed. Therefore, the absorbent core 31 is easily deformed toward the lower crotch region side so that the length in the widthwise direction W becomes shorter, and the absorbent core 31 is more easily stored in the crotch of the wearer. By disposing the disposable diaper in a proper position between the crotch of the wearer, the body of the wearer can be properly covered. In addition, in a deformation base portion having a relatively low rigidity (for example, a deformation base portion formed by a low basis weight portion), the rigidity of the high-rigidity portion between the pair of deformation base portions 85 may be higher than the rigidity of the deformation base portion.

The high rigidity portion between the pair of deformation base points 85 and the deformation base point 85 may be adjacent to each other in the widthwise direction W. The area outside the deformation base point portion 85 in the lateral direction W is easily deformed relative to the area between the deformation base point portions 85, and the absorbent core 31 is more easily deformed due to the difference in rigidity. In addition, the pair of deformation base portions 85 are integrated by the high rigidity portion. The deformation base portion 85 and the high-rigidity portion are integrated to be easily deformed convexly toward the wearer's side, and the absorbent core 31 is more easily accommodated between the wearer's crotch.

The deformed base point portion 85 and the high-rigidity portion between the deformed base point portion 85 of the present embodiment are both constituted by the rear high-rigidity portion formed by the press portion. In this way, the deformation base point portion 85 and the high-rigidity portion may be integrally formed, and the boundary between the deformation base point portion 85 and the high-rigidity portion may not be formed. The entire rear high-rigidity portion only needs to function as the deformation base portion 85 and the high-rigidity portion. In addition, the deformation base portion 85 formed by the press portion has high rigidity, and it is easier to stabilize the deformation of the absorbent core 31.

The pair of deformed base points 85 are disposed between the center of the disposable paper diaper in the widthwise direction W, and at least a portion of the deformed base point portions 85 are positioned between the center of the absorbent core 31 in the widthwise direction W and the absorbent core 31 The third intermediate line ML3 at the center of the largest width of the image should be arranged outside the widthwise direction W. As shown in FIG. 1, the third intermediate line ML3 is a line extending in the front-rear direction passing through the center of the absorbent core 31 in the widthwise direction W and the center of the maximum width of the absorbent core 31. In a region of more than half of the width direction W of the absorbent core 31, the absorbent core 31 is easily deformed using the deformation base point portion 85 as a base point. In a wide range of the absorbent core 31, the absorbent core 31 is easily deformed so that the length in the lateral direction W of the crotch region side becomes shorter, and the absorbent core 31 is more easily stored in the crotch of the wearer.

The leg circumference expansion and contraction portion 42 may be disposed on the third extension line EL3 extending outward from the deformation base point portion 85 in the lateral direction W. The third extension line EL3 is a line extending from an arbitrary position of the deformation base point portion 85 toward the outside of the lateral direction W, and a plurality of positions are provided at different positions in the front-rear direction. It is sufficient that at least a part of the leg expansion and contraction portion 42 is arranged on any third extension line EL3. When the buttocks are placed on the back waist region and the diaper is pulled toward the crotch region side, while pressing the back waist region with the buttocks, the region outside the absorbent core 31 in the widthwise direction W is tightly attached to the legs. Since the absorbent core 31 is deformed in a state in which the leg circumference stretch portion and the buttocks are close to the body, the central region R32 is easier to stand up to the side region R31 on the front side than the buttocks, so that the absorbent core 31 is deformed at the base point The portion 85 is more easily deformed as a base point.

Moreover, the leg circumference expansion-contraction part 42 should just be arrange|positioned on the extension line extended to the outer side of the lateral direction W from the crotch expansion-contraction part 41. By deforming the absorbent core 31 in a state where the leg circumference expansion and contraction part is attached to the body, the central region R32 is easier to stand up with respect to the side region R31. The contraction of the crotch expansion and contraction portion 41 makes it easier to pull up the absorbent core 31 toward the wearer. The leg circumference expansion-contraction part 42 only needs to extend toward the rear side toward the outside in the lateral direction W. The leg circumference expansion and contraction portion which extends toward the outer side in the lateral direction W is closely attached to the body, and the wearer's buttocks can be covered with disposable paper diapers. In a state where the buttocks are covered with a wide range toward the rear side, the absorbent core 31 can be deformed so that the length in the widthwise direction W of the absorbent core 31 in the crotch region becomes shorter. While the absorbent core 31 is properly accommodated in the crotch of the wearer, the body is covered by a disposable paper diaper to prevent leakage.

On the outer side of the absorbent core 31 in the widthwise direction W, there is a side wing portion 27 extending outward in the widthwise direction W toward the rear side, and the side wing portion 27 may be disposed on the second extension line EL2. The portion of the side flap portion 27 extending outward in the lateral direction W toward the rear side of the disposable diaper of the disposable diaper, that is, the portion indicated by diagonal lines in FIG. 1. When placing the buttocks in the back waist area and pulling the diaper toward the crotch area, while pressing the back waist area with the buttocks, it is easier for the lateral wings outside the absorbent core 31 in the widthwise direction W to contact the legs . Therefore, the absorbent core 31 is deformed in a state where the side wing portion located outside the lateral direction W and the region where the buttocks are placed, and the deformed base point portion 85 is used as the base point to deform more easily.

The low basis weight part 33 may be arranged in a region overlapping the crotch expansion and contraction part 41. The absorbent core 31 is deformed using the low basis weight portion extending in the front-rear direction as a base point during wearing. Therefore, the contraction of the crotch expansion and contraction portion 41 makes the absorbent core 31 more easily deformed convexly toward the body side, and the absorbent core 31 can be appropriately accommodated in the crotch of the wearer. The low basis weight portion 33 that becomes the deformation base point of the absorbent core 31 has a lower basis weight than the surrounding area, and can absorb the body fluid even after the thickness is suppressed, and the deformed state can be maintained.

The "basic weight of absorbent core" in this specification is measured by the following measurement method. When the disposable paper diaper 10 is enclosed in a package, etc., use the sample taken out of the package and put it in a state of 20℃±2℃, relative humidity 60%±5%RH for 12 hours under such conditions . In the disposable paper diaper packaged by the packaging sheet, the packaging sheet is unsealed, and the folded disposable paper diaper is unfolded. Next, a portion for measuring the basis weight is cut out from the disposable paper diaper, and the portion other than the absorbent core such as a surface sheet is removed from the cut out portion. Then, the area and weight of the measured basis weight of the absorbent core are measured. Calculate the basis weight based on weight and area.

The "bending rigidity" in this specification may be a value measured based on Gurley rigidity. For the measurement of Gurley's rigidity, No.311 Gurley type softness testing machine manufactured by Yasuda Seiki Co., Ltd. can be used for measurement in accordance with JIS-L1096. The length of the sample of the Gurley rigidity measurement in the widthwise direction W can be set to 30 mm, and the length in the front-rear direction can be set to 25 mm.

The "elongation" in this specification refers to the degree of elongation, and is performed by the following measurement method. First, when a disposable paper diaper is enclosed in a packaging bag, etc., the disposable paper diaper is taken out from the packaging bag. Secondly, the arrangement area of the stretchable sheet or the like constituting the waist stretcher is cut out, and a sample to be measured is prepared. The state in which such a sample is left in an environment of 20°C±2°C and a relative humidity of 60%±5%RH for 24 hours is called a “natural state”.

Third, in such a natural state, between the absorbent core-side end (front-side end) of the waist expansion and contraction part and the waist opening-side end (rear side end) of the waist expansion and contraction part, that is, before and after In the middle of the direction L, dots (stamps) are intermittently marked along the widthwise direction W. Such a point is based on the center of the widthwise direction W of the waist expansion and contraction portion, and the point is marked from the reference to the end of the widthwise direction W of the sample of the waist expansion and contraction at a distance of 5 mm from the left and right of the width direction W (Stamp). 4th measures the distance between adjacent points. Let this distance be the length of the natural state (since the mark is marked at 5 mm intervals, it is 5 mm). The fifth measurement is the distance between the previous one mark from the natural state to the state where wrinkles caused by the elastic member cannot be visually confirmed on the stretchable sheet. Sixth, the elongation is calculated using the formula of elongation (times) of each part=(distance between marks in the extended state)/(distance between marks in the natural state).

In the above, although the present invention has been described in detail using the above-mentioned embodiments, it is obvious to the industry that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and a modification without departing from the meaning and scope of the present invention established by the description of the patent application scope. Therefore, the descriptions in this specification are for illustrative purposes, and are not intended to limit the present invention.

In addition, the entire contents of Japanese Patent Application No. 2018-152781 filed on August 14, 2018 are incorporated into this specification by reference. [Industry availability]

According to the present invention, it is possible to provide a disposable diaper that can secure the fit between the crotch of the body and the fit of the buttocks while suppressing leakage.

10: disposable diapers 10LC: the center of the front and back of the paper diaper 10WC: The center of the paper diaper in the widthwise direction 21: Surface flakes 22: Side sheet 23: Inside slice 24: Exterior thin slices 27: Flank 30: Absorber 31: Absorbent core 32: core cladding 33: Low basis weight 41: Crotch extension 42: Leg extension 43: Leak-proof telescopic part 45: waist stretch 51: Instruction Department 71: Central high rigidity section 72: Rear high rigidity 81: Decoration Department 85: Deformation base point 91: Velcro 92: base 93: Engagement Department 95: Target Department EL1: 1st extension cable EL2: 2nd extension cable VL1: 1st imaginary line VL2: 2nd imaginary line ML1: 1st middle line ML2: 2nd middle line ML3: 3rd middle line S1: Front waist area S2: back waist area S3: Crotch domain L: front and back direction T: thickness direction T1: skin side T2: Non-skin side W: wide side direction 85E: cardinal edge 72E: outer edge 72S: Outer side 70: High rigidity R11: overlapping areas α: angle β: angle 60: Leak-proof frills 61: Contraction 73: Front high rigidity part 62: Base point EL3: 3rd extension cable 41R: trailing edge 41F: front edge

[FIG. 1] It is the top view seen from the skin surface side of the disposable paper diaper of an embodiment. [Fig. 2] is a plan view of the absorbent core of the embodiment. [FIG. 3] It is a schematic cross-sectional view along the A-A cross section of the disposable paper diaper shown in FIG. [Fig. 4] is a schematic cross-sectional view along the B-B cross section of the disposable paper diaper shown in Fig. 1. [Fig. 5] is a schematic cross-sectional view along the C-C cross section of the disposable paper diaper shown in Fig. 1. [Fig. 6] A diagram schematically showing the wearing state in the A-A section of the disposable diaper. 7 is a diagram schematically showing the wearing state of the disposable diaper of the present embodiment. [Fig. 8] A diagram for explaining the deformation of the absorbent core during wearing. [Fig. 9] A diagram for explaining the deformation of the absorber in the B-B section of the disposable diaper.

10: disposable diapers

10LC: the center of the front and back of the paper diaper

10WC: The center of the paper diaper in the widthwise direction

21: Surface flakes

22: Side sheet

23: Inside slice

27: Flank

30: Absorber

31: Absorbent core

41F: front edge

41R: trailing edge

42: Leg extension

43: Leak-proof telescopic part

45: waist stretch

60: Leak-proof frills

61: Contraction

62: Base point

70: High rigidity

71: Central high rigidity section

72: Rear high rigidity

72E: outer edge

72S: Outer side

73: Front high rigidity part

85: Deformation base point

85E: cardinal edge

91: Velcro

92: base

93: Engagement Department

EL1: 1st extension cable

EL3: 3rd extension cable

L: front and back direction

ML1: 1st middle line

ML2: 2nd middle line

ML3: 3rd middle line

R11: overlapping areas

S1: Front waist area

S2: back waist area

S3: Crotch domain

VL1: 1st imaginary line

VL2: 2nd imaginary line

W: wide side direction

α: angle

β: angle

Claims (12)

A disposable paper diaper is equipped with: orthogonal front and back directions and wide side directions; A front waist region, a back waist region, and a crotch region disposed between the front waist region and the back waist region; An absorbent core disposed at least in the aforementioned back crotch domain; and A pair of hip extensions arranged on both outer sides of the center of the absorbent core in the widthwise direction and extending in the front-rear direction, The absorbent core has a narrow portion with a shorter length in the widthwise direction than the front and rear portions. The disposable diaper is characterized by: At least a part of the crotch expansion and contraction portion is arranged in the narrow portion on the inner side in the widthwise direction from the outer edge of the absorbent core, The rear end edge of the crotch expansion and contraction portion is arranged more forward than the rear end edge of the narrow portion. The disposable diaper described in item 1 of the patent application scope, wherein the front end edge of the crotch expansion and contraction portion is arranged behind the front end edge of the narrow portion. The disposable paper diaper as described in the first or second paragraph of the patent application, wherein the distance between the crotch expansion part and the outer edge of the absorbent core is 1 to the length between the outer edge of the absorbent core /4 or more. The disposable diaper as described in the first or second patent application, which has a pair of side sheets arranged on the skin side of the absorbent core and covering the outer side of the absorbent core , The side sheet constitutes a pair of leak-proof frills, and has a contraction portion erected by contraction of the leak-proof elastic member and an outer side of the contraction portion in the widthwise direction, which becomes the standing portion of the contraction portion The base point of the fulcrum, The distance between the apex of the constricted portion and the widthwise direction of the base point portion is longer than the distance between the outer edge of the absorbent core in the narrow portion and the widthwise direction of the crotch expansion and contraction portion. The disposable diaper described in item 1 or 2 of the patent application scope, wherein the crotch expansion and contraction portion has a first side disposed on the one side with respect to the center of the absorbent core in the widthwise direction 1 lower crotch expansion part, and a second lower crotch expansion part arranged on the other side with respect to the center of the absorbent core in the lateral direction, The first lower crotch expansion part and the second lower crotch expansion part each have a plurality of elastic members arranged at intervals in the widthwise direction, The distance between the elastic members of the first crotch elastic portion and the distance between the elastic members of the second crotch elastic portion are not more than three times the thickness of the absorbent core. The disposable diaper as described in the first or second paragraph of the patent application scope, wherein the absorbent core in the crotch region is provided with a relatively surrounding area between the pair of crotch expansion parts More rigid high rigidity part, The high rigidity portion spans the center of the absorbent core in the widthwise direction. The disposable diaper described in item 1 or 2 of the patent application scope, wherein the rear waist region has at least a waist expansion and contraction portion that expands and contracts in the widthwise direction, The waist expansion and contraction portion is located on the rear side of the narrow portion and outside of the crotch expansion and contraction portion in the lateral direction, and is disposed in a region overlapping the absorbent core. The disposable paper diaper as described in item 7 of the patent application scope, wherein the waist elastic portion has a first region and a second elongation in the widthwise direction that is higher than the first region area, The first region is arranged on a first extension line extending rearward from the rear end edge of the crotch expansion and contraction portion. A disposable paper diaper as described in item 8 of the patent application scope, wherein the first extension line is arranged on the second extension line extending toward the rear side from the area outside the crotch expansion and contraction portion in the widthwise direction 2 area. The disposable diaper as described in item 1 or 2 of the patent application scope, which includes: a buckle arranged in the rear waist region and having an engaging portion that is engaged with the front waist region Belt, and The leg circumference expansion and contraction part which expands and contracts in the said front-back direction on the outer side of the said width direction than the said absorbent core, The leg circumference expansion and contraction portion is arranged on a first imaginary line connecting the front end edge of the inner edge of the engagement portion and the rear end edge of the crotch expansion and contraction portion. The disposable diaper as described in the first or second patent application, which has a hook-and-loop fastener disposed in the rear waist region and having an engaging portion that is engaged with the front waist region, A pair of deformation base portions extending toward the rear side outward of the widthwise direction and disposed at intervals in the widthwise direction of the absorbent core on the rear side of the under-hip stretchable portion, The deformation base point portion is arranged further inward in the widthwise direction than the second imaginary line connecting the rear end edge of the crotch expansion and contraction portion and the rear end edge of the narrow portion. The disposable paper diaper described in item 11 of the patent application range, wherein the angle in the widthwise direction with respect to the second imaginary line is smaller than the angle in the widthwise direction with respect to the deformation base point portion.

Images