JP7049762B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers.

Absorbent articles should be deformed to fit the wearer's body shape and adhere to the wearer's skin with good fit in order to provide a comfortable fit and prevent leakage of excrement such as urine. Is desired. As a technique that can meet such a demand, a technique for forming a slit or an opening in an absorber having particularly high rigidity among the constituent members of the absorbent article is known.

For example, Patent Document 1 describes that a plurality of elongated holes extending in the lateral direction are intermittently arranged in the rear portion of the absorber, which is a portion corresponding to the buttocks of the wearer. This elongated hole is located in the lateral central portion of the rear portion of the absorber, and has a plan view shape that is convexly curved toward the longitudinal rear end of the absorber. According to Patent Document 1, the rear portion of the absorber in which a plurality of such elongated holes are formed has a V-shape in which the lateral central portion thereof is raised toward the wearer's skin while the absorbent article is being worn. It is said that it can be transformed into a mold. The vertical direction is a direction corresponding to the front-back direction of the wearer, and the horizontal direction is a direction orthogonal to the vertical direction.

Further, Patent Document 2 describes that a plurality of slits extending laterally so as to have a longitudinal direction are formed in the rear portion of the absorber. In a plan view, the slit described in Patent Document 2 has a shape that is convexly curved toward the longitudinal front end of the absorber, contrary to the elongated hole described in Patent Document 1 described above. Further, in Patent Document 3, a raised portion that is thicker than the peripheral portion and is raised on the skin side of the wearer is provided in the central portion of the absorber, and a planar annular or arcuate concave region surrounding the raised portion is provided. It is stated that. The concave area described in Patent Document 3 is a portion where the material for forming the absorber is smaller than that in the peripheral portion.

Japanese Patent Publication No. 2008-529721 JP-A-2015-23999 Special Table 2003-528654

In the absorbent article, the part corresponding to the part from the wearer's excretion part to the buttocks is deformed during wearing due to lateral compression by the wearer's thighs, relatively violent movement of the buttocks, etc. It was larger than that of the part, which caused unintended wrinkles on the absorber, resulting in a decrease in fit.

Therefore, an object of the present invention relates to providing an absorbent article having an excellent fit to the buttocks of the wearer.

The present invention has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and the crotch part arranged in the crotch part of the wearer and the abdomen extending in the vertical direction from the front-back direction of the crotch part. An absorbent article having a side portion and a dorsal portion and having a liquid-retaining absorbent core arranged in the crotch portion, wherein the absorbent core is more than a vertical center of the absorbent article. The posterior region has a posterior first region in which the lateral length gradually increases from the longitudinal front to the posterior, and is connected to the longitudinal rear end of the posterior first region. It has a posterior second region with less change in lateral length in the vertical direction than one region, and the absorbent core does not have a material for forming the absorbent core or is compared to the peripheral portion. A plurality of low-grained regions having non-or low-deposited portions having a small amount of the forming material are formed, and the plurality of low-grained regions are each laterally outward from the lateral central portion of the absorbent core in a plan view. It is intended to provide an absorbent article having a portion extending obliquely toward the front in the vertical direction and having at least a part of a plurality of the low grain regions in the rear first region.

According to the present invention, there is provided an absorbent article having an excellent fit to the buttocks of the wearer.

FIG. 1 is a perspective view schematically showing an example of a pants-type disposable diaper according to an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin-facing surface side of the diaper shown in FIG. 1 in the unfolded and stretched state. FIG. 3 is a cross-sectional view schematically showing the cross section taken along the line II of FIG. FIG. 4 is an exploded perspective view schematically showing the diaper shown in FIG. 1 in an exploded manner. FIG. 5 is a plan view schematically showing the skin-facing surface side of the absorbent core included in the diaper shown in FIG. FIG. 6 is a perspective view schematically showing a deformed state of the rear first region and the rear second region of the absorbent core while wearing the diaper shown in FIG. 1. 7 (a) is a plan view schematically showing the skin facing surface side of another embodiment of the absorbent core according to the present invention, and FIG. 7 (b) is a sectional view taken along line II-II of FIG. 7 (a). It is a vertical sectional view schematically showing. 8 (a) to 8 (f) are plan views schematically showing the skin-facing surface side of the absorbent core according to the present invention on the rear side in the vertical direction.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. 1 to 4 show a basic configuration of a diaper 1 which is an example of a pants-type disposable diaper according to an embodiment of the absorbent article of the present invention. The diaper 1 has a vertical direction X corresponding to the front-back direction of the wearer and a lateral direction Y orthogonal to the vertical direction X, and a ventral portion A extending in the vertical direction X from the front and back of the inseam B and the inseam B. The crotch portion B is provided with an absorber 23 (absorbable core 24) having a dorsal side portion C and a liquid holding property. The inseam B is a portion arranged in the crotch part of the wearer when the diaper 1 is worn, and the ventral side A is the ventral side of the wearer, that is, the vertical direction X, rather than the crotch part B when the diaper 1 is worn. The dorsal side portion C is a portion arranged on the front side of the diaper, and the dorsal side portion C is a portion arranged on the dorsal side of the wearer, that is, the posterior side of the vertical direction X, rather than the inseam B in the wearing state of the diaper 1.

The diaper 1 includes an absorbent main body 2 provided with an absorbent body 23, and an outer body 3 arranged on a side farther from the wearer's body than the absorbent main body 2, and has a ventral side portion A and a dorsal side portion C. Both side edges AS and CS of the exterior body 3 along the vertical direction X in each are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal, and as shown in FIG. 1, a pair. The side seal portions S and S, the waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH and LH through which the wearer's lower limbs are passed are formed.

As shown in FIG. 2, the diaper 1 is a predecessor that covers the front side (ventral side) of the wearer's body in the wearing state with reference to the vertical center line CLx that divides the diaper 1 into two in the vertical direction X and extends in the horizontal direction Y. It is divided into a body F and a back body R that covers the back side (dorsal side) of the wearer's body in the wearing state. The ventral part A is a part of the front body F, the dorsal part C is a part of the back body R, and the inseam B extends over the front body F and the back body R. Both the ventral side portion A and the dorsal side portion C are portions at the same position as the side seal portion S in the vertical direction X, and are arranged around the waist including the waist portion of the wearer when the diaper 1 is worn. The inseam portion B is a region in which notches for forming leg openings LH and LH are formed on both side edges of the exterior body 3 along the vertical direction X.

The absorbent body 2 has a rectangular shape in a plan view in the unfolded and extended state of the diaper 1 as shown in FIG. 2, and extends in the longitudinal direction X from the ventral side A to the dorsal side C, and the longitudinal direction thereof. Is arranged at the center of the outer body 3 in the horizontal direction Y so as to coincide with the vertical direction X of the diaper 1 in the unfolded and stretched state, and is joined to the outer body 3 by an adhesive. The "expanded and extended state" of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the diaper 1 in the expanded state is extended with the elastic members of each part to have design dimensions (the influence of the elastic members is completely affected). It means the state of being expanded until it becomes the same as the dimensions when it is expanded in a plane with it removed.

As shown in FIG. 3, the absorbent main body 2 has a liquid-permeable surface sheet 21 that forms a skin-facing surface, and a liquid-impermeable, liquid-impermeable, or water-repellent back sheet 22 that forms a non-skin-facing surface. , And a liquid-retaining absorber 23 interposed between the sheets 21 and 22, and these are integrated by a known joining means such as an adhesive. The absorber 23 includes a liquid-retaining absorbent core 24 and a core wrap sheet 25 that covers the outer surface of the absorbent core 24 (both sides facing the skin and the non-skin facing surface). The absorbent core 24 and the core wrap sheet 25 are joined by a known joining means such as a hot melt type adhesive.

In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an absorbent core) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively of the wearer. The side close to the skin, and the "non-skin facing surface" is the surface of the absorbent article or its constituent members that faces the opposite side (clothing side) from the skin side when the absorbent article is worn, that is, relatively worn. The side far from the person's skin. In addition, "when worn" here means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained, and the absorbent article is in a state deviated from the wearing position. Does not include.

The absorbent core 24 has an hourglass shape in a plan view as shown in FIG. 5, that is, at the front end of the narrowest portion 240 having the shortest length in the horizontal direction Y in the vertical direction X, the horizontal direction Y is larger than that of the narrowest portion 240. The core front portion 241 having a long length is connected, and the core rear portion 242 having a longer lateral direction Y than the narrowest portion 240 is connected to the rear end of the vertical X of the narrowest portion 240. It has the shape of being. As shown in FIG. 2, the narrowest portion 240 of the absorbent core 24 is located in the inseam B. The core front portion 241 and the core rear portion 242 do not have the same length in the vertical direction X, and the core rear portion 242 is longer.

In the diaper 1, as shown in FIGS. 1 and 2, both ends in the vertical direction of the absorbent core 24, that is, the front end 24a and the rear end 24b in the vertical direction X are the same at the lower end Sb and the vertical direction X of the side seal portion S, respectively. It is located at a position or below the lower end Sb, that is, inward in the vertical direction X, that is, closer to the vertical center line CLx. In other words, the absorbent core 24 in the diaper 1 is the side of the side edge portion AS and the dorsal portion C of the ventral side portion A in the exterior body 3 in the plan view of the diaper 1 in the expanded and extended state as shown in FIG. It is arranged only in the inseam B, which is a region sandwiched between the edge CS, and is not arranged in the ventral side A and the dorsal side C located in front of and behind the vertical direction X of the inseam B. The total length of the absorbent core 24 in the vertical direction X is shorter than the total length of the crotch portion B in the vertical direction X.

In this type of absorbent article, the absorbent core usually extends from the ventral side A through the crotch B to the dorsal side C, so that the absorbent core 24 of the diaper 1 has the crotch B. It can be said that the configuration that fits inside is a characteristic configuration that is not found in conventional products. In the diaper 1, the absorbent core 24 having a relatively short vertical length is adopted, and the length of the vertical X of each of the ventral side A and the dorsal side C is made shorter than that of the conventional product, as a result. In the plan view in the expanded and extended state as shown in FIG. 2, the total length of the diaper 1 in the vertical direction X is shorter than that of the conventional product. When a diaper 1 having such a configuration is worn and clothing such as trousers is worn over the diaper 1, the waist portion of the diaper 1 is usually located lower than the waist portion of the clothing. The waist of the diaper 1 does not easily stick out, so that it is difficult for others to know that the diaper is being worn. The diaper 1 having such an effect is particularly useful as a disposable diaper for adults or nursing care.

As shown in FIG. 2, the core wrap sheet 25 covering the outer surface of the absorbent core 24 has a longer length in the vertical direction X than the absorbent core 24, and the front-rear end 24a of the absorbent core 24 in the vertical direction X, It extends outward from each of the 24bs in the vertical direction X, and is arranged not only on the inseam B but also on the ventral side A and the dorsal side C. The core wrap sheet 25 may be a single continuous sheet having a size capable of covering the entire outer surface of the absorbent core 24, or a single skin covering the skin facing surface of the absorbent core 24. It may be composed of a side core wrap sheet and one non-skin side core wrap sheet that covers the non-skin facing surface.

Like the core wrap sheet 25, the front surface sheet 21 and the back surface sheet 22 have a longer length in the vertical direction X than the absorbent core 24, and the vertical X from each of the front and rear ends 24a and 24b of the absorbent core 24 in the vertical direction X. It extends outwardly, and the extending portions are arranged on the ventral side A and the dorsal side C. In the present embodiment, the positions of the front and rear ends of the front surface sheet 21 and the back surface sheet 22 in the vertical direction X are the same as the positions of the front and rear ends of the core wrap sheet 25 in the vertical direction X.

As the absorbent core 24 and the core wrap sheet 25 constituting the front surface sheet 21, the back surface sheet 22, and the absorber 23, various types conventionally used for this type of absorbent article may be used without particular limitation. can. For example, various non-woven fabrics, perforated films and the like can be used as the front surface sheet 21, and a resin film or a laminate of a resin film and a non-woven fabric or the like can be used as the back surface sheet 22. The absorbent core 24 is a deposit of core forming material, including the absorbent material. As the absorbent material, those usually used as a material for forming this kind of absorbent core can be used without particular limitation, for example, hydrophilic fibers such as wood pulp and synthetic fiber treated with a hydrophilic agent, and water absorption. Examples include sex polymer particles. That is, the absorbent core 24 may be a laminated fiber of hydrophilic fibers, or a laminated fiber in which water-absorbing polymer particles are supported. As the core wrap sheet 25, a liquid permeable sheet such as paper or non-woven fabric can be used.

As shown in FIGS. 2 and 3, a pair of protective sheets made of a liquid-resistant or water-repellent and breathable sheet material are provided on both left and right sides of the absorbent body 2 on the skin-facing surface along the vertical direction X. Leakage cuffs 26 and 26 are provided. One or more thread-shaped elastic members 27 for forming a leak-proof cuff are arranged in an extended state in the vicinity of the free end of each leak-proof cuff 26. The leak-proof cuff 26 stands up at least in the inseam B when the elastic member 27 arranged in the extended state contracts when the diaper 1 is worn, whereby the excrement liquid such as urine flows out in the lateral direction Y. To prevent.

The exterior body 3 forms the outer shape of the diaper 1 in the expanded and extended state as shown in FIG. 2, and the peripheral edge of the exterior body 3 is the contour line of the diaper 1 in that state, that is, the ventral portion A, the inseam B, and the crotch portion B. The contour lines of each of the dorsal portions C are formed. As shown in FIG. 2, the exterior body 3 has a rectangular shape in the ventral portion A and the dorsal portion C in which the length in the lateral direction Y is longer than that in the vertical direction X, and the ventral portion A and the dorsal portion are formed. In the crotch portion B located between the crotch portion B, both side edges of the exterior body 3 along the vertical direction X, that is, a pair of leg edge portions LS and LS are curved in a convex arc shape toward the center in the lateral direction Y. In a plan view as shown in FIG. 2, the central region of the vertical direction X has an hourglass shape constricted inward in the horizontal direction Y.

As shown in FIGS. 3 and 4, the exterior body 3 has an outer layer sheet 31 that forms the outer surface of the diaper 1, that is, a non-skin facing surface, and an inner layer sheet that is arranged to face the skin facing surface 31a of the outer layer sheet 31 in a worn state. It is configured to include a laminated body with 32. In the wearing state of the diaper 1, the outer layer sheet 31 is located on the side far from the wearer's body to form the non-skin facing surface (outer surface) of the diaper 1, and the inner layer sheet 32 is located on the side closer to the wearer's body. Then, the skin-facing surface (inner surface) of the diaper 1 is formed. The outer layer sheet 31 and the inner layer sheet 32 are joined to each other at a predetermined portion via a joining means such as an adhesive. As shown in FIG. 4, the outer layer sheet 31 has a portion 31E extending from the edge of the inner layer sheet 32 in the vertical direction X on the ventral side portion A and the dorsal side portion C, and the extending portion 31E is shown in FIG. As shown in 2, the inner layer sheet 32 is folded back toward the skin facing surface and covers the end portion of the absorbent body 2 in the vertical direction X. Although the absorbent core 24 and the low basis weight region 4 which are the components of the absorbent main body 2 are not shown by broken lines in FIG. 4, the absorbent main body 2 has the same configuration as that of FIG. have.

In the present embodiment, as shown in FIG. 4, the inner layer sheet 32 is composed of one continuous sheet, while the outer layer sheet 31 is composed of a combination of a plurality of sheets. Specifically, the ventral outer layer sheet 31A constituting the ventral side portion A, the dorsal outer layer sheet 31C constituting the dorsal side portion C, and the inseam outer layer located between the two sheets 31A and 31C to form the inseam outer layer B. It is configured to include the sheet 31B. The ends of the sheets 31A, 31B, and 31C constituting the outer layer sheet 31 are overlapped with each other in the vertical direction X, and known bonding such as an adhesive, a heat seal, a high frequency seal, and an ultrasonic seal is performed at the overlapped portion. They are joined together by means and integrated. In the overlapping portion of the sheets 31A and 31C and the sheet 31B, the sheet 31B located at the center of the vertical direction X is located relatively close to the absorbent main body 2, and both ends of the sheet 31B in the vertical direction X are located. The non-skin facing surface of the portion is covered with the sheets 31A and 31C.

The sheets 31 (31A, 31B, 31C) and 32 constituting the exterior body 3 may be the same type of sheets or different types of sheets, and examples of the latter include forms having different elasticity. Specifically, for example, as the ventral outer layer sheet 31A and the dorsal outer layer sheet 31C, an elastic sheet having elasticity in the lateral direction Y is used, and the remaining portion of the outer layer sheet 31, that is, the inseam outer layer sheet 31B and the inner layer sheet 32. Can use a non-stretchable sheet that does not have elasticity. Examples of the stretchable sheet that can be used as the exterior body 3 include a stretchable sheet in which an stretchable fiber layer is integrated on both sides or one side of the elastic fiber layer, and the elastic fiber layer and the stretchable fiber layer are included. Examples of the method of integration with the fiber include a method of laminating and entwining the two with water flow, a method of entwining the fibers by air through, and a method of joining by heat embossing, an adhesive, ultrasonic waves, or the like. Examples of the non-stretchable sheet that can be used as the exterior body 3 include non-woven fabrics produced by various manufacturing methods, and specific examples thereof include spunbonded non-woven fabrics, air-through non-woven fabrics, and needle-punched non-woven fabrics.

The exterior body 3 includes a waist elastic member 33 that forms waist gathers at the opening edge of the waist opening WH. That is, one or more (plural in this embodiment) waist elastic member 33 for forming waist gathers in and near the opening edge of the waist opening WH in each of the ventral side A and the dorsal side C. Are arranged in an extended state over the entire length of the lateral direction Y, whereby a substantially continuous annular waist gather is formed at the opening edge and its vicinity thereof over the entire circumference thereof.
Further, the exterior body 3 is one or a plurality of leg elastic members arranged in an extended state on the back body R as leg elastic members forming leg gathers at the opening edges of each of the pair of leg openings LH and LH (in the present embodiment). A plurality of) rear leg elastic members 34 are provided. In the diaper 1, the front leg elastic member is not arranged on the front body F, but the front leg elastic member may be arranged on the front body F, and the front leg elastic member is the rear leg elastic member. The arrangement form can be the same as that of 34.
The waist elastic member 33 and the rear leg elastic member 34 are thread-shaped or band-shaped, respectively, and are sandwiched and fixed between the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 by an adhesive.

Hereinafter, the absorbent core 24, which is one of the main features of the diaper 1, will be described in detail. As shown in FIG. 5, the absorbent core 24 is located in the vertical center of the diaper 1, that is, in the region behind the vertical center line CLx, in the horizontal direction Y from the front side to the rear side of the vertical direction X. Has a posterior first region 243 in which the length (ie, width) of the diaper gradually increases. Further, the absorbent core 24 has a rear second region 244 connected to the rear end of the longitudinal direction X of the rear first region 243. As described above, the absorbent core 24 has the core front portion 241, the narrowest portion 240, and the core rear portion 242 in this order from the front side in the vertical direction X, whereas the core rear portion 242 has the rear first region 243. And the rear second region 244 are included. That is, each portion of the absorbent core 24 is arranged in the vertical direction X in the order of the core front portion 241, the narrowest portion 240, the rear first region 243, and the rear second region 244 from the front side in the vertical direction X. .. The outer shape (contour line) of the absorbent core 24 is formed symmetrically on one side and the other side with reference to the horizontal center line CLi extending in the vertical direction X by dividing the absorbent core 24 into two in the horizontal direction Y. There is.

As shown in FIG. 5, the narrowest portion 240 is a region having a predetermined length in the vertical direction X and a region having a constant length in the horizontal direction Y. That is, the side edges 240L and 240L along the vertical direction X of the narrowest portion 240 are parallel to the vertical direction X, respectively. The narrowest portion 240 is located at the center of the diaper 1 in the vertical direction, that is, at the vertical center line CLx.

The posterior first region 243 is arranged at a position in the absorbent core 24 that can correspond to a portion from the wearer's excretory part (penis or the like) to the buttocks. The front end of the rear first region 243 in the vertical direction X (the boundary between the narrowest portion 240 and the rear first region 243) is substantially at the same position as the portion facing the excretion portion of the wearer (excretion portion facing portion). The excretory portion facing portion is usually located at the center of the vertical direction X, that is, on the vertical center line CLx, or at a position slightly deviated to the front side of the vertical center line CLx. Further, the rear end of the rear first region 243 in the vertical direction X (the boundary between the rear first region 243 and the rear second region 244) is abbreviated as a portion closer to the anterior side of the crack (intergluteal cleft) in the wearer's buttocks. It is in the same position. Both side edges 243L and 243L along the vertical direction X of the rear first region 243 extend in directions intersecting both the vertical direction X and the horizontal direction Y in a plan view as shown in FIG. 5, respectively, and are the narrowest portions. From the boundary between 240 and the rear first region 243 (core rear portion 242), it extends diagonally outward in the horizontal direction Y and toward the rear in the vertical direction X.

As shown in FIG. 5, the rear second region 244 has a smaller change in the length of the lateral Y in the vertical direction X than the rear first region 243 located on the front side thereof. In the diaper 1, the length of the rear second region 244 in the horizontal direction Y is constant, and the length of the horizontal direction Y does not change in the vertical direction X. That is, both side edges 244L and 244L along the vertical direction X of the rear second region 244 are parallel to the vertical direction X, respectively. However, the rear second region 244 may have a small change in the length, that is, the width in the lateral direction in comparison with the rear first region 243, and if that condition is satisfied, the width of the rear second region 244 may be small. May change in the vertical direction X, that is, the side edge 244L of the rear second region 244 may be a straight line extending in a direction intersecting both the vertical direction X and the horizontal direction Y in a plan view, or may be a curved line. .. The rear second region 244 has a longer length in the vertical direction X than the rear first region 243.

As shown in FIGS. 2 and 5, the absorbent core 24 has a non- or low-deposited portion 40 in which the material for forming the absorbent core 24 is not present or the forming material is less than that in the peripheral portion. , A plurality of low basis weight regions 4 are formed. The non-deposited portion 40 is a region in which the material for forming the absorbent core 24 does not exist, and the low-deposited portion 40 is a region in which the material for forming the absorbent core 24 is less than the peripheral portion of the absorbent core 24. Is. The absorbent core according to the present invention may have either a non-deposited portion or a low-deposited portion, and these are collectively referred to as "non-deposited portion" in the present specification. In the diaper 1, as shown in the figure, four low basis weight regions 4 are formed in the absorbent core 24, and the plurality of low basis weight regions 4 are intermittently arranged at predetermined intervals in the vertical direction X. There is. The plurality of low basis weight regions 4 are portions extending diagonally from the central portion of the absorbent core 24 in the lateral direction Y to the outside in the lateral direction Y and toward the front in the longitudinal direction X, respectively, in a plan view as shown in FIG. have. The shapes and dimensions of the plurality of low basis weight regions 4 in a plan view are the same as each other. The plurality of low basis weight regions 4 are formed symmetrically on one side and the other side with respect to the horizontal center line CLi.

In the diaper 1, each of the plurality of low basis weight regions 4 has only one non- or low basis weight portion 40, and the one non-or low basis weight region 40 has the low basis weight region 4 as shown in FIG. It is continuous from one end to the other end in the lateral direction Y of. More specifically, each of the plurality of low basis weight regions 4 is formed so that one non-or low-deposited portion 40, which is a component thereof, extends in the lateral direction Y so as to have a longitudinal direction, and is shown in FIG. In a plan view as shown, a plan view in which the center 4a of the low basis weight region 4, that is, one non-or low-deposited portion 40 in the lateral direction Y is located behind both ends 4b and 4b in the lateral direction X in the vertical direction X. It has a shape, and more preferably, it has a plan view shape that is convexly curved toward the rear end 24b of the vertical direction X of the absorbent core 24.

In the present invention, it is sufficient that one or more non- or low-deposited portions are present in one low basis weight region, and one is used as shown in FIGS. 8 (a) to 8 (c) described later. A plurality of non- or low-deposited portions may be intermittently arranged in the lateral direction Y in the low basis weight region of the above. When a plurality of non- or low-deposited portions are formed symmetrically on one side and the other side with respect to the lateral center line CLi, all of the plurality of non- or low-deposited portions having a symmetric relationship and their spacing ( The region having the smallest area in one continuous region including the non- or low-deposited portion) is the low basis weight region. For example, in the form shown in FIG. 8B, two non-or low-deposited portions 40C having a rectangular shape in a plan view are formed symmetrically with respect to the horizontal center line CLi, and these two non-or low deposits are formed. One continuous V-shaped region in a plan view, including the deposition portion 40C and the distance between the two, is the low basis weight region 4C. In the form shown in FIG. 8B, four such V-shaped low basis weight regions 4C are formed. In FIGS. 8 (a) to 8 (c), a region including a plurality of non- or low-deposited portions surrounded by a dotted line is one low basis weight region.

One of the main features of the absorbent core 24 is that the following 1) to 5) are integrally adopted. Due to these characteristics, the absorbent core 24 is deformed as shown in FIG. 6 when the diaper 1 is worn, the portion located behind the vertical center line CLx or its vicinity in the vertical direction X is deformed. Specifically, in the absorbent core 24, the rear first region 243, and in some cases, the portion closer to the rear first region 243 in the narrowest portion 240, is non-skinned with the lateral center line CLi as a folding curve. It is deformed into a mountain fold with the facing surface inside, that is, it is deformed into an inverted V shape in a cross-sectional view along the lateral direction Y to form a raised portion 245 that is convex toward the skin facing surface, and the raised portion 245 is formed. While fitting to the wearer's intergluteal cleft, the posterior second region 244 is deformed into a concave concave shape toward the wearer's skin side so as to follow the curved shape of the wearer's buttocks and adheres to the buttocks. Further, there is a concern that the absorbent core 24 is deformed in this way to form wrinkles that may hinder the fit, particularly in the rear portion 242 of the core. It is wiped out by the presence of the basis weight area 4. Therefore, the diaper 1 has a fit to the buttocks because the portion corresponding to the buttocks of the wearer can be deformed to fit the outer shape of the buttocks and adhere to the skin of the wearer while suppressing the occurrence of wrinkles. Is excellent.

1) In the vertical center of the diaper 1, that is, the region behind the vertical center line CLx, the length of the horizontal direction Y gradually increases from the front side to the rear side of the vertical direction X in the rear first region. Has 243.
2) It has a rear second region 244 that is connected to the rear end of the rear first region 243 in the vertical direction X and has a smaller change in the length of the lateral Y in the vertical direction X than the rear first region 243.
3) A plurality of low basis weight regions 4 extending in the lateral direction Y are formed in the absorbent core 24 (core rear portion 242).
4) At least a part of the plurality of low basis weight regions 4 is present in the rear first region 243.
5) The low basis weight region 4 has a portion extending diagonally from the central portion of the absorbent core 24 in the lateral direction Y to both outer sides in the lateral direction Y and toward the front in the vertical direction X in a plan view.

When wearing the diaper 1, an external force caused by the movement of the wearer's body, for example, a compressive force from the lateral direction Y caused by the diaper 1 being sandwiched by a pair of thighs of the wearer acts on the absorbent core 24. In this case, the stress (deformation force) generated in the absorbent core 24 in response to the action of the external force is concentrated in the rear first region 243 by adopting the above 1) and 2), and other than the rear first region 243. It is relaxed in other parts. Further, in the rear first region 243 where the deforming force is easily concentrated, there is a low basis weight region 4 which is less rigid and easily deformed than the other parts of the absorbent core 24 by adopting the above 4). The deformation force along the wearer's intergluteal cleft is likely to act on the low basis weight region 4. Therefore, when the diaper 1 is worn, as shown in FIG. 6, the mountain fold deformation of the rear first region 243 easily occurs, and when the deformation occurs, unnecessary wrinkles that can reduce the fit are unlikely to occur. ..

Further, in order to improve the fit of the diaper 1 to the buttocks, it is not enough that the raised portion 245 is formed in the rear first region 243 of the absorbent core 24 and fits the wearer's intergluteal cleft. The rear second region 244, which corresponds to the majority, needs to be deformed into a concave concave shape toward the buttocks so as to follow the curved shape of the buttocks. Then, for that purpose, the vertical deformation force of bending in the vertical direction X with the skin facing surface inside and the lateral Y mainly along the wearer's buttocks with the skin facing surface inside with respect to the rear second region 244. It is necessary that the lateral deformation force to bend the skin acts with an appropriate strength. In this respect, in the diaper 1, since the plurality of low basis weight regions 4 existing in the core rear portion 242 all extend in the lateral direction Y due to the adoption of the above 3), the vertical deformation force is the said concave deformation. Is moderately suppressed to the extent possible. Further, by adopting the above 5), since all of the plurality of low basis weight regions 4 have a specific plan view shape inclined with respect to both the vertical direction X and the horizontal direction Y, the lateral deformation force is promoted. Will be done. Therefore, the rear second region 244 is deformed in a concave shape along the curved surface shape of the buttocks, and as a result, the corner portion on the longitudinal rear end side of the absorbent core, which is difficult to fit the wearer's body with the conventional product, is formed. Even the located portion (in FIG. 6, designated by reference numeral 24RC) may fit the wearer's buttocks. Further, since the rear second region 244 has a longer length in the vertical direction X than the rear first region 243, it is easily deformed along the curved surface shape of the buttocks, and the fit to the buttocks is improved. It will lead to further improvement.

Further, when the rear first region 243 is deformed into a mountain fold and the rear second region 244 is similarly deformed into a mountain fold following this, the fit to the buttocks may be deteriorated. In this respect, in the diaper 1, by adopting the above 2), the rear second region 244 is configured to have a smaller change in the length in the lateral direction than the rear first region 243, so that the mountain fold is formed. It is said to be an area that is difficult to do. Therefore, the rear second region 244 is likely to be deformed in a concave shape along the curved surface shape of the buttocks due to the combination of such a characteristic that the mountain is difficult to be folded and the above-mentioned appropriate control of the vertical deformation force and the lateral deformation force. It has become a thing.

In the diaper 1, as shown in FIG. 5, a low basis weight region 4 (non-or low sedimentation portion 40) exists not only in the rear first region 243 but also in the rear second region 244. Therefore, the concave deformation of the rear second region 244 described above is more likely to occur, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, as shown in FIG. 5, the non- or low-deposited portion 40 constituting the low basis weight region 4 extends in the lateral direction Y across the lateral center line CLi. Therefore, the wrinkles of the absorbent core 24, which may occur mainly when the absorbent core 24 is deformed mainly by the vertical deformation force, are further reduced, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, as shown in FIG. 5, the low basis weight region 4 has only one non- or low basis weight portion 40, and the one non- or low basis weight portion 40 is lateral to the low basis weight region 4. It is continuous from one end to the other end in the direction Y. Therefore, the distortion in the lateral direction Y due to the twist of the absorbent core 24 is alleviated, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, the non-or low-deposited portion 40 constituting the low basis weight region 4 is a through hole penetrating the absorbent core 24 in the thickness direction, and the skin-facing surface and the non-skin facing surface of the absorbent core 24. An opening is formed at the formation position of the non-or low-deposited portion 40 in each. That is, the material for forming the absorbent core 24 does not exist in the low basis weight region 4 of the diaper 1. Therefore, the degree of freedom of movement of the absorbent core 24 is high, and the above-mentioned deformation is likely to occur, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, as shown in FIG. 5, both ends 4b and 4b of each of the plurality of low basis weight regions 4 in the lateral direction Y have the shortest length in the lateral direction Y, that is, the widest width in the absorbent core 24. Both ends of the narrow portion 240 in the horizontal direction Y (side edges along the vertical direction X) are located on the outer side of the horizontal direction Y from 240L and 240L. Therefore, the core rear portion 242 having the plurality of low basis weight regions 4 is more likely to be deformed along the buttocks, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, as shown in FIG. 5, both ends of each of the plurality of low basis weight regions 4 in the lateral direction Y (the lateral end 4b of the low basis weight region 4 and its vicinity) each have a tapered shape in a plan view. Is doing. Therefore, when the rear portion 242 of the core is deformed, wrinkles are effectively suppressed in the peripheral portion of the lateral end 4b of the low basis weight region 4, which leads to further improvement of the fit to the buttocks.

Further, in the diaper 1, the absorbent core 24 is connected to the core front portion 241 and the core rear portion 242 wider than the narrowest portion 240 before and after the narrowest portion 240 in a plan view as shown in FIG. This is because it has an hourglass shape, that is, it is arranged in the order of the core front portion 241, the narrowest portion 240, the rear first region 243, and the rear second region 244 from the front side in the vertical direction X. Combined with the characteristic configuration such as the presence of the low basis weight region 4, the absorbency and the fit are compatible at a high level. Further, as shown in FIG. 2, the narrowest portion 240 of the absorbent core 24 is a region located at the center of the vertical direction X of the diaper 1 (vertical center line CLx) and having a predetermined length in the vertical direction X. Since both side edges of the narrowest portion 240 along the vertical direction are parallel to each other in the vertical direction, deformation in the narrowest portion 240 is less likely to occur than deformation in the rear second region 244. Therefore, the rear second region 244 is not so affected by the deformation of the narrowest portion 240, and tends to be deformed in a concave shape along the curved shape of the buttocks.

In particular, the diaper 1 has more than both side edges 240L and 240L of the narrowest portion 240 in which both ends 4b and 4b of each of the plurality of low basis weight regions 4 in the horizontal direction Y are located at the center of the vertical direction X, that is, the vertical center line CLx. It is located outside the lateral direction Y. Therefore, in the narrowest portion 240, a ridge portion 245 is formed as shown in FIG. 6, and the ridge portion 245 fits the wearer's intergluteal cleft, and the core rear portion 242 having a plurality of low basis weight regions 4 is present. Is more likely to be deformed along the buttocks, leading to further improvement in the fit to the buttocks.

In the present embodiment, as shown in FIG. 2, the rear leg elastic member 34 is arranged so as to intersect each of both side portions of the absorbent core 24 along the vertical direction X. More specifically, the rear leg elastic member 34 is arranged so as to intersect each of both side portions of the absorbent core 24 along the longitudinal direction X of the rear second region 244 (see FIG. 5). That is, the rear leg elastic member 34 extends from the side seal portion S along the side edge of the absorbent core 24 along the vertical direction X. With such a configuration, the stress that the rear leg elastic member 34 contracts outward in the vertical direction X of the dorsal side portion C pulls the core rear portion 242 outward in the vertical direction X of the dorsal side portion C. The portion on the rear end 24b side of the core rear portion 242, that is, the rear second region 244 can be easily warped, which leads to further improvement of the fit to the buttocks.

From the viewpoint of ensuring that the above-mentioned action and effect of the absorbent core 24 are more reliably exerted, it is preferable to set the dimensions and the like of each part of the absorbent core 24 as follows.
The ratio of the length of the rear first region 243 to the total length of the absorbent core 24 in the vertical direction X is preferably 9% or more, more preferably 15% or more, and preferably 30% or less. More preferably, it is 20% or less.
The length of the rear first region 243 in the vertical direction X is preferably 55 mm or more, more preferably 65 mm or more, and preferably 95 mm or less, still more preferably 85 mm or less.
The ratio of the length of the rear second region 244 to the total length of the absorbent core 24 in the vertical direction X is preferably 10% or more, more preferably 15% or more, and preferably 55% or less. More preferably, it is 45% or less.
The length of the rear second region 244 in the vertical direction X is preferably 40 mm or more, more preferably 65 mm or more, and preferably 200 mm or less, still more preferably 160 mm or less.
The length, that is, the width of the narrowest portion 240 in the lateral direction is preferably 40 mm or more, more preferably 80 mm or more.
The length or width of the rear second region 244 in the lateral direction Y is preferably 60 mm or more, more preferably 120 mm or more, and preferably 200 mm or less, still more preferably 140 mm or less.

The basis weight (weight) of the absorbent core 24 is preferably 100 g / m ² or more, more preferably 200 g / m ² or more, and preferably 600 g / m ² or less, still more preferably 400 g / m ² or less.
The thickness of the absorbent core 24 under no load is preferably 1 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, still more preferably 10 mm or less.

The length of the low basis weight region 4 in the lateral direction Y is preferably 20 mm or more, more preferably 40 mm or more, and preferably 120 mm or less, still more preferably 100 mm or less.
The width of the low basis weight region 4, that is, the length in the direction orthogonal to the extending direction of the low basis weight region 4, is preferably 1 mm or more, more preferably 3 mm or more, and preferably 50 mm or less, further preferably 10 mm or less.
In the diaper 1, since one non- or low-deposited portion 40 is continuous from one end of the lateral Y of the low basis weight region 4 to the other end, the length of each portion of the low basis weight region 4 is not. Or equal to the length of each part of the low sedimentation part 40.
The distance between the two adjacent low basis weight regions 4 and 4 in the vertical direction X is preferably 2 mm or more, more preferably 10 mm or more, and preferably 50 mm or less, still more preferably 20 mm or less.
The number of low basis weight regions 4 in the absorbent core 24 is preferably 2 or more, more preferably 4 or more, and preferably 40 or less, still more preferably 15 or less.

The angle of the side edge 243L of the rear first region 243 with respect to the lateral direction Y, that is, the inclination angle θ1 (see FIG. 5) of the rear first region 243 is preferably 30 ° or more, more preferably 60 ° or more, and preferably preferably. It is less than 90 °, more preferably 80 ° or less.
The angle θ2 (see FIG. 5) formed by the side edge 243L of the rear first region 243 or its extension line and the extension line of the low basis weight region 4 is preferably 30 ° or more, more preferably 60 ° or more, and preferably preferably. It is 150 ° or less, more preferably 80 ° or less.

Hereinafter, other embodiments of the present invention will be described with reference to FIGS. 7 and 8. Regarding other embodiments described later, components different from the above-mentioned diaper 1 (absorbent core 24) will be mainly described, and similar components will be designated by the same reference numerals and description thereof will be omitted. The description of the diaper 1 is appropriately applied to the components not particularly described.

In the absorbent core 24A shown in FIG. 7, the non-or low-deposited portion 40 constituting the low basis weight region 4 is a recess having a bottom as shown in FIG. 7 (b), and is a skin facing surface of the absorbent core 24A. It is a low-deposited portion 40 having an opening in 24S1. In the case of such a low-deposited portion 40 having a recess instead of a through hole, the opening of the recess is formed on the non-skin facing surface 24S2 of the absorbent core 24A, contrary to the form shown in FIG. 7 (b). However, considering the ease of deformation of the core rear portion 242 described above, it is formed on the skin facing surface 24S1 of the absorbent core 24A as shown in FIG. 7 (b). Is preferable. The most preferable non-or low-deposited portion 40 is a through hole.

Further, the absorbent core 24A shown in FIG. 7 has a longer length in the vertical direction X of the core front portion 241 than the absorbent core 24 shown in FIG. Therefore, when the absorbent core 24A is applied in place of the absorbent core 24 in the diaper 1, the absorbent core 24A in the diaper 1 extends from the inseam B to the ventral side A, and the absorbent core 24A extends from the inseam B to the ventral side A. The front end 24a in the vertical direction X is located above the lower end Sb (see FIGS. 1 and 2) of the side seal portion S, that is, outside the vertical direction X.

FIG. 8 illustrates a pattern of a low basis weight region that can be obtained in the present invention.
In the embodiment shown in FIG. 8A, the core rear portion 242 has a low basis weight region 4A (first low basis weight region) having only one non- or low-deposited portion 40A, and a plurality (two) non- or A low basis weight region 4B (second low basis weight region) having a low basis weight portion 40B is mixed. One low basis weight region 4A is arranged at the rearmost position of the core rear portion 242, and three low basis weight regions 4B are arranged on the front side in the vertical direction X with respect to the low basis weight area 4A. Further, in the three low basis weight regions 4B, the intervals between the plurality of non- or low basis weight portions 40B and 40B constituting the low basis weight region 4B are different from each other, and specifically, they are located at the center of the vertical direction X. The interval in the low basis weight region 4B is shorter than the interval in the other low basis weight regions 4B. Further, the non-or low-deposited portion 40A has a plan-view shape that is convexly curved toward the rear end 24b of the absorbent core in a plan view, and the non-or low-deposit portion 40B has a rectangular shape in a plan view. Therefore, each of the low basis weight regions 4A and 4B has a constant width, that is, a length in a direction orthogonal to the extending direction of the low basis weight region, and does not have a tapered shape as in the low basis weight region 4 shown in FIG. However, from the viewpoint of suppressing the generation of wrinkles due to the deformation of the rear portion 242 of the core, it is preferable that the plan view shape of the low basis weight region is a tapered shape as shown in FIG.

In the form shown in FIG. 8 (b), each of the low basis weight regions 4C formed in the rear portion 242 of the core has a plurality (two) non-or low-deposited portions 40C having a rectangular shape in a plan view and is flat. The width is constant in the visual sense and it is not a tapered shape.
In the embodiment shown in FIG. 8 (c), each of the low basis weight regions 4D formed in the rear portion 242 of the core has a plurality of (8) non- or low-deposited portions 40D having a square shape or a quadrangular shape in a plan view. Moreover, the width is constant in a plan view and the shape is not tapered.
In the form shown in FIG. 8 (b) , there is no non-or low-deposited portion 40C extending in the lateral direction Y across the horizontal center line CLy, and also in the form shown in FIG. 8 (c), the horizontal center line CLy. There is no non-or low sedimentation portion 40D extending laterally Y across. On the other hand, in the form shown in FIG. 5, all of the plurality (4) non-or low-deposited portions 40 extend in the lateral direction Y across the lateral center line CLi, and are also shown in FIG. 8 (a). Also in the form, one non-or low-deposited portion 40A extends in the lateral direction Y across the horizontal center line CLy, and due to such a difference in configuration, the form shown in FIGS. 5 and 8 (a). Can more effectively prevent the formation of wrinkles in the absorbent core.

The form shown in FIG. 8D is different from the form shown in FIG. 5 in that the plan view shape of the low basis weight region 4E (non-or low deposition portion 40E) is not a tapered shape.
The form shown in FIG. 8 (e) is different from the form shown in FIG. 5 in that the shapes and / or dimensions of a plurality of (4) low basis weight regions 4F (non-or low-deposited portions 40F) in a plan view are different from each other. Specifically, the closer the distance from the rear end 24b of the absorbent core is, the longer the length in the lateral direction Y is.
In the form shown in FIG. 8 (f), in addition to the point that the plan view shape of the low basis weight region 4G (non- or low deposition portion 40G) is not a tapered shape, the portion straddling the lateral center line CLi is bent without being curved. This is also different from the form shown in FIG.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified. For example, the low basis weight region may be present in at least the rear first region, and all of the plurality of low basis weight regions may be present in the rear first region. Further, a non-deposited portion formed of a through hole and a low-deposited portion formed of a recess as shown in FIG. 7B may coexist. All the parts of only one embodiment described above can be mutually used as appropriate. Further, the following additional notes will be disclosed with respect to the above-described embodiment of the present invention.

<1>
It has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and the inseam arranged in the crotch part of the wearer, and the ventral side and the back extending vertically from the front and back of the crotch part. An absorbent article having a side portion and an absorbent core having a liquid holding property arranged in the inseam.
The absorbent core has a posterior first region in which the lateral length gradually increases from the vertical front side to the rear side in the region posterior to the vertical center of the absorbent article. It has a posterior second region that is connected to the longitudinal rear end of the posterior first region and has a smaller change in lateral length in the longitudinal direction than the posterior first region.
A plurality of low basis weight regions are formed in the absorbent core, in which the material for forming the absorbent core is not present or the forming material is less than the peripheral portion and the non- or low-deposited portion is formed. Each of the low basis weight regions has a portion extending diagonally from the lateral central portion of the absorbent core to both laterally outward and longitudinally forward in a plan view.
An absorbent article in which at least a part of the plurality of low basis weight regions is present in the rear first region.

<2>
The absorbent article according to <1>, wherein the low basis weight region is present in the rear second region.
<3>
At least one of the plurality of low basis weight regions is such that the non-or low sedimentation portion extends laterally across the lateral centerline that laterally bisects the absorbent core. The absorbent article according to <1> or <2>.
<4>
The absorbent article according to <3>, wherein the portion of the non-or low-deposited portion that straddles the lateral center line is bent without being curved.
<5>
At least one of the plurality of low basis weight regions is any one of the above <1> to <4> in which one non- or low basis weight portion is continuous from one end to the other end in the lateral direction of the low basis weight region. Or the absorbent article according to item 1.
<6>
The absorbent article according to any one of <1> to <5>, wherein the non-or low-deposited portion is a through hole penetrating the absorbent core in the thickness direction.

<7>
The absorbent article according to any one of <1> to <6>, wherein both ends of the low basis weight region in the lateral direction each have a tapered shape in a plan view.
<8>
In the rear first region and the rear second region, as the low basis weight region, a first low basis weight region having only one non- or low basis weight portion and a second low basis weight having a plurality of the non- or low basis weight portions. The basis weight area is mixed, and one of the first low basis weight areas is arranged at the rearmost position of the rear portion of the core, and the second low basis weight area is in the vertical direction with respect to the first low basis weight area. The absorbent article according to any one of <1> to <6>, which is arranged on the front side.
<9>
A plurality of the low basis weight regions are formed in the rear first region and the rear second second region, and each of the plurality of low basis weight regions has a plurality of the non-or low-deposited portions having a rectangular shape in a plan view and is viewed in a plan view. The absorbent article according to any one of <1> to <6>, wherein the width is constant and the shape is not tapered.
<10>
A plurality of the low basis weight regions are formed in the rear first region and the rear second second region, and each of the plurality of low basis weight regions has a constant width, that is, a length in a direction orthogonal to the extending direction of the low basis weight region. The absorbent article according to any one of <1> to <6>, which is present and does not have a tapered shape in a plan view.

<11>
A plurality of the low basis weight regions are formed in the rear first region and the rear second second region, and the plurality of low basis weight regions have different shapes and / or dimensions in a plan view from the above <1> to <10>. The absorbent article according to any one of the above items.
<12>
The lateral ends of the low basis weight region are located laterally outward from the lateral ends of the narrowest portion having the shortest lateral length in the absorbent core. The absorbent article according to any one item.
<12>
In a plan view, the absorbent core is connected to the narrowest portion having the shortest lateral length and the front end in the vertical direction of the narrowest width, and the front of the core having a longer lateral length than the narrowest portion. The <1> to < The absorbent article according to any one of 11>.
<13>
The absorbent article according to <12>, wherein the lateral length of the narrowest portion is preferably 40 mm or more, more preferably 80 mm or more.
<14>
The narrowest portion is a region located in the center of the absorbent article in the vertical direction and having a predetermined length in the vertical direction, and both side edges of the narrowest portion along the vertical direction are in the vertical direction. The absorbent article according to <12> or <13>, which is parallel to each other.
<15>
The absorbent article according to <14>, wherein both ends of the low basis weight region in the lateral direction are located laterally outward from the side edges along the vertical direction of the narrowest portion.

<16>
1. The absorbent article according to any one item.
<17>
In the absorbent article, both side edges of the exterior body along the vertical direction of the ventral portion and the dorsal portion are joined to form a pair of side seal portions, a waist opening portion, and a pair of leg openings. The absorbent article according to <16>, which is a pants-type absorbent article.
<18>
The above-mentioned <17>, wherein the front end and the rear end in the vertical direction of the absorbent core are placed at the same position in the vertical direction with the lower end of the side seal portion, respectively, or are located inward in the vertical direction from the lower end. Absorbent article.
<19>
The core wrap sheet has a longer vertical length than the absorbent core, extends outward in the vertical direction from each of the vertical front and rear ends of the absorbent core, and also extends to the ventral side and the dorsal side. The absorbent article according to any one of the above <16> to <18>.

<20>
The absorbency according to any one of <1> to <19>, wherein the posterior first region is arranged at a position corresponding to a portion from the wearer's excretory portion to the buttocks in the absorbable core. Goods.
<21>
The absorbent article according to any one of <1> to <20>, wherein the lateral length of the rear second region is constant.
<22>
The absorbent article according to any one of <1> to <21>, wherein the rear second region has a longer vertical length as compared with the rear first region.
<23>
The absorbent article according to any one of <1> to <22>, wherein the low basis weight region has a plan view shape that is convexly curved toward the longitudinal rear end of the absorbent core.

<24>
The ratio of the longitudinal length of the rear first region to the overall length of the absorbent core is preferably 9% or more, more preferably 15% or more, and preferably 30% or less, still more preferably. The absorbent article according to any one of <1> to <23>, which is 20% or less.
<25>
The vertical length of the rear first region is preferably 55 mm or more, more preferably 65 mm or more, and preferably 95 mm or less, further preferably 85 mm or less, any one of the above <1> to <24>. Absorbent article described in.
<26>
The ratio of the longitudinal length of the rear second region to the overall length of the absorbent core is preferably 10% or more, more preferably 15% or more, and preferably 55% or less, still more preferably. The absorbent article according to any one of <1> to <25>, which is 45% or less.
<27>
The vertical length of the rear second region is preferably 40 mm or more, more preferably 65 mm or more, and preferably 200 mm or less, further preferably 160 mm or less, any one of the above <1> to <26>. Absorbent article described in.
<28>
The lateral length of the rear second region is preferably 60 mm or more, more preferably 120 mm or more, and preferably 200 mm or less, further preferably 140 mm or less, any one of the above <1> to <27>. Absorbent article described in.
<29>
The basis weight of the absorbent core is preferably 100 g / m ² or more, more preferably 200 g / m ² or more, and preferably 600 g / m ² or less, still more preferably 400 g / m ² or less. The absorbent article according to any one of <28>.
<30>
The thickness of the absorbent core under no load is preferably 1 mm or more, more preferably 3 mm or more, and preferably 15 mm or less, further preferably 10 mm or less, any one of the above <1> to <29>. Absorbent article described in.

<31>
The lateral length of the low basis weight region is preferably 20 mm or more, more preferably 40 mm or more, and preferably 120 mm or less, further preferably 100 mm or less, according to any one of <1> to <30>. The absorbent article described.
<32>
The width of the low basis weight region, that is, the length in the direction orthogonal to the extending direction of the low basis weight region is preferably 1 mm or more, more preferably 3 mm or more, and preferably 50 mm or less, still more preferably 10 mm or less. The absorbent article according to any one of <1> to <31>.
<33>
The distance between the two adjacent low basis weight regions in the vertical direction is preferably 2 mm or more, more preferably 10 mm or more, and preferably 50 mm or less, still more preferably 20 mm or less. The absorbent article according to any one of the above items.
<34>
The number of the low basis weight regions in the absorbent core is preferably 2 or more, more preferably 4 or more, and preferably 40 or less, still more preferably 15 or less. The absorbent article according to any one of the above items.
<35>
The angle of the lateral edge of the rear first region along the longitudinal direction, that is, the inclination angle of the rear first region is preferably 30 ° or more, more preferably 60 ° or more, and preferably less than 90 °. The absorbent article according to any one of <1> to <34>, which is more preferably 80 ° or less.
<36>
The angle formed by the side edge along the vertical direction of the rear first region or the extension line thereof and the extension line of the low basis weight region 4 is preferably 30 ° or more, more preferably 60 ° or more, and preferably 150 °. Hereinafter, the absorbent article according to any one of <1> to <35>, which is more preferably 80 ° or less.

1 Pants-type disposable diaper (absorbent article)
2 Absorbent body 21 Front surface sheet 22 Back surface sheet 23 Absorbent 24, 24A Absorbent core 240 Narrowest part 241 Core front part 242 Core rear part 243 Rear first area 244 Rear second area 245 Raised part 25 Core wrap sheet 3 Exterior 31 Outer layer sheet 32 Inner layer sheet 4, 4A to 4G Low basis weight area 40, 40A to 40G Non-or low sedimentation part A Ventral part B Crotch part C Dorsal side S Side seal part X Vertical direction Y Lateral direction

Claims (10)

It has a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and the inseam arranged in the crotch part of the wearer, and the ventral side and the back extending vertically from the front and back of the crotch part. An absorbent article having a side portion and an absorbent core having a liquid holding property arranged in the inseam.
The absorbent core has a posterior first region in which the lateral length gradually increases from the vertical front side to the rear side in the region posterior to the vertical center of the absorbent article. It has a posterior second region that is connected to the longitudinal rear end of the posterior first region and has a smaller change in lateral length in the longitudinal direction than the posterior first region.
A plurality of low basis weight regions are formed in the absorbent core, in which the material for forming the absorbent core is not present or the forming material is less than the peripheral portion and the non- or low-deposited portion is formed. Each of the low basis weight regions has a portion extending diagonally from the lateral center portion of the absorbent core to both laterally outward and longitudinally forward in a plan view, and the lateral center of the absorbent core. The portion has no longitudinally extending portion, and the lateral ends of the low basis weight region are located laterally inwardly with respect to the longitudinally lateral edges of the absorbent core, respectively.
An absorbent article in which at least a part of the plurality of low basis weight regions is present in the rear first region. The absorbent article according to claim 1, wherein the low basis weight region exists in the rear second region. At least one of the plurality of low basis weight regions is a claim in which the non- or low-sedimentation portion extends laterally across the lateral center line extending laterally by dividing the absorbent core laterally. Item 2. The absorbent article according to Item 1 or 2. One of claims 1 to 3, wherein at least one of the plurality of low basis weight regions has one non- or low basis weight portion continuous from one end to the other end in the lateral direction of the low basis weight region. Absorbent article described in. The absorbent article according to any one of claims 1 to 4, wherein the non-or low-deposited portion is a through hole penetrating the absorbent core in the thickness direction. The absorbent article according to any one of claims 1 to 5, wherein both ends of the low basis weight region in the lateral direction each have a tapered shape in a plan view. One of claims 1 to 6, wherein the lateral ends of the low basis weight region are located laterally outward from the lateral ends of the narrowest portion having the shortest lateral length in the absorbent core. The absorbent article described in the section. In a plan view, the absorbent core is connected to the narrowest portion having the shortest lateral length and the front end in the vertical direction of the narrowest width, and the front of the core having a longer lateral length than the narrowest portion. The first to sixth aspects of claim 1 to 6, which have a portion and are arranged in the vertical direction in the order of the front portion of the core, the narrowest portion, the first rear region, and the second rear region from the front side in the vertical direction. The absorbent article according to any one item. The narrowest portion is a region located in the center of the absorbent article in the vertical direction and having a predetermined length in the vertical direction, and both side edges of the narrowest portion along the vertical direction are in the vertical direction. The absorbent article according to claim 8, which is parallel. The absorbent article according to claim 9, wherein both ends of the low basis weight region in the horizontal direction are located laterally outward from the side edges along the vertical direction of the narrowest portion.

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