CN112566600B

CN112566600B - Disposable diaper having a disposable diaper core

Info

Publication number: CN112566600B
Application number: CN201980053000.9A
Authority: CN
Inventors: 高桥真衣香; 坂口智; 山中康弘; 市原拓巳
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-08-14
Filing date: 2019-08-13
Publication date: 2022-06-14
Anticipated expiration: 2039-08-13
Also published as: JP2020025790A; WO2020036164A1; CN112566600A; JP7097260B2

Abstract

A disposable diaper capable of suppressing leakage by deforming an absorbent core so as to fit along the crotch of the body and also by arranging the absorbent core along a portion other than the crotch of the wearer. A disposable diaper (10) has an absorbent core (31) disposed at least in the crotch region (S3). The absorbent core in the crotch region is formed with a pair of low-basis-weight sections (33), and the low-basis-weight sections (33) extend in the front-back direction and are arranged at intervals in the width direction. The absorbent core is provided with a high rigidity portion including a rear high rigidity portion (72) having higher rigidity than the surrounding region and a front high rigidity portion (73). The high rigidity portion spans an inner extension line (33IL) extending in the front-rear direction from an end edge in the front-rear direction of the inner edge of the low basis weight portion and an outer extension line (33EL) 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.

Description

Disposable diaper having a disposable diaper

Technical Field

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

Background

A disposable diaper having a pair of groove-like portions extending in the front-rear direction in a crotch region is known (see, for example, patent document 1). The groove-like portion serves as a deformation base point of the absorbent core. The absorbent core of the disposable diaper configured as described above deforms in the thickness direction with the groove-like portions extending in the front-rear direction as starting points when put on (see, for example, fig. 4 of patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-473

Disclosure of Invention

However, the above-described disposable diaper has the following problems.

The groove-like portion is a portion obtained by compressing the absorbent core in the thickness direction. Therefore, when the body fluid is absorbed, the groove-like portions bulge, and the deformed state of the absorbent core may not be maintained.

Further, the disposable diaper is worn so as to cover the abdomen from the buttocks of the wearer. In the disposable diaper of patent document 1, the groove-like portion extends in the front-rear direction, and the deformation using the groove-like portion as a base point is also formed to extend in the front-rear direction. However, the shape of the body to which the disposable diaper is applied is narrowest in the crotch region, and bulges outward in the width direction from the crotch region toward the buttocks. Therefore, if deformation of the absorbent core that is fitted between the wearer's thighs is also involved in the rear waistline region and the front waistline region, the disposable diaper may not fit the buttocks and abdomen, a gap may be formed between the body and the disposable diaper, and leakage may occur.

Accordingly, a disposable diaper is desired which can deform the absorbent core so as to fit along the crotch of the body and which can prevent leakage by arranging the absorbent core along a portion other than the crotch of the wearer.

A disposable diaper according to one aspect comprises: a front-back direction and a width direction orthogonal to each other; a front torso-surrounding region, a rear torso-surrounding region, and a crotch region disposed between the front torso-surrounding region and the rear torso-surrounding region; and an absorbent core disposed at least in the crotch region, wherein the absorbent core in the crotch region is formed with a pair of low basis weight portions extending in the front-rear direction and disposed with a space therebetween in the width direction, wherein the absorbent core is provided with a high rigidity portion having higher rigidity than that of the surrounding region, the high rigidity portion straddles an inner extension line extending in the front-rear direction from an end edge of an inner edge of the low basis weight portion in the front-rear direction, and an outer extension line extending in the front-rear direction from an end edge of an outer edge of the low basis weight portion in the front-rear direction.

Drawings

Fig. 1 is a plan view of a disposable diaper according to an embodiment, as viewed from the skin surface side.

Fig. 2 is a top view of an absorbent core of an embodiment.

Fig. 3 is a schematic sectional view of the disposable diaper shown in fig. 1 taken along the section a-a.

Fig. 4 is a schematic sectional view of the disposable diaper shown in fig. 1 taken along the section B-B.

Fig. 5 is a schematic sectional view of the disposable diaper shown in fig. 1, taken along the C-C section.

Fig. 6 is a view schematically showing a worn state of a disposable diaper at a section a-a.

FIG. 7 is a view for explaining a modified form of the absorber at a B-B section of the disposable diaper.

Fig. 8 is a view schematically showing a worn state of the disposable diaper according to the embodiment.

Fig. 9 is a view showing an absorbent core having deformation base point portions according to a modification example.

Detailed Description

(1) Brief description of the embodiments

At least the following matters will be made clear by the description of the present specification and the accompanying drawings.

A disposable diaper of one embodiment comprises: a front-back direction and a width direction orthogonal to each other; a front torso-surrounding region, a rear torso-surrounding region, and a crotch region disposed between the front torso-surrounding region and the rear torso-surrounding region; and an absorbent core disposed at least in the crotch region, wherein the absorbent core in the crotch region is formed with a pair of low basis weight portions extending in the front-rear direction and disposed with a space therebetween in the width direction, wherein the absorbent core is provided with a high rigidity portion having higher rigidity than that of the surrounding region, the high rigidity portion straddles an inner extension line extending in the front-rear direction from an end edge of an inner edge of the low basis weight portion in the front-rear direction, and an outer extension line extending in the front-rear direction from an end edge of an outer edge of the low basis weight portion in the front-rear direction.

In this configuration, the absorbent core in the crotch region deforms from the low basis weight portion extending in the front-rear direction when worn, and the absorbent core deforms in the thickness direction, and is easily accommodated in the crotch of the wearer. Since the high rigidity portion is provided across the inner extension line and the outer extension line, the deformation of the low basis weight portion can be cut by the high rigidity portion. The formation of the deformation origin point by the low basis weight portion can be suppressed over the entire longitudinal direction of the absorbent core, and the occurrence of a gap between the disposable diaper and at least one of the buttocks and the abdomen can be suppressed. This allows the absorbent core to be deformed so as to fit along the crotch of the body, and allows the absorbent core to fit along at least one of the buttocks and the abdomen of the wearer, thereby suppressing leakage. In addition, the low basis weight portion serving as the deformation origin of the absorbent core has a lower basis weight than the surrounding region, and can be kept in a deformed state while suppressing the thickness even after the absorption of body fluid.

According to a preferred aspect, the high rigidity portion may have a high rigidity side edge intersecting at least one of the outer extension line and the inner extension line, and a side edge extension line extending along the high rigidity side edge may intersect the outer edge of the absorbent core. In this form, the deformation of the absorbent core 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. Further, 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 lines intersect with 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 blocking the deformation caused by the low unit area weight portion by the front high rigidity portion and the rear high rigidity portion is more easily obtained. In addition, in the region forward of the front high rigidity portion and the region rearward of the rear high rigidity portion, the influence of deformation due to the low basis weight portion is reduced, and the fit to the buttocks and the abdomen is more easily ensured.

According to a preferred aspect, an intersection of the side edge extension line and the outer edge of the absorbent core may be located outward in the front-rear direction from the high-rigidity side edge. With this configuration, the deformation of the low basis weight portion can be guided to a position away from the crotch portion. This allows the absorbent core to be deformed so as to fit along the crotch portion of the body, and makes it easier to fit the absorbent core along at least one of the buttocks and the abdomen of the wearer.

According to a preferred aspect, the absorbent core may have a narrow portion whose length in the width direction is shorter than the maximum width of the absorbent core, and an intersection of the side edge extension line and the outer edge of the absorbent core may be disposed in the narrow portion. With this configuration, the deformation of the low basis weight portion can be guided to the narrower portion, and the deformation of the absorbent core in the region of the maximum width can be suppressed. The hip and abdomen can be covered with the area of the maximum width of the absorbent core, and leakage can be suppressed.

According to a preferred aspect, the absorbent core may have a narrow portion whose length in the width direction is shorter than the maximum width of the absorbent core, and an intersection of the side edge extension line and the outer edge of the absorbent core may be disposed further outward in the front-rear direction than the narrow portion. With this configuration, the deformation of the low basis weight portion can be easily guided to the region outside the narrow portion in the front-rear direction. At a position farther from the leg than the narrow portion, deformation caused by the movement of the leg is small. Therefore, even when the legs are strongly moved, the absorbent core is less likely to be deformed, and the length of the absorbent core in the width direction is ensured, so that the deformation caused by the low basis weight portion can be absorbed. Therefore, even when the deformation origin points along the groin portions of the wearer are formed in the absorbent core by the movement of the legs, the deformation along the groin portions is suppressed from being interlocked with the deformation caused by the low basis weight portions, and the length in the width direction of the absorbent core can be ensured. This enables the buttocks and abdomen to be covered with the absorbent core, and leakage to be further suppressed.

According to a preferred aspect, the distance in the front-rear direction between the high rigidity portion and the low basis weight portion may be 15mm to 30 mm. In this aspect, by setting the distance in the front-rear direction between the high rigidity portion and the low basis weight portion to 15mm or more, the deformation of the absorbent core caused by the low basis weight portion does not directly reach the high rigidity portion, and easily reaches the high rigidity portion in a state where the deformation is weakened. This makes it easier to obtain the effect of blocking the deformation of the absorbent core by the high rigidity portion. Further, by setting the distance in the front-rear direction between the high stiffness portion and the low basis weight portion to 30mm or less, the region in which the deformation of the low basis weight portion propagates in the front-rear direction is reduced, and the absorbent core can be arranged so as to cover the body over a wide range.

According to a preferred aspect, the high rigidity portion may have a front high rigidity portion disposed on a front side of the low basis weight portion and a rear high rigidity portion disposed on a rear side of the low basis weight portion. In this configuration, the deformation base point can be prevented from being formed by the low basis weight portion over the entire longitudinal direction of the absorbent core, and the occurrence of a gap between the disposable diaper and both the buttocks and the abdomen can be prevented. The absorbent core can be deformed so as to fit along the crotch of the body, and can fit along the buttocks and abdomen of the wearer to suppress leakage.

According to a preferred aspect, 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. In this aspect, since the rear high-rigidity portion has a long length in the front-rear direction, deformation of the region corresponding to the buttocks is suppressed, and a space for accommodating feces and urine is easily secured. On the other hand, the front high rigidity portion has an effect of cutting the deformation of the low unit area weight portion. The front high-rigidity portion has a relatively short length in the front-rear direction, and the area of the absorbent core covering the front waistline region is easily ensured.

According to a preferred aspect, the center in the front-rear direction of the low basis weight portion may be disposed more rearward than the center in the front-rear direction of the disposable diaper, and the distance in the front-rear direction between the rear high rigidity portion and the low basis weight portion may be shorter than the distance in the front-rear direction between the front high rigidity portion and the low basis weight portion. In this aspect, since the low basis weight portion is shifted to the rear side, the deformation using the low basis weight portion as a base point can be provided on the hip side. Further, since the distance in the front-rear direction between the rear high stiffness portion and the low basis weight portion is relatively short, the deformation of the absorbent core with the rear high stiffness portion as a base point is easily interlocked with the deformation of the absorbent core by the low basis weight portion. Thus, the buttocks can be easily covered with 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 in the front-rear direction between the front high rigidity portion and the low basis weight portion is relatively long, and the deformation of the low basis weight portion is easily reduced and reaches the front high rigidity portion. The effect of enabling the deformation caused by the low unit area weight portion to be cut by the front high rigidity portion is more easily obtained.

According to a preferred aspect, the disposable diaper may include a fastening tape disposed in the rear body region, the front high-rigidity portion may include a front high-rigidity side edge intersecting at least one of the outer extension line and the inner extension line, the rear high-rigidity portion may include a rear high-rigidity side edge intersecting 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 may extend inward in the width direction toward the inside in the front-rear direction, and an angle of the front high-rigidity side edge with respect to the width direction may be smaller than an angle of the rear high-rigidity side edge with respect to the width direction. In this mode, 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 of the absorbent core in the width direction is shortened in a short range in the front-rear direction. On the other hand, the front torso-surrounding region is a region that is finally hit against the body after the rear torso-surrounding region and the crotch region are hit against the body when worn. Therefore, it is preferable that the front skirt region is configured not to provide a deformation base point when worn, but to cover the body in a flat state. Since the angle of the front high-rigidity side edge with respect to the width direction is relatively small, the deformation of the low-basis-weight portion can be smoothly cut off, and the body can be covered with the front leg region in a flat state.

(2) Overall schematic structure of disposable diaper

Hereinafter, a disposable diaper according to an embodiment will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic drawings, and the ratio of the dimensions and the like are different from those in the actual case. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings may include portions having different dimensional relationships and ratios from each other.

The disposable diaper may be a tape-type disposable diaper or a pants-type disposable diaper. Fig. 1 is a plan view of a disposable diaper 10 according to the present embodiment as viewed from the skin surface side, and fig. 2 is a plan view of an absorbent core according to the embodiment as viewed from the skin surface side. Fig. 1 and 2 are plan views showing a disposable diaper in an extended state. Fig. 3 is a schematic sectional view of the disposable diaper shown in fig. 1 taken along the section a-a. Fig. 4 is a schematic sectional view of the disposable diaper shown in fig. 1 taken along the section B-B. Fig. 5 is a schematic sectional view of the disposable diaper shown in fig. 1, taken along the C-C section. The stretched state in the present invention means a state in which the disposable diaper 10 is stretched to a state in which no wrinkles are formed. In the present invention, the natural state is a state in which, in the case of the disposable diaper 10 contained in the package, the disposable diaper 10 is taken out of the package and left to stand in an environment of 20 ℃ ± 2 ℃ and a relative humidity of 60% ± 5% RH for 24 hours.

The disposable diaper 10 has a front-back 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 and the back side of the body. In other words, the front-back direction L is a direction extending in the front-back direction on the disposable diaper 10 after being unfolded. The disposable diaper 10 has a thickness direction T orthogonal to both the front-back direction L and the width direction W. The thickness direction T extends toward the skin surface side T1 on the wearer side and toward the non-skin surface side T2 on the side opposite to the skin surface side.

The disposable diaper 10 has a front body surrounding region S1, a rear body surrounding region S2, and a crotch region S3. The front waistline region S1 is a region opposed to the front waistline (abdomen) of the wearer. The rear torso-surrounding region S2 is a region opposed to the rear torso (back) of the wearer, and includes a region for supporting the body (buttocks) when worn. The crotch region S3 is a region located in the crotch of the wearer and disposed between the front torso-surrounding region S1 and the rear torso-surrounding region S2. The crotch region S3 is a region provided with leg hole openings arranged around the legs of the wearer. The leg hole openings are portions recessed inward in the width direction from the outer edge of the disposable diaper.

The disposable diaper 10 comprises an absorbent core 31, the absorbent core 31 comprising an absorbent material. The absorbent core 31 contains absorbent material such as comminuted pulp or superabsorbent polymers (SAP) or mixtures of these. As shown in fig. 3, the absorbent core 31 may be covered by a core wrap sheet 32. The absorbent body 30 can be constituted by the absorbent core 31 and the core wrap 32. The core wrap 32 may be made of a paper towel, and is disposed 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 fig. 1 and 3, the topsheet 21 and the side sheet 22 may be provided on the skin surface side T1 of the absorbent body 30 including the absorbent core 31. The topsheet 21 may be arranged across the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged to cover the outer side of the front sheet 21. The front sheet 21 and the side sheets 22 may be formed of liquid-permeable sheets such as nonwoven fabrics and apertured plastic films. The inner side portions of the side sheets 22 may be folded back to be overlapped. A leakage-preventing stretchable portion 43 stretchable in the front-rear direction L may be provided between the overlapped side sheets 22. The leakage preventing stretchable portion 43 may be formed of a rubber thread stretchable in the front-rear direction L. The side sheet 22 and the leakage preventing stretchable parts 43 constitute leakage preventing gathers 60 (see fig. 6) rising toward the skin surface side T1 when worn. The back sheet 23 and the outer sheet 24 may be provided on the non-skin surface side T2 of the absorbent body 30. The exterior sheet 24 may be provided on the non-skin surface side T2 of the back sheet 23. The length of the back sheet 23 in the width direction W may be shorter than the length of the exterior sheet 24 in the width direction W, and the length of the back sheet 23 in the front-rear direction L may be shorter than the length of the exterior sheet 24 in the front-rear direction L. The back sheet 23 may be formed of a liquid-impermeable film. The outer sheet 24 may be made of a liquid-permeable nonwoven fabric.

A fastening tape 91 is provided on the outer side of the rear body surrounding region. The fastening tape 91 has a base portion 92 and a joint 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 width direction W. The coupling portion 93 is disposed on the base portion 92 and coupled to a target portion 95 (see fig. 5). The target portions 95 are arranged in the width direction at intervals in the front body surrounding region S1, and are configured to be fixed by the fastening tapes 91, respectively.

The presentation section 51 may be disposed between the back sheet 23 and the absorber 30. The presentation part 51 may be disposed on the non-skin surface side T2 with respect to the absorbent core 31. The presentation portions 51 may extend in the front-rear direction L and be arranged with a space in the width direction W. The presentation unit 51 is disposed between the low basis weight units 33 described later. The presentation unit 51 is configured to be discolored by absorption of body fluid by the absorber 30, and can grasp the absorption state of body fluid from the non-skin surface side T2 of the disposable diaper 10.

The disposable diaper 10 may have a leg hole stretch unit 42 that stretches and contracts in the front-rear direction at a position outside the absorbent core 31 in the width direction. The leg hole stretch units 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 hole stretch units 42 are formed of band-shaped stretch pieces that stretch in the front-rear direction L. By contraction of the leg hole stretch units 42, the leg hole openings of the disposable diaper 10 are brought into contact with the leg holes when the disposable diaper 10 is worn.

The disposable diaper 10 may have a waist stretchable unit 45 extending in the width direction W along the rear end edge of the disposable diaper. The waist stretch units 45 may be provided between the back sheet 23 and the exterior sheet 24, between the front sheet 21 and the exterior sheet 24, and between the side sheets 22 and the exterior sheet 24. The rear end edge of the waist stretchable panel 45 may be positioned on the front side of the rear end edge of the disposable diaper, and the front end edge of the waist stretchable panel 45 may be positioned on the front side of the rear end edge of the absorbent core 31. The waist elastics 45 may extend outward in the width direction W from the absorbent core 31. The waist stretchable unit 45 is formed of a band-shaped stretchable sheet stretchable in the width direction W.

The disposable diaper 10 may have a pair of crotch stretch units 41 provided in a region overlapping the absorbent core 31 in the crotch region. The crotch stretch unit 41 may be disposed on the non-skin surface side of the absorbent core 31 or may be disposed on the non-skin surface side of the absorbent body 30. The crotch stretch unit 41 may be disposed between the absorbent core 31 and the back sheet 23, between the core wrap sheet 32 disposed closer to the non-skin surface side T2 than the absorbent core 31 and the back sheet 23, between the core wrap sheet 32 disposed closer to the non-skin surface side T2 than the absorbent core 31 and the absorbent core 31, or between the back sheet 23 and the outer sheet 24. The crotch stretch unit 41 of the present embodiment is disposed between the back sheet 23 and the exterior sheet 24. The crotch stretch unit 41 extends in the front-rear direction L and is disposed at intervals in the width direction W. The crotch stretch unit 41 is not disposed at the center of the absorbent core 31 in the width direction W, but two crotch stretch units 41 are disposed on both sides of the center of the absorbent core 31 in the width direction W. Thereby, the absorbent core in the region overlapping the crotch stretch unit 41 is pulled up to a position closer to the body side than the center in the width direction of the absorbent core by the contraction of the crotch stretch unit 41. The pair of crotch stretch units 41 may be positioned inward in the width direction from the outer edge of the absorbent core 31. The region located between the pair of crotch stretch units 41 is pulled up toward the body side with respect to the region located outside the pair of crotch stretch units 41 in the width direction. Thus, the center of the absorbent core in the width direction can be deformed into a convex shape with the side portions as base points, and fit between the crotch of the body can be secured. The crotch stretch unit 41 is formed of a rubber thread arranged in the front-rear direction L. In another embodiment, the crotch stretch unit 41 may be formed of a belt-like stretch sheet which stretches in the front-rear direction, may be formed of 1 rubber thread, or may be formed of 3 or more rubber threads. In the present invention, the overlapped state refers to a state in which one member is overlapped with another member in a plan view, and is a state in which another member is disposed on a skin surface side or a non-skin surface side of one member. The overlapped state includes not only a state in which one member and the other member are in contact with each other but also a structure in which the other member is interposed between the one member and the other member.

The crotch stretch unit 41 may extend across the center 10LC of the disposable diaper in the front-back direction. The center 10LC in the front-back direction of the disposable diaper can be pulled up toward the body by the contraction of the crotch stretch unit 41. In particular, in a state where the skin surface sides of the disposable diaper before use are folded in two so as to face each other, the fold due to the folding can be pulled up. In other embodiments, the crotch stretch unit 41 may be disposed only on the front side of the center 10LC or only on the rear side of the center 10LC, without crossing the center 10LC in the front-rear direction of the disposable diaper.

The crotch stretch unit 41 is positioned inward in the width direction W from the outer edge of the absorbent core 31. A region in which the contraction force of the crotch stretch unit 41 is less likely to act is provided on the absorbent core 31 at a position outside the crotch stretch unit 41 in the width direction W. Shown in fig. 3: a side region R31 located outside the crotch stretch unit 41 in the absorbent core 31; and a central region R32 between the side regions R31. The side region R31 is a region located outward in the width direction W from the crotch stretch unit 41 located outermost in the width direction W. The central region R32 is a region obtained by combining a region overlapping the crotch stretch unit 41 and a region located inward in the width direction W from the crotch stretch unit 41. The central region R32 is pulled up toward the body side with respect to the side regions R31 by contraction of the crotch stretch unit 41. The deformed form of the absorbent core 31 when worn is explained in detail in the following description.

The stretchable sections including the leakage-preventing stretchable sections 43, the leg-surrounding stretchable sections 42, the waist-surrounding stretchable section 45, and the crotch stretchable section 41 in the present invention are portions where elastic members such as rubber threads and stretchable sheets are arranged in a stretchable state, and do not include portions where elastic members are arranged in a non-stretchable state. That is, the stretchable portion is an effective length portion of the elastic member constituting the stretchable portion.

(3) Absorbent core structure

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 width-directional length 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 disposed between the wide portions disposed in the front-rear direction. The width-directional length of the narrowed portion 35 increases toward the outer side in the front-rear direction L. The top view shape of the absorbent core 31 is an hourglass timer shape. In addition, not only the absorbent core 31 but also the absorbent body including the core-covering sheet may have an hourglass timer shape.

The absorbent core 31 may have a low basis weight portion 33 in which the weight per unit area of the absorbent material is lower than that of the surrounding area. The low area weight portion 33 is provided along the front-rear direction L. The low basis weight portion 33 may extend in the front-rear direction L, may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L. The low basis weight portion 33 is a portion of the absorbent material having a lower basis weight than the surrounding absorbent core 31, is thinner in thickness than the surrounding absorbent core 31, and has lower rigidity than the surrounding absorbent core 31. Thus, the low basis weight portion 33 is likely to be a deformation base point in the worn state. The absorbent core 31 is easy to form a deformation base point extending in the front-rear direction L in the worn state. The low basis weight portion 33 may be a portion where the basis weight of the absorbent material is substantially zero (a portion where the basis weight is 0 in design but the surrounding absorbent material is included), or a portion where the absorbent material having a smaller basis weight than the surrounding is disposed. The low basis weight portion 33 may be a slit having a constant length in the width direction W, or may be a notch having a substantially zero length in the width direction W. The length of each low basis weight portion 33 in the width direction W may be 2mm or more and 10mm or less, and more preferably, may be 8mm or more and the thickness of the absorbent core 31. By setting the length of the low basis weight portion 33 in the width direction to be equal to or greater than the thickness of the absorbent core 31, the absorbent core 31 is easily deformed in the thickness direction with the low basis weight portion 33 as a base point. Further, by setting the length of the low basis weight portion 33 in the width direction to 8mm or less, it is possible to suppress the feeling of discomfort in the absorption performance due to the long length of the low basis weight portion in the width direction. The length of the low basis weight portion 33 in the front-rear direction L may be 30mm or more and 180mm or less.

The low basis weight portions 33 are arranged in pairs with a space therebetween in the width direction W. The low basis weight parts 33 may be disposed on both sides of the center 10WC of the disposable diaper in the width direction W with a space therebetween. The center of the low basis weight portion 33 in the front-rear direction L may be disposed on the rear side of the center 10LC of the disposable diaper in the front-rear direction L. The front end 33F of the low basis weight part 33 may be positioned further forward than the front end 41F of the crotch stretch part 41, and the rear end 33R of the low basis weight part 33 may be positioned in alignment with the rear end 41R of the crotch stretch part 41 or further forward than the rear end 41R. The outer edge of the low basis weight portion 33 may be aligned in the width direction with a rubber thread located on the outer side in the width direction of the rubber threads constituting the crotch stretch unit 41, and the inner edge of the low basis weight portion 33 may be aligned in the width direction with a rubber thread located on the inner side in the width direction of the rubber threads constituting the crotch stretch unit 41.

The absorbent core 31 may have a high rigidity portion 70 having higher rigidity than the surrounding area. The high rigidity portion 70 may include a central high rigidity portion 71 disposed between the pair of crotch stretch units 41, a rear high rigidity portion 72 disposed on the rear side of the crotch stretch units 41, and a front high rigidity portion 73 disposed on the front side of the crotch stretch units 41. 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 having higher flexural rigidity than the surrounding region. The high rigidity portion 70 may be a portion having a higher mass per unit area than the surrounding region, or may be a portion obtained by compressing the absorbent core 31 in the thickness direction. The high rigidity portion 70 of the present embodiment is a portion provided with a compressed portion that compresses the absorbent core 31. The compressed portion may be formed by compressing at least the absorbent core 31 in the thickness direction T, or may be formed by compressing the absorbent core 31 and other members such as the core covering sheet 32.

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 be positioned in alignment with the front end edge 33F of the low basis weight portion 33 or behind the front end 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 located forward of the center of the low basis weight portion 33 in the front-rear direction. The central high rigidity portion 71 may be disposed at a distance from the low unit area weight portion 33 in the width direction W. The central high stiffness portion 71 may straddle the center 10LC in the front-back direction of the disposable diaper and the center 10WC in the width direction W of the disposable diaper.

The crotch stretch unit 41 may be located on both sides of the center in the width direction of the central high rigidity portion 71 and extend rearward of the central high rigidity portion 71. The absorbent core 31 may have a 1 st region R41, a 2 nd region R42, and a 3 rd region R43, the 1 st region R41 may have the crotch stretch unit 41 arranged at a position rearward of the central high rigidity unit 71, the 2 nd region R42 may have the central high rigidity unit 71 and the crotch stretch unit 41 overlapped with each other in the thickness direction or the width direction, and the 3 rd region R43 may have the central high rigidity unit 71 arranged at a position forward of the crotch stretch unit 41. The 1 st region R41 and the 2 nd region R42 are adjacent in the front-rear direction L, and the 2 nd region R42 and the 3 rd region R43 are adjacent in the front-rear direction L. The rear end edge of the 1 st region R41 is aligned with the rear end edge 41R of the crotch stretch unit 41, and the front end edge of the 1 st region R41 is aligned with the rear end edge 71R of the central high rigidity portion 71. The rear end edge of the 2 nd region R42 is aligned with the front end edge of the 1 st region R41, and the front end edge of the 2 nd region R42 is aligned with the front end edge 41F of the crotch stretch unit 41. The rear end edge of the 3 rd region R43 is aligned with the front end edge of the 2 nd region R42, and the front end edge of the 3 rd region R43 is aligned with the front end 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 side edge of the rear high rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front end edge of the rear high rigidity portion 72 in the width direction W may be longer than the length of the center high rigidity portion 71 in the width direction W. The rear high rigidity portion 72 may cross the center 10WC of the disposable diaper in the width direction W. The rear high rigidity portion 72 constitutes a "high rigidity portion" of the present invention. The rear high rigidity portion 72 extends across an inner extension line 33IL and an outer extension line 33EL, the inner extension line 33IL extending in the front-rear direction L from an end edge in the front-rear direction L at the inner edge of the low unit area weight portion 33, and the outer extension line 33EL extending in the front-rear direction L from an end edge in the front-rear direction L at the outer edge of the low unit area weight portion 33. That is, the rear high rigidity portion 72 is disposed over the entire width direction of the region extending rearward from the rear end edge of the low basis weight portion 33. The inner edge and the outer edge of the low basis weight portion 33 are edges extending in the front-rear direction L. When a part of the side edge of the low basis weight portion has a relatively sharp shape, the part is an edge of a part other than the relatively sharp shape.

The front high rigidity portion 73 may be disposed on the front side of the low basis weight portion 33. The front high rigidity portions 73 may be disposed on both sides of the center 10WC of the disposable diaper in the width direction W with a space therebetween. A front high rigidity side edge 73X as a front end edge of the front high rigidity portion 73 may extend forward outward in the width direction W. The front high rigidity portion 73 constitutes a "high rigidity portion" of the present invention. The front high rigidity portion 73 extends across the inner extension 33IL and the outer extension 33 EL. That is, the front high rigidity portion is disposed over the entire region in the width direction of the region extending from the front end edge of the low basis weight portion 33 to the front side. In the modified example, 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 origin point portions 85 provided at positions rearward of the crotch stretch unit 41. The deformation base point portions 85 extend rearward and outward in the width direction W at a position rearward of the crotch stretch unit 41, and are arranged in a pair with a space therebetween in the width direction W. The deformation origin portions 85 serve as origin points from which the absorbent core 31 is deformed in the thickness direction T. The deformation base point portion 85 of the present embodiment is constituted by the outer portion 72S of the rear high rigidity portion 72. The deformation base point portion 85 has a base point edge 85E serving as an edge of a deformation base point. The substantial point edge is the edge of the fold line forming the thickness of the absorbent core 31. The base point edge 85E of the present embodiment is the outer edge 72E of the rear high rigidity portion 72. The deformation origin point portion 85 of the present embodiment includes a region extending inward from the origin point edge 85E in the direction perpendicular to the line along the origin point edge 85E by the thickness of the absorbent core 31.

Here, the outer portion in the present invention refers to a portion that occupies a certain range in the width direction W including an outer edge in the width direction W, and the outer edge refers to an outer edge in the width direction W. The inner side portion is a portion that occupies a certain range in the width direction W including an inner edge in the width direction W, and the inner side edge is an inner edge in the width direction W. The deformation origin point portion 85 is not limited to the outside portion of the high rigidity portion formed by the compressed portion, as long as it serves as an origin point for deforming the absorbent core 31 in the thickness direction.

(4) Wearing state of disposable diaper

Next, a state in which the disposable diaper 10 is put on will be described with reference to fig. 6 to 8. Fig. 6 is a view schematically showing a state of wearing the disposable diaper on a-a section. Fig. 7 is a diagram for explaining a modified form of the absorber 30 when worn on a B-B section of the disposable diaper. Fig. 8 is a view schematically showing a worn state of the disposable diaper according to the embodiment, and is a view showing a wearer in a lying state viewed from the front side. The line BL shown in fig. 6 represents a line of the wearer's body.

When the disposable diaper is worn, a force toward the skin surface side T1 and the inside in the width direction W is applied to the absorbent core 31 in the crotch region S3 by being pulled up and sandwiched between the legs of the wearer when the disposable diaper is worn, and the absorbent core 31 in the crotch region S3 deforms at a low basis weight portion extending in the front-rear direction L when the disposable diaper is worn. The absorbent core deforms in the thickness direction and is easily accommodated in the crotch of the wearer. At this time, since the rear high stiffness portion 72 and the front high stiffness portion 73 are provided across the inner extension 33IL and the outer extension 33EL, as shown in fig. 8, the deformation caused by the low basis weight portion 33 can be blocked by the rear high stiffness portion 72 and the front high stiffness portion 73. The formation of the deformation origin point by the low basis weight portion 33 can be suppressed over the entire region of the absorbent core 31 in the front-rear direction L, and the occurrence of a gap between the buttocks and the disposable diaper and a gap between the abdomen and the disposable diaper can be suppressed. This allows the absorbent core to be deformed so as to fit along the crotch of the body, and allows the absorbent core to fit along the hips and abdomen of the wearer, thereby preventing leakage. In addition, the low basis weight portion 33 serving as a deformation origin of the absorbent core 31 has a lower basis weight than the surrounding region, and can maintain the deformed state while suppressing the thickness even after the body fluid is absorbed.

In the present embodiment, the rear high-rigidity portion 72 and the front high-rigidity portion 73 are provided so as to extend across the inner extension 33IL and the outer extension 33EL, but either one of the rear high-rigidity portion 72 and the front high-rigidity portion 73 may extend across the inner extension 33IL and the outer extension 33 EL. The gap between the abdomen and the hip can be reduced by either the rear high rigidity portion 72 or the front high rigidity portion 73, and leakage can be suppressed.

The rear high rigidity portion 72 may have a rear high rigidity side edge 72X intersecting at least one of the outer extension 33EL and the inner extension 33 IL. 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 constitutes the base point edge 85E of the deformation base point portion. A side edge extension line 72EL extending along the rear high rigidity side edge 72X may intersect the outer side edge 31E of the absorbent core 31. The front high rigidity portion 73 may have a front high rigidity side edge 73X intersecting at least one of the outer extension 33EL and the inner extension 33 IL. A side edge extension 73EL extending along the front high rigidity side edge 73X may intersect the outer side edge 31E of the absorbent core 31.

The deformation of the absorbent core 31 from the low basis weight portion 33 extends along the outer extension 33EL or the inner extension 33IL and easily reaches the rear high rigidity side edge 72X. Further, the deformation that has reached the rear high rigidity side edge 72X extends along the rear high rigidity side edge 72X and the side edge extension 73 EL. Since the side-edge extension 73EL intersects 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 blocking the deformation caused by the low unit area weight portion 33 by the front high rigidity portion 73 and the rear high rigidity portion 72 can be 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 the fit to the buttocks and the abdomen is more easily ensured.

The intersection of the extended side edge and the outer edge 31E of the absorbent core 31 may be located outward in the front-rear direction L than the high-rigidity side edge. Specifically, the intersection point P1 between the side edge extension 72EL and the outer edge 31E of the absorbent core 31 may be located more rearward than the rear high rigidity side edge 72X, and the intersection point P2 between the side edge extension 73EL and the outer edge 31E of the absorbent core 31 may be located more forward than the front high rigidity side edge 73X. With this structure, the deformation caused by the low basis weight portion 33 can be guided to a position away from the crotch. Thereby, the absorbent core 31 is deformed so as to be along the crotch of the body, and it becomes easier to make the absorbent core 31 along at least one of the hip and the abdomen of the wearer.

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. Compared 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 reaches the rear high rigidity side edge 72X and the front high rigidity side edge 73X is guided to the outer edge 31E of the absorbent core 31 gently. By gently deforming the absorbent core 31, formation of unintended unevenness in the absorbent core 31 is suppressed, and the absorbent core 31 is easily further fitted to the body.

An intersection P1 between the outer edge extension 72EL of the rear high rigidity portion 72 and the outer edge 31E of the absorbent core 31 may be located further outward in the front-rear direction L than the narrow portion 35. The intersection P2 between the side edge extension 73EL of the front high rigidity portion 73 and the outer edge of the absorbent core 31 may be located further outward in the front-rear direction L than the narrow portion 35. The deformation caused by the low unit area weight portion 33 is easily guided to the wide portion. The wide portion is further from the leg than the narrow portion 35 and is less deformed by the action of the leg. Therefore, even when the legs are strongly moved, the shape of the absorbent core 31 is easily maintained, the length of the absorbent core 31 in the width direction W is ensured, and the deformation caused by the low basis weight 33 can be absorbed. Therefore, even when the deformation origin points along the groin portions of the wearer are formed in the absorbent core by the movement of the legs, the deformation along the groin portions is suppressed from being interlocked with the deformation caused by the low basis weight portions 33, and the length of the absorbent core 31 in the width direction can be secured. This enables the buttocks and abdomen to be covered with the absorbent core, and leakage to be further suppressed.

The distance L1 between the rear high rigidity portion 72 and the low basis weight portion 33 in the front-rear direction L may be 15mm to 30 mm. The distance L2 between the front high rigidity portion 73 and the low basis weight portion 33 in the front-rear direction L may be 15mm to 30 mm. By setting the distance L1 and the distance L2 to 15mm or more, the deformation of the absorbent core 31 by the low basis weight portions 33 does not directly reach the rear high rigidity portions 72 and the front high rigidity portions 73, and easily reaches the rear high rigidity portions 72 and the front high rigidity portions 73 in a state where the deformation is weakened. This makes it easier to obtain the effect of blocking the deformation of the absorbent core 31 by the rear high stiffness portions 72 and the front high stiffness portions 73. Further, by setting the distance L1 and the distance L2 to 30mm or less, the region in which the deformation of the low basis weight portion 33 propagates in the front-rear direction L is reduced, and the absorbent core 31 can be arranged so as to cover the body over a wide range.

The length of the rear 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 rear high rigidity portion 72 has a long length in the front-rear direction L, deformation of the region relative to the buttocks is suppressed, and a space for accommodating feces and urine is easily secured. On the other hand, the front high rigidity portion 73 has an effect of cutting the deformation of the low unit area weight portion 33. The front high rigidity portion 73 has a relatively short length in the front-rear direction L, and easily ensures an area of the absorbent core covering the front waistline region S1.

The center in the front-rear direction L of the low basis weight section 33 may be disposed more rearward than the center 10LC in the front-rear direction L of the disposable diaper 10, and the distance L1 between the rear high rigidity section 72 and the low basis weight section 33 in the front-rear direction L may be shorter than the distance L2 between the front high rigidity section 73 and the low basis weight section 33 in the front-rear direction L. Since the low basis weight portion 33 is shifted toward the rear side, deformation from the low basis weight portion 33 can be provided on the hip side. Further, since the distance L1 in the front-rear direction L between the rear high stiffness portion 72 and the low basis weight portion 33 is relatively short, the deformation of the absorbent core 31 with the rear high stiffness portion 72 as the base point is easily interlocked with the deformation of the absorbent core 31 due to the low basis weight portion 33. Thus, the buttocks can be easily covered with 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 between the front high rigidity portion 73 and the low basis weight portion 33 in the front-rear direction L is relatively long, and the deformation of the low basis weight portion 33 is easily reduced and reaches the front high rigidity portion 73. The effect of enabling the front high rigidity portion 73 to cut the deformation caused by the low unit area weight portion 33 can be more easily obtained.

When the tape-type disposable diaper 10 is to be put on, the rear body area S2 of the disposable diaper 10 is first placed on the hips of the wearer in a state where the disposable diaper 10 is unfolded. Then, the disposable diaper 10 is passed between the legs of the wearer, and the body is covered with the crotch region by pulling the diaper toward the crotch region side. At this time, the disposable diaper is pulled in the front-rear direction L, and the absorbent core 31 is easily deformed with the deformation origin point portion 85 constituted by the rear high stiffness portion 72 as an origin point. The deformation origin point portion 85 is provided rearward of the crotch stretch unit 41 and the low basis weight portion 33, and forms a deformation origin point of the absorbent core 31 rearward of the crotch stretch unit 41 and the low basis weight portion 33. The deformation origin portions 85 extend outward in the width direction W toward the rear side, and the absorbent core 31 is formed with deformation origin points extending inward in the width direction W from the rear body surrounding region toward the crotch region.

Thus, when the rear body region is placed on the buttocks and the diaper is pulled toward the crotch region, the absorber is deformed by the base point extending inward in the width direction W from the rear body region toward the crotch region. Specifically, as shown in fig. 7, the absorbent body in the region where the deformation origin portions 85 are provided is deformed with the outer edge 72E of the high stiffness portion 72 (the origin edge 85E of the deformation origin portions 85) as the origin, and the region inside in the width direction W with respect to the outer edge 72E is disposed on the skin surface side with respect to the region outside in the width direction W with respect to the outer edge 72E. The reason why the region on the inner side in the width direction W than the outer edge 72E is arranged on the skin surface side than the region on the outer side in the width direction W than the outer edge 72E is: the center in the width direction W of the absorbent core 31 is pulled up toward the body side by contraction of the crotch stretch unit 41, and a force is normally applied to the center in the width direction W of the absorbent core 31 when the wearer pulls the diaper; and the center of the absorbent core 31 in the width direction W is pulled up in a state where the outer side portion of the absorbent article (for example, the vicinity of the leg hole openings) is fitted over the legs at the time of wearing. The absorbent core 31 deforms toward the crotch region side so that the length in the width direction W becomes shorter by deforming from the deformation origin point portions 85 as origin points. 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 folded smoothly, and formation of unintended gathers and generation of gaps with respect to the body can be suppressed.

As shown in fig. 6 and 8, the absorbent core 31 located at the front side of the deformation base point portions 85 deforms to a convex shape toward the body side due to contraction of the pair of crotch stretch units 41, and the central region R32 stands up with respect to the side regions R31. Thus, the absorbent core 31 in the crotch region is arranged along the body side, and the absorbent core 31 can be appropriately accommodated in the crotch of the wearer.

The absorbent core 31 can be covered over a wide area with respect to the buttocks of the wearer, and the absorbent core 31 can be compactly stored in the gap between the legs of the wearer. By disposing the disposable diaper at an appropriate position between the wearer's thighs, the front waistline region can be pulled up to a position covering the abdomen of the wearer. In a tape-type disposable diaper, the body of a wearer can be appropriately covered.

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 the angle of the front high rigidity side edge 73X with respect to the width direction 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 so that the length of the absorbent core in the width direction is shortened in a short range in the front-rear direction L.

On the other hand, the front torso-surrounding region is a region that is finally hit against the body after the rear torso-surrounding region and the crotch region are hit against the body when worn. Therefore, it is preferable that the front skirt region is configured not to provide a deformation base point when worn, but to cover the body in a flat state. Since the angle of the front high rigidity side edge 73X with respect to the width direction is relatively small, the deformation of the low basis weight portion 33 can be smoothly cut off, and the body can be covered with the front body surrounding region in a flat state.

The outer edge of the crotch stretch unit 41 may be disposed outward in the width direction W from the outer edge of the deformation origin point unit 85. However, it is more preferable that the outer edge of the crotch stretch unit 41 be disposed inward in the width direction W from the outer edge of the deformation origin point unit 85. With such a configuration, the deformation of the absorbent core 31 with the deformation origin point portions 85 as origin points and the deformation of the absorbent core 31 due to the crotch stretch unit 41 are more easily interlocked. This makes it easier to dispose the absorbent core 31, which has been deformed so that the length in the width direction W from the back body surrounding region toward the crotch region side is shorter, closer to the body side in the crotch region. The outer edge of the crotch stretch unit 41 is the outer edge of the elastic member located outermost in the width direction W, of the elastic members constituting the crotch stretch unit 41. The rubber thread constituting the crotch stretch unit 41 of the present embodiment is arranged in the front-rear direction L, and the elastic member positioned on the outer side in the width direction W constitutes the outer edge of the crotch stretch unit 41.

The deformation base point portions 85 and the crotch stretch unit 41 may be shifted in the width direction W. However, it is more preferable that at least a part of the deformation base point portion 85 be disposed on an extension line extending from the rear end edge of the crotch stretch unit 41 to the rear side. The deformation of the absorbent core 31 with the deformation origin point portions 85 as origin points is more likely to be interlocked with the deformation of the absorbent core 31 caused by the crotch stretch unit 41. This makes it easier to dispose the absorbent core 31, which has been deformed so that the length in the width direction W from the back body surrounding region toward the crotch region side is shorter, closer to the body side in the crotch region. In the embodiment where a plurality of elastic members are provided to constitute the crotch stretch unit 41, the deformation base point units 85 may be arranged on the extension line of at least one of the elastic members.

The deformation base point portions 85 may cross the 1 st intermediate line ML1 along the front-rear direction L, and the 1 st intermediate line ML1 is located between the center 10LC of the disposable diaper in the front-rear direction L and the front end edge of the joint portion 93 in the front-rear direction L. As shown in fig. 1, the 1 st intermediate line ML1 is a line that passes through the center 10LC in the front-rear direction L of the disposable diaper and the center in the front-rear direction L of the front end edge of the joint 93 and extends in the width direction W. The position more posterior than the 1 st middle line ML1 is generally the area that bears the buttocks when worn. The deformation base point 85 is arranged from an area where the buttocks of the wearer are supported to an area where the buttocks are not supported, across the 1 st intermediate line ML1 in the front-rear direction L. When the absorbent core 31 is worn, the region not bearing the buttocks is pulled forward in a state where the region on the rear side of the 1 st intermediate line ML1 is pressed by the buttocks, and the absorbent core is more easily deformed with the deformation origin point portion 85 as the origin point. This allows the absorbent core 31 to be deformed so that the width of the absorbent core 31 becomes shorter, and the disposable diaper can be placed at an appropriate position between the wearer's thighs to appropriately cover the body of the wearer.

The rear end edge 41R of the crotch stretch unit 41 may be disposed on the front side of the 1 st intermediate line ML 1. The rear end edge 41R of the crotch stretch unit 41 is disposed in a region not supporting the hip of the wearer. When the wearer wears the garment, the crotch stretch unit 41 is more easily stretched by pulling the region not bearing the buttocks forward in a state where the region on the rear side of the 1 st intermediate line ML1 is pressed by the buttocks. This makes it easier to pull up the region where the crotch stretch unit 41 is disposed with respect to the body, and the absorbent core 31 can be further appropriately accommodated between the wearer's thighs.

The front end edge of the deformation base point portion 85 may be disposed on the front side of the 2 nd intermediate line ML2, and the 2 nd intermediate line ML2 may be located between the rear end edge of the deformation base point portion 85 and the rear end edge of the crotch stretch unit 41 in the front-rear direction L. As shown in fig. 1, the 2 nd intermediate line ML2 is a line extending in the width direction W passing through the middle between the rear end edge of the deformation base point portion 85 and the rear end edge 41R of the crotch stretch unit 41 in the front-rear direction L. The deformation origin point portions 85 are provided in a region of at least half of the region between the rear end edge of the deformation origin point portion 85 and the rear end edge of the crotch stretch unit 41. Thus, the deformation of the absorbent core 31 with the deformation origin point portions 85 as origin points is easily interlocked with the deformation of the absorbent core 31 by the crotch stretch unit 41. This makes it easy to deform the absorbent core 31 from the rear torso-surrounding region S2 to the crotch region S3 to a shape conforming to the body, and enables the absorbent core 31 to 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 thighs and can appropriately cover the body of the wearer.

A high rigidity portion having higher rigidity than that of a region on the outer side in the width direction W than the deformation base point portions 85 may be provided between the pair of deformation base point portions 85. In the present embodiment, the outer side portions of the rear high rigidity portion 72 constitute deformation base point portions 85, and the region between the outer side portions of the rear high rigidity portion 72 constitutes a high rigidity portion of the present structure. By providing the high rigidity portion between the deformation base point portions 85, a difference in rigidity occurs between the region outside the deformation base point portions 85 in the width direction W and the region inside the deformation base point portions 85, and the absorbent core 31 is more easily deformed with the deformation base point portions 85 as base points. This makes it easier for the absorbent core 31 to deform toward the crotch region side so that the length in the width direction W becomes shorter, and makes it easier to accommodate the absorbent core 31 between the wearer's thighs. By disposing the disposable diaper at an appropriate position between the wearer's thighs, the body of the wearer can be covered appropriately. In addition, in the deformation base point portion having relatively low rigidity, the rigidity of the high rigidity portion between the pair of deformation base point portions 85 may be higher than the rigidity of the deformation base point portion.

The high rigidity portion between the pair of deformation base point portions 85 may be adjacent to the deformation base point portions 85 in the width direction W. The region on the outer side in the width direction W than the deformation origin portions 85 is easily deformed with respect to the region between the deformation origin portions 85, and the difference in rigidity makes the absorbent core 31 more easily deformed. The pair of deformation base point portions 85 are integrated by a high rigidity portion. The deformation base point portions 85 are integrated with the high rigidity portion and easily deform in a convex shape toward the wearer side, and the absorbent core 31 is more easily accommodated in the crotch of the wearer.

The deformation base point portion 85 and the high rigidity portion between the deformation base point portions 85 in the present embodiment are both constituted by the rear high rigidity portion 72 constituted by the pressing portion. Thus, the deformation base point portion 85 and the high rigidity portion can be formed integrally, and the boundary between the deformation base point portion 85 and the high rigidity portion may not be formed. The rear high rigidity portion 72 can function as the deformation base point portion 85 and as the high rigidity portion as a whole. Further, the deformation base point portion 85 formed by the pressing portion has high rigidity, and the deformation of the absorbent core 31 is more easily stabilized.

The pair of deformation base point units 85 are disposed so as to sandwich the center of the disposable diaper in the width direction W, and at least a part of the deformation base point units 85 may be disposed at a position outside the 3 rd intermediate line ML3 in the width direction W, the 3 rd intermediate line ML3 being located between the center of the absorbent core 31 in the width direction W and the maximum width of the absorbent core 31. As shown in fig. 1, the 3 rd intermediate line ML3 is a line that passes through the center in the width direction W of the absorbent core 31 and the center in the maximum width of the absorbent core 31 and extends in the front-rear direction L. In the region of the absorbent core 31 that is half or more in the width direction W, the absorbent core 31 is easily deformed with the deformation origin point portions 85 as origin points. The absorbent core 31 is easily deformed so that the length in the width direction W becomes shorter toward the crotch region in a wide range of the absorbent core 31, and the absorbent core 31 is more easily accommodated in the crotch of the wearer.

The leg hole stretch units 42 may be disposed on an extension EL2 extending outward in the width direction W from the deformation base point unit 85. The extension line EL2 is a line extending outward in the width direction W from an arbitrary position of the deformation base point portion 85, and a plurality of extension lines EL2 are provided at different positions in the front-rear direction L. At least a part of the leg hole expansion/contraction part 42 may be disposed on any extension line EL 2. When the diaper is pulled toward the crotch region side with the rear body area bearing the buttocks, the rear body area 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 where the leg hole stretch units and the buttocks are fitted to the body, the central region R32 is easily raised with respect to the side regions R31 at a position forward of the buttocks, and the absorbent core 31 is more easily deformed with the deformation origin point units 85 as origin points.

The leg hole stretch units 42 may be disposed on an extension line extending outward in the width direction W from the crotch stretch unit 41. The absorbent core 31 is deformed in a state where the leg hole stretch units are fitted to the body, and the central region R32 is more likely to stand up relative to the side regions R31. The absorbent core 31 is more easily pulled up toward the wearer side by the contraction of the crotch stretch unit 41.

The leg hole stretch units 42 may extend rearward and outward in the width direction W. The leg hole stretch units extending toward the rear side and toward the outer side in the width direction W are in close contact with the body, and the hips of the wearer can be covered with the disposable diaper. 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 in a state where the absorbent core covers the buttocks in a wide range toward the rear side. The absorbent core 31 can be appropriately accommodated in the crotch of the wearer, and the whole body can be covered with the disposable diaper, and leakage can be suppressed.

The absorbent core 31 may have a flap portion 27 extending rearward and outward in the width direction W at a position outward in the width direction W, and the flap portion 27 may be disposed on the extension line EL 2. The flap portion 27 extends rearward and outward in the width direction W at the outer portion of the disposable diaper, and is indicated by hatching in fig. 1. When the rear body area is placed over the buttocks and the diaper is pulled toward the crotch area, the rear body area is pressed against the buttocks and the side flap portions on the outer side in the width direction W than the absorbent core 31 easily come into contact with the legs. Thus, the absorbent core 31 is deformed in a state where the side flap portions positioned on the outer sides in the width direction W and the regions for supporting the buttocks are pressed, and is more easily deformed with the deformation origin portions 85 as origin points.

The crotch stretch unit 41 may be disposed on both outer sides in the width direction W with respect to the central high rigidity unit 71. The region on the outer side in the width direction W than the central high rigidity portion 71 can be pulled up toward the body by the contraction of the crotch stretch unit 41. This makes it easy for the vicinity of the low basis weight portion 33 to deform convexly toward the body. In addition, the central high rigidity portion 71 is less likely to contract due to the crotch stretch unit 41. This can maintain the convex shape along the crotch, while ensuring the absorption area, and can reduce leakage.

The low basis weight portion 33 may be disposed in a region overlapping the crotch stretch unit 41. The absorbent core 31 deforms when worn, with the low basis weight portion 33 extending in the front-rear direction L as a base point. This makes it easier to deform the absorbent core 31 into a convex shape toward the body side by contraction of the crotch stretch unit 41, and the absorbent core 31 can be appropriately accommodated in the crotch of the wearer.

(5) Modification example

Next, an absorbent core of a modified example will be described. Fig. 9 is a plan view schematically showing an absorbent core 31 having a high rigidity portion according to a modification. In the following description of the modified examples, only the configurations different from the above-described embodiment will be described, and the same reference numerals are used for the same configurations as those of the embodiment, and the description thereof will be omitted.

Fig. 9 (a) shows an absorbent core 31A having a rear high stiffness portion 72A of modification 1. A pair of the rear high rigidity portions 72A is disposed with a space in the width direction W on both sides of the center 10WC of the disposable diaper in the width direction. 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 is easily used to secure the absorption performance of body fluid. In the form in which the high rigidity portions 72A are formed with the pressed portions, no pressed portion is formed in the region between the high rigidity portions 72A. This prevents the absorbent core 31 from becoming too hard, and the softness is easily maintained. The intersection point P1 between the side edge extension 73EL and the outer edge 31E of the absorbent core 31 may be located at the narrower portion 35. The deformation caused by the low basis weight portion 33 can be guided to the narrow portion 35, and the deformation at the wide portion, which is the region of the maximum width of the absorbent core 31, can be suppressed. The wide portion can cover the buttocks and the abdomen, and leakage can be suppressed.

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

Fig. 9 (C) shows an absorbent core 31C having a rear high rigidity portion 72C of modification 3. The rear high rigidity side edge 72X of the rear high rigidity portion 72C extends inward in the front-rear direction L toward the outer side in the width direction. Thus, the intersection P1 between the side edge extension 72EL and the outer edge 31E of the absorbent core 31 is located inward in the front-rear direction L than the rigid side edge 72X.

The measurement of "weight per unit area of absorbent core" in the present specification was performed by the following measurement method. When the disposable diaper 10 is sealed in a package or the like, a sample is taken out from the package and left in this state for 12 hours in an environment of 20 ℃. + -. 2 ℃ and a relative humidity of 60%. + -. 5% RH. In the case of a disposable diaper packaged with a packaging sheet or the like, the packaging sheet is opened and the folded disposable diaper is unfolded. Next, a portion for measuring the basis weight 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 weight per unit area of the absorbent core were measured. The weight per unit area was calculated based on the weight and the area.

The "flexural rigidity" in the present specification may be a value measured from gurley stiffness. The measurement of the Gurley stiffness can be carried out in accordance with JIS-L1096 using a Gurley softness tester No311 manufactured by Antian Seiki machine (manufactured by Kabushiki Kaisha). The length of the sample in the width direction W for the measurement of gurley stiffness can be set to 30mm, and the length in the front-rear direction can be set to 25 mm.

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

In addition, the entire contents of japanese patent application No. 2018-152782, filed on 14.8.8.2018, are incorporated by reference in this specification.

Industrial applicability

The present invention can provide a disposable diaper in which the absorbent core can be deformed so as to fit along the crotch of the body and also can be disposed along a part other than the crotch of the wearer to suppress leakage.

Description of the reference numerals

10. A disposable diaper; 10LC, center in the front-rear direction of the diaper; 10WC, center of the diaper in the width direction; 21. a dough sheet; 22. a side sheet; 23. a back sheet; 24. an outer sheet; 27. a flank portion; 30. an absorbent body; 31. an absorbent core; 32. a chip-in-chip; 33. a low unit area weight portion; 33IL, medial extension; 33EL, outer extension; 35. a narrow portion; 41. a crotch stretch unit; 42. a leg-surrounding expansion part; 43. a leakage-proof expansion part; 45. a waist-stretching portion; 51. a presentation unit; 71. a central high-rigidity portion (high-rigidity portion); 72. a rear high-rigidity portion (high-rigidity portion); 72EL, side edge extension; 73. a front high-rigidity portion (high-rigidity portion); 73EL, side edge extension; 85. a deformation base point portion; 91. a fastening tape; 92. a base; 93. a bonding section; 95. a target portion; ML1, 1 st intermediate line; ML2, middle line 2; ML3, 3 rd middle line; s1, a front surrounding area; s2, a posterior body surrounding area; s3, a crotch region; t, the thickness direction; t1, skin surface side; t2, non-skin face side; l, the front-back direction; w, width direction.

Claims

1. A disposable diaper having:

a front-back direction and a width direction orthogonal to each other;

a front torso-surrounding region, a rear torso-surrounding region, and a crotch region disposed between the front torso-surrounding region and the rear torso-surrounding region; and

an absorbent core disposed at least in the crotch region,

a pair of low basis weight portions extending in the front-rear direction and arranged at an interval in the width direction are formed in the absorbent core in the crotch region,

wherein the content of the first and second substances,

the absorbent core is provided with a high rigidity portion having higher rigidity than the surrounding area,

the high rigidity portion extends in the front-rear direction from an end edge in the front-rear direction of an inner edge of the low unit area weight portion, and extends in the front-rear direction from an end edge in the front-rear direction of an outer edge of the low unit area weight portion,

the high rigidity portion has a front high rigidity portion disposed forward of the low unit area weight portion and a rear high rigidity portion disposed rearward of the low unit area weight portion,

the center in the front-rear direction of the low basis weight portion is disposed more rearward than the center in the front-rear direction of the disposable diaper, and the distance in the front-rear direction between the rear high rigidity portion and the low basis weight portion is shorter than the distance in the front-rear direction between the front high rigidity portion and the low basis weight portion.

2. The disposable diaper according to claim 1,

the high-rigidity portion has a high-rigidity side edge intersecting at least one of the outer extension line and the inner extension line,

the extension of the side edge extending along the high rigidity side edge intersects the outer side edge of the absorbent core.

3. The disposable diaper according to claim 2,

the intersection of the side edge extension and the outer edge of the absorbent core is located outward in the front-rear direction from the high-rigidity side edge.

4. The disposable diaper according to claim 2 or 3,

the absorbent core has a narrow portion whose length in the width direction is shorter than the maximum width of the absorbent core,

an intersection of the side edge extension line and the outer edge of the absorbent core is disposed in the narrow portion.

5. The disposable diaper according to claim 2 or 3,

the intersection of the side edge extension line and the outer edge of the absorbent core is disposed further outward in the front-rear direction than the narrow portion.

6. The disposable diaper according to any one of claims 1 to 3,

the distance between the high rigidity portion and the low basis weight portion in the front-rear direction is 15mm to 30 mm.

7. The disposable diaper according to claim 1,

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.