JP2020025788A - Disposable diaper - Google Patents

Abstract

To provide a disposable diaper capable of reducing leakage by deforming an absorbent core along crotch of a body.SOLUTION: An absorbent core in an inseam area of a disposable diaper (10) is provided with a pair of low basis weight parts (33) extending in a cross direction and arranged with an interval in a width direction, and with a center high rigidity part (71) having higher rigidity than a peripheral area between the pair of low basis weight parts. Assuming that a length in the width direction of the center high rigidity part is A, and that a distance between the center high rigidity part and the low basis weight part is B, A+B×2>A and B×2<A are satisfied.SELECTED DRAWING: Figure 2

Description

  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 and a high rigidity portion provided between the pair of low basis weight portions.

  2. Description of the Related Art Disposable diapers having a pair of low-basis portions extending in the front-rear direction in the crotch region as a pair of low-basis portions and a high-rigidity portion provided between the pair of low-basis portions are known (for example, Patent Documents) 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 at the base point of the groove portion extending in the front-rear direction when worn, and is deformed in the thickness direction. At this time, the high-rigidity portion provided between the groove portions attempts to maintain the deformation of the absorbent core with the groove portion as a base point (see, for example, FIG. 4, paragraph 0020 of Patent Document 1).

JP 2018-472 A

  In a state in which the disposable diaper configured as described above is worn, the groove-shaped portion is deformed to be convex toward the body side, and the fit of the wearer to the crotch is improved. However, the high-rigidity portion is provided so as to straddle the pair of groove-shaped portions, and increases the rigidity of the entire region sandwiched between the groove-shaped portions. Therefore, when the region sandwiched by the groove portions is longer than the length in the width direction of the crotch, the high-rigidity portion does not fit in the crotch and the leg may hit the high-rigidity portion, causing a sense of incongruity. Alternatively, it is not possible to maintain the convex deformation starting from the groove-shaped portion, and there is a risk that a gap may be formed with respect to the body and leakage may occur.

  Therefore, a disposable diaper that can reduce the leakage by deforming the absorbent core along the crotch of the body is desired.

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

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. It is a schematic cross section along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross section along the BB cross section of the disposable diaper shown in FIG. It is the figure which showed typically the mounting state in the AA cross section of a disposable diaper. It is the figure which showed typically the mounting state of the disposable diaper which concerns on embodiment.

(1) Outline of Embodiment At least the following matters will be apparent from the description of the present specification and the accompanying drawings.
The disposable diaper according to one aspect 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. And a pair of low-basis weight portions extending in the front-rear direction and arranged at intervals in the width direction, the absorbent core having the crotch region, A high-rigidity portion having a higher rigidity than a surrounding region between a pair of low-basis weight portions, and a disposable diaper provided with the length of the high-rigidity portion in the width direction A, the high-rigidity portion and Assuming that the distance from the low basis weight portion is B, the above A + the above B × 2> the above A is satisfied, and the above B × 2 <the above A is satisfied.

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

  In addition, in order to satisfy B × 2 <A, the ratio occupied by the high rigidity portion in the region between the low basis weight portions is higher than the ratio occupied by the distance B. Therefore, the absorbent core is arranged along the body between the low-basis weight parts, and the gap to the body can be reduced. Leakage can be reduced by deforming the absorbent core along the crotch of the body.

  According to a preferred aspect, the disposable diaper is folded such that skin sides of the disposable diaper face each other with a fold extending in the width direction as a base point, and the high-rigidity portion straddles the fold. Good.

  According to this aspect, in the vicinity of the fold of the disposable diaper, the disposable diaper is easily deformed in a convex shape toward the non-skin side due to the folding habit. When the high-rigidity portion straddles the fold, the deformation due to the folding habit is suppressed, and the convex deformation toward the body side is easily maintained.

  According to a preferred aspect, the crotch region has a pair of crotch extendable portions that extend and contract in the front-rear direction, and the crotch extendable portions may be arranged outside both of the high rigidity portions in the width direction.

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

  According to a preferred aspect, at least a part of the crotch elastic portion may be arranged in a region overlapping with the low basis weight portion.

  According to this aspect, since the crotch elastic portion overlaps with the low basis weight portion, the crotch elastic portion is easily contracted, and the convex deformation is more easily maintained.

  According to a preferred aspect, in a region extending in the width direction from the crotch elastic portion, the high rigidity portion includes an overlapping region in which the high rigidity portion is disposed, and the length of the overlapping region in the front-rear direction is the high rigidity. It may be 以下 or less of the length of the portion in the front-rear direction.

  According to this aspect, the entire high-rigidity portion is unlikely to contract due to contraction of the crotch elastic portion. Therefore, while ensuring the absorption area, the high-rigidity portion can easily maintain the convex shape along the crotch, and leakage can be reduced.

  According to a preferred aspect, when the distance between the low-basis weight portion and the outer edge of the absorbent core is D, and the length between the outer edges of the absorbent core is E, D> E / 4 is satisfied. Good.

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

  According to a preferred aspect, the distance between the first low basis weight portion, which is one of the pair of low basis weight portions, and the high rigidity portion is B1, and the distance, which is the other of the pair of low basis weight portions, is B1. Assuming that the distance between the low-basis-weight portion and the high-rigidity portion is B2, B1 ≠ B2 may be satisfied.

  According to this aspect, since the distance B1 between the first low basis weight portion and the high rigidity portion and the distance B2 between the second low basis weight portion and the high rigidity portion are different, when a force is applied from both left and right sides, One of the area of the distance B1 and the area of the distance B2 is deformed first. For this reason, a force is uniformly applied to the high-rigidity portion from both the left and right sides, and the problem that the high-rigidity portion itself is bent can be suppressed. Therefore, it is possible to maintain a convex shape along the crotch, secure an absorption area, and reduce leakage.

  According to a preferred aspect, the high rigidity portion may be arranged only in a region sandwiched by the low basis weight portions.

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

(2) Overall Schematic Configuration of Disposable Diaper Hereinafter, a disposable diaper according to 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 cross-sectional view along the AA cross section of the disposable diaper shown in FIG. FIG. 4 is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. In addition, the extended state in this invention is the state which extended the disposable diaper 10 to the state where a wrinkle is not formed. The natural state in the present invention means that in the case of the disposable diaper 10 housed in a package, the disposable diaper 10 is taken out from the package and is placed under an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It is in a state of being left for 24 hours.

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

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

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

  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 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 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-back direction L may be provided. The leak-proof extension / contraction section 43 may be made of a thread rubber that extends and contracts in the front-rear direction L. The side sheet 22 and the leakproof expansion / contraction part 43 constitute leakproof gathers 60 that stand on the skin side T1 when worn.

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

  A fastening tape 91 is provided on the outer side 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.

  An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicators 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight parts 33 described later. The indicator 51 is configured to be discolored by the absorption of the body fluid by the absorber, so that the absorption state of the body fluid can be grasped from the non-skin surface side T2 of the disposable diaper 10.

  The disposable diaper 10 may include a 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.

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

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

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

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

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

  The central high rigidity portion 71 is provided in a region between the pair of low basis weight portions 33. The front edge 71F of the central high rigidity portion 71 may be coincident with the front edge 33F of the low basis weight portion 33 or may be located behind the front edge 33F of the low basis weight portion 33. The rear end edge 71R of the central high rigidity portion 71 may be located on the front side of the rear end edge 33R of the low basis weight portion 33. The center of the central high rigidity portion 71 in the front-rear direction L may be disposed on the front side of the center of the low basis weight portion 33 in the front-rear direction L. The central high-rigidity portion 71 may be arranged at an interval from the low-basis-weight portion 33 in the width direction W. The central high rigidity portion 71 may straddle the center 10LC of the disposable diaper in the width direction W and the center 10LC of the disposable diaper. The central high rigidity portion 71 constitutes the “high rigidity portion” of the present invention. As shown in FIG. 2, when the length of the central high rigidity portion 71 in the width direction W is A, and the distance between the central high rigidity portion 71 and the low basis weight portion 33 is B, A + B × 2> A is satisfied, and B is satisfied. × 2 <A is satisfied.

  The inseam extension / contraction 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 <b> 42 and a third region R <b> 43 in which the central high-rigidity portion 71 is arranged on the front side of the crotch elastic portion 41 may be provided. The first region R41 and the second region R42 are adjacent in the front-rear direction L, and the second region R42 and the third region R43 are adjacent in the front-rear direction L. The rear edge of the first region R41 coincides with the rear edge 41R of the crotch elastic portion 41, and the front edge of the first region R41 coincides with the rear edge 71R of the central high rigidity portion 71. The rear edge of the second region R42 matches the front edge of the first region R41, and the front edge of the second region R42 matches the front edge 41F of the crotch elastic portion 41. The rear edge of the third region R43 matches the front edge of the second region R42, and the front edge of the third region R43 matches the front edge 71F of the central high rigidity portion 71.

  The central high rigidity portion 71 may be arranged without straddling the fold FL. Further, the front edge 71F of the central high rigidity portion 71 may extend forward from the front edge 33F of the low basis weight portion 33. The central high rigidity portion 71 may be an aggregate of a plurality of high rigidity portions separated in the front-rear direction. An aggregate of a plurality of high rigidity portions may be integrated to function as the central high rigidity portion 71. The central high-rigidity portion 71 formed of an aggregate of a plurality of high-rigidity portions may be arranged such that the high-rigidity portions forming the aggregate do not cross the fold.

  The rear high rigidity portion 72 may be disposed on the rear side of the low basis weight portion 33. The outer edge of the rear high rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front edge of the rear high rigidity portion 72 in the width direction W may be longer than the length of the central high rigidity portion 71 in the width direction W. The rear high rigidity portion 72 may straddle the center 10WC in the width direction W of the disposable diaper.

  The front high rigidity portion 73 may be disposed on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC in the width direction W of the disposable diaper with an interval in the width direction W. The front edge of the front high-rigidity portion 73 may extend toward the outside in the width direction W.

  Here, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is an outer edge in the width direction W. Further, the inner portion is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W.

(4) Wearing state of disposable diaper Next, the wearing state of the disposable diaper 10 will be described based on FIGS. 5 and 6. FIG. 5 is a diagram schematically showing a wearing state of the disposable diaper in an AA cross section. Drawing 6 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. The line BL shown in FIG. 5 indicates the line of the wearer's body.

  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 based on the low basis weight portion 33 extending in the front-rear direction L when worn, and easily deforms so that the low basis weight portion 33 becomes convex toward the body. At this time, the rigidity of the region between the pair of low basis weight portions 33 is increased by the central high rigidity portion 71, and it is easy to maintain the state along the body.

  At this time, the length A of the central high rigidity portion 71 in the width direction A + (the distance B between the central high rigidity portion 71 and the low basis weight portion 33)> the length A of the central high rigidity portion 71 in the width direction W The distance B is provided between the central high rigidity portion 71 and the low basis weight portion 33. The area at the distance B is easier to deform than the central high-rigidity portion 71. When the region between the low basis weight parts does not fit in the crotch, the region at the distance B is deformed. The convex deformed state with the low basis weight part 33 as a base point and the central high rigidity part 71 can easily maintain the state along the body, and the gap to the body can be reduced.

  In addition, the low basis weight portion 33 and the central high rigidity portion 71 are spaced apart in the width direction W and are not continuous. Therefore, there is a difference in rigidity between the inner edge of the low basis weight portion 33 and the outer edge 71E of the central high rigidity portion 71 with respect to the region adjacent in the width direction. The inner edge of the low-basis weight portion 33 and the outer edge of the central high-rigidity portion 71 also serve as deformation base points. By deforming at a plurality of base points, the absorbent core is more easily fitted to the body. More specifically, as shown in FIG. 6, the absorbent core 31 is deformed with the low basis weight portion 33 as a base point, and the central region R32 becomes convex toward the body side with respect to the side region R31. Further, also in the central region R32, the rigidity changes with the outer edge 71E of the central high-rigidity portion 71 as a boundary. The region where the rigid portion 71 is arranged is convex toward the body.

  In addition, in order to satisfy B × 2 <A, the ratio occupied by the central high rigidity portion 71 in the region between the low basis weight portions 33 is higher than the ratio occupied by the distance B. Therefore, the absorbent core 31 is arranged along the body between the low-basis-weight portions 33, and the gap to the body can be reduced. Leakage can be reduced by deforming the absorbent core 31 along the crotch of the body.

  The central high-rigidity portion 71 may straddle a fold FL that is folded so that the skin surface sides of the disposable diaper 10 face each other. In the vicinity of the fold line FL of the disposable diaper 10, the disposable diaper 10 is easily deformed in a convex shape toward the non-skin side due to a folding habit. Since the central high-rigidity portion 71 straddles the fold FL, deformation due to the folding habit is suppressed, and it is easy to maintain a deformation that is convex to the body side.

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

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

  In the first region R1 extending in the width direction W from the inseam extension / contraction portion 41, there is an overlapping region R2 in which the central high rigidity portion 71 is arranged, and the length of the overlapping region R2 in the front-rear direction L is the central high rigidity portion 71. May be 以下 or less of the length L71 in the front-rear direction. The contraction of the inseam expansion / contraction part 41 makes it difficult for the entire central high rigidity part 71 to contract. Therefore, while ensuring the absorption area, the central high-rigidity portion 71 can easily maintain the convex shape along the crotch, and leakage can be reduced.

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

  Further, since the crotch elastic portion 41 is disposed on both sides of the center in the width direction of the central high rigidity portion 71, the central high rigidity portion 71 is pulled up toward the body in a certain region in the width direction. Specifically, the central high rigidity portion 71 arranged in the region (the second region R42 of the present embodiment) sandwiched in the width direction by the crotch elastic portion 41 is directly affected by the contraction of the crotch elastic portion 41, Raised to the body side. Further, in the third region R43, the central high-rigidity portion 71 does not directly act on the contraction force of the crotch elastic portion 41, and is easily arranged in a planar shape along the crotch.

  In the crotch region, the absorbent core 31 in the crotch region is arranged along the body by deforming into a convex shape protruding toward the body side over a certain region of the central high rigidity portion 71. At the time of wearing, the absorbent core 31 can be properly stored in the crotch of the wearer. The disposable diaper can be placed at an appropriate position between the wearer's crotches, and the front waist region can be pulled to a position covering the abdomen of the wearer. Therefore, in the tape-type disposable diaper, the wearer's body can be appropriately covered.

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

  The length of the third region R43 in the front-rear direction L may be longer than the length of the second region R42 in the front-rear direction L. The length of the third region R43 in the front-rear direction is ensured, the region arranged in a plane with respect to the body is ensured, and the fit to the crotch can be improved. In addition, by securing the length of the third region in the front-rear direction, a region that is pulled up toward the body is formed up to the abdomen, and a convex shape with respect to the body is maintained up to the abdomen, and the fit is improved. Can be improved.

  Assuming that the distance between the low basis weight portion 33 and the outer edge 31E of the absorbent core 31 is D, and the length between the outer edges 31E of the absorbent core 31 is E, D> E / 4 may be satisfied. Here, the outer edge 31E of the absorbent core 31 is an outer edge in a region extending in the width direction W from the low basis weight portion 33. That is, D> E / 4 may be satisfied on a straight line passing through the low basis weight portion 33 and extending in the width direction W.

  When the base is deformed convexly toward the body with the low basis weight part 33 as a base point, an area outside the low basis weight part 33 in the width direction W (area of the distance D) becomes an area that supports the convex deformation. The region outside the low basis weight portion 33 in the width direction W (the region at the distance D) is longer than １ ／ of the entire region in the width direction W of the absorbent core 31, and thus stably supports the convex deformation. , It becomes easy to maintain the convex shape.

  The distance between the first low basis weight portion 331 which is one of the pair of low basis weight portions 33 and the central high rigidity portion 71 is B1, and the second low basis weight portion which is the other of the pair of low basis weight portions 33. Assuming that the distance between 332 and the central high rigidity portion 71 is B2, B1 ≠ B2 may be satisfied. Since the distance B1 between the first low basis weight portion 331 and the central high rigidity portion 71 and the distance B2 between the second low basis weight portion 332 and the central high rigidity portion 71 are different, when a force is applied from both left and right sides, One of the area of the distance B1 and the area of the distance B2 is deformed first. For this reason, force is uniformly applied to the central high-rigidity portion from both the left and right sides, and the problem that the central high-rigidity portion itself is bent can be suppressed. Therefore, it is possible to maintain a convex shape along the crotch, secure an absorption area, and reduce leakage.

  The central high rigidity portion 71 may be arranged only in a region sandwiched between the low basis weight portions 33. That is, the front end edge 71F of the central high rigidity portion 71 coincides with the front end edge 33F of the low basic weight portion 33 or is located behind the front end edge 33F of the low basic weight portion 33, and the rear end of the central high rigidity portion 71 The edge 71 </ b> R may coincide with the rear end edge 33 </ b> R of the low basis weight portion 33 or may be located on the front side of the rear end edge 33 </ b> R of the low basis weight portion 33. Since the central high-rigidity portion 71 is provided only in the region sandwiched by the low-basis-weight portions 33, the central high-rigidity portion 71 is arranged only in the region deformed in a convex shape toward the body. The central high rigidity portion 71 can be arranged in a plane along the crotch, and the fit to the crotch can be further improved.

  The central high rigidity portion 71 may straddle the fold line FL. In the vicinity of the fold FL of the disposable diaper, the disposable diaper is easily deformed in a convex shape toward the non-skin surface side due to a folding habit. When the central high-rigidity portion 71 straddles the fold FL, deformation due to the fold habit is suppressed, and it is easy to maintain a convex deformation with respect to the body side. The fold FL is disposed in the second region R42 or the third region R43. Since the fold FL is not provided in the first region R41, it is possible to prevent a region in front of the fold FL from being pulled toward the fold FL (a side away from the body) due to contraction of the crotch elastic portion 41. Therefore, the crotch region can be made to follow the body, and the absorbent core 31 can be properly accommodated in the crotch of the wearer during wearing.

  In the modification, the central high-rigidity portion 71 does not have to straddle the fold line FL. Since the central high rigidity portion 71 does not straddle the fold FL, it is possible to prevent the central high rigidity portion 71 having relatively high rigidity from forming a folding habit due to the fold. Therefore, the deformation due to the folding habit can be suppressed, and the deformation that is convex to the body side can be maintained.

  The fold FL of the present embodiment is provided in the second region R42. The fold FL may be provided in the second region R42 behind the center of the second region R42 in the front-rear direction. The fold line FL is located behind the center in the front-rear direction of the second region R42, is provided at a position away from the front edge of the third region R43, which is a fulcrum of deformation of the absorbent core 31, and close to the action point. I have. Therefore, the deformation due to the folding habit can be more easily pulled up by the contraction of the crotch elastic portion 41.

  In a modified example, the fold FL may be provided in the third region R43. Since the crotch elastic portion 41 is not disposed across the fold line FL, it is possible to prevent a region in front of the fold line FL from being pulled toward the fold line FL (a side away from the body) due to contraction of the crotch elastic portion 41. Therefore, the crotch region can be made to follow the body, and the absorbent core 31 can be properly accommodated in the crotch of the wearer during wearing.

  The center of the low basis weight portion 33 in the front-rear direction L may be disposed behind the center 10LC of the disposable diaper 10 in the front-rear direction L. Since the low basis weight portion 33 is biased to the rear side, a deformation based on the low basis weight portion 33 can be provided on the buttocks side.

  Leg extension / contraction part 42 may be arranged on an extension extending from crotch / contraction part 41 to the outside in 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 circumference 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.

  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 the present 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 obvious 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.

  ADVANTAGE OF THE INVENTION According to this invention, a disposable diaper which can deform | transform an absorption core along a crotch of a body and can reduce a leak can be provided.

Reference Signs List 10 disposable diaper 10LC: center of diaper in the front-rear direction 10WC: center of diaper in the width direction 21 top sheet 22 side sheet 23 back sheet 24 exterior sheet 30 absorber 31 absorption core 32 core wrap 33 low basis weight section 35 narrow section 41 inseam Elastic part 42 Leg elastic part 43 Leak-proof elastic part 45 Waist elastic part 51 Indicator 71 Central high rigidity part 72 High rigidity part 73 Front high rigidity part 91 Fastening tape 92 Base part 93 Engaging part 95 Target part S1: Front Waist area S2: Rear waist area S3: Inseam area T: Thickness direction T1: Skin side T2: Non-skin side L Front-back direction W: Width direction

Claims (8)

A front-rear direction and a width direction orthogonal to each other,
Front waist area, rear waist area, and crotch area disposed between the front waist area and the rear waist area,
And at least an absorbent core arranged in the crotch region,
The absorbent core of the crotch region extends in the front-rear direction, and is disposed between the pair of low-basis weight portions and spaced apart in the width direction, and a region between the pair of low-basis weight portions is smaller than a surrounding region. A disposable diaper provided with a high rigidity and a high rigidity portion,
When the length in the width direction of the high-rigidity portion is A, and the distance between the high-rigidity portion and the low-basis weight portion is B,
A + B × 2> A is satisfied,
A disposable diaper that satisfies the condition B × 2 <the condition A. The disposable diaper is folded such that the skin surface sides of the disposable diaper face each other based on the crease extending in the width direction,
The disposable diaper according to claim 1, wherein the high-rigidity portion straddles the fold. In the crotch region, having a pair of crotch expansion and contraction portions that expand and contract in the front-rear direction,
3. The disposable diaper according to claim 1, wherein the crotch elastic portion is disposed on both sides in the width direction with respect to the high-rigidity portion. 4.   The disposable diaper according to claim 3, wherein at least a part of the crotch elastic portion is arranged in a region overlapping with the low basis weight portion. In the region extending in the width direction from the crotch elastic portion, the high rigidity portion has an overlapping region arranged,
5. The disposable diaper according to claim 3, wherein the length of the overlapping region in the front-rear direction is １ ／ or less of the length of the high-rigidity portion in the front-rear direction. 6. The distance between the low basis weight portion and the outer edge of the absorbent core is D,
When the length between the outer edges of the absorbent core is E,
The disposable diaper according to any one of claims 1 to 5, which satisfies the condition of D> E / 4. The distance between the first low basis weight portion and the high rigidity portion, which is one of the pair of low basis weight portions, is B1, and the second low basis weight portion, which is the other of the pair of low basis weight portions, and Assuming that the distance from the high-rigidity part is B2,
The disposable diaper according to any one of claims 1 to 6, which satisfies the condition of B1 Ｂ B2.   The disposable diaper according to any one of claims 1 to 7, wherein the high-rigidity portion is disposed only in a region sandwiched by the low-basis-weight portions.

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