JP6824031B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

As an absorber used in disposable diapers and sanitary napkins, one in which the skin-facing surface of the absorber is embossed or one having a groove is known.
For example, in Patent Document 1, a central curved portion is formed in the center of the inseam region in the width direction of the absorber so that the absorber can be bent inwardly, and the width of the inseam region with respect to the central curved portion. A first curved portion is formed on the outer side in the direction so that the absorber can bend convexly in the outward direction, and the absorber is formed on the outer side in the width direction with respect to the first curved portion in the inseam region. The second curved portion is formed so as to be able to bend convexly inward, and the absorber on the outer side in the longitudinal direction with respect to the first curved portion has the width from the outer end portion in the width direction of the absorber. A disposable portion is formed which is recessed inward in the direction, and the second curved portion is arranged outside the inner end portion in the width direction of the recess portion in the width direction. Items to be worn are listed.

Further, in Patent Document 2, an absorber is interposed between the liquid-permeable front surface sheet and the back surface sheet, and vertical embossed grooves are formed in pairs on the left and right sides along the substantially longitudinal direction. In the absorbent article, the vertical embossed groove is described as having a shape in which the separation width is narrowed from the rear side to the front side of the absorbent article.

Further, the applicant has previously provided an absorber composed of multiple layers, and the absorber is formed by laminating one or more upper layer absorbers on the lower layer absorber, and one or more of the upper layers. The absorber is joined and integrated with the lower layer absorber by a large number of deep recesses, and a large number of shallow recesses are formed in the lower layer absorber, and the shallow recesses are formed in the upper layer absorber in a plan view. We have proposed an absorbent article that is also formed in the inner region of the peripheral edge of the body (Patent Document 3).

Japanese Unexamined Patent Publication No. 2013-13524 Japanese Unexamined Patent Publication No. 2007-1436999 Japanese Unexamined Patent Publication No. 2008-79746

However, in the absorbent articles described in Patent Documents 1 and 2, the strain of the absorber (absorbent core) becomes large in the portion corresponding to the crack in the buttocks and the periphery thereof, and the absorber is wrinkled. , May cause fluid flow of body fluids. On the other hand, if the portion of the absorber corresponding to the raised portion of the buttocks is significantly deformed, distortion may occur and the fit to the buttocks may be lowered.

Further, also in the absorbent article described in Patent Document 3, there is room for improvement in the occurrence of distortion and wrinkles due to bending of the absorbent body (absorbent core) when worn.

An object of the present invention relates to providing an absorbent article capable of solving the above-mentioned problems of the prior art.

The present invention is an absorbent article having a front surface sheet, a back surface sheet, and an absorbent core arranged between them, and having a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction. In the absorbent core, a plurality of recesses are formed in the rear portion of the core located behind the central position of the absorbent article in the vertical direction in a state of being dispersed in the vertical direction and the horizontal direction. A central recess region having a plurality of the recesses is formed in the lateral central portion of the rear portion of the core, and lateral recess regions having a plurality of the recesses are formed on both sides of the central recess region. The aspect ratio, which is the value obtained by dividing the vertical length of the concave portion by the horizontal length, is closer to 1.0 in the central concave portion region than in the lateral concave region, and the area of the concave portion is The central recessed region is larger than the lateral recessed region to provide an absorbent article.

According to the present invention, it is possible to improve the occurrence of distortion and wrinkles in the absorbent core when worn, improve the fit, and suppress the occurrence of liquid flow.

FIG. 1 is a perspective view showing a basic configuration 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 pants-type disposable diaper shown in FIG. 1 in the unfolded and extended state. FIG. 3 is a cross-sectional view schematically showing the cross section taken along line II of FIG. FIG. 4 is an exploded perspective view schematically showing the pants-type disposable diaper shown in FIG. FIG. 5 is a schematic plan view showing an example of a preferable absorbent core included in the pants-type disposable diaper shown in FIG. 6 (a) and 6 (b) are schematic plan views showing patterns of recesses in the central recess region, the lateral recess region, and the rear recess region. FIG. 7A is a diagram showing the positions and dimensions of the central concave region, the lateral concave region, and the rear concave region in the rear portion of the core. 7 (b) is Hisashi Naka recess area is a diagram illustrating the dimensions of each recess located laterally recessed area and the rear recessed region. 8 (a) to 8 (c) are vertical cross-sectional views of the recess in the present invention. FIG. 9 is a perspective view schematically showing a deformed state of the absorbent core while wearing the pants-type disposable diaper shown in FIG.

Hereinafter, the present invention will be described based on the preferred embodiment 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 horizontal direction Y orthogonal to the vertical direction X. Further, the inseam B and the absorber 23 (absorbent core 24) having a ventral side A and a dorsal side C extending in the longitudinal direction X from the front and back of the crotch B and having liquid retention are provided in the inseam. Provided in B. 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 B when the diaper 1 is worn. The dorsal side portion C is a portion arranged on the front side of the diaper 1 and is arranged on the back side of the wearer, that is, the rear 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 including 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 A and a dorsal side 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. The side seal portions S and S, the waist opening WH through which the wearer's body 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 divides the diaper 1 into two equal parts in the vertical direction X and extends the front side (ventral side) of the wearer's body in the wearing state with reference to the vertical center line CLx extending in the horizontal direction Y. It is divided into a front body F that covers 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 side C is a part of the back body R, and the inseam B extends over the front body F and the back body R. The ventral side portion A and the dorsal side portion C are both portions at the same positions 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 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 stretched state" of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the deployed state, and the diaper 1 in the deployed state is stretched with the elastic members of each part to design dimensions (the influence of the elastic members is completely affected). It refers to the state in which it is expanded to the same size as when it is expanded in a flat shape in the excluded state).

The diaper 1 has a front surface sheet 21, a back surface sheet 22, and an absorber 23 arranged between them. More specifically, as shown in FIG. 3, the absorbent body 2 has a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-impermeable or liquid-impermeable surface that forms a non-skin-facing surface, or It is provided with a water-repellent back surface sheet 22 and a liquid-retaining absorber 23 interposed between both sheets 21 and 22, and these are integrated by a known joining means such as an adhesive. There is.
The absorber 23 is configured to include a liquid-retaining absorbent core 24 and a core wrap sheet 25 for coating the absorbent core 24, and the absorbent core 24 is coated on the core wrap sheet 25. In this state, it is arranged between the front surface sheet 21 and the back surface sheet 22. In the absorbent core 24, the entire surface of the skin-facing surface side and the surface of the non-skin facing surface are covered with the core wrap sheet 25, and more specifically, the absorbent core 24 includes both side surfaces along the vertical direction. The entire circumference of the cross section is covered with the core wrap sheet 25. 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 its constituent members (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 closer to the skin, the "non-skin facing surface" is the surface of the absorbent article or its constituents that faces the opposite side of the skin when the absorbent article is worn, that is, relatively from the wearer's skin. The distant side. 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 a flat single-layer structure, and is located in front of and behind the central narrow portion 240 and the central narrow portion 240, and the length in the lateral direction Y is longer than that of the central narrow portion 240. It has a portion 241 and a core rear portion 242. Specifically, the absorbent core 24 in the diaper 1 has an hourglass shape in a plan view as shown in FIG. 2, that is, the center width is narrow at the front end of the center width narrow portion 240 having a short length in the horizontal direction Y in the vertical direction X. The core front portion 241 having a length in the lateral direction Y longer than that of the portion 240 is connected, and the length in the lateral direction Y is longer than that of the central narrow portion 240 at the rear end of the vertical X of the central narrow portion 240. It has a shape in which the long core rear portion 242 is connected. As shown in FIG. 2, the central narrow 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.
The absorbent core 24 in the diaper 1 includes the side edge portion AS of the ventral side portion A and the side edge portion CS of the dorsal side portion C 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 in the inseam B, which is an area sandwiched between the two.

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 end 24a and the rear of the absorbent core 24 in the vertical direction X. It extends outward from each of the ends 24b 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.

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. it can. For example, as the front surface sheet 21, various non-woven fabrics, perforated films, and the like can be used, and as the back surface sheet 22, a resin film, a laminate of the resin film and the non-woven fabric, and the like can be used. 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 fibers treated with a hydrophilizing agent and water absorption can be used. 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 formed on the left and right sides of the absorbent main body 2 on the skin-facing surface along the vertical direction X. Leakage cuffs 26, 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 at 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 part A, the inseam B, and the crotch part B. The contour lines of each of the dorsal side 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 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 FIG. 3, the exterior body 3 is formed by laminating 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 32 that is arranged to face the skin facing surface of the outer layer sheet 31 in a worn state. It is composed including the body. 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 longitudinal direction X on the ventral side A and the back side 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 side and covers the end portion of the absorbent body 2 in the vertical direction X.

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 a plurality of waist elastic members 33 for forming waist gathers (plural in the present embodiment) 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 in the waist opening WH over the entire circumference thereof.
Further, the exterior body 3 is one or a plurality of leg elastic members arranged on the back body R in an extended state as leg elastic members forming leg gathers at the opening edges of each of the pair of leg openings LH and LH (in this 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.

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. The ventral outer layer sheet 31A constituting the side portion A, the dorsal outer layer sheet 31C forming the dorsal side C, and the inseam outer layer sheet 31B located between the two sheets 31A and 31C and forming the inseam B are included. It is composed of. 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 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 fibers include a method of laminating and entangled with water flow, a method of entwining fibers by air through, and a method of joining by heat embossing, an adhesive, ultrasonic waves, and the like. Further, 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 absorbent core 24 has a core rear portion 24B located rearward from the central position of the absorbent article (diaper 1) in the vertical direction X. More specifically, the absorbent article has a core front portion 24A located in front of the vertical center line CLx, which is bisected in the vertical direction X and extends in the horizontal direction Y, and a core rear portion 24B located behind. ing. As described above, the absorbent core 24 has the core front portion 241, the central narrow portion 240, and the core rear portion 242 in this order from the front side in the vertical direction X, whereas the core front portion 24A has the core front portion 241 and the center. The core rear portion 24B includes a portion of the narrow portion 240 from the front end to the vertical center line CLx in the vertical direction X, and the core rear portion 24B is a portion of the central narrow portion 240 from the vertical center line CLx to the rear end in the vertical direction X and the core rear portion 242. (See FIG. 5). In the absorbent core 24, the outer shape (contour line) of the absorbent core 24 is bisected in the horizontal direction Y and extends in the vertical direction X with reference to one side and the other. It is formed symmetrically with the side.

The core rear portion 24B in the diaper 1 of the present embodiment is configured to include a rear first region 243 and a rear second region 244 in order from the front side. More specifically, the rear core portion 242 includes a rear first region 243 and a rear second region 244. Further, the rear second region 244 is connected to the rear end of the rear first region 243 in the vertical direction X. In the rear first region 243, the length in the lateral direction Y increases sharply from the front side to the rear side in the vertical direction X, whereas in the rear second region 244, the length in the lateral direction Y increases. However, it is substantially constant from the front side to the rear side of the vertical direction X, or the amount of increase in the length of the horizontal direction Y per unit length of the vertical direction X is remarkable as compared with the rear first region 243. small.

The core rear portion 24B and the core rear portion 242 are formed so that the central portion in the lateral direction Y is located at the crevice (intergluteal cleft) of the wearer's buttocks. More specifically, the rear first region 243 of the core rear portion 242, particularly the portion on the rear end side of the rear first region 243, is located near the front end of the crevice of the wearer's buttocks, and the rear second region 244. Is located at a rear position separated from the front end of the buttock crevice by a predetermined distance. Both side edges of the rear first region 243 along the vertical direction X are laterally Y from the boundary between the central narrow portion 240 and the rear first region 243 (core rear portion 242) in a plan view as shown in FIG. It extends diagonally outward of and toward the rear of the vertical direction X. On the other hand, as shown in FIG. 5, the rear second region 244 has both side edges along the vertical direction X parallel to the vertical direction X.

The core rear portion 24B has a central portion 50 located at the center in the lateral direction Y, and side portions 51 and 51 located on both sides of the central portion 50. More specifically, the absorbent core 24 has two straight lines parallel to each other extending the core rear portion 24B in the longitudinal direction X of the absorbent article, and the maximum length (maximum width) of the core rear portion 24B in the lateral direction Y. When it is divided into two straight lines that divide it into three equal parts, it has a central portion 50 located at the center thereof and side portions 51 and 51 on both sides thereof.

As shown in FIG. 5, a plurality of recesses 4 are formed in the core rear portion 24B of the absorbent core 24, more specifically, in the core rear portion 242 in a state of being dispersed in the vertical direction X and the horizontal direction Y.
Further, a central recess region 55 having a plurality of recesses 4 is formed in the central portion 50 in the lateral direction Y of the core rear portion 24B, and lateral recess regions 56 having a plurality of recesses 4 are formed on both sides of the central portion 50. Has been done.
Here, a plurality of recesses 4A are formed in the central portion 50, and as shown in FIGS. 6A and 6B, among these recesses 4A, the recess 4A located at the outermost side in the central portion 50 The region surrounded by the line connecting the outer edges of the center is defined as the central concave region 55. Further, recesses 4B are formed on both sides of the central recess region 55, and specifically, a plurality of recesses 4B are formed on the side portions 51 and 51, as shown in FIGS. 6A and 6B. In addition, among these recesses 4B, a region surrounded by a line connecting the outer edges of the recesses 4B located on the outermost side around the side portions 51 and 51 is referred to as a lateral recess region 56. The recess located in the central recess region 55 is also referred to as the recess 4A, and the recess located in the side recess region 56 is also referred to as the recess 4B. The recess in the rear recess region 57, which will be described later, is also referred to as a recess 4C, and the recess in the corner portion 58 is also referred to as a recess 4D. These recesses 4A, 4B4C and 4D are collectively referred to as recess 4.

Further, the aspect ratio (vertical width / horizontal width), which is the value obtained by dividing the length of the concave portion 4 in the vertical direction X by the length of the horizontal direction Y, is 1. In the central concave portion region 55 than in the lateral concave region 56. Close to 0. The absorbent core is generally provided with a recess so as to facilitate the deformation of the absorber 23. However, even if a recess is provided in the portion of the absorbent core 24 that abuts in the buttock crack, if the absorbent core is greatly bent with the recess as a bent portion, a large strain may occur around the recess. In particular, if the width of the recess in the bending direction is long in the bending direction in which the absorbent core is bent and in the orthogonal direction orthogonal to the bending direction, distortion is likely to occur on both sides in the orthogonal direction. Further, when there are a plurality of bending directions such as a portion in contact with a crack in the buttocks and a plurality of bending points are generated in the recess, the strain generated on both sides in the orthogonal direction of the recess tends to increase as the bending direction increases. It is in. Further, the side portions 51 and 51 in the core rear portion 24B are portions where the raised portion of the buttocks abuts, and this portion does not require as much bending as the central portion 50, but follows the bending of the central portion 50. Distortion may occur when the side portion 51 is also bent too much.

On the other hand, in the absorbent article of the present invention, the aspect ratio (length / width) of the recess 4 is made closer to 1.0 in the central recess region 55 than in the side recess region 56, so that the recess 4 is orthogonal to the recess 4. It is possible to suppress the occurrence of distortion on both sides of the direction. That is, by reducing the difference between the width in the bending direction and the width in the orthogonal direction in the recess 4, the bending points generated on both sides in the vertical direction and both sides in the horizontal direction can be concentrated in one place, and distortion can be generated. It can be suppressed. Further, in the absorbent article of the present invention, the aspect ratio of the recess 4 is made larger than 1.0 in the lateral recess region 56 than in the central recess region 55, that is, the width of the recess 4 in the bending direction is shortened. Moreover, by increasing the width in the orthogonal direction, it is possible to suppress the occurrence of distortion in the side portion 51 of the core rear portion 24B and to realize a small bending according to the raised portion of the buttocks. Here, the bending direction according to the raised portion of the buttocks in the lateral concave region 56 is the lateral direction Y of the core rear portion 24B, and the orthogonal direction is the vertical direction X.

In order to more reliably achieve the above effect, the aspect ratio (length L4A / width W4A) of the recess 4A of the central recess region 55 is preferably 0.5 or more, more preferably 0.7 or more, and more preferably. Is 2.0 or less, more preferably 1.3 or less, and preferably 0.5 or more and 2.0 or less, more preferably 0.7 or more and 1.3 or less.
The aspect ratio (length L4B / width W4B) of the recess 4B of the side recess region 56 is preferably 1.3 or more, more preferably 2.0 or more, and preferably 20 or less, more preferably 10. It is less than or equal to, preferably 1.3 or more and 20 or less, and more preferably 2.0 or more and 10 or less.

Further, the area of the recess 4 is larger in the central recess region 55 than in the side recess region 56. Distortion that occurs on both sides of the recess in the orthogonal direction tends to occur not in the recess 4 itself but in the peripheral portion of the recess 4. Further, as described above, the central portion 50 of the core rear portion 24B tends to undergo a large bending. Therefore, in the absorbent article of the present invention, the area of the recess 4 is made larger in the central recess region 55 than in the side recess region 56, thereby reducing the portion (area) where distortion occurs in the central recess region 55. , The occurrence of distortion can be suppressed. Further, since the side portions 51 and 51 do not tend to bend as much as the central portion 50, the area of the recess 4B of the side recess region 56 is made smaller than that of the central recess region 55, so that the area of the recess 4B can be made smaller than that of the central recess region 55. Can be bent.
The absorbent article of the present invention fits by improving the occurrence of distortion and wrinkles in the absorbent core 24 when worn by deforming the core rear portion 24B according to the shape of the crack and the raised portion of the buttocks as described above. It is possible to improve the properties and suppress the generation of liquid flow due to strain and wrinkles.

Order to more reliably exhibited the effect of the above, the total area S4A of each recess 4A located in the central recess region 55 is preferably 500 mm ² or more, more preferably 1000 mm ² or more, and preferably 8000mm ² or less, more preferably at 5000 mm ² or less, and preferably 500 mm ² or more 8000mm ² or less, more preferably 1000 mm ² or more 5000 mm ² or less.
The total area S4B of each recess 4B located in the lateral recess region 56 is preferably 100 mm ² or more, more preferably 200 mm ² or more, and preferably 1000 mm ² or less, more preferably 600 mm ² or less. Further, it is preferably 100 mm ² or more and 1000 mm ² or less, and more preferably 200 mm ² or more and 600 mm ² or less.

From the viewpoint of further suppressing the occurrence of strain in the central portion 50 of the core rear portion 24B, the concave portion 4A of the central concave portion region 55 shown in FIG. 7A is preferably in the following range.
The width W4A (hereinafter, also referred to as the width W4A) of the recess 4A in the lateral direction Y is preferably 2 mm or more, more preferably 4 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 2 mm. It is 20 mm or more, more preferably 4 mm or more and 15 mm or less.
The width L4A (hereinafter, also referred to as vertical width L4A) of the recess 4A located in the central recess region 55 in the vertical direction X is preferably 2 mm or more, more preferably 4 mm or more, and preferably 20 mm or less, more preferably 15 mm. It is less than or equal to, preferably 2 mm or more and 20 mm or less, and more preferably 4 mm or more and 15 mm or less.

The area Sa of each recess 4A located in the central recess region 55 is preferably 4 mm ² or more, more preferably 10 mm ² or more, preferably 400 mm ² or less, more preferably 250 mm ² or less, and preferably 4 mm. ² or more and 400 mm ² or less, more preferably 10 mm ² or more and 250 mm ² or less.

The width W4A of the recess 4A located in the central recess region 55 in the lateral direction Y is preferably 5% or more, more preferably 10% or more, and preferably 10% or more of the width W1 of the central recess region 55 in the lateral direction Y. It is 35% or less, more preferably 25% or less, and preferably 5% or more and 35% or less, more preferably 10% or more and 25% or less. The width W1 of the central concave portion region 55 in the lateral direction Y is the width at the position where the concave portion 4A of the central concave portion region 55 is provided in the vertical direction X of the absorbent core 24.

The width L4A of the recess 4A located in the central recess region 55 in the vertical direction X is preferably 2% or more, more preferably 5% or more, and preferably 5% or more, with respect to the width L1 of the central recess region 55 in the vertical direction X. It is 15% or less, more preferably 10% or less, preferably 2% or more and 15% or less, and more preferably 5% or more and 10% or less.
The area Sa of the recess 4A is preferably 0.1% or more, more preferably 0.5% or more, and preferably 5% or less, more preferably 3% or less, based on the area S1 of the central recess region 55. Yes, and more preferably 0.1% or more and 5% or less, and more preferably 0.5% or more and 3% or less. The dimensions and area of the central concave region 55 will be described later.

From the viewpoint of more easily deforming the central portion 50 in the core rear portion 24B along the shape of the buttocks, the number of recesses 4A located in the central recess region 55 is preferably 6 or more, more preferably 8 or more. Further, the number is preferably 100 or less, more preferably 80 or less, preferably 6 or more and 100 or less, and more preferably 8 or more and 80 or less.

From the viewpoint of facilitating the deformation of the central portion 50 when worn, the area ratio of the concave portion 4A of the central concave portion region 55, that is, the ratio of the total area S4A of each concave portion 4A to the area S1 of the central concave portion region 55 is preferably 15%. As described above, it is more preferably 25% or more, preferably 50% or less, more preferably 35% or less, and preferably 15% or more and 50% or less, more preferably 25% or more and 35% or less.

The recesses 4A located in the central recess region 55 are dispersed in the vertical direction X and the horizontal direction Y, that is, the recesses 4A are arranged at intervals L10 in the vertical direction X and the horizontal direction Y. From the viewpoint of facilitating the deformation in the central portion 50, the distance L10 between the adjacent recesses 4A is preferably 1 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 7 mm or less. Further, it is preferably 1 mm or more and 10 mm or less, and more preferably 2 mm or more and 7 mm or less. The distance L10 between the recesses 4A is the shortest distance between the adjacent recesses 4A. Each interval L10 may be the same or different.

From the viewpoint of facilitating bending of the side portions 51 and 51 according to the raised portion of the buttocks, the dimensions and area of the recess 4B of the lateral recess region 56 are preferably in the following range.
The width W4B (hereinafter, also referred to as the width W4B) of the recess 4B located in the lateral recess region in the lateral direction is preferably 1 mm or more, more preferably 2 mm or more, and preferably 15 mm or less, more preferably 10 mm or less. It is preferably 1 mm or more and 15 mm or less, and more preferably 2 mm or more and 10 mm or less.

The width L4B (hereinafter, also referred to as the vertical width L4B) of the recess 4B located in the lateral recess region 56 in the vertical direction X is preferably 2 mm or more, more preferably 5 mm or more, and preferably 20 mm or less, more preferably. It is 15 mm or less, preferably 2 mm or more and 20 mm or less, and more preferably 5 mm or more and 15 mm or less.

The area Sb of the recess 4B located in the lateral recess region 56 is preferably 2 mm ² or more, more preferably 5 mm ² or more, preferably 200 mm ² or less, more preferably 100 mm ² or less, and preferably 2 mm. ² or more and 200 mm ² or less, more preferably 5 mm ² or more and 100 mm ² or less.

The width W4B of the recess 4B located in the lateral recess region 56 in the lateral direction Y is preferably 1% or more, more preferably 3% or more, and more preferably 3% or more with respect to the width W2 of the lateral recess region 56 in the lateral direction Y. It is preferably 20% or less, more preferably 15% or less, and preferably 1% or more and 20% or less, more preferably 3% or more and 15% or less. The width W2 of the lateral recess region 56 in the lateral direction Y is the width of the absorbent core 24 at the position where the recess 4B of the lateral recess region 56 is provided in the vertical direction X.

The width L4B of the recess 4B located in the lateral recess region 56 in the vertical direction X is preferably 3% or more, more preferably 5% or more, with respect to the width L1 of the lateral recess region 56 in the vertical direction X. It is preferably 20% or less, more preferably 15% or less, and preferably 3% or more and 20% or less, more preferably 5% or more and 15% or less.

The area Sb of the recess 4B is preferably 0.05% or more, more preferably 0.1% or more, and preferably 3% or less, more preferably 2% or less, based on the area S2 of the side recess region 56. It is preferably 0.05% or more and 3% or less, and more preferably 0.1% or more and 2% or less. The dimensions and area of the lateral recess region 56 will be described later.

From the viewpoint of further suppressing the occurrence of twisting in the side portion 51 of the core rear portion 24B, the number of recesses 4B located in the lateral recess region 56 is preferably 6 or more, more preferably 8 or more, and preferably 8 or more. It is 100 or less, more preferably 60 or less, preferably 6 or more and 100 or less, and more preferably 8 or more and 60 or less.

The area ratio of the recess 4B of the side recess region 56, that is, the ratio of the total area S4B of each recess 4B to the area S2 of the side recess region 56 is preferably 4% or more, more preferably 7% or more, and more preferably. Is 20% or less, more preferably 16% or less, and preferably 4% or more and 20% or less, more preferably 7% or more and 16% or less.

From the viewpoint of further suppressing the occurrence of twisting in the side portion 51 of the core rear portion 24B when worn, the recesses 4B located in the lateral recessed regions 56 are adjacent recesses in the same manner as the recesses 4A located in the central recessed region 55. The 4Bs are arranged at intervals L11 in the vertical direction X and the horizontal direction Y. The distance L11 between the adjacent recesses 4B is preferably 1 mm or more, more preferably 2 mm or more, preferably 10 mm or less, more preferably 7 mm or less, and preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more. It is 7 mm or less. The distance L11 between the recesses 4B is the shortest distance between the adjacent recesses 4B. Each interval L11 may be the same or different.

From the viewpoint of further suppressing the occurrence of strain in the core rear portion 24B, the aspect ratio of the recess 4 is preferably larger in the lateral recess region 56 than in the central recess region 55. The aspect ratio of the recess 4B of the side recess region 56 to the aspect ratio of the recess 4A of the central recess region 55 is preferably 1.5 times or more, more preferably 2 times or more, and preferably 20 times or less. It is preferably 10 times or less, preferably 1.5 times or more and 20 times or less, and more preferably 2 times or more and 10 times or less.

From the same viewpoint, the area Sb of the recess 4B of the side recess region 56 is preferably 2 times or more, more preferably 3 times or more, and preferably 40 times the area Sa of the recess 4A of the central recess region 55. Hereinafter, it is more preferably 25 times or less, preferably 2 times or more and 40 times or less, and more preferably 3 times or more and 25 times or less.

The central recessed region 55 is preferably located at a position where it abuts in the buttock crevice. More specifically, it is preferable that the position of the central concave region 55 shown in FIG. 7A in the core rear portion 24B is in the following range.
The distance P1 between the front end F1 of the central concave region 55 and the vertical center line CLx in the vertical direction X is preferably 20 mm or more, more preferably 30 mm or more, and preferably 100 mm or less, more preferably 80 mm or less. Further, it is preferably 20 mm or more and 100 mm or less, and more preferably 30 mm or more and 80 mm or less.

The distance P2 between the rear end B1 of the central concave region 55 and the rear end 24b of the core rear portion 24B in the vertical direction X is preferably 20 mm or more, more preferably 30 mm or more, and preferably 80 mm or less, more preferably 60 mm. It is less than or equal to, preferably 20 mm or more and 80 mm or less, and more preferably 30 mm or more and 60 mm or less.

As shown in FIG. 7A, the central concave region 55 is the shortest in the lateral direction Y between one side end T of the core rear portion 24B and the side end T1 of the central concave region 55 located on the side end T side. The distance P3 is preferably 20 mm or more, more preferably 30 mm or more, preferably 100 mm or less, more preferably 80 mm or less, and preferably 20 mm or more and 100 mm or less, more preferably 30 mm or more and 80 mm or less. The central recessed region 55 is preferably located at the rear portion 24B of the core so that the respective distances P3 on both sides in the lateral direction Y are within the above range.

At least a part of the central recessed region 55 is located at the central portion 50 of the core rear portion 24B, and preferably the central portion when the maximum width of the core rear portion 24B in the lateral direction Y is divided into three equal parts by two parallel straight lines. It is located in the division of. Further, a part of the central recessed region 55 may protrude from the central portion 50 of the core rear portion 24B and exist in the side portions 51 and 51.

Further, in order to ensure that the central concave region 55 is brought into contact with the cracked portion of the buttocks, the size of the central concave region 55 shown in FIG. 7A is preferably in the following range.
The width W1 of the central concave region 55 in the lateral direction Y is preferably 20 mm or more, more preferably 30 mm or more, preferably 80 mm or less, more preferably 60 mm or less, and preferably 20 mm or more and 80 mm or less, more preferably. It is 30 mm or more and 60 mm or less.

The width W1 of the central concave region 55 in the lateral direction Y is preferably 20% or more, more preferably 30% or more, and preferably 70% or less, more preferably, with respect to the width W of the core rear portion 24B in the lateral direction Y. Is 50% or less, preferably 20% or more and 70% or less, and more preferably 30% or more and 50% or less. The width W of the core rear portion 24B in the lateral direction Y is the width of the core rear portion 24B at the position having the central concave region 55 in the vertical direction X.

The width L1 of the central concave region 55 in the vertical direction X is preferably 70 mm or more, more preferably 80 mm or more, preferably 180 mm or less, more preferably 150 mm or less, and preferably 70 mm or more and 180 mm or less, more preferably. Is 80 mm or more and 150 mm or less.

The width L1 of the central concave region 55 in the vertical direction X is preferably 40% or more, more preferably 50% or more, with respect to the width L in the vertical direction X from the vertical center line CLx to the rear end 24b of the core rear portion 24B. It is preferably 98% or less, more preferably 90% or less, and preferably 40% or more and 98% or less, more preferably 50% or more and 90% or less.

From the viewpoint of further suppressing the occurrence of distortion in the central portion 50 of the core rear portion 24B during wearing, the area S1 of the central concave region region 55 is preferably 1400 mm ² or more, more preferably 2400 mm ² or more, and preferably 15000 mm ^2. or less, more preferably 9000 mm ² or less, and preferably 1400 mm ² or more 15000 ² or less, and more preferably 2400 mm ² or more 9000 mm ² or less.
From the same viewpoint, the area S1 of the central concave region 55 is preferably 10% or more, more preferably 20% or more, and preferably 50% or less, more preferably 40% with respect to the area SA of the core rear portion 24B. It is less than or equal to, preferably 10% or more and 50% or less, and more preferably 20% or more and 40% or less.

From the viewpoint of more easily deforming the core rear portion 24B in accordance with the buttock crevice, the central concave region 55 preferably extends in the vertical direction X. In order to more reliably achieve this effect, the width L1 of the central concave region 55 in the vertical direction X is preferably 200% or more, more preferably 250% or more, with respect to the width W1 of the central concave region 55 in the horizontal direction Y. Yes, more preferably 400% or less, more preferably 300% or less, and preferably 200% or more and 400% or less, more preferably 250% or more and 300% or less.

The lateral concave region 56 is formed so as to sandwich the central concave region 55 on both sides of the central portion 50, that is, the central concave region 55 in the lateral direction Y. The lateral recessed region 56 is preferably located at a position where it abuts on the raised portion of the buttocks. Specifically, the position of the lateral recess region 56 in the core rear portion 24B is preferably in the following range.
The distance P4 between the front end F2 of the lateral concave region 56 and the vertical center line CLx in the vertical direction X is preferably 25 mm or more, more preferably 35 mm or more, and preferably 110 mm or less, more preferably 90 mm or less. Further, it is preferably 25 mm or more and 110 mm or less, and more preferably 35 mm or more and 90 mm or less.

The distance P5 between the rear end B2 of the lateral recess region 56 and the rear end 24b of the core rear portion 24B in the longitudinal direction X is preferably 20 mm or more, more preferably 30 mm or more, and preferably 80 mm or less, more preferably. It is 60 mm or less, preferably 20 mm or more and 80 mm or less, and more preferably 30 mm or more and 60 mm or less. When the core rear portion 24B has a rear recessed region 57, which will be described later, the side recessed region 56 and the rear recessed region 57 may be arranged so as to overlap each other in the vertical direction X as shown in FIG. 6A. Good.

As shown in FIG. 7A, the side recess region 56 is a lateral Y of one side end T of the core rear portion 24B and the side end T2 of the side recess region 56 located on the side end T side. The shortest distance P6 in the above is preferably 3 mm or more, more preferably 5 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 3 mm or more and 20 mm or less, more preferably 5 mm or more and 15 mm or less. .. The lateral recessed region 56 is preferably located at the rear portion 24B of the core so that the distances P6 on both sides in the lateral direction Y are within the above ranges.

The lateral recessed region 56 may be located on both sides, that is, on the side portions 51 and 51, respectively, sandwiching the central portion 50 in the lateral direction Y of the core rear portion 24, and preferably the area of the lateral recessed region 56. More than half, more preferably 80% or more of them are located on the sides 51, 51. Further, the lateral concave region 56 is preferably a part of the lateral concave region 56, more preferably half or more of the area S2 of the lateral concave region 56, and further preferably 80% or more of the area S2 is the core rear portion 24B. It is located in each of the divisions on both sides of the central division when the maximum width in the lateral direction Y is divided into three equal parts.

The dimensions of the lateral recess region 56 are preferably in the following range so that the raised portion of the buttocks in the lateral recess region 56 can be easily brought into contact with the buttock.
The width W2 of the lateral recess region 56 in the lateral direction Y is preferably 15 mm or more, more preferably 25 mm or more, preferably 75 mm or less, more preferably 65 mm or less, and preferably 15 mm or more and 75 mm or less, more preferably. Is 25 mm or more and 65 mm or less.

The width W2 of the lateral recess region 56 in the lateral direction Y is preferably 15% or more, more preferably 20% or more, and preferably 50% or less, more than the width W of the core rear portion 24B in the lateral direction Y. It is preferably 30% or less, preferably 15% or more and 50% or less, and more preferably 20% or more and 30% or less. The width W of the core rear portion 24B in the lateral direction Y is the width of the absorbent core 24 at the position having the lateral concave region 56 in the vertical direction X.

The width L2 of the lateral recess region 56 in the longitudinal direction X is preferably 65 mm or more, more preferably 75 mm or more, preferably 175 mm or less, more preferably 145 mm or less, and preferably 65 mm or more and 175 mm or less. It is preferably 75 mm or more and 145 mm or less.

The width L2 of the lateral recess region 56 in the vertical direction X is preferably 35% or more, more preferably 45% or more, and preferably 95% or less, more than the length L of the core rear portion 24B in the vertical direction. It is preferably 85% or less, preferably 35% or more and 95% or less, and more preferably 45% or more and 85% or less.

When worn, the side portion 51 of the core rear portion 24B may be twisted, and from the viewpoint of further suppressing the occurrence of the twisting of the side portion 51, the area S2 of the side recessed region 56 is preferably 900 mm ² or more. preferably at 1900 mm ² or more, and preferably 13000Mm ² or less, more preferably 8000mm ² or less, and preferably 900 mm ² or more 13000Mm ² or less, more preferably 1900 mm ² or more 8000mm ² or less.
From the same viewpoint, the area S2 of the lateral recess region 56 is preferably 25% or more, more preferably 30% or more, and preferably 45% or less, more preferably 40, with respect to the area SA of the core rear portion 24B. % Or less, preferably 25% or more and 45% or less, and more preferably 30% or more and 40% or less.

From the viewpoint of further suppressing the occurrence of strain in the central portion 50 of the core rear portion 24B and further improving the fit at the side portions 51 and 51 of the core rear portion 24B, the area ratio of the recess 4 is more central than that of the lateral concave region 56. The recessed area 55 is preferably larger. In order to achieve this effect more reliably, the area ratio of the recesses in the central recess region 55 is preferably 200% or more, more preferably 400% or more, with respect to the area ratio of the recesses in the side recess region 56. Further, it is preferably 1000% or less, more preferably 800% or less, preferably 200% or more and 1000% or less, and more preferably 400% or more and 800% or less.

In the present embodiment, as shown in FIG. 5, in the central concave portion region 55 , two rows in which four concave portions 4A are arranged in the vertical direction X are arranged in two rows in the horizontal direction Y. As shown in FIG. 6A, three rows in which two recesses 4A are arranged in the vertical direction X are arranged in three rows in the horizontal direction Y. As described above, the central concave region 55 preferably has a plurality of rows of a plurality of recesses 4A arranged in the vertical direction X in the horizontal direction Y, and the number of recesses 4A in each row may be the same or different. Good.
The central recess region 55 may have a plurality of rows of a plurality of recesses 4A arranged in the horizontal direction Y in the vertical direction X, and the number of recesses 4A in each row may be the same or different.
Further, the central recess region 55 may have a plurality of rows of recesses 4A arranged in the horizontal direction Y in the vertical direction X, and each row may have a different number of recesses 4A. As shown in FIG. 6B, the central recessed region 55 may have different numbers of recesses 4A arranged in the lateral direction Y located from the front end side to the rear end side of the core rear portion 24B.
Further, as shown in FIGS. 5 and 6A, the positions of the individual recesses 4A in the central recessed region 55 coincide with each other in the vertical direction X. The positions of the individual recesses 4A in the central recessed region 55 may be the same in the vertical direction X, or may be different from each other.

In the present embodiment, as shown in FIGS. 5, 6 (a) and 6 (b), in the lateral recess region 56, a plurality of rows in which a plurality of recesses 4B are arranged in the vertical direction X are arranged in the horizontal direction Y. There is. As described above, the lateral recess region 56 preferably has a plurality of rows of a plurality of recesses 4B arranged in the vertical direction X in the horizontal direction Y, and the number of recesses 4B in each row may be the same or different. May be good.
Further, the lateral recess region 56 may have a plurality of rows of a plurality of recesses 4B arranged in the horizontal direction Y in the vertical direction X, and the number of recesses 4B in each row may be the same or different. May be good.
Further, as shown in FIGS. 5 and 6A, the positions of the individual recesses 4B in the lateral recess region 56 coincide with each other in the vertical direction X. On the other hand, as shown in FIG. 6B, the positions of the individual recesses 4B in the lateral recess region 56 are different in the vertical direction X. The positions of the individual recesses 4B in the lateral recess region 56 may be the same or different in the vertical direction X.

The core rear portion 24B preferably has a rear recessed region 57 having a plurality of recesses behind the central recessed region 55. More specifically, as shown in FIG. 6A, the rear recessed region 57 is located behind the central recessed region 55 in the vertical direction X, that is, on the rear end 24b side of the absorbent core 24, and in the lateral direction Y. It overlaps with the central recessed region 55. Similar to the central concave region 55 and the lateral concave region 56, the rear concave region 57 is the outermost recess 4 located most outward from the center of the region, that is, the outermost portion in the vertical direction X or the horizontal direction Y of each region. A part of the outer peripheral portion of each concave portion 4 located on the side and a region surrounded by a line connecting them, and in the outer peripheral portion of each concave portion 4 located on the outermost side, the vertical X or the outer peripheral portion of the outer peripheral portion It is a region surrounded by a line connecting a part of the outer peripheral portion located on the outermost side in the lateral direction Y. By arranging the rear concave region 57, the dorsal portion of the buttocks has a gentle curved surface, so that the fit to the portion can be further improved.

In order to more reliably achieve the above effect, it is preferable that the aspect ratio of the recess is larger in the central recess region 55 than in the rear recess region 57. The aspect ratio of the recess 4A of the central recess region 55 to the aspect ratio of the recess 4C of the rear recess region 57 is preferably 1.2 times or more, more preferably 1.7 times or more, and preferably 40 times or less. It is more preferably 20 times or less, preferably 1.2 times or more and 40 times or less, and more preferably 1.7 times or more and 20 times or less.
The aspect ratio (length L4C / width W4C) of the recess 4C of the rear recess region 57 is preferably 0.05 or more, more preferably 0.1 or more, and preferably 0.8 or less, more preferably 0. It is 6 or less, preferably 0.05 or more and 0.8 or less, and more preferably 0.1 or more and 0.6 or less.

Further, in order to more reliably achieve the above effect, as shown in FIG. 6A, the rear concave region 57 overlaps not only the central concave region 55 but also the lateral concave region 56 in the lateral direction Y. Is preferable.
From the same viewpoint, it is preferable that the position and dimensions of the rear recessed region 57 shown in FIG. 7 (a) and the dimensions and the like of the recess 4C located in the region shown in FIG. 7 (b) are in the following ranges. ..

The distance P7 between the front end F3 of the rear concave region 57 and the vertical center line CLx in the vertical direction X is preferably 80 mm or more, more preferably 90 mm or more, and preferably 170 mm or less, more preferably 150 mm or less. Further, it is preferably 80 mm or more and 170 mm or less, and more preferably 90 mm or more and 150 mm or less.
The distance P8 between the rear end B3 of the rear recessed region 57 and the rear end 24b of the core rear portion 24B in the longitudinal direction X is preferably 3 mm or more, more preferably 5 mm or more, and preferably 15 mm or less, more preferably 10 mm. It is less than or equal to, preferably 3 mm or more and 15 mm or less, and more preferably 5 mm or more and 10 mm or less.

As shown in FIG. 7A, the rear recessed region 57 is the shortest in the lateral direction Y between one side end T of the core rear portion 24B and the side end T3 of the rear recessed region 57 located on the side end T side. The distance P9 is preferably 3 mm or more, more preferably 5 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 3 mm or more and 20 mm or less, more preferably 5 mm or more and 15 mm or less. The rear recessed region 57 is preferably located at the rear portion 24B of the core so that the respective distances P9 on both sides in the lateral direction Y are within the above range.
The rear concave region 57 may be partially present at a position overlapping the central concave region 55 in the lateral direction Y, and as shown in FIGS. 6A and 7, preferably the central concave region Y in the lateral direction Y. It exists at a position overlapping the region 55 and the lateral recess region 56.

The width W3 of the rear concave region 57 in the lateral direction Y is preferably 30 mm or more, more preferably 50 mm or more, preferably 210 mm or less, more preferably 150 mm or less, and preferably 30 mm or more and 210 mm or less, more preferably. It is 50 mm or more and 150 mm or less.

The width W3 of the rear recessed region 57 in the lateral direction Y is preferably 30% or more, more preferably 50% or more, and preferably 90% or less, more preferably, with respect to the width W of the rear portion 24B in the lateral direction. Is 70% or less, preferably 30% or more and 90% or less, and more preferably 50% or more and 70% or less. The width W of the core rear portion 24B in the lateral direction Y is the width of the core rear portion 24B at the position having the central concave region 55 in the vertical direction X.

The width L3 of the rear concave region 57 in the longitudinal direction X is preferably 10 mm or more, more preferably 20 mm or more, preferably 50 mm or less, more preferably 30 mm or less, and preferably 10 mm or more and 50 mm or less, more preferably. Is 20 mm or more and 30 mm or less.
The width L3 of the rear recessed region 57 in the vertical direction X is preferably 5% or more, more than the length of the core rear portion 24B in the vertical direction, that is, the width L from the vertical center line CLx to the rear end of the absorbent core 24. It is preferably 10% or more, preferably 25% or less, more preferably 15% or less, and preferably 5% or more and 25% or less, more preferably 10% or more and 15% or less.

The area S3 of the rear recessed region 57 is preferably 300 mm ² or more, more preferably 1000 mm ² or more, preferably 10000 mm ² or less, more preferably 4500 mm ² or less, and preferably 300 mm ² or more and 10000 mm ² or less. More preferably, it is 1000 mm ² or more and 4500 mm ² or less.
The area S3 of the rear recessed region 57 is preferably 5% or more, more preferably 10% or more, preferably 45% or less, more preferably 30% or less, and more preferably 30% or less, based on the area SA of the core rear portion 24B. It is preferably 5% or more and 45% or less, and more preferably 10% or more and 30% or less.

A plurality of recesses 4C are formed in the rear recessed region 57 in a state of being dispersed in the vertical direction X and the horizontal direction Y. The width W4C of the recess 4C in the lateral direction Y is preferably 5 mm or more, more preferably 10 mm or more, preferably 20 mm or less, more preferably 15 mm or less, and preferably 5 mm or more and 20 mm or less, more preferably 10 mm. It is 15 mm or more and 15 mm or less.

The width W4C of the recess 4C located in the rear recessed region 57 in the lateral direction Y is preferably 2% or more, more preferably 5% or more, and preferably 5% or more with respect to the width W3 of the rear recessed region 57 in the lateral direction Y. It is 15% or less, more preferably 10% or less, preferably 2% or more and 15% or less, and more preferably 5% or more and 10% or less. The width W3 of the rear concave region 57 in the lateral direction Y is the width of the absorbent core 24 at the position where the concave portion 4C of the rear concave region 57 is provided in the vertical direction X.

The length L4C of the recess 4C located in the rear recess region 57 in the vertical direction X is preferably 1 mm or more, more preferably 2 mm or more, preferably 15 mm or less, more preferably 10 mm or less, and preferably 1 mm. It is 15 mm or more, more preferably 2 mm or more and 10 mm or less. The length L4C of the recess 4C in the vertical direction X may or may not be constant, as in the case of the recesses 4A and 4B described above.

The length L4C of the recess 4C located in the rear recessed region 57 in the vertical direction X is preferably 1% or more, more preferably 2% or more, and more preferably 2% or more, based on the width L3 of the rear recessed region 57 in the vertical direction X. Is 10% or less, more preferably 7% or less, and preferably 1% or more and 10% or less, more preferably 2% or more and 7% or less.

The area Sc of each recess 4C located in the rear recess region 57 is preferably 2 mm ² or more, more preferably 5 mm ² or more, preferably 200 mm ² or less, more preferably 100 mm ² or less, and preferably 2 mm. ² or more and 200 mm ² or less, more preferably 5 mm ² or more and 100 mm ² or less.
The area Sc of the recess 4C is preferably 0.05% or more, more preferably 0.1% or more, and preferably 3% or less, more preferably 2% or less, based on the area S3 of the rear recess region 57. Yes, and more preferably 0.05% or more and 3% or less, and more preferably 0.1% or more and 2% or less.

The number of recesses 4C located in the rear recessed region 57 is preferably 5 or more, more preferably 10 or more, preferably 50 or less, more preferably 30 or less, and preferably 5 or more. The number is 50 or less, more preferably 10 or more and 30 or less.

As shown in FIGS. 5 and 6A, the rear recessed region 57 preferably has a plurality of rows in which a plurality of recesses 4C are arranged in the vertical direction X in the horizontal direction Y. In the present embodiment, as shown in FIGS. 5 and 6A, in the rear recessed region 57, rows of three recesses 4C arranged in the vertical direction X are arranged in four or three rows in the horizontal direction Y. .. When a plurality of rows in which a plurality of recesses 4C are arranged in the vertical direction X are provided in the horizontal direction Y, the number of recesses 4C in each row may be the same or different.
The rear recessed region 57 preferably has a plurality of rows in which a plurality of recesses 4C are arranged in the horizontal direction Y in the vertical direction X, and the number of recesses 4C in each row may be the same or different. ..
As shown in FIG. 6B, the rear recessed region 57 preferably has at least one row in which a plurality of recesses 4C are arranged in the lateral direction Y.

The total area S4C of each recess 4C located in the rear recess region 57 is preferably 80 mm ² or more, more preferably 150 mm ² or more, preferably 800 mm ² or less, more preferably 500 mm ² or less, and preferably 500 mm ² or less. 80 mm ² or more 800 mm ² or less, more preferably 150 mm ² or more 500 mm ² or less.
The area ratio of the recess 4C in the rear recess region 57, that is, the ratio of the total area S4C of each recess 4C to the area S3 of the rear recess region 57 is preferably 30% or more, more preferably 50% or more, and preferably 90. % Or less, more preferably 80% or less, and preferably 30% or more and 90% or less, more preferably 50% or more and 80% or less.

In each recess 4C located in the rear recess region 57, adjacent recesses 4C are arranged at intervals L12 in the vertical direction X and the horizontal direction Y. The distance L12 between the adjacent recesses 4C is preferably 1 mm or more, more preferably 2 mm or more, preferably 10 mm or less, more preferably 7 mm or less, and preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more. It is 7 mm or less. The distance L12 between the recesses 4C is the shortest distance between the adjacent recesses 4C. Each interval L12 may be the same or different.

The area ratio of the concave portion of the rear concave region 57 is preferably 5% or more, more preferably 10% or more, and preferably 40% or less, more preferably 20 with respect to the area ratio of the concave portion of the central concave region 55. % Or less, preferably 5% or more and 40% or less, and more preferably 10% or more and 20% or less.

In the present embodiment, as shown in FIG. 6B, the recesses 4D are obliquely oriented at the corners 58 on the rear end 24b side of the core rear portion 24B and at both ends in the lateral direction Y so as to face the corners 58. Is preferably formed. With such a configuration, the corner portion 58 of the core rear portion 24B can be bent according to the shape of the buttocks.
The corner portion 58 may have one recess 4D or may have a plurality of recesses 4D.
As shown in FIG. 6B, it is preferable that a part of the corner portion 58 exists at a position where it overlaps with the central concave portion region 55 or the rear concave portion region 57 in the vertical direction X. Further, as shown in FIG. 6B, it is preferable that a part of the corner portion 58 exists at a position where it overlaps with the central concave portion region 55 or the lateral concave portion region 56 in the lateral direction Y.

The recesses 4A, 4B, 4C, and 4D in the central recessed region 55, the lateral recessed region 56, the rear recessed region 57, and the corners 58 penetrate through the absorbent core 24 as shown in FIG. 8C. It is preferably a part or a low basis weight as compared with other parts. With such a configuration, the deformation of the core rear portion 24B becomes easier, and the core rear portion 24B becomes softer.
When each recess 4A, 4B, 4C, 4D has a lower basis weight than the other portions, each recess 4A, 4B, 4C, 4D is absorbent as shown in FIGS. 8A or 8B. The core 24 has an open bottom on either the skin-facing surface side or the non-skin-facing surface side, and the open portion may be closed with a layer made of a material for forming the absorbent core 24.

When each recess 4A, 4B, 4C has a lower basis weight than the other portions, the depth of each recess 4A, 4B, 4C, 4D in the thickness direction is preferably relative to the thickness of the absorbent core 24. It is 50% or more, more preferably 70% or more, preferably 100% or less, more preferably 98% or less, and preferably 50% or more and 100% or less, more preferably 70% or more and 98% or less. .. The other portion is a portion other than the recesses 4A, 4B, 4C, and 4D in the central recessed region 55, the lateral recessed region 56, and the rear recessed region 57.

In order to more reliably achieve the above effect, each basis weight of the recesses 4A, 4B, 4C, and 4D is preferably 70% or less, more preferably 50% or less, based on the basis weight of the other portion.
The basis weight of the recesses 4A, 4B, 4C is preferably 0 g / m ² or more, more preferably 10 g / m ² or more, and preferably 420 g / m ² or less, more preferably 300 g / m ² or less. Further, it is preferably 0 g / m ² or more and 420 g / m ² or less, and more preferably 10 g / m ² or more and 300 g / m ² or less.
The basis weight of the other portion, that is, the non-recessed portion, is preferably 80 g / m ² or more, more preferably 90 g / m ² or more, and preferably 600 g / m ² or less, more preferably 500 g / m ² or less. Yes, and more preferably 80 g / m ² or more and 600 g / m ² or less, and more preferably 90 g / m ² or more and 500 g / m ² or less.

The shapes of the concave portions 4A, 4B, 4C, and 4D in the central concave portion region 55, the lateral concave portion region 56, the rear concave portion region 57, and the corner portion 58 are not particularly limited, and are directional in a plan view such as a circular shape. It may have no shape, or it may have a directional shape in a plan view, such as a rectangular shape.

The absorbent core 24 preferably has a shape that is raised toward the skin-facing surface at the portion that contacts the buttocks. More specifically, as shown in FIG. 9, 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 central narrow portion 240 is lateral. The center line CLi is used as a fold curve, and the non-skin facing surface is turned inside to form a mountain fold. That is, the ridge 245 is formed by being deformed into an inverted V shape in a cross-sectional view along the lateral direction Y, and the ridge 245 is worn. While fitting to the intergluteal cleft of the person, the rear 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. By deforming the absorbent core 24 in this way, the absorbent article can be easily brought into close contact with the shape of the inseam of the wearer, and the fit can be further improved.
As the absorbent core 24 is deformed in this way, the central portion 50 of the core rear portion 24B is greatly bent, and distortion occurs. Further, the side portions 51 and 51 of the core rear portion 24B are also bent too much, and distortion occurs. This strain can prevent the absorbent core 24 from being deformed to match the shape of the buttocks. In addition, wrinkles generated by strain may cause liquid flow. However, as described above, the absorbent article of the present invention, that is, the diaper 1, has the absorbent core 24 (core rear portion 24B) formed into the shape of the crevice and the raised portion of the buttocks due to the presence of the central concave region 55 and the lateral concave region 56. It can be deformed together to prevent the occurrence of distortion and wrinkles in the absorbent core when worn, and can prevent the occurrence of liquid flow.

The absorbent article of the present invention is not limited to the pants-type disposable diaper (pants-type worn article) in the above embodiment, and may be a deployable disposable diaper or a urine absorbing pad. Further, it is not limited to adults, but may be for infants and the like.

1 Pants-type disposable diaper (absorbent article)
2 Absorbent body 21 Front sheet 22 Back sheet 23 Absorbent 24 Absorbent core 24A Core front 24B Core rear 240 Center narrow 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 Recess 4A Recess located in the central recess area 4B Recess located in the lateral recess area 4C Recess located in the rear recess area 50 Central 51 Side 55 Central recess area 56 Lateral recess area 57 Rear recess area 58 Corner A Ventral side B Inseam C Dorsal side CLx Vertical center line CLy Horizontal center line S Side seal part X Vertical direction Y Horizontal direction

Claims (7)

An absorbent article having a front surface sheet, a back surface sheet, and an absorbent core arranged between them, and having a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction.
In the absorbent core, a plurality of recesses are formed in the rear portion of the core located behind the central position of the absorbent article in the vertical direction in a state of being dispersed in the vertical direction and the horizontal direction.
A central recess region having a plurality of the recesses is formed in the lateral central portion of the rear portion of the core, and lateral recess regions having a plurality of the recesses are formed on both sides of the central recess region.
The aspect ratio, which is the value obtained by dividing the vertical length of the concave portion by the horizontal length, is closer to 1.0 in the central concave portion region than in the lateral concave region.
Area of the recess, rather the size towards the central recessed area than the lateral recessed area,
The absorbent core has a rear recessed region having a plurality of recesses behind the central recessed region.
An absorbent article in which the aspect ratio of the recess is larger in the central recess region than in the rear recess region . The absorbent core has a central narrow portion and a core front portion and a core rear portion which are located before and after the central narrow portion and whose lateral length is longer than that of the central narrow portion. The absorbent article according to claim 1, wherein the central recessed region and the lateral recessed region are formed in the rear portion of the core. The absorbent article according to claim 1 or 2, wherein the area ratio of the recess is larger in the central recess region than in the lateral recess region. The absorbent article according to any one of claims 1 to 3 , wherein the aspect ratio of the recess is larger in the lateral recess region than in the central recess region. The invention according to any one of claims 1 to 4 , wherein the recesses obliquely oriented so as to face the corners are formed at the corners on the rear end side of the core and at both ends in the lateral direction. Absorbent article. The absorbent article according to any one of claims 1 to 5 , wherein the recess is a penetrating portion penetrating the absorbent core or is formed to have a lower basis weight than other portions. .. The absorbent article according to any one of claims 1 to 6 , which is a pants-type worn article for adults.

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