WO2020036164A1

WO2020036164A1 - Disposable diaper

Info

Publication number: WO2020036164A1
Application number: PCT/JP2019/031796
Authority: WO
Inventors: 真衣香 ▲高▼橋; 坂口　智; 山中　康弘; 拓巳市原
Original assignee: ユニ・チャーム株式会社
Priority date: 2018-08-14
Filing date: 2019-08-13
Publication date: 2020-02-20
Also published as: JP7097260B2; CN112566600A; CN112566600B; JP2020025790A

Abstract

Provided is a disposable diaper wherein an absorbent core deforms so as to follow the crotch of a body, the absorbent core is arranged so as to follow sections of the wearer other than the crotch, and leakage can be prevented. The disposable diaper (10) has the absorbent core (31) arranged on at least an inside leg area (S3). A pair of low-basis weight sections (33) are formed in the absorbent core in the inside leg area, extending in the front rear direction and arranged having an interval therebetween in the width direction. The absorbent core has provided therein a highly rigid section including a rear highly rigid section (72) and a front highly rigid section (73) which have higher rigidity than surrounding areas. The highly rigid section straddles: an inner line (33IL) that extends in the front rear direction from an end, in the front rear direction, on the inside edge of the low-basis weight sections; and an external line (33EL) extending in the front rear direction from an end, in the front rear direction, on an outside edge of the low-basis weight sections.

Description

Disposable diapers

The present invention relates to a disposable diaper having a pair of low basis weight portions extending in the front-rear direction in a crotch region.

使い A disposable diaper having a pair of groove-shaped portions extending in the front-rear direction in a crotch region is known (for example, see Patent Document 1). The groove-shaped portion serves as a deformation base point of the absorbent core. The absorbent core of the disposable diaper configured as described above is deformed from the groove-shaped portion extending in the front-rear direction when worn, and is deformed in the thickness direction (for example, see FIG. 4 of Patent Document 1).

JP 2018-473 A

However, the above-mentioned disposable diaper has the following problems.
The groove portion is a portion where the absorbent core is compressed in the thickness direction. For this reason, when the bodily fluid is absorbed, the groove-shaped portion expands, and the deformed state of the absorbent core may not be maintained.

In addition, disposable diapers are worn so as to cover the abdomen from the buttocks of the wearer. In the disposable diaper of Patent Literature 1, the groove portion extends in the front-rear direction, and the deformation starting from the groove portion also extends in the front-rear direction. However, the shape of the body on which the disposable diaper is worn is the narrowest in the crotch, and swells outward in the width direction from the crotch to the buttocks. Therefore, when the deformation of the absorbent core fitted to the wearer's crotch continues to the rear waist region and the front waist region, the disposable diaper does not fit the buttocks and abdomen, and a gap between the body and the disposable diaper occurs. , There was a risk of leakage.

Therefore, a disposable diaper capable of suppressing leakage by disposing the absorbent core along a part other than the wearer's crotch while deforming the absorbent core along the crotch of the body is desired.

The disposable diaper according to one aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region arranged between the front waist region and the rear waist region, at least the crotch The absorbent core disposed in the region and the absorbent core in the crotch region are disposable diapers formed with a pair of low-basis weight portions extending in the front-rear direction and arranged at intervals in the width direction. In addition, the absorbent core is provided with a high-rigidity portion having higher rigidity than a peripheral region, and the high-rigidity portion extends from the front-rear direction edge of the inner edge of the low-basis weight portion in the front-rear direction. And an outer extension extending in the front-rear direction from an end edge in the front-rear direction of the outer edge of the low-basis weight portion.

It is the top view seen from the skin side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core concerning an embodiment. FIG. 2 is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. 1. FIG. 2 is a schematic cross-sectional view along a BB cross section of the disposable diaper shown in FIG. 1. FIG. 2 is a schematic cross-sectional view along a CC cross section of the disposable diaper shown in FIG. 1. It is the figure which showed typically the mounting state in the AA cross section of a disposable diaper. It is a figure for explaining a modification of an absorber in a BB section of a disposable diaper. It is the figure which showed typically the mounting state of the disposable diaper which concerns on embodiment. It is a figure showing an absorption core which has a modification origin part concerning a modification.

(1) Outline of Embodiment At least the following matters will be apparent from the description of the present specification and the accompanying drawings.
The disposable diaper according to one aspect is a front and rear direction and a width direction that are orthogonal to each other, a front waist region, a rear waist region, and a crotch region arranged between the front waist region and the rear waist region, and at least the crotch region. The absorbent core disposed in the region and the absorbent core in the crotch region include a disposable diaper in which a pair of low-basis weight portions extending in the front-rear direction and arranged at intervals in the width direction are formed. In addition, the absorbent core is provided with a high-rigidity portion having higher rigidity than a surrounding region, and the high-rigidity portion extends from the front-rear direction edge at the inner edge of the low-basis weight portion. And an outer extension extending in the front-rear direction from an end edge in the front-rear direction of the outer edge of the low-basis weight portion.

According to this aspect, the absorbent core in the crotch region is deformed based on the low basis weight portion extending in the front-rear direction when worn, deforms in the thickness direction, and easily fits in the wearer's crotch. Since the high rigidity portion is provided across the inner extension line and the outer extension line, the deformation due to the low basis weight portion can be divided by the high rigidity portion. It is possible to suppress the formation of the deformation base point due to the low basis weight portion over the entire region in the longitudinal direction of the absorbent core, and to suppress the occurrence of a gap between at least one of the buttocks and the abdomen and the disposable diaper. Therefore, while deforming the absorbent core along the crotch of the body, the absorbent core can be made to follow at least one of the buttocks and the abdomen of the wearer, and leakage can be suppressed. In addition, the low basis weight portion, which is the deformation base point of the absorbent core, has a lower basis weight than the surrounding region, and the thickness can be suppressed even after absorbing the bodily fluid, and the deformed state can be maintained.

According to a preferred aspect, the high-rigidity portion has a high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line, and the side-edge extension line extending along the high-rigidity side edge is: It may intersect the outer edge of the absorbent core. According to this aspect, the deformation of the absorbent core starting from the low basis weight portion extends along the outer extension line or the inner extension line, and easily reaches the high rigidity side edge. The deformation that has reached the high rigidity side edge extends along the high rigidity side edge and the side edge extension line. Since the side edge extension line intersects the outer edge of the absorbent core, deformation from the crotch region side is easily guided to the outer edge of the absorbent core. The effect of dividing the deformation due to the low basis weight portion at the front high rigidity portion and the rear high rigidity portion is more easily obtained. In addition, in the region on the front side of the front high-rigidity portion and the region on the rear side of the high-rigidity portion, the influence of the deformation due to the low-basis weight portion is reduced, and the fit to the buttocks and abdomen is more easily secured.

According to a preferred aspect, an intersection between the extended side edge line and the outer edge of the absorbent core may be located outside the highly rigid side edge in the front-rear direction. According to this aspect, the deformation due to the low basis weight portion can be guided to a position away from the crotch. Therefore, the absorbent core is more easily fitted along at least one of the buttocks and the abdomen of the wearer while deforming the absorbent core so as to be along the crotch of the body.

According to a preferred aspect, the absorbing core has a narrow portion whose length in the width direction is shorter than a maximum width of the absorbing core, and an intersection between the side edge extension line and an outer edge of the absorbing core. May be arranged in the narrow portion. According to this aspect, the deformation due to the low basis weight portion is guided to the narrow portion, and the deformation in the region of the maximum width of the absorbent core can be suppressed. The buttocks and abdomen can be covered by the region of the maximum width of the absorbent core, and leakage can be further suppressed.

According to a preferred aspect, the absorbing core has a narrow portion whose length in the width direction is shorter than a maximum width of the absorbing core, and an intersection between the side edge extension line and an outer edge of the absorbing core. May be arranged outside the narrow portion in the front-rear direction. According to this aspect, the deformation due to the low basis weight portion is more easily guided to the outer region in the front-rear direction than the narrow portion. At a position farther than the narrow portion, deformation due to leg movement is small. Therefore, even when the leg moves sharply, the absorbent core is not easily deformed, the length of the absorbent core in the width direction is secured, and the deformation due to the low basis weight portion can be absorbed. Therefore, even when the base of deformation along the groin of the wearer is formed on the absorbent core due to the movement of the leg, the deformation along the groin and the deformation by the low basis weight part are suppressed from interlocking. Thus, the length in the width direction of the absorbent core can be secured. Therefore, the buttocks and abdomen can be covered with the absorbent core, and leakage can be further suppressed.

According to a preferred embodiment, the distance between the high rigidity portion and the low basis weight portion in the front-rear direction may be 15 mm or more and 30 mm or less. According to this aspect, the distance in the front-rear direction between the high rigidity portion and the low basis weight portion is 15 mm or more, so that the deformation of the absorbent core due to the low basis weight portion does not directly reach the high rigidity portion, It is easy to reach when the deformation is weak. Therefore, the effect of dividing the deformation of the absorbent core by the high rigidity portion is more easily obtained. Further, since the distance between the high rigidity portion and the low basis weight portion in the front-rear direction is 30 mm or less, the region where the deformation of the low basis weight portion propagates in the front-rear direction is reduced, and the body is covered in a wide range. The absorbent core can be arranged at

According to a preferred aspect, the high rigidity portion is a front high rigidity portion disposed on the front side of the low basis weight portion, and a rear high rigidity portion disposed on the rear side of the low basis weight portion, May be provided. According to this aspect, it is possible to suppress the formation of the deformation base point due to the low basis weight portion over the entire region in the longitudinal direction of the absorbent core, and to suppress the generation of a gap between both the buttocks and the abdomen and the disposable diaper. While deforming the absorbent core along the crotch of the body, the absorbent core can be made to follow the buttocks and abdomen of the wearer, thereby suppressing leakage.

According to a preferred embodiment, the length of the rear high-rigidity portion in the front-rear direction may be longer than the length of the front high-rigidity portion in the front-rear direction. According to this aspect, since the length of the rear high-rigidity portion in the front-rear direction is long, deformation of the region with respect to the buttocks is suppressed, and it is easy to secure a space for storing stool. On the other hand, the front high rigidity portion has an effect of dividing the deformation of the low basis weight portion. The length of the front high rigidity portion in the front-rear direction is relatively short, and it is easy to secure the area of the absorbent core covering the front waistline region.

According to a preferred aspect, the center in the front-rear direction of the low basis weight portion is disposed rearward of the center in the front-rear direction of the disposable diaper, and the rear high rigidity portion and the low basis weight portion are disposed. May be shorter than the distance in the front-rear direction between the front high rigidity portion and the low basis weight portion. According to this aspect, since the low basis weight portion is biased to the rear side, a deformation based on the low basis weight portion can be provided on the buttocks side. Further, since the distance in the front-rear direction between the rear high rigidity portion and the low basis weight portion is relatively short, the deformation of the absorbent core based on the rear high rigidity portion and the deformation of the absorbent core due to the low basis weight portion are different. It becomes easier to work together. Therefore, it becomes easy to cover the buttocks with the absorbent core deformed so as to approach the body side in the crotch region, and it is possible to widely cover the buttocks along the shape of the buttocks. On the other hand, the distance in the front-rear direction between the front high rigidity portion and the low basis weight portion is relatively long, so that the deformation due to the low basis weight portion is weakened and the front high rigidity portion is easily reached. It is easier to obtain the effect that the deformation due to the low basis weight part can be separated by the front high rigidity part.

According to a preferred aspect, a fastening tape disposed in the rear waistline region, and the front high rigidity portion includes a front high rigidity side edge that intersects at least one of the outer extension line and the inner extension line. And the rear high rigidity portion has a rear high rigidity side edge intersecting at least one of the outer extension line and the inner extension line, and at least the front high rigidity side edge and the rear high rigidity side edge The rear high rigidity side edge extends inward in the width direction toward the inside in the front-rear direction, and the angle of the front high rigidity side edge with respect to the width direction is equal to the width of the rear high rigidity side edge with respect to the width direction. It may be smaller than the angle. According to this aspect, since the angle of the rear high-rigidity side edge with respect to the width direction is relatively large, the absorbent core can be deformed so that the length in the width direction of the absorbent core is reduced within a short range in the front-rear direction. . On the other hand, the front waistline region is a region where the rear waistline region and the inseam region are applied to the body at the time of wearing, and are finally applied. Therefore, it is preferable to arrange the front waistline region so as to cover the body in a flat state without providing a deformation base point at the time of wearing. Since the angle of the front high rigidity side edge with respect to the width direction is relatively small, the deformation due to the low basis weight portion can be gently divided, and the body can be covered by the flat front waist region.

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

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

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

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

The disposable diaper 10 includes an absorbent core 31 including an absorbent material. The absorbent core 31 includes an absorbent material such as ground pulp or superabsorbent polymer (SAP), or a mixture thereof. As shown in FIG. 3, the absorbent core 31 may be covered by a core wrap 32. The absorber 30 may be constituted by the absorbent core 31 and the core wrap 32. The core wrap 32 may be formed of a tissue and may be disposed on the skin side T1 of the absorbent core 31 and on the non-skin side T2 of the absorbent core 31.

表面 As shown in FIGS. 1 and 3, a top sheet 21 and a side sheet 22 may be provided on the skin side T1 of the absorber 30 including the absorption core 31. The topsheet 21 may be arranged across the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged so as to cover an outer portion of the top sheet 21. The top sheet 21 and the side sheets 22 may be formed of a liquid-permeable sheet such as a nonwoven fabric or a perforated plastic film. The inner portion of the side sheet 22 may be folded and overlapped. Between the overlapping side sheets 22, a leak-proof extension / contraction section 43 that extends and contracts in the front-rear direction L may be provided. The leak-proof extension / contraction section 43 may be made of a thread rubber that extends and contracts in the front-rear direction L. The side sheet 22 and the leak-proof expansion / contraction part 43 constitute leak-proof gathers 60 (see FIG. 6) that stand on the skin side T1 when worn. On the non-skin side T2 of the absorber 30, a back sheet 23 and an exterior sheet 24 may be provided. The exterior sheet 24 may be provided on the non-skin side T2 of the back sheet 23. The length of the back sheet 23 in the width direction W is shorter than the length of the outer sheet 24 in the width direction W, and the length of the back sheet 23 in the front-rear direction L is shorter than the length of the outer sheet 24 in the front-rear direction L. Good. The back sheet 23 may be formed of a liquid impermeable film. The exterior sheet 24 may be made of a liquid-permeable nonwoven fabric.

ファ Fastening tape 91 is provided on the outside of the rear waist area. The fastening tape 91 has a base portion 92 and an engaging portion 93. The base portion 92 is arranged between the exterior sheet 24 and the side sheet 22 in the thickness direction T, and extends outward from the exterior sheet 24 and the side sheet 22 in the width direction W. The engaging portion 93 is arranged on the base portion 92 and engages with the target portion 95 (see FIG. 5). The target portions 95 are arranged at intervals in the width direction in the front waistline region S1, and are configured such that the fastening tapes 91 are fixed thereto.

インジケータ Indicator 51 may be arranged between back sheet 23 and absorber 30. The indicator 51 may be arranged on the non-skin side T2 with respect to the absorbent core 31. The indicators 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight parts 33 described later. The indicator 51 is configured to be discolored by the absorption of the body fluid by the absorber 30, and to be able to grasp the absorption state of the body fluid from the non-skin side T2 of the disposable diaper 10.

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

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

The disposable diaper 10 may have a pair of crotch elastic portions 41 provided in a region overlapping the absorbent core 31 in the crotch region. The crotch elastic 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 absorber 30. The crotch elastic portion 41 may be disposed between the absorbent core 31 and the back sheet 23, or provided between the core wrap 32 and the back sheet 23 disposed on the non-skin side T2 than the absorbent core 31. May be provided between the absorbent core 31 and the core wrap 32 disposed on the non-skin side T2 with respect to the absorbent core 31, or may be provided between the back sheet 23 and the exterior sheet 24. Good. The crotch elastic portion 41 of the present embodiment is arranged between the back sheet 23 and the exterior sheet 24. The crotch elastic portions 41 extend in the front-rear direction L and are arranged at intervals in the width direction W. The crotch elastic portions 41 are not arranged at the center of the absorbent core 31 in the width direction W, but are arranged two each on both sides of the center of the absorbent core 31 in the width direction W. Therefore, due to the contraction of the crotch elastic portion 41, the absorbent core in the region overlapping the crotch elastic portion 41 is pulled up toward the body from the center in the width direction of the absorbent core. The pair of crotch elastic portions 41 may be located inside the outer edge of the absorbent core 31 in the width direction. The region located between the pair of crotch elastic portions 41 is pulled up toward the body with respect to the region outside the pair of crotch elastic portions 41 in the width direction. Therefore, the center in the width direction of the absorbent core is deformed in a convex shape with the side portion as a base point, and the fit to the crotch of the body can be secured. The inseam extension / contraction portion 41 is formed of a thread rubber arranged along the front-rear direction L. In other forms, the crotch elastic part 41 may be configured by a band-shaped elastic sheet that expands and contracts in the front-rear direction, may be configured by one thread rubber, or may be configured by three or more thread rubbers. It may be configured. Further, in the present invention, the overlapping state is a state in which one member and the other member overlap in a plan view, and the other member is arranged on the skin surface side or the non-skin surface side of one member. It is in the state that it is. The overlapping state includes not only a state in which one member and the other member are in contact with each other, but also a configuration in which another member is interposed between the one member and the other member.

The inseam expansion / contraction portion 41 may straddle the center 10LC of the disposable diaper in the front-rear direction. Due to the contraction of the inseam expansion / contraction portion 41, the center 10LC in the front-back direction of the disposable diaper can be pulled up toward the body. In particular, if the disposable diaper is folded in two so that the skin side faces each other before use, the folding habit due to folding can be raised. In other forms, the crotch elastic portion 41 does not straddle the center 10LC in the front-rear direction of the disposable diaper, and may be arranged only on the front side of the center 10LC or only on the rear side of the center 10LC. May be arranged.

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

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

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

The absorbent core 31 may have a low basis weight part 33 in which the basis weight of the absorbent material is lower than the surrounding area. The low basis weight portion 33 is provided along the front-back direction L. The low basis weight portion 33 only needs to extend in the front-rear direction L, and may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L. The low basis weight portion 33 is a portion in which the basis weight of the absorbent material is lower than that of the surrounding absorbent core 31, and is thinner and less rigid than the peripheral absorbent core 31. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. A deformation base point extending in the front-rear direction L when worn is likely to be formed on the absorbent core 31. The low basis weight portion 33 may be a portion where the basis weight of the absorbing material is substantially zero (including a portion where the design basis weight is 0, but the surrounding absorbing material is mixed), It may be a portion where an absorbent material having a smaller basis weight is disposed. The low basis weight portion 33 may be a slit having a fixed length in the width direction W, or may be a notch whose length in the width direction W is practically zero. The length in the width direction W of each low basis weight portion 33 may be 2 mm or more and 10 mm or less, and more preferably, the thickness of the absorbent core 31 or more and 8 mm or less. When the length in the width direction of the low basis weight portion 33 is equal to or greater than the thickness of the absorbent core 31, the absorbent core 31 is easily deformed in the thickness direction based on the low basis weight portion 33. Further, when the length in the width direction of the low basis weight portion 33 is 8 mm or less, anxiety about the absorption performance due to the long length in the width direction of the low basis weight portion can be suppressed. The length of the low basis weight portion 33 in the front-rear direction L may be 30 mm or more and 180 mm or less.

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

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

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

The central high rigidity portion 71 is provided in a region between the pair of low basis weight portions 33. The front edge 71F of the central high rigidity portion 71 may be coincident with the front edge 33F of the low basis weight portion 33 or may be located behind the front edge 33F of the low basis weight portion 33. The rear end edge 71R of the central high rigidity portion 71 may be located on the front side of the rear end edge 33R of the low basis weight portion 33. The center of the central high rigidity portion 71 in the front-rear direction may be disposed on the front side of the center of the low basis weight portion 33 in the front-rear direction. The central high-rigidity portion 71 may be arranged at an interval from the low-basis-weight portion 33 in the width direction W. The central high rigidity portion 71 may straddle the center 10LC in the front-rear direction of the disposable diaper and the center 10WC in the width direction W of the disposable diaper.

The crotch elastic portion 41 may be located on both sides of the center of the central high rigidity portion 71 in the width direction, and may extend rearward of the central high rigidity portion 71. The first region R41 in which the crotch elastic portion 41 is arranged on the rear side of the central high rigidity portion 71 and the first region R41 in which the central high rigidity portion 71 and the crotch elastic portion 41 overlap in the thickness direction or the width direction. A second region R 42 and a third region R 43 in which the central high-rigidity portion 71 is arranged on the front side of the crotch elastic portion 41 may be provided. The first region R1 and the second region R42 are adjacent in the front-rear direction L, and the second region R42 and the third region R43 are adjacent in the front-rear direction L. The rear edge of the first region R41 coincides with the rear edge 41R of the crotch elastic portion 41, and the front edge of the first region R41 coincides with the rear edge 71R of the central high rigidity portion 71. The rear edge of the second region R42 matches the front edge of the first region R41, and the front edge of the second region R42 matches the front edge 41F of the crotch elastic portion 41. The rear edge of the third region R43 matches the front edge of the second region R42, and the front edge of the third region R43 matches the front edge 71F of the central high rigidity portion 71.

The rear high rigidity portion 72 may be disposed on the rear side of the pair of low basis weight portions 33. The outer edge of the rear high rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front edge of the rear high rigidity portion 72 in the width direction W may be longer than the length of the central high rigidity portion 71 in the width direction W. The rear high rigidity portion 72 may straddle the center 10WC in the width direction W of the disposable diaper. The rear high rigidity part 72 constitutes the “high rigidity part” of the present invention. The rear high rigidity portion 72 is formed from an inner extension line 33IL extending in the front-rear direction L from an end edge in the front-rear direction L at an inner edge of the low basis weight portion 33 and an end edge in the front-rear direction L at an outer edge of the low basis weight portion 33. And the outer extension line 33EL extending in the front-rear direction L. That is, the rear high rigidity portion 72 is arranged in the entire width direction of the region extending rearward from the rear end edge of the low basis weight portion 33. Note that the inner edge and the outer edge of the low basis weight portion 33 indicate edges extending in the front-rear direction L. When a part of the side edge of the low basis weight portion has a sharp shape, the edge is a portion excluding the sharp shape.

The front high rigidity portion 73 may be arranged on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC in the width direction W of the disposable diaper with an interval in the width direction W. The front high rigidity side edge 73X, which is the front end edge of the front high rigidity portion 73, may extend frontward toward the outside in the width direction W. The front high rigidity portion 73 constitutes the “high rigidity portion” of the present invention. The front high rigidity portion 73 straddles the inner extension line 33IL and the outer extension line 33EL. That is, the front high-rigidity portion is disposed in the entire widthwise region of a region extending forward from the front end edge of the low-basis weight portion 33. In the modification, the front high rigidity portion 73 may be formed continuously in the width direction like the rear high rigidity portion.

The absorbent core 31 may have a pair of deformation base portions 85 provided behind the inseam extension / contraction portion 41. The deformation base point portion 85 extends rearward and outward in the width direction W behind the inseam extension / contraction portion 41, and is arranged in a pair at intervals in the width direction W. The deformation base point portion 85 is a base point at which the absorbing core 31 is deformed in the thickness direction T. The deformation base point portion 85 of the present embodiment is configured by the outer portion 72S of the rear high rigidity portion 72. The deformation base portion 85 has a base edge 85E that is an edge of the deformation base point. The base edge is an edge on which a polygonal line having the thickness of the absorbent core 31 is formed. The base edge 85E of the present embodiment is the outer edge 72E of the rear high rigidity portion 72. The deformed base portion 85 of the present embodiment includes a region extending from the base edge 85E to the thickness of the absorbent core 31 inward in a direction perpendicular to a line along the base edge 85E.

Here, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is an outer edge in the width direction W. Further, the inner portion is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W. In addition, the deformation | transformation base part 85 should just be a base point from which the absorption core 31 deform | transforms in a thickness direction, and is not limited to the outer part of the highly rigid part by a pressing part.

(4) Wearing state of disposable diaper Next, a wearing state of the disposable diaper 10 will be described based on FIGS. 6 to 8. FIG. 6 is a diagram schematically showing a wearing state of the disposable diaper in a section AA. FIG. 7 is a view for explaining a modification of the absorbent body 30 when the disposable diaper is mounted on the BB section. Drawing 8 is a figure showing typically the wearing state of the disposable diaper concerning an embodiment, and was the figure which looked at the wearer of the sleeping state from the front side. A line BL shown in FIG. 6 indicates a line of the body of the wearer.

When the disposable diaper is worn, the absorbent core 31 of the crotch region S3 is subjected to a force directed toward the skin surface side T1 and the inside in the width direction W by being pulled up or worn by a wearer's leg, The absorbent core 31 of the crotch region S3 is deformed at the base point of the low basis weight portion extending in the front-rear direction L when worn. The absorbent core is deformed in the thickness direction and easily fits in the wearer's crotch. At this time, since the rear high rigidity portion 72 and the front high rigidity portion 73 are provided so as to straddle the inner extension line 33IL and the outer extension line 33EL, deformation by the low basis weight portion 33 is performed as shown in FIG. It can be divided by the rear high rigidity portion 72 and the front high rigidity portion 73. It is possible to suppress the formation of the deformation base point by the low basis weight portion 33 over the entire area in the front-rear direction L of the absorbent core 31, and to suppress the occurrence of the gap between the buttocks and the disposable diaper and the gap between the abdomen and the disposable diaper. . Therefore, while deforming the absorbent core so as to be along the crotch of the body, the absorbent core can be made to follow the buttocks and abdomen of the wearer, and leakage can be suppressed. In addition, the low basis weight portion 33, which is a deformation base point of the absorbent core 31, has a lower basis weight than the surrounding area, and can suppress the thickness even after absorbing body fluid, and can maintain a deformed state.

In the present embodiment, the rear high rigidity portion 72 and the front high rigidity portion 73 that straddle the inner extension line 33IL and the outer extension line 33EL are provided. May extend over the inner extension line 33IL and the outer extension line 33EL. Either the rear high rigidity portion 72 or the front high rigidity portion 73 can reduce a gap to the abdomen or a gap to the buttocks, and suppress leakage.

The rear high rigidity portion 72 may have a rear high rigidity side edge 72X intersecting with at least one of the outer extension line 33EL and the inner extension line 33IL. The rear high-rigidity side edge 72X of the present embodiment is the outer edge 72E of the rear high-rigidity portion 72, and also forms the base edge 85E of the deformation base point. The side edge extension line 72EL extending along the rear high rigidity side edge 72X may intersect the outer edge 31E of the absorbent core 31. In addition, the front high rigidity portion 73 may have a front high rigidity side edge 73X that intersects at least one of the outer extension line 33EL and the inner extension line 33IL. The side edge extension line 73EL extending along the front high rigidity side edge 73X may intersect with the outer edge 31E of the absorbent core 31.

変形 The deformation of the absorbent core 31 based on the low basis weight portion 33 extends along the outer extension line 33EL or the inner extension line 33IL, and easily reaches the rear high rigidity side edge 72X. The deformation reaching the rear high rigidity side edge 72X extends along the rear high rigidity side edge 72X and the side edge extension line 73EL. Since the side edge extension line 73EL crosses the outer edge 31E of the absorbent core 31, deformation from the crotch region S3 side is easily guided to the outer edge 31E of the absorbent core 31. The effect of dividing the deformation due to the low basis weight portion 33 by the front high rigidity portion 73 and the rear high rigidity portion 72 is more easily obtained. In addition, in the region on the front side of the front high rigidity portion 73 and the region on the rear side of the rear high rigidity portion 72, the influence of deformation due to the low basis weight portion is reduced, and it is easier to secure the fit to the buttocks and abdomen. Become.

交 The intersection of the side edge extension line and the outer edge 31E of the absorbent core 31 may be located outside the high rigidity side edge in the front-rear direction L. Specifically, the intersection P1 between the side edge extension line 72EL and the outer edge 31E of the absorbent core 31 is located behind the rear high rigidity side edge 72X, and the side edge extension line 73EL and the outer edge of the absorbent core 31 are located. The intersection P2 with 31E may be located on the front side of the front high rigidity side edge 73X. According to such a configuration, the deformation by the low basis weight portion 33 can be guided to a position away from the crotch. Therefore, the absorbent core 31 can be more easily fitted along at least one of the buttocks and the abdomen of the wearer while deforming the absorbent core 31 along the crotch of the body.

The rear high rigidity side edge 72X and the front high rigidity side edge 73X may be inclined with respect to the width direction W. In comparison with the configuration in which the rear high rigidity side edge 72X and the front high rigidity side edge 73X are parallel to the width direction W, the deformation that has reached the rear high rigidity side edge 72X and the front high rigidity side edge 73X is gradual. It is guided to the outer edge 31E. When the absorbent core 31 is gently deformed, the formation of unintended irregularities on the absorbent core 31 is suppressed, and the absorbent core 31 is more easily fitted to the body.

交 The intersection P1 between the outer edge extension line 72EL of the rear high rigidity portion 72 and the outer edge 31E of the absorbent core 31 may be arranged outside the narrow portion 35 in the front-rear direction L. Further, the intersection P2 between the side edge extension line 73EL of the front high rigidity portion 73 and the outer edge of the absorbent core 31 may be arranged outside the narrow portion 35 in the front-rear direction L. The deformation due to the low basis weight portion 33 can be easily led to the wide portion. The wide part is farther from the leg than the narrow part 35 and is less deformed by the movement of the leg. Therefore, even when the leg moves sharply, the shape of the absorbent core 31 is easily maintained, the length of the absorbent core 31 in the width direction W is secured, and the deformation due to the low basis weight portion 33 can be absorbed. Therefore, even when the base point of deformation along the groin of the wearer is formed on the absorbent core by the movement of the leg, the deformation along the groin and the deformation by the low basis weight part 33 are suppressed from interlocking. Thus, the length in the width direction of the absorbent core 31 can be secured. Therefore, the buttocks and abdomen can be covered with the absorbent core, and leakage can be further suppressed.

距離 The distance L1 in the front-rear direction L between the rear high rigidity portion 72 and the low basis weight portion 33 may be 15 mm or more and 30 mm or less. The distance L2 in the front-rear direction L between the front high rigidity portion 73 and the low basis weight portion 33 may be 15 mm or more and 30 mm or less. Since the distance L1 and the distance L2 are 15 mm or more, the deformation of the absorbent core 31 due to the low basis weight portion 33 does not directly reach the rear high rigidity portion 72 and the front high rigidity portion 73, and the deformation is weakened. Easy to reach. Therefore, the effect of dividing the deformation of the absorbent core 31 by the rear high rigidity portion 72 and the front high rigidity portion 73 is more easily obtained. Further, since the distance L1 and the distance L2 are equal to or less than 30 mm, the region where the deformation of the low-basis weight portion 33 propagates in the front-rear direction L can be reduced, and the absorbent core 31 can be arranged so as to cover the body over a wide range.

The length of the front high rigidity portion 72 in the front-rear direction L may be longer than the length of the front high rigidity portion 73 in the front-rear direction L. Since the length of the rear high rigidity portion 72 in the front-rear direction L is long, deformation of the region with respect to the buttocks is suppressed, and it is easy to secure a stool accommodation space. On the other hand, the front high rigidity portion 73 has an effect of dividing the deformation of the low basis weight portion 33. The length of the front high rigidity portion 73 in the front-rear direction L is relatively short, and it is easy to secure the area of the absorbent core that covers the front waistline region S1.

The center of the low basis weight portion 33 in the front-rear direction L is disposed behind the center 10LC of the disposable diaper 10 in the front-rear direction L, and the center of the rear high rigidity portion 72 and the low basis weight portion 33 in the front-rear direction L. The distance L1 may be shorter than the distance L2 in the front-rear direction L between the front high rigidity portion 73 and the low basis weight portion 33. Since the low basis weight portion 33 is biased to the rear side, a deformation based on the low basis weight portion 33 can be provided on the buttocks side. Further, since the distance L1 in the front-rear direction L between the rear high rigidity portion 72 and the low basis weight portion 33 is relatively short, the deformation of the absorbent core 31 based on the rear high rigidity portion 72 and the absorption by the low basis weight portion 33. The deformation of the core 31 is easily linked. Therefore, the buttocks can be easily covered by the absorbent core deformed so as to be closer to the body side in the crotch region, and the back side can be widely covered along the shape of the buttocks. On the other hand, the distance L2 in the front-rear direction L between the front high rigidity portion 73 and the low basis weight portion 33 is relatively long, and it is easy to reach the front high rigidity portion 73 by weakening the deformation due to the low basis weight portion 33. The effect that the deformation by the low basis weight part 33 can be divided by the front high rigidity part 73 is more easily obtained.

In addition, when the tape-type disposable diaper 10 is worn, first, the buttocks of the wearer are placed on the rear waist region S2 of the disposable diaper 10 in a state where the disposable diaper 10 is deployed. Then, the disposable diaper 10 is passed between the legs of the wearer, the diaper is pulled toward the crotch region, and the body is covered with the crotch region. At this time, the disposable diaper is pulled in the front-rear direction L, and the absorbent core 31 is easily deformed around the deformation base portion 85 including the rear high-rigidity portion 72. The deformation base point portion 85 is provided on the rear side of the crotch elastic portion 41 and the low basis weight portion 33, and the deformation base point of the absorbent core 31 is formed behind the crotch elastic portion 41 and the low basis weight portion 33. You. The deformation base point portion 85 extends rearward and outward in the width direction W, and a deformation base point extending inward in the width direction W from the rear waistline region toward the crotch region is formed in the absorbent core 31. You.

Therefore, when the buttocks are placed on the rear waist area and the diaper is pulled toward the crotch area, the absorber is deformed by the base point extending inward in the width direction W from the rear waist area to the crotch area. Specifically, as shown in FIG. 7, the absorber in the area where the deformation base portion 85 is provided is deformed with the outer edge 72E of the rear high rigidity portion 72 (the base edge 85E of the deformation base portion 85) as a base point. The area inside the outer edge 72E in the width direction W is arranged closer to the skin surface than the area outside the outer edge 72E in the width direction W. The reason why the region inside the width direction W with respect to the outer edge 72E is arranged closer to the skin surface than the region outside the width direction W with respect to the outer edge 72E is as follows. The center in the width direction W is pulled up to the body side, the wearer generally applies a force to the center in the width direction W of the absorbent core 31 when pulling the diaper, and the outer portion ( This is because the center of the absorbent core 31 in the width direction W is pulled up in a state in which the legs (for example, the vicinity of the leg opening) are hooked on the legs. The absorbent core 31 is deformed such that the length in the width direction W becomes shorter toward the crotch region side by being deformed around the deformed base portion 85 as a base point. At this time, since the length of the rear high rigidity portion 72 in the front-rear direction L is relatively long, the absorbent core 31 can be smoothly folded, an unintended fold is formed, and the generation of a gap in the body can be suppressed. .

As shown in FIGS. 6 and 8, the absorbent core 31 located on the front side of the deformation base portion 85 is deformed in a convex shape toward the body side by the contraction of the pair of crotch elastic portions 41, and the central region R32 becomes the side region R31. Stand up against. Therefore, the absorbent core 31 in the crotch region is arranged along the body side, and the absorbent core 31 can be properly accommodated in the wearer's crotch.

つつ While covering the absorbent core 31 with a large area over the buttocks of the wearer, the absorbent core 31 can be compactly stored in the gap between the wearer's feet. By arranging the disposable diaper at an appropriate position between the crotch of the wearer, the front waistline region can be pulled to a position covering the abdomen of the wearer. In a tape-type disposable diaper, a wearer's body can be covered appropriately.

At least the rear high rigidity side edge 72X of the front high rigidity side edge 73X and the rear high rigidity side edge 72X may extend inward in the width direction toward the inside in the front-rear direction L, and may extend in the width direction of the front high rigidity side edge 73X. May be smaller than the angle of the rear high rigidity side edge 72X with respect to the width direction. Since the angle of the rear high rigidity side edge 72X with respect to the width direction is relatively large, the absorbent core can be deformed such that the length of the absorbent core in the width direction is reduced within a short range in the front-rear direction L.

On the other hand, the front waistline region is a region where the rear waistline region and the inseam region are applied to the body at the time of wearing, and finally applied. Therefore, it is preferable to arrange the front waistline region so as to cover the body in a flat state without providing a deformation base point at the time of wearing. Since the angle of the front high rigidity side edge 73X with respect to the width direction is relatively small, the deformation due to the low basis weight portion 33 can be gently separated, and the body can be covered by the flat front waist region.

外側 The outer edge of the crotch elastic portion 41 may be arranged outside the outer edge of the deformation base portion 85 in the width direction W. However, more preferably, the outer edge of the crotch expanding / contracting portion 41 may be disposed inside the outer edge of the deformation base portion 85 in the width direction W. According to such a configuration, the deformation of the absorbent core 31 based on the deformation base point portion 85 and the deformation of the absorbent core 31 by the crotch elastic portion 41 are more easily linked. Therefore, the absorbent core 31 deformed so that the length in the width direction W becomes shorter from the rear waist region toward the crotch region becomes easier to dispose closer to the body side in the crotch region. The outer edge of the crotch elastic portion 41 is the outer edge of the elastic member located most outside in the width direction W among the elastic members constituting the crotch elastic portion 41. The rubber thread constituting the crotch elastic portion 41 of the present embodiment is disposed along the front-rear direction L, and an elastic member located outside in the width direction W forms an outer edge of the crotch elastic portion 41.

The deformation base portion 85 and the crotch elastic portion 41 may be shifted in the width direction W. However, more preferably, at least a part of the deformation base portion 85 may be arranged on an extension line extending rearward from the rear end edge of the crotch elastic portion 41. The deformation of the absorbent core 31 based on the deformation base portion 85 and the deformation of the absorbent core 31 by the crotch elastic portion 41 are more easily linked. Therefore, the absorbent core 31 deformed so that the length in the width direction W becomes shorter from the rear waist region toward the crotch region becomes easier to dispose closer to the body side in the crotch region. In the case where a plurality of elastic members constituting the crotch expanding / contracting portion 41 are provided, the deformation base point portion 85 may be arranged on at least an extension of any one of the elastic members.

The deformation base point portion 85 may extend in the front-rear direction L over a first intermediate line ML1 located in the middle of the front-end edge of the engaging portion 93 between the center 10LC in the front-rear direction L of the disposable diaper. As shown in FIG. 1, the first intermediate line ML 1 is a line that passes through the center in the front-rear direction L of the center 10 LC in the front-rear direction L of the disposable diaper and the front edge of the engaging portion 93 and extends in the width direction W. . The area behind the first intermediate line ML1 is an area where the buttocks are generally placed at the time of wearing. The deformation base point portion 85 straddles the first middle line ML1 in the front-rear direction L, and is arranged from a region where the buttocks of the wearer is placed to a region where the buttocks are not placed. At the time of mounting, in a state where the area behind the first middle line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled forward, and the absorbent core 31 is further deformed with the deformation base point 85 as the base point. easy. Therefore, the absorbent core 31 is deformed so that the width of the absorbent core 31 is shortened, the disposable diaper is disposed at an appropriate position between the wearers' crotches, and the wearer's body can be appropriately covered.

Furthermore, the rear edge 41R of the crotch elastic portion 41 may be arranged on the front side of the first intermediate line ML1. The rear edge 41R of the inseam extension / contraction portion 41 is arranged in a region where the buttocks of the wearer are not placed. At the time of mounting, in a state where the area behind the first middle line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled forward, and the crotch elastic portion 41 is more easily extended. Therefore, the region where the crotch elastic portion 41 is arranged is more easily pulled up with respect to the body, and the absorbent core 31 can be properly accommodated in the wearer's crotch.

The front end edge of the deformation base portion 85 may be disposed on the front side of the second intermediate line ML2 located in the middle in the front-rear direction L between the rear end edge of the deformation base portion 85 and the rear end edge of the crotch extension portion 41. As shown in FIG. 1, the second intermediate line ML 2 is a line that passes through the middle of the rear end edge of the deformation base portion 85 and the rear end edge 41 R of the crotch elastic portion 41 in the front-rear direction L and extends in the width direction W. is there. Of the region between the rear end edge of the deformed base portion 85 and the rear end edge of the crotch elastic portion 41, the deformed base portion 85 is provided over half or more of the region. Therefore, the deformation of the absorbent core 31 based on the deformation base point portion 85 and the deformation of the absorbent core 31 by the inseam extension / contraction portion 41 are easily linked. Therefore, the absorbent core 31 can be easily deformed into a shape along the body from the rear waistline region S2 to the crotch region S3, and the absorbent core 31 can be compactly arranged in the crotch region while covering the buttocks. The disposable diaper can be arranged at an appropriate position between the wearer's crotches, and can appropriately cover the wearer's body.

高 A high-rigidity portion having a higher rigidity than the deformation base point 85 in a region outside the width direction W may be provided between the pair of deformation base points 85. In the present embodiment, the outer portion of the rear high-rigidity portion 72 forms the deformation base point 85, and the region between the outer portions of the rear high-rigidity portion 72 forms the high-rigidity portion of the present configuration. Since the high-rigidity portion is provided between the deformation base portions 85, a rigidity difference occurs between a region outside the deformation base portion 85 in the width direction W and a region inside the deformation base portion 85. With the base point 85, the absorbent core 31 is more easily deformed. Therefore, the absorbent core 31 is easily deformed so that the length in the width direction W becomes shorter toward the crotch region side, and the absorbent core 31 is more easily accommodated in the wearer's crotch. By disposing the disposable diaper at an appropriate position between the wearer's crotches, the wearer's body can be appropriately covered. Note that in the deformation base portion having relatively low rigidity, 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 portions 85 may be adjacent to the deformation base portion 85 in the width direction W. A region outside the deformation base portion 85 in the width direction W is more easily deformed than a region between the deformation base portions 85, and the absorption core 31 is more easily deformed due to a difference in rigidity. Further, 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 and easily deformed in a convex shape toward the wearer, so that the absorbent core 31 can be more easily accommodated in the crotch of the wearer.

変形 The deformed base portion 85 and the high-rigidity portion between the deformed base portions 85 in the present embodiment are both constituted by the rear high-rigidity portion 72 formed of a compressed portion. As described above, the deformation base portion 85 and the high-rigidity portion may be formed integrally, and the boundary between the deformation base portion 85 and the high-rigidity portion may not be formed. The entire rear high rigidity portion 72 may exhibit the function as the deformation base portion 85 and the function as the high rigidity portion. In addition, the deformation base portion 85 formed of the compressed portion has a high rigidity, and the deformation of the absorbent core 31 is more easily stabilized.

The pair of deformed base portions 85 are arranged so as to sandwich the center of the disposable diaper in the width direction W, and at least a part of the deformed base portion 85 is formed of the center of the absorbent core 31 in the width direction W and the maximum width of the absorbent core 31. May be arranged outside the third middle line ML3 located in the middle in the width direction W. As shown in FIG. 1, the third intermediate line ML 3 is a line passing through the center between the width direction W of the absorbent core 31 and the center of the maximum width of the absorbent core 31 and extending in the front-rear direction L. In a region equal to or more than half of the width direction W of the absorbing core 31, the absorbing core 31 is easily deformed with the deformation base portion 85 as a base point. The absorbent core 31 is easily deformed such that the length in the width direction W is reduced toward the crotch region side in a wide range of the absorbent core 31, and the absorbent core 31 is more easily fit in the wearer's crotch.

脚 The leg elastic portion 42 may be arranged on the extension line EL2 extending outward from the deformation base portion 85 in the width direction W. The extension line EL2 is a line extending outward from the arbitrary position of the deformation base portion 85 in the width direction W, and a plurality of the extension lines EL2 are provided at different positions in the front-rear direction L. It suffices that at least a part of the leg-surrounding elastic portion 42 is arranged on any one of the extension lines EL2. When the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks and the region outside the absorbent core 31 in the width direction W is in close contact with the legs. Since the absorbent core 31 is deformed in a state in which the leg elastics and the buttocks are fitted to the body, the central region R32 is more easily raised with respect to the side region R31 on the front side than the buttocks, and the absorbent core 31 It becomes easier to deform as a base point.

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

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

有し A side flap portion 27 extending outward in the width direction W toward the rear side outside the absorption core 31 in the width direction W, and the side flap portion 27 may be disposed on the extension line EL2. The side flap portion 27 is a portion that extends rearward and outward in the width direction W in the outer portion of the disposable diaper, and is a hatched portion in FIG. When the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks, and the side flaps outside the absorbent core 31 in the width direction W more easily hit the legs. Accordingly, the absorbent core 31 is deformed in a state where the side flap portion located outside in the width direction W and the region where the buttocks are placed are pressed, and is more easily deformed with the deformation base point portion 85 as a base point.

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

低 The low basis weight portion 33 may be arranged in a region overlapping the crotch elastic portion 41. When worn, the absorbent core 31 deforms based on the low basis weight portion 33 extending in the front-rear direction L when worn. Therefore, the absorption core 31 is easily deformed due to the contraction of the crotch expansion / contraction portion 41 toward the body side due to the convex shape, and the absorption core 31 can be properly accommodated in the wearer's crotch.

(5) Modified Example Next, an absorbent core according to a modified example will be described. FIG. 9 is a diagram schematically showing a plane of an absorbent core 31 having a high rigidity portion according to a modification. In the following description of the modified example, only the configuration different from the above-described embodiment will be described, and the description of the same configuration as the embodiment will be omitted using the same reference numerals.

FIG. 9A shows an absorbent core 31A having a rear high-rigidity portion 72A according to the first modification. The rear high-rigidity portions 72A are arranged as a pair at both sides of the center 10WC in the width direction of the disposable diaper with an interval in the width direction W. The rear high-rigidity portions 72A are not continuous in the width direction but are separated in the width direction, and the region between the rear high-rigidity portions 72A makes it easy to secure body fluid absorption performance. In addition, in the form in which the compressed portion is formed in the rear high rigidity portion 72A, the compressed portion is not formed in a region between the rear high rigidity portions 72A. Therefore, the absorbent core 31 can easily maintain softness without becoming too hard. The intersection P1 between the side edge extension line 73EL and the outer edge 31E of the absorbent core 31 may be disposed in the narrow portion 35. The deformation due to the low basis weight part 33 is guided to the narrow part 35, and the deformation in the wide part which is the region of the maximum width of the absorbent core 31 can be suppressed. The wide part can cover the buttocks and abdomen, and can further suppress leakage.

FIG. 9B shows an absorbent core 31B having a rear high rigidity portion 72B and a low basis weight portion 33B according to Modification 2. The low basis weight portion 33B is curved not along the front-back direction L. The inner extension line 33IL of the low basis weight portion 33 is a line extending along the front-rear direction L from an end edge of the inner edge extending in the front-rear direction L in the front-rear direction L. Similarly, the outer extension line 33EL is a line extending along the front-rear direction L from an end edge of the outer edge extending in the front-rear direction L in the front-rear direction L. The rear high rigidity side edge 72X of the rear high rigidity portion 72B extends along the width direction W.

FIG. 9C shows an absorbent core 31C having a rear high-rigidity portion 72C according to the third modification. The rear high rigidity side edge 72X of the rear high rigidity portion 72C extends inward in the front-rear direction L toward the outside in the width direction. Therefore, the intersection P1 between the side edge extension line 72EL and the outer edge 31E of the absorbent core 31 is located on the inner side in the front-rear direction L than the high rigidity side edge 72X.

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

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

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

Note that the entire contents of Japanese Patent Application No. 2018-152782 filed on August 14, 2018 are incorporated herein by reference.

According to the present invention, it is possible to provide a disposable diaper in which the absorbent core is arranged along a part other than the crotch of the wearer while deforming the absorbent core so as to be along the crotch of the body and leakage can be suppressed.

10 disposable diaper, 10LC center of the diaper in the front-rear direction, 10WC center of the diaper in the width direction, 21 top sheet, 22 side sheet, 23 back sheet, 24 exterior sheet, 27 side flap portion, 30 absorber, 31 absorbent core, 32 Core wrap, 33 low basis weight part, 33 IL 線 inner extension, 33 EL outer extension, 35 narrow part, 41 inseam elastic part, 42 leg elastic part, 43 漏 leakproof elastic part, 45 waist elastic part, 51 indicator, 71 Central high rigidity part (high rigidity part), 72 部 rear high rigidity part (high rigidity part), 72EL side edge extension line, 73 front high rigidity part (high rigidity part), 73EL side edge extension line, 85 deformation base point part, 91 Fastening tape, 92 base, 93 engagement, 95 target, ML1 1st intermediate line, ML2 2 middle line, ML3 third intermediate line, S1 front waist region, waistline region after S2, S3 crotch region, T the thickness direction, T1 skin face side, T2 non-skin side, L longitudinal direction, W the width direction

Claims

A front-rear direction and a width direction orthogonal to each other,
Front waist area, rear waist area, and crotch area disposed between the front waist area and the rear waist area,
And at least an absorbent core arranged in the crotch region,
The absorbent core of the crotch region is a disposable diaper formed with a pair of low-basis weight portions extending in the front-rear direction and arranged at intervals in the width direction,
The absorbent core is provided with a high-rigidity portion having higher rigidity than the surrounding area,
The high rigidity portion includes an inner extension line extending in the front-rear direction from the front-rear direction edge at the inner edge of the low basis weight portion, and the front-rear direction from the front-rear direction edge at the outer edge of the low basis weight portion. A disposable diaper that straddles the outer extension line that extends in the direction.
The high-rigidity portion has a high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line,
The disposable diaper according to claim 1, wherein a side edge extension line extending along the rigid side edge intersects an outer edge of the absorbent core.
The disposable diaper according to claim 2, wherein the intersection of the extended side edge and the outer edge of the absorbent core is located outside the highly rigid side edge in the front-rear direction.
The absorbent core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorbent core,
4. The disposable diaper according to claim 2, wherein an intersection of the side edge extension line and an outer edge of the absorbent core is disposed in the narrow portion. 5.
The absorbent core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorbent core,
4. The disposable diaper according to claim 2, wherein an intersection of the side edge extension line and an outer edge of the absorbent core is disposed outside the narrow portion in the front-rear direction. 5.
The disposable diaper according to any one of claims 1 to 5, wherein a distance between the high rigidity portion and the low basis weight portion in the front-rear direction is 15 mm or more and 30 mm or less.
The high rigidity portion includes a front high rigidity portion disposed on the front side of the low basis weight portion, and a rear high rigidity portion disposed on the rear side of the low basis weight portion. The disposable diaper according to claim 6.
The disposable diaper according to claim 7, wherein the length of the rear high rigidity portion in the front-rear direction is longer than the length of the front high rigidity portion in the front-rear direction.
The center of the low basis weight portion in the front-rear direction is disposed rearward of the center of the disposable diaper in the front-rear direction, and the distance between the rear high rigidity portion and the low basis weight portion in the front-rear direction. The disposable diaper according to claim 7 or 8, wherein a distance between the front high rigidity portion and the low basis weight portion in the front-rear direction is shorter.
Having a fastening tape arranged in the rear waist area,
The front high rigidity portion has a front high rigidity side edge crossing at least one of the outer extension line and the inner extension line,
The rear high-rigidity portion has a rear high-rigidity side edge that intersects at least one of the outer extension line and the inner extension line,
At least the rear high rigidity side edge of the front high rigidity side edge and the rear high rigidity side edge extends inward in the width direction toward the inside in the front-rear direction,
The disposable diaper according to any one of claims 7 to 9, wherein an angle of the front high rigidity side edge with respect to the width direction is smaller than an angle of the rear high rigidity side edge with respect to the width direction.