WO2020138177A1

WO2020138177A1 - Absorbent article

Info

Publication number: WO2020138177A1
Application number: PCT/JP2019/050843
Authority: WO
Inventors: 礼奈古川; 優子福田
Original assignee: 花王株式会社
Priority date: 2018-12-26
Filing date: 2019-12-25
Publication date: 2020-07-02
Also published as: CN216823895U

Abstract

An elastic member (7) extends, in the same direction in a state in which the elastic member (7) can express elasticity in the longitudinal direction (X), between an absorber (5) and an outermost layer sheet (10) in the lateral-direction (Y) center of an absorber placement region (5T), and the elastic member (7) is present at least on the rear side (R). A low-basis-weight portion (52) having a smaller mass per unit area of the absorbent material than the two lateral-direction (Y) side portions extends in the longitudinal direction (X) in the lateral-direction (Y) center of the absorber (5). In plan view, an elastic region (7T) in which the elastic member (7) is present and the low-basis-weight portion (52) overlap.

Description

Absorbent article

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

A disposable diaper, which is a type of absorbent article, is typically arranged on an absorbent body containing an absorbent material such as a hydrophilic fiber or a water-absorbent polymer, and on a side closer to the wearer's skin than the absorbent body. And a back sheet arranged on the side farther from the wearer's skin than the absorber. The disposable diaper having such a structure is required to be fitted to the wearer's body with good adhesiveness and to be excellent in leakage prevention of excrement such as urine and feces.

In Patent Document 1, as a disposable diaper that improves the feel of a sheet that comes into contact with the wearer's skin and gives a softer impression to a wearer such as a mother, a low weighted portion made of a notch is provided in an absorber. Formed, while arranging an auxiliary sheet between the topsheet and the absorber, disposing a crotch stretch part between the absorber and the backsheet in the crotch region, in plan view, the crotch stretch part, What is made so as to overlap the low basis weight portion, the absorber and the auxiliary sheet is described. The low basis weight portion extends in the lateral direction on both side portions along the longitudinal direction of the absorber. The crotch elastic part is composed of an elastic sheet or a plurality of thread-shaped or band-shaped elastic members. The vertical direction here is a direction corresponding to the front-back direction of the wearer of the absorbent article, and the horizontal direction is a direction orthogonal to the vertical direction. According to the disposable diaper described in Patent Document 1, it is possible to more flexibly deform the region in which the crotch stretchable portion is arranged, absorb the shrinkage of the leg stretchable portion, and suppress the occurrence of wrinkles at unintended locations. Has been done.

Patent Document 2 discloses a pants-type absorbent article in which leakage of excrement such as menstrual blood is suppressed while obtaining an appearance like underwear, and is provided in the lateral center of the absorbent main body on the longitudinal rear side and from the absorbent body. Also, there is described that the stretchable portion that stretches in the vertical direction is arranged on the non-skin side of the wearer. Patent Document 2 describes, as a specific example of the stretchable portion, a portion provided with four hip elastic members 41 that exhibit stretchability in the absorbent main body.

As an improved technique of a pants-type disposable diaper composed of pants and a liquid-absorbent pad located on the inner surface of the pants, an elastic member extending in a longitudinal direction is provided on an outer surface of a back sheet forming the pad. It is described that the member is arranged in an extended state, and the pad is lifted from the inner surface of the pants to the wearer's skin side by contraction of the elastic member. According to the pants-type disposable diaper described in Patent Document 3, the liquid-absorbent pad can be brought into close contact with the wearer's skin, and even if the pants are slipped down, the close-contact state of the pad can be maintained. Has been done.

JP, 2016-7515, A JP, 2018-267, A JP, 2003-62009, A

The present invention has a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction, and a front side portion disposed on the wearer's abdominal side when worn with the center of the vertical direction as a boundary. An absorber containing an absorbent material, which is divided into a rear side portion arranged on the back side of the wearer, a surface sheet arranged closer to the wearer's skin than the absorber, and the absorber. And an outermost sheet that is disposed farther from the wearer's skin and that forms an outer surface that is visible from the outside. At a central portion in the lateral direction of the absorber disposing region that overlaps the absorber in a plan view and between the absorber and the outermost layer sheet, the elastic member is capable of exhibiting stretchability in the longitudinal direction. Extending in the longitudinal direction, the elastic member is present at least on the rear side. At the central portion of the absorbent body in the lateral direction, a low basis weight portion having a smaller mass per unit area of the absorbent material than both lateral portions of the absorbent body extends in the longitudinal direction. In a plan view, the stretchable region where the elastic member exists and the low basis weight portion overlap.

FIG. 1 is a perspective view schematically showing a natural state of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side (inner surface side) in the expanded and expanded state of the diaper shown in FIG. 1. FIG. 3 is a cross-sectional view schematically showing a cross section taken along the line II of FIG. FIG. 4 is an enlarged cross-sectional view showing an enlarged and simplified main part of FIG. FIG. 5: is a figure which shows typically the mode of the principal part shown in FIG. 4 in the wearing state of the diaper 1 shown in FIG. FIG. 6 is a view corresponding to FIG. 2 of another embodiment of the absorbent article of the present invention. FIG. 7 is a view corresponding to FIG. 2 of still another embodiment of the absorbent article of the present invention. FIG. 8 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention. FIG. 9 is a view corresponding to FIG. 4 of still another embodiment of the absorbent article of the present invention.

Detailed Description of the Invention

One of the technical challenges for absorbent articles, typified by disposable diapers, is the improvement of absorbent performance for loose stools. Soft stool is a fecal matter that is often found in young children, and is highly viscous and fluid. Therefore, soft stool is difficult to be absorbed by the absorber inside the diaper, and soft stool excreted in the crotch of the diaper may spread on the back side through the surface sheet and leak to the outside. If loose stools spread from the crotch to the back side, the inner surface of the back side of the diaper becomes dirty with loose stools even if it does not leak to the outside of the diaper. May cause inconveniences such as giving a burden to the user and causing a skin trouble of the wearer.

As means for improving the soft stool absorption performance, conventionally, a surface sheet is provided with a concavo-convex structure in which soft stools are difficult to diffuse, a member capable of absorbing soft stool is introduced into the crotch separately from the absorber, and a pocket structure is provided. Although measures such as securing a space that can accommodate loose stools have been studied, these conventional measures can prevent leakage of loose stools from the back side, but sufficiently prevent diffusion of loose stools on the back side. The current situation is that it cannot be done.

The present invention relates to an absorbent article which has excellent fit to the wearer's body and can effectively prevent diffusion of excrement such as loose stools to the back side and leakage from the back side.

Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may be different from the actual one.

1 to 3 show a pants-type disposable diaper 1 which is one embodiment of the absorbent article of the present invention. The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the abdomen side to the dorsal side through the crotch portion, and a lateral direction Y orthogonal to the longitudinal direction X, and has a longitudinal center (vertical center). An absorbent body 5 that is divided into a front side portion F arranged on the wearer's ventral side and a rear side portion R arranged on the wearer's back side with the line CLx) as a boundary, and that contains an absorbent material; A surface sheet 3 disposed closer to the wearer's skin than the absorbent body 5, and an exterior that is disposed farther from the wearer's skin than the absorbent body 5 and forms an outer surface of the diaper 1 that is visible from the outside. The body 10 (outermost layer sheet).

The diaper 1 is a so-called pants-type disposable diaper, and includes an absorbent main body 2 including an absorbent body 5, and an exterior body 10 arranged on the side farther from the wearer's skin than the absorbent main body 2, that is, on the non-skin side. The both side edges of the exterior body 10 on the front side portion F and the exterior body 10 on the rear side portion R along the longitudinal direction X are joined to each other by a known joining means such as an adhesive, heat sealing, or ultrasonic sealing. As shown in FIG. 1, a pair of side seal portions S, S, a waist opening WH through which a wearer's torso is inserted, and a pair of leg openings LH and LH through which a wearer's lower limb is formed are formed. Has been done.

As shown in FIG. 2, the diaper 1 has a ventral side portion A disposed on the ventral side of the wearer, a dorsal side portion C disposed on the back side, and a crotch portion B located therebetween as shown in FIG. Have in direction X. The abdominal part A is a part of the front part F, the dorsal part C is a part of the rear part R, and the crotch part B is located at the boundary between the front part F and the rear part R. In the vertical direction X. The crotch portion B includes an excretion portion facing portion (not shown) that faces the excretion portion (penis, anus, etc.) of the wearer when the diaper 1 is worn. The vertical center line CLx is a virtual straight line that extends in the horizontal direction Y by bisecting the diaper 1 in the expanded and expanded state as shown in FIG. 2 in the vertical direction X. The "expanded and expanded 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 elastic member of each part of the diaper 1 in the expanded state is expanded to have a design dimension (any influence of the elastic member). It is the same as the dimension when it is expanded in a flat shape in the excluded state).

The absorbent main body 2 has a rectangular shape in plan view when the diaper 1 is in the expanded and expanded state as shown in FIG. 2, and extends in the longitudinal direction X from the front side F to the rear side R, and the longitudinal direction thereof is It is arranged in the central portion of the exterior body 10 in the lateral direction Y so as to match the longitudinal direction X of the diaper 1 in the expanded and expanded state, and is joined to the exterior body 10 with an adhesive.

As shown in FIGS. 2 and 3, the absorbent main body 2 has a liquid-permeable surface sheet 3 forming a skin-facing surface, and a liquid-impermeable or liquid-impermeable or water-repellent surface forming a non-skin-facing surface. A back sheet 4 and a liquid-retaining absorber 5 interposed between the two

sheets

3 and 4 are provided, and these are integrated by a known joining means such as an adhesive.

In the present specification, the “skin-facing surface” is a surface of an absorbent article or a constituent member thereof (eg, an absorbent body) that faces the skin side of the wearer when the absorbent article is worn, that is, the skin of the wearer relatively. Is a side closer to the "non-skin-facing surface" is a surface of the absorbent article or its constituent members that faces away from the skin side when the absorbent article is worn, that is, relatively far from the wearer's skin. On the side. The term "when worn" as used herein means a state in which a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained.

As the topsheet 3, the backsheet 4, and the absorber 5, those conventionally used in this type of absorbent article can be used without particular limitation. As the topsheet 3, for example, various non-woven fabrics and apertured films can be used. As the back sheet 4, for example, a resin film or a laminate of a resin film and a non-woven fabric can be used. The absorbent body 5 contains an absorbent material. As the absorbent material, those used as the material of the absorbent body in this type of absorbent article can be used without particular limitation, and examples thereof include wood pulp and hydrophilic materials. Chemically treated synthetic fibers, water-absorbing polymers and the like can be mentioned. The absorbent body 5 only needs to contain an absorbent material, and its form is not particularly limited. For example, it may be a laminated body obtained by laminating the absorbent material, or a sheet shape containing the absorbent material. The absorption structure may be

As shown in FIG. 3, the absorbent core 5 of the present embodiment includes an absorbent core 50 containing an absorbent material and a core wrap sheet that covers the outer surface (skin-facing surface, non-skin-facing surface) of the absorbent core 50. And 51. The absorptive core 50 is typically a laminated fiber body obtained by laminating absorbent materials. As the core wrap sheet 51, for example, a liquid permeable sheet such as paper, various non-woven fabrics, and apertured films can be used. The absorbent core 50 and the core wrap sheet 51 may be joined by a known joining means such as a hot melt adhesive.

The core wrap sheet 51 may be composed of one sheet, or may be composed of a plurality of sheets. The core wrap sheet 51 composed of one sheet has, for example, a width of 2 times or more and 3 times or less of the length of the absorbent core 50 in the lateral direction Y, and the entire area of the skin facing surface of the absorbent core 50. And extending outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent core 50, and the extending portion is wrapped around the non-skin facing surface side of the absorbent core 50, The entire non-skin-facing surface of the absorbent core 50 may be covered. In the core wrap sheet 51 composed of one sheet as described above, the portion that covers the skin-facing surface of the absorbent core 50 is the skin-side core wrap sheet, and the portion that covers the non-skin-facing surface of the absorbent core 50. Is the non-skin side core wrap sheet. The non-skin side core wrap sheet is arranged on the non-skin facing surface of the absorbent core 50, and covers the low basis weight portion 52 described later. The core wrap sheet 51 composed of a plurality of sheets is, for example, one skin side core wrap sheet that covers the skin facing surface of the absorbent core 50, and the skin side core wrap sheet, which are separate bodies. , One non-skin side core wrap sheet that covers the non-skin facing surface of the absorbent core 50.

As shown in FIGS. 2 and 3, liquid-resistant or water-repellent and breathable leak-proof cuff-forming sheets 60 are included on both sides of the absorbent body 2 in the skin-facing surface along the longitudinal direction X. A pair of configured

leakproof cuffs

6, 6 is provided. Each of the pair of leak-proof

cuff forming sheets

60, 60 has one end side in the lateral direction Y fixed to another component (the back sheet 4 and the inner layer sheet 12 in the illustrated embodiment) to form a fixed end portion. , The other end in the lateral direction Y is a free end that is not fixed to another component, and a thread-shaped or band-shaped elastic member 61 for forming a leak-proof cuff is arranged in the longitudinal direction X in a stretched state. Has been done. In the illustrated form, the number of the elastic members 61 arranged on each leak-proof cuff 6 is one, but it may be plural. The leak-proof cuff 6 stands up at least in the crotch part B when the elastic member 61 arranged in the stretched state contracts when the diaper 1 is worn, whereby the excrement such as loose stool flows outward in the lateral direction Y. Is blocked.

The outer casing 10 forms the outer shape of the diaper 1 in the expanded and stretched state as shown in FIG. 2, and the peripheral edge of the outer casing 10 has contour lines of the diaper 1 in that state, that is, the ventral side portion A, the crotch portion B, and The contour line of each of the back side portions C is formed. As shown in FIG. 2, the exterior body 10 has a rectangular shape in which the length in the lateral direction Y is longer than the lengthwise direction X in the ventral side portion A and the back side portion C, and in the crotch portion B, the exterior body. A pair of leg edge portions LS, LS that are both side edge portions along the vertical direction X of 10 are curved in a convex arc shape toward the center in the horizontal direction Y, and in the plan view as shown in FIG. The central area of X is in the shape of an hourglass that is constricted inward in the lateral direction Y.

As shown in FIG. 3, the exterior body 10 of the present embodiment has an outer layer sheet 11 and an inner layer sheet 12 in order from the absorbent body 5, and is configured to include a laminated body of both

sheets

11 and 12. In the worn state of the diaper 1, the outer layer sheet 11 is located on the side farther from the wearer's body to form the outer surface of the diaper 1, that is, the non-skin-facing surface, and the inner layer sheet 12 is located on the side closer to the wearer's body. To form the inner surface of the diaper 1, that is, the skin-facing surface. The outer layer sheet 11 and the inner layer sheet 12 are joined and integrated with each other at a predetermined portion via a joining means such as an adhesive. More specifically, the outer layer sheet 11 is a member that forms the outer surface of the diaper 1 that is visible from the outside.

The outer layer sheet 11 of the present embodiment is longer than the inner layer sheet 12 in the longitudinal direction X, has a portion extending from the edge of the inner layer sheet 12 in the longitudinal direction X, and the extending portion of the outer layer sheet 11 Is folded back to the skin facing surface side of the inner layer sheet 12 to cover the end portion of the absorbent main body 2 in the vertical direction X. The

sheets

11 and 12 that form the exterior body 10 may be the same type of sheet or different types of sheets. The

sheets

11 and 12 typically do not have stretchability, but may have stretchability as long as the predetermined effects of the present invention are not impaired. Non-stretchable sheets having no stretchability that can be used as the

sheets

11 and 12 include, for example, non-woven fabrics produced by various manufacturing methods. Specific examples thereof include spunbonded non-woven fabrics, air-through non-woven fabrics, and needle punched non-woven fabrics.

In the present specification, “stretchability” means the property of being stretchable in a predetermined direction and contracting when the stretch is released. The fact that the sheet is not substantially stretchable in a certain direction (is non-stretchable) means that the sheet hardly stretches even if a pulling force is applied to the sheet in the certain direction. To do. For example, when a sample having a length of 15 cm and a width of 5 cm is pulled in the longitudinal direction by a material tensile tester such as Tensilon and the breaking elongation of the sample is 10% or less, The sample has substantially no stretch in the longitudinal direction. The elongation at break can be calculated by (length of the sample at break-original length of the sample)/(original length of the sample)×100.

In the diaper 1 of the present embodiment, as shown in FIGS. 1 and 2, a state in which a thread-shaped or band-shaped elastic member 13 for forming a waist gathers is extended in the lateral direction Y on the abdominal part A and the dorsal part C. The plurality of elastic members 13 are intermittently arranged in the longitudinal direction X at predetermined intervals. In this way, since the elastic member 13 is arranged in a state in which its elasticity is exhibited, the abdomen side portion A and the back side portion C, which are the arrangement portions, are substantially continuous over the entire circumference. An annular waist gather is formed. The exterior body 10 on the abdomen A and the back C may have a non-stretchable region where the stretchability of the elastic member 13 is obstructed in a region overlapping with the absorbent main body 2 in plan view. Even in such a case, the abdominal part A and the dorsal part C as a whole have elasticity in the lateral direction Y due to the provision of the elastic member 13 fixed in a stretched state in the lateral direction Y. .. Further, one or a plurality of elastic members 14 for forming leg gathers, which are thread-shaped or strip-shaped, are arranged in an extended state at the leg edge portions LS forming the opening edge portions of the pair of leg opening portions LH, LH. As a result, annular leg gathers that are substantially continuous over the entire circumference are formed at the opening edge portions of each of the pair of leg opening portions LH, LH. These gather-forming

elastic members

13 and 14 are both sandwiched and fixed between the outer layer sheet 11 and the inner layer sheet 12 constituting the outer casing 10 by a joining means such as an adhesive.

One of the main features of the diaper 1 is, as shown in FIGS. 2 to 4, a region (absorber arrangement) that overlaps with the absorber 5 in plan view (projection view in the thickness direction of the absorber 5) at the rear side R. In the region 5T), the elastic member 7 extends in the same direction as the elastic member 7 in the longitudinal direction X, and the low basis weight portion 52 is formed in the longitudinal direction X in the center of the absorbent body 5 in the lateral direction Y. The points that are extended to. Hereinafter, the characteristic part of the diaper 1 will be described in detail.

In the diaper 1, as shown in FIG. 2, the elastic member 7 is provided in the longitudinal direction X between the absorbent body 5 and the exterior body 10 (outermost layer sheet) at the central portion in the lateral direction Y of the absorbent body placement region 5T. It extends in the same direction in a state where elasticity can be expressed.

In the present embodiment, two thread-shaped elastic members 7 are intermittently arranged in the lateral direction Y at the central portion of the absorber placement region 5T in the lateral direction Y. The two elastic members 7 are arranged symmetrically with respect to the center (horizontal center line CLy) of the absorbent body 5 (diaper 1) in the lateral direction Y. The horizontal center line CLy is a virtual straight line that extends in the vertical direction X by bisecting the diaper 1 in the expanded and expanded state as shown in FIG. 2 in the horizontal direction Y.

In the present embodiment, the two elastic members 7 respectively cover the non-skin facing surface of the absorbent core 50 in the core wrap sheet 51, that is, the non-skin facing surface of the absorbent core 50, as shown in FIG. 3. And is joined to the non-skin facing surface (non-skin facing surface 5a of the absorbent body 5) of the non-skin side core wrap sheet that covers the low basis weight portion 52 in the state of being extended in the vertical direction X. Thus, the elastic member 7 extends in the vertical direction X in a state where it can exhibit elasticity in the vertical direction X. The means for joining the elastic member 7 to the core wrap sheet 51 is not particularly limited, and a known joining means such as a hot melt adhesive can be used.

The form of the elastic member 7 is not limited to a thread form, and various forms can be adopted as long as the predetermined effects of the present invention are exhibited, and for example, a band form or a sheet form may be used. The sheet-shaped elastic member is a so-called elastic sheet, and may be, for example, a lattice shape (mesh shape) or a film shape. Further, the arrangement of the elastic members 7 is not particularly limited, and not only the plurality of thread-shaped or band-shaped elastic members are intermittently arranged in the lateral direction Y as in the present embodiment, but also a predetermined area (for example, described later). One sheet-like elastic member (elastic sheet) having the same area as the non-skin facing surface side of the low basis weight portion 52 may be arranged, or both the thread-like elastic member and the sheet-like elastic member may be arranged. Good. However, from the viewpoint of the amount of contraction, the elastic member 7 is preferably formed of a thread-like elastic member.

The elastic member 7 needs to exist at least in the rear side portion R in consideration of the action and effect described later. Also in this embodiment, as shown in FIG. 2, the two elastic members 7 are both present on the rear side portion R. However, the elastic member 7 may be present in the front side portion F, for example, the elastic member 7 extends across the boundary (vertical center line CLx) between the front side portion F and the rear side portion R in the vertical direction X. The elastic members 7 may be present on both the front side portion F and the rear side portion R.

In the diaper 1, as described above, the elastic member 7 exhibits elasticity in the longitudinal direction X in the absorber placement region 5T on the rear side R and between the absorber 5 and the exterior body 10 (outermost layer sheet). In addition to extending in the same direction in a possible state, the "mass per unit area of the absorbent material" is further provided in the central portion of the absorbent body 5 in the lateral direction Y rather than both side portions in the lateral direction Y. The low basis weight portion 52 having a small (so-called basis weight or basis weight) extends in the vertical direction X.

The absorber 5 of the present embodiment is configured to include an absorbent core 50 containing an absorbent material, and the low basis weight portion 52 is formed on the absorbent core 50. The low basis weight portion 52 is a portion where the basis weight is less than both side portions of the low basis weight portion 52 of the absorbent body 5 (absorbent core 50) in the lateral direction Y. 1) Low basis weight A form in which the absorbent material does not exist in the portion 52 (that is, a form in which the absorbent material has a basis weight of zero) and a form 2) in which the absorbent material exists in the low basis weight portion 52 are included. As shown in FIG. 3, the low basis weight portion 52 of the present embodiment has the form of 1) above, and is a through hole that penetrates the absorbent core 50 in the thickness direction. The low basis weight portion 52, which is a through hole, has a rectangular shape in a plan view as shown in FIG. 2, and its longitudinal direction coincides with the longitudinal direction X.

In the low basis weight portion 52 in the form of the above 2), a smaller amount of absorbent material is present than the both side portions in the lateral direction Y of the low basis weight portion 52 in the absorber 5. Typically, the mass per unit area of the absorbent material present in the low basis weight part 52 is relative to the mass per unit area of the absorbent material present on both sides in the lateral direction Y of the low basis weight part 52. , 80 mass% or less. Regarding the density of the absorptive material, the low basis weight portion 52 in the form of 2) is lower than both side portions in the lateral direction Y, but the thickness is not always smaller in the former than in the latter. In some cases, the former and the latter may be the same or the former may be larger than the latter.

The method for forming the low basis weight portion 52 is not particularly limited. As an example of the method for forming the low basis weight portion 52, in the step of stacking the absorbent material such as wood pulp during the production of the absorbent core 50, intentionally stacking the absorbent material in the portion where the low basis weight portion 52 is to be formed. The method of inhibiting is mentioned. The method for forming the low basis weight portion 52 can be implemented by a conventionally known method for manufacturing an absorbent core. For example, a molding material formed on the outer peripheral surface of a rotary drum is formed by using a core forming material supplied by being placed on an air flow. In the method of manufacturing the absorbent core 50 by suctioning and depositing on a mold, a mold having a predetermined pattern, for example, a portion corresponding to the low basis weight portion 52 is projected upward as compared with the peripheral portion. It can be carried out by using a molding die. In addition, as another example of the method for forming the low basis weight portion 52, an absorbent core 50 that does not have the low basis weight portion 52 is manufactured, and after a die cutting process, a cutting process, or the like is performed on a predetermined portion of the absorbent core 50. There is a method of forming the low basis weight portion 52 by processing.

In the diaper 1, in a plan view (projection view in the thickness direction of the absorber 5), the stretchable region 7T where the elastic member 7 exists and the low basis weight portion 52 overlap, that is, the stretchable region 7T in the thickness direction of the absorber 5. It is characterized in that it overlaps with the low basis weight portion 52. In this embodiment, the shaded portion in FIG. 2 is the stretchable region 7T. The stretchable region 7T normally has stretchability in the vertical direction X, similarly to the elastic member 7 arranged therein.

The stretchable region 7T is the elastic member 7 in the plan view of the diaper 1 as shown in FIG. 2, that is, "the central portion in the lateral direction Y of the absorber placement region 5T and the absorber 5 and the outermost sheet (in the present embodiment, the exterior. The "elastic member 7" referred to here is the elastic member 7 which is disposed between the body 10) and extends in the longitudinal direction X. That is, it means "the elastic member 7 fixed in an elongated state in the longitudinal direction X". For example, as a typical fixing form of the elastic member 7, both ends in the longitudinal direction of the elastic member 7 are not fixed to another member (for example, the core wrap sheet 51), or even if fixed, they are fixed in an expanded state. There is a mode in which a portion sandwiched between both ends in the longitudinal direction of the elastic member 7 (hereinafter, also referred to as “central portion in the longitudinal direction”) is fixed to another member in an expanded state. In such a fixed form of the elastic member 7, since the elastic member 7 is capable of exhibiting elasticity only in the central portion in the longitudinal direction, a portion overlapping with the central portion in the longitudinal direction of the elastic member 7 in a plan view is an elastic region. It is 7T. That is, when a part (for example, both ends in the longitudinal direction) of the elastic member 7 cannot exhibit elasticity, the remaining part (for example, the central part in the longitudinal direction) excluding the part from the elastic member 7 and a plan view. The overlapping portion is a stretchable region 7T.

Further, when a plurality of elastic members 7 are intermittently arranged in the lateral direction Y as in the present embodiment, the plurality of elastic members 7 are located on the outermost side on one side in the lateral direction Y in a plan view. Of the region sandwiched between the outer edge of the elastic member 7 located and the outer edge of the elastic member 7 located on the outermost side on the other side in the lateral direction Y, the portion capable of exhibiting elasticity is the elasticity region 7T. is there. Here, the “outer edge of the elastic member 7 ”is one of both side edges of the elastic member 7 along the longitudinal direction X that is relatively far from the center (lateral center line CLy) in the lateral direction Y of the absorber 5. It is a side edge. For example, in this embodiment, as shown in FIG. 2, two elastic members 7 are intermittently arranged in the lateral direction Y, and the two elastic members 7 can exhibit elasticity over the entire length in the longitudinal direction. Since it is in the state, the portion that overlaps with the two elastic members 7 and the portion sandwiched between the two elastic members 7 (the hatched portion in FIG. 2) in the plan view are the stretchable regions 7T. If the two longitudinal ends of each of the two elastic members 7 cannot exhibit elasticity, the portions other than the longitudinal ends of each of the two elastic members 7 and the portion sandwiched between them in plan view. Is a stretchable region 7T.

In the diaper 1, as described above, i) the elastic member 7 can develop elasticity in the longitudinal direction X at least in the absorber placement region 5T of the rear side R on the side farther from the wearer's skin than the absorber 5. Ii) the low basis weight portion 52 extends in the vertical direction X at the center of the absorbent body 5 in the horizontal direction Y, and iii) in a plan view (projection view in the thickness direction of the absorbent body 5). )), the stretchable region 7T in which the elastic member 7 exists and the low basis weight portion 52 overlap each other, and the diaper 1 having the above-mentioned configurations i) to iii) has a good fit to the wearer's body, particularly the wearer's buttocks. It has excellent fit to the groove (glutes) and can effectively prevent diffusion of excrement such as loose feces to the back side and leakage from the back side. That is, the central portion in the lateral direction Y of the absorber placement region 5T of the rear side portion R where the elastic member 7 is located is a portion corresponding to the gluteal cleft of the wearer of the diaper 1, and the gluteal cleft corresponding portion. In the presence of the elastic region 7T in which the elastic member 7 arranged on the non-skin side of the absorbent body 5 extends in the longitudinal direction X in an expanded state, when the diaper 1 is worn, the elastic member 7 contracts, A part of the absorbent body 5 that overlaps with the stretchable region 7T in a plan view can be deformed along the gluteal cleft of the wearer, and as a result, the fit to the gluteal cleft can be improved. However, since the absorbent body 5 is basically a member having a relatively large basis weight and a high rigidity in order to secure the necessary absorption performance, there is a concern that the elastic body 7 will not be deformed by the contraction of the elastic member 7. In this regard, in the diaper 1, since the low basis weight part 52 is provided in the absorber 5 and the low basis weight part 52 and the stretchable region 7T overlap each other in a plan view, such a concern is eliminated, and the diaper 1 When the user wears the diaper 1, the diaper 1 adheres to the buttocks of the wearer with good fit, centering on the overlapping portion of the low basis weight portion 52 and the stretchable region 7T, so that excretion of excrement to the back side or leakage from the back side can be prevented. It can be effectively prevented.

In particular, in the present embodiment, the low basis weight portion 52 is a through hole, and since the low basis weight portion 52 does not substantially contain an absorbent material, the low basis weight portion 52 (through hole) is used as a starting point when the diaper 1 is worn. As the absorbent body 5 is easily bent and the absorbent body 5 is easily deformed along the gluteal cleft of the wearer, the above-described action and effect can be more reliably exhibited.

The low basis weight part 52 may be arranged at a position where at least a part of the stretchable region 7T may overlap with each other in plan view. As described above, since the elastic member 7 of the expansion/contraction region 7T is arranged at least in the central portion in the lateral direction Y of the absorber arrangement region 5T in the rear side portion R, the low basis weight part 52 is also at least at the same position as the elastic member 7. Will be placed.

From the viewpoint of more reliably producing the above-described effects, the vertical length L1 (see FIG. 2) of the overlapping portion of the stretchable region 7T and the low basis weight portion 52 in plan view is the vertical direction of the absorber 5. The total length of X is preferably 10% or more, more preferably 15% or more. On the other hand, if the length L1 in the longitudinal direction of the overlapping portion of the stretchable region 7T and the low basis weight portion 52 is too long, there is a possibility that the absorption performance may be deteriorated and inconvenience such as discomfort when the diaper 1 is attached may occur. The upper limit of the directional length L1 is preferably 50% or less, more preferably 35% or less with respect to the entire length of the absorbent body 5 in the longitudinal direction X.

Regarding the above-mentioned “total length of the absorbent body 5 in the vertical direction X”, the absorbent body 5 is composed of a plurality of members (the absorbent core 50, the core wrap sheet 51) as in the present embodiment, and each member has a vertical direction. If the total lengths of X are different, the total length in the vertical direction X of the member having the longest total length in the vertical direction X among the constituent members of the absorber 5 is the “total length in the vertical direction of the absorber 5” unless otherwise specified. .. For example, when the core wrap sheet 51 extends from the front and rear ends of the absorbent core 50 in the vertical direction X, the entire length of the core wrap sheet 51 in the vertical direction X (the length from one end to the other end in the vertical direction X). ) Is the total length of the absorber 5 in the vertical direction X.

From the viewpoint of more reliably producing the above-described action and effect, the overlapping portion of the stretchable region 7T and the low basis weight portion 52 in the plan view is the overall length of the shorter one of the two in the vertical direction X. Of 50% or more, particularly 70% or more, in the longitudinal direction X is preferable. In the form shown in FIG. 2, the low basis weight portion 52 has a longer length in the vertical direction X than the stretchable area 7T, and the stretchable area 7T entirely overlaps the low basis weight portion 52 in the vertical direction X in a plan view. In addition, the low basis weight portion 52 extends outward in the vertical direction X from the front end in the vertical direction X (one end on the front side portion F side) of the overlapping portion with the stretchable region 7T. Therefore, in the form shown in FIG. 2, the overlapping portion of the stretchable region 7T and the low basis weight portion 52 has a shorter total length of the stretchable region 7T in the vertical direction X, which is the shorter of the two in total. %, and the length L1 in the vertical direction of the overlapping portion (see FIG. 2) is the same as the total length in the vertical direction X of the stretchable region 7T.

In the present invention, the low basis weight part 52 and the stretchable region 7T may have the same or different lengths in the vertical direction X, and when the lengths in the vertical direction X are different from each other, which is longer. I don't mind. The length of the low basis weight portion 52 in the vertical direction X is preferably 10% or more, more preferably 15% or more, with respect to the entire length of the absorbent body 5 in the vertical direction X. The length of the stretchable region 7T in the vertical direction X is preferably 10% or more, more preferably 15% or more, with respect to the entire length of the absorbent body 5 in the vertical direction X.

The length Y of the low basis weight part 52 in the lateral direction, that is, the width W1 (see FIG. 4) is preferably 1% or more, more preferably 3% or more, with respect to the length (width) of the absorbent body 5 in the lateral direction Y. , And preferably 40% or less, more preferably 20% or less. The “width of the absorbent body” here means the maximum width when the width of the absorbent body is not constant, and when the absorbent body includes an absorbent core as in the present embodiment, the absorbent core is Means the maximum width.
The width W1 of the low basis weight portion 52 in the lateral direction Y is preferably 1 mm or more, more preferably 5 mm or more, and preferably 50 mm or less, more preferably 30 mm or less.

The length in the lateral direction Y of the stretchable region 7T, that is, the width W2 (see FIG. 4) may be the same as or different from the width W1 of the low basis weight portion 52, and when both widths are different, whichever is longer It does not matter, but when the diaper 1 is worn, it promotes the bending of the absorbent body 5 starting from the low basis weight portion 52 (see FIG. 5) to diffuse the excrement such as loose stools to the back side or leak from the back side. From the viewpoint of further reliably preventing the protrusion, the width W1 of the low basis weight portion 52 is preferably equal to or longer than the width W2 of the stretchable region 7T. The ratio of the width W1 of the low basis weight portion 52 to the width W2 of the stretchable region 7T is, as width W1/width W2, preferably 1 or more, more preferably 1.2 or more, and preferably 3 or less, more preferably 2 It is as follows.
For example, when the two thread-shaped elastic members 7 are intermittently arranged in the lateral direction Y as in the present embodiment, the portion of the absorbent body 5 that overlaps with the stretchable region 7T in plan view is the buttock of the wearer of the diaper 1. From the viewpoint of promoting deformation along the crack, the width W2 of the stretchable region 7T is preferably 5 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less.

In the case where the two thread-shaped elastic members 7 are intermittently arranged in the lateral direction Y as in the present embodiment, the pitch between the elastic members 7 adjacent to each other in the lateral direction Y (the center of the adjacent elastic members 7 The distance P1 between the parts (see FIG. 4) is preferably 1 mm or more, more preferably 3 mm or more, and preferably 50 mm or less, more preferably 30 mm or less.

In the diaper 1 of the present embodiment, as shown in FIG. 4, there is an absorber non-bonding region 5U in which the absorber 5 and the outer package 10, which is the outermost layer sheet, are not directly or indirectly bonded. Here, "directly joined" means that the absorber 5 and the outermost layer sheet are joined and integrated while contacting each other without interposing other members, and "indirectly joined" means This means that another member is interposed between the absorbent body 5 and the outermost layer sheet, and the absorbent body 5 and the outermost layer sheet are joined and integrated with the other member interposed therebetween. Such joining means is not particularly limited and is typically an adhesive such as a hot melt type adhesive. In this embodiment, since the backsheet 4 is interposed between the absorber 5 and the exterior body 10 (outermost layer sheet), the absorber 5 and the exterior body 10 are joined and integrated with the backsheet 4 interposed therebetween. In this case, the absorber 5 and the exterior body 10 are indirectly joined. However, this is not the case in the present embodiment, and in the absorbent body non-bonding region 5U, the absorbent body 5 and the exterior body 10 (outermost layer sheet) are not integrated and are in a state where they can move independently. is there.

Then, in the diaper 1 of the present embodiment, the absorber non-bonding region 5U overlaps with the overlapping part of the stretchable region 7T and the low basis weight part 52 in plan view, and the absorber non-bonding region 5U in plan view. The elastic member 7 at the overlapping portion is not joined to the exterior body 10 (outermost layer sheet). That is, in the absorber non-joining region 5U, not only the absorber 5 but also the elastic member 7 located at the overlapping portion of the stretchable region 7T and the low basis weight portion 52 are joined to the exterior body 10 (outermost layer sheet). Absent.

Therefore, in the worn state of the diaper 1 of the present embodiment, as shown in FIG. 5, the absorbent body 5 overlaps the absorbent body non-bonding region 5U and the stretchable region 7T and the low basis weight portion 52 in plan view. The part overlapping with the part can move toward the wearer's skin side in a direction away from the exterior body 10 which is the outermost layer sheet by contraction of the elastic member 7. At this time, such a part of the absorber 5 is usually deformed so as to follow the shape of the wearer's body, more specifically, the buttocks of the wearer, as indicated by reference numeral 100. Further, at this time, the absorbent body 5 is bent so that the low basis weight portion 52 extending in the vertical direction X is the origin of the bending, and the low basis weight portion 52 is bent so as to project toward the wearer's body 100 side, and as shown in FIG. In a cross-sectional view along the direction Y, the low basis weight portion 52 is deformed into a V-shape or U-shape, and the low basis weight portion 52 located at the top of the V-shape or U-shape is arranged along the wearer's buttocks and the low basis weight portion is formed. The elastic member 7 enters 52. As used herein, "the elastic member 7 is inserted into the low basis weight portion 52" means that the elastic member 7 is located on both sides in the lateral direction Y of the low basis weight portion 52 of the absorbent body 5 in the transverse sectional view as shown in FIG. It means that the non-skin facing surface 5a intersects with the virtual extension line 5aL or is located closer to the wearer's body 100 beyond the virtual extension line 5aL. Thus, in the worn state of the diaper 1, the absorber 5 is deformed so as to float up from the member (rear sheet 4) located on the non-skin side, and the low basis weight portion 52 is arranged along the wearer's buttocks. In addition, since the elastic member 7 enters the low basis weight portion 52, the fitting property of the diaper 1 against the gluteal cleft is further improved, so that the diffusion of excrement to the back side and the leakage from the back side are further effective. Are prevented.

The effect of improving the fit property by the deformation of the absorbent body 5 is that the absorbent body non-bonding region 5U does not exist, and the absorbent body 5 (the low basis weight portion 52) and the elastic member 7 have the exterior body 10 (the outermost layer sheet). ) May be directly or indirectly joined to the absorbent body 5, but in that case, more specifically, the outer layer sheet 11 rather than the exterior body 10 forming the outer surface of the diaper 1 visible from the outside is the absorber 5. Similarly, the outer layer sheet 11 may be wrinkled, and the outer appearance of the diaper 1 may be impaired. As described above, the absorbent body non-bonding region 5U is effective for enhancing the fit of the diaper 1 and maintaining the appearance of the diaper 1 in a worn state.

From the viewpoint of more reliably exerting the above-described action and effect, particularly the effect of maintaining the appearance of the diaper 1 by the absorber non-bonding region 5U, as shown in FIG. It is preferable that the length (width) in the horizontal direction Y is longer than that in 7T, and the stretchable region 7T is continuous in the vertical direction X over 50% or more, particularly 70% or more of the entire length in the vertical direction X.

In the diaper 1A shown in FIG. 6, the absorbent body non-bonding region 5U, the low basis weight portion 52, and the stretchable region 7T have the same width or preferably have the same width in the same order. 52 has portions extending outward in the lateral direction Y from both side edges along the longitudinal direction X of the stretchable region 7T, and the absorbent body non-joining region 5U includes both side edges along the longitudinal direction X of the low basis weight part 52. Has a portion extending outward in the lateral direction Y from. On the other hand, regarding the total length in the vertical direction X, the lengths of the absorber non-bonding region 5U, the low basis weight portion 52, and the stretchable region 7T are the same as or preferably longer in the same order. 52 has a portion extending outward in the vertical direction X from the front and rear ends (both side edges along the horizontal direction Y) of the stretchable region 7T in the vertical direction X, and the absorbent body non-joining region 5U has a low basis weight portion 52. Has a portion extending outward in the vertical direction X from the front and rear ends in the vertical direction X (side edges along the horizontal direction Y).

From the same viewpoint, as shown in FIG. 7, it is also preferable that the entire stretchable region 7T overlaps with the absorber non-bonding region 5U in a plan view. Thereby, the effect of maintaining the outer appearance of the diaper 1 by the absorber non-bonding region 5U can be more reliably exhibited. In the diaper 1B shown in FIG. 7, not only the stretchable region 7T but also the low basis weight part 52 wider than the stretchable region 7T entirely overlaps with the absorber non-bonding region 5U in a plan view.

The length W3 in the lateral direction Y of the absorber non-bonding region 5U is preferably longer than the width W2 of the stretch region 7T as shown in FIGS. 6 and 7, and specifically, the width of the stretch region 7T. It is preferably twice or more than W2. The width W3 of the absorber non-bonding region 5U is preferably 10 mm or more and 130 mm or less, more preferably 30 mm or more and 120 mm or less.

From the viewpoint of more reliably producing the above-described effects, the low basis weight portion 52, the stretchable region 7T, and the absorber non-bonding region 5U are preferably present at least in the rear side portion R, respectively. These may exist in the front part F, but it is more preferable that they exist only in the rear part R.

In the diaper 1 of the present embodiment, as shown in FIG. 5, in the absorber non-bonding region 5U, between the absorber 5 and the elastic member 7 and the outer casing 10, which is the outermost layer sheet, a back sheet as an intermediate sheet. 4 is interposed and the back sheet 4 is joined to the exterior body 10 and is not joined to the absorber 5 and the elastic member 7. The point is that in the absorber

non-joining area

5U, 5 and the elastic member 7 located at the overlapping portion of the stretchable region 7T and the low basis weight portion 52 need not be directly or indirectly joined to the outermost layer sheet. The joining form of the sheet (back face sheet 4) and the outermost layer sheet (exterior body 10) is not limited to the form shown in FIG. As such a joining form in the absorber non-joining region 5U, for example, A) the intermediate sheet is joined to the absorber 5 and the elastic member 7, and is not joined to the outermost layer sheet, B). The intermediate sheet is not joined to the absorber 5 and the elastic member 7 and is joined to the outermost layer sheet (the form shown in FIG. 5), C) The intermediate sheet is the absorber 5 and the elastic member. 7 may be unbonded, and the outermost sheet may also be unbonded. Among the forms A) to C), the form A) has a configuration in which the intermediate sheet (rear sheet 4) bends following the deformation of the absorbent body 5 when the diaper 1 is worn, so that the outer surface (non-surface) of the intermediate sheet If the appearance of the intermediate sheet is enhanced by giving a pattern such as a pattern to the skin-facing surface), the effect of improving the appearance may be reduced. ) Or C) is preferred.

In the worn state of the diaper 1, the absorbent body 5 is deformed as shown in FIG. 5 to promote the elastic member 7 to enter the low basis weight portion 52, and to diffuse or excrete excrement such as loose feces to the back side. From the viewpoint of more surely preventing leakage from the surface sheet 3, the topsheet 3 preferably has an uneven structure in which the convex portions 30 and the concave portions 31 are alternately arranged in the lateral direction Y, as shown in FIG. 4. .. When the convex portion 30 has such a concavo-convex structure, when the absorbent body 5 is deformed so as to be bent at the formation position of the low basis weight portion 52, the topsheet 3 also easily bends following this and the low basis weight portion is also formed. The elastic member 7 easily enters 52. In the present embodiment, as shown in FIG. 4, the uneven structure is formed on the skin-facing surface of the topsheet 3, but it may be formed on the non-skin-facing surface (the surface facing the absorber 5) or on both surfaces. It may be formed. When the concavo-convex structure is formed on the skin-facing surface of the topsheet 3, the contact area with the wearer's skin is reduced, and therefore, in addition to the effects described above, the effect of improving the dry feeling can be achieved. The pattern of the concavo-convex structure included in the topsheet 3 is not particularly limited and can be any pattern, provided that the convex portions 30 and the concave portions 31 are alternately arranged in the lateral direction Y. As an example of the pattern of the concavo-convex structure, a pattern in which a plurality of convex portions 30 are arranged in a scattered manner and each convex portion 30 is surrounded by a concave portion 31 can be cited. As another example of the pattern of the concavo-convex structure, there is a pattern in which convex portions 30 extending in the vertical direction X and concave portions 31 extending in the vertical direction X are alternately arranged in the horizontal direction Y.

As described above, the absorbent body 5 of the present embodiment is arranged on the non-skin facing surface of the absorbent core 50 containing the absorbent material, and the non-skin side core that covers the low basis weight part 52. Where the core wrap sheet 51 including the wrap sheet is included, it is preferable that at least the non-skin side core wrap sheet is a non-woven fabric. The core wrap sheet 51 in which such a preferred form is adopted is typically a non-woven fabric in its entirety, that is, not only the non-skin side core wrap sheet but also the portion arranged on the skin-facing surface of the absorbent core 50. (Skin side core wrap sheet) is also a non-woven fabric. Since the non-skin side core wrap sheet is a nonwoven fabric, when the absorbent body 5 is deformed as shown in FIG. It is possible to more reliably prevent the excretion of the excrement of the human body to the back side and the leakage from the back side, and the non-skin side core wrap sheet is formed from other liquid permeable sheet such as paper. The strength of the non-skin side core wrap sheet itself can be improved as compared with the case where As the non-woven fabric forming the non-skin side core wrap sheet, various liquid-permeable non-woven fabrics manufactured by a known manufacturing method can be used without particular limitation. For example, spunbond-meltblown-spunbond (SMS) non-woven fabric. Are listed.

As shown in FIG. 2, a non-stretchable region 8T having no stretchability in both the vertical direction X and the horizontal direction Y is arranged outside both of the stretchable region 7T in the absorber placement region 5T in the horizontal direction Y. There is. If another stretchable region having stretchability in the vertical direction X and/or the horizontal direction Y exists at a position adjacent to the stretchable region 7T in the horizontal direction Y, the stretchable region 7T is affected by the other stretchable region. It is feared that the above-mentioned effect of improving the fit of the buttocks due to the cooperation of the stretchable region 7T and the low basis weight portion 52 is not sufficiently exerted. In order to eliminate such a concern, it is preferable that the non-stretchable regions 8T are arranged at both outer sides of the stretchable region 7T in the lateral direction Y at least in the absorber placement region 5T.

The non-stretchable region 8T has not only a form in which stretchability is zero in both the vertical direction X and the horizontal direction Y, but strictly speaking, although it has stretchability in the vertical direction X and/or the horizontal direction Y, its stretchability Is low and the level is considered to be substantially zero elasticity. For example, even if the elastic member is arranged in the extended state in the longitudinal direction X or the lateral direction Y in the vicinity of the absorber placement region 5T (typically, within 10 mm from the absorber placement region 5T), the rigidity is relatively high. Since the influence of the elasticity of the elastic member is greatly reduced by the influence of the large absorbent body 5, the non-stretchable region 8T exists outside the stretchable region 7T in the lateral direction Y. In addition, at the expansion/contraction region overlapping position that overlaps the absorber placement region 5T in the thickness direction and overlaps with the expansion/contraction region 7T in the vertical direction X, the leak-proof cuff forming elastic member 61 is provided as another elastic member separate from the elastic member 7. Even if the elastic member 61 is arranged in the stretched state, the arrangement portion of the elastic member 61 is the free end portion of the leak-proof cuff forming sheet 60 (leak-proof cuff 6) that is not substantially joined to the absorber 5, so that Even if the elastic member 61 for forming a leak cuff contracts, it contracts in a direction away from the absorbent body 5, and the absorbent body 5 is curved and deforms only along the shape of the buttocks of the wearer. The outside in the direction Y does not expand and contract, and therefore, the arrangement position of the elastic member 61 can be the non-expandable region 8T. In the present embodiment, the leak-proof cuff forming elastic member 61 is arranged on the skin side of the absorber placement region 5T without being joined to the absorber 5, and the placement position of the elastic member 61 can be the non-stretchable region 8T. On the other hand, since the leg gather forming elastic member 14 is relatively distant from the absorber 5 and is unlikely to be affected by the absorber 5, the elastic member 14 is not arranged in the non-stretchable region 8T.
It is preferable that the non-stretchable region 8T is located outside the stretchable region 7T in the lateral direction Y, preferably at a position separated by 10 mm or more, more preferably 15 mm or more.

In the diaper 1 of the present embodiment, as shown in FIG. 2, another member separate from the elastic member 7 is provided at the stretchable region overlapping position which overlaps with the stretchable region 7T in the longitudinal direction X, at or near the absorber placement region 5T. When the leak-proof cuff forming elastic member 61 extends in the same direction as the elastic member in the longitudinal direction X so that the elastic member 61 can expand and contract in the longitudinal direction, the elastic region 61 in the longitudinal direction X of the elastic region 7T at the elastic region overlapping position. The extension ratio X1 is preferably the same as or smaller than the extension ratio X2 in the longitudinal direction X of the other elastic member (leak-proof cuff forming elastic member 61) at the expansion/contraction region overlapping position. That is, it is preferable that a size relation of “expansion ratio X1 of the expansion/contraction region 7T in the vertical direction X≦ expansion/contraction ratio X2 of another elastic member at the expansion/contraction region overlapping position” is satisfied. The reason is as described above, and the stretchable region overlapping position can be replaced with the non-stretchable region 8T. The extension ratio can be adjusted by appropriately adjusting the type and thickness of the elastic member (for example, the elastic member 7 in the expansion/contraction region 7T) arranged in the region. As the other elastic member, for example, in addition to the leak preventive cuff forming elastic member 61, for example, an absorbent member gather forming elastic member or the like is provided in the vicinity of the absorbent body 5 (typically within 10 mm from the absorbent body 5). An elastic member arranged in the region () and in the longitudinal direction X along the absorber 5 in an expanded state can be exemplified. The extension ratio is measured by the following method.

<Measurement method of elongation ratio>
The absorbent article to be measured is unfolded as shown in FIG. 2 and maximally elongated in the longitudinal direction, and the measurement site in the absorbent article in the maximally expanded state (stretchable region 7T, stretchable region overlapping position, non-stretchable region 8T). From the above, a rectangular shape in plan view having a length of 50 mm and a width of 40 mm is cut out to obtain a test piece. At this time, the absorber is removed to obtain a test piece. The length L0 (mm) of the test piece in the non-extended state is measured, and the extension ratio of the measurement target portion is calculated by the following equation.
Elongation ratio of test piece = 50 mm (length in the longitudinal direction of test piece)/L0 mm

The ratio of the expansion ratio X1 in the vertical direction X of the expansion/contraction region 7T to the expansion ratio X2 in the vertical direction X of the other elastic member (the elastic member 61 for forming the leak-proof cuff, the elastic member for forming the absorbent body gathering) is the expansion ratio. Assuming that X1≦extension ratio X2, extension ratio X2/extension ratio X1 is preferably 1 or more, more preferably 1.2 or more, and preferably 2 or less, more preferably 1.8 or less.
The expansion ratio X1 of the stretchable region 7T in the longitudinal direction X is preferably 1.5 times or more, more preferably 1.8 times or more, and preferably 3.5 times or less, more preferably 3 times or less.

As shown in FIG. 2, the diaper 1 of the present embodiment has a waist-gather forming elastic member 13 as another elastic member extending in the lateral direction Y in a state capable of developing elasticity in the same direction. However, the elastic member 7 extending in the same direction as the elastic member 13 for elastically stretching in the longitudinal direction X is arranged so as not to intersect the elastic member 13 for forming the waist gathers. When the elastic member 7 and the waist-gather forming elastic member 13 intersect, the elastic region 7T in which the elastic member 7 is present is affected by the elastic member 13, and the above-described elastic region 7T and the low basis weight portion 52 cooperate with each other. There is a concern that the effect of improving the fit of the buttocks by the work may not be sufficiently exerted. In order to eliminate such a concern, it is preferable that the elastic member 7 does not intersect with another elastic member extending in the lateral direction Y in a state where the elastic member 7 can expand and contract.

In the diaper 1 of the present embodiment, as described above, the two elastic members 7 are arranged on the non-skin facing surface of the absorbent core 50 in the core wrap sheet 51 and cover the low basis weight part 52 (non-skin). The side core wrap sheet) is joined to the non-skin facing surface of the absorber 5, that is, the non-skin facing surface 5a. In this way, by introducing the elastic member 7 at a position closer to the wearer on the non-skin side than the absorber 5, the effect of improving the fit of the buttocks by the cooperation of the stretchable region 7T and the low basis weight part 52 described above can be obtained. It will be played more reliably.

In this way, when the elastic member 7 is joined to the non-skin side core wrap sheet (core wrap sheet 51), for example, the configurations shown in FIGS. 8 and 9 can be adopted.
In the form shown in FIG. 8, the elastic member fixing sheet material 9 is disposed between the two elastic members 7 and the back sheet 4 (the intermediate sheet), and the sheet material 9 is composed of the two elastic members 7. And the back sheet 4 is not joined. As the sheet material 9, a sheet that can be joined to the elastic member 7 is used, and for example, paper, non-woven fabric, or the like can be used.
In the form shown in FIG. 9, both

end portions

51S, 51S of the one core wrap sheet 51 along the longitudinal direction X are arranged so as to cover the non-skin facing surface of the absorbent core 50, and one end portion 51S. And the other end 51S are overlapped at the central portion in the lateral direction Y of the absorbent core 50, and two elastic portions are provided between the one end 51S and the other end 51S in the overlapped portion. The member 7 is interposed. The two elastic members 7 are joined to both ends 51S, 51S by joining means such as an adhesive.

The absorbent article of the present invention is not limited to the pants-type disposable diaper as in the above embodiment, and broadly includes articles used for absorbing body fluids discharged from the human body (urine, menstrual blood, loose stool, sweat, etc.), A deployment type disposable diaper equipped with a so-called fastening tape, a sanitary napkin, a sanitary shorts and the like are also included.

Although the present invention has been described above based on the embodiment, the present invention can be appropriately modified without being limited to the embodiment.
For example, in the diaper 1 of the above-described embodiment, the elastic region is provided in the member located on the side farther from the wearer's skin than the absorber 5, specifically, the back sheet 4, the exterior body 10 (outer layer sheet 11, inner layer sheet 12). May be provided.
Further, in the diaper 1 of the above-described embodiment, the exterior body 10 is continuously extended from the front side portion F to the rear side portion R, but instead of this, the exterior body 10 constitutes the front side portion F. The absorbent main body 2 may be fixed by bridging both members and the member forming the rear side portion R independently.
All the parts of the above-described one embodiment can be appropriately used mutually. Regarding the above-described embodiment of the present invention, the following supplementary notes are further disclosed.

<1>
The wearer has a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction, and the front side portion and the back of the wearer that are arranged on the wearer's abdominal side when worn with the center of the vertical direction as a boundary. An absorber containing an absorbent material, a top sheet arranged closer to the wearer's skin than the absorber, and a wearer more than the absorber. An absorbent article that is arranged on the side far from the skin and that includes an outermost layer sheet that forms an outer surface visible from the outside,
At a central portion in the lateral direction of the absorber disposing region that overlaps the absorber in a plan view and between the absorber and the outermost layer sheet, the elastic member is capable of exhibiting stretchability in the longitudinal direction. Extending in the longitudinal direction, the elastic member is present at least on the rear side,
At the central portion of the absorbent body in the lateral direction, a low basis weight portion having a smaller mass per unit area of the absorbent material than both lateral portions of the absorbent body extends in the longitudinal direction. ,
An absorbent article in which the stretchable region where the elastic member exists and the low basis weight part overlap with each other in a plan view.
<2>
The mass per unit area of the absorbent material of the low basis weight portion is 80% or less of the mass per unit area of the absorbent material present on both lateral sides of the low basis weight portion, The absorbent article according to 1>.
<3>
The absorbent according to <1>, wherein the absorbent body is configured to include an absorbent core containing the absorbent material, and the low basis weight portion is a through hole penetrating the absorbent core in a thickness direction. Sex goods.

<4>
The length in the vertical direction of the overlapping portion of the stretchable region and the low basis weight portion in a plan view is 10% or more, preferably 15% or more, of the entire length of the absorber in the vertical direction. The absorbent article according to any one of 1> to <3>.
<5>
The length in the vertical direction of the overlapping portion of the stretchable region and the low basis weight portion in a plan view is 50% or less, preferably 35% or less, of the entire length of the absorber in the vertical direction. The absorbent article according to any one of 1> to <4>.
<6>
The length of the low basis weight portion in the vertical direction is 10% or more, preferably 15% or more of the entire length of the absorbent body in the vertical direction, according to any one of <1> to <5>. Absorbent article.
<7>
The absorption according to any one of the above items <1> to <6>, wherein the length of the elastic region in the vertical direction is 10% or more, preferably 15% or more of the entire length of the absorbent body in the vertical direction. Sex goods.
<8>
Any one of <1> to <7>, wherein the horizontal length (width) of the low basis weight portion is equal to or longer than the horizontal length (width) of the stretchable region. The absorbent article according to.
<9>
The ratio of the lateral length (width) of the low basis weight portion to the lateral length (width) of the stretchable region is preferably 1 or more and 3 or less, more preferably 1.2 or more and 2 or less. The absorbent article according to any one of <1> to <8>.

<10>
There is an absorber non-bonding region in which the absorber and the outermost layer sheet are not directly or indirectly bonded, and in plan view, the absorber non-bonding region is an overlap between the stretchable region and the low basis weight part. Overlap with the department,
The absorbent article according to any one of <1> to <9>, wherein the elastic member of the overlapping portion that overlaps with the absorber non-bonding region in a plan view is non-bonding to the outermost layer sheet. ..
<11>
In the worn state, a portion of the absorber that overlaps with the absorber non-bonding region in plan view and also overlaps with the overlapping region of the stretchable region and the low basis weight part is separated from the outermost layer sheet by contraction of the elastic member. The absorbent article according to <10>, which can move in any direction.
<12>
The absorbent body non-bonding region is longer in the lateral direction than the elastic region and is continuous in the longitudinal direction over 50% or more, preferably 70% or more of the total length in the longitudinal direction of the elastic region, The absorbent article according to <10> or <11>.
<13>
The absorbent article according to any one of <10> to <12>, wherein the entire stretchable region overlaps with the absorber non-bonding region in a plan view.
<14>
The absorbent article according to any one of <10> to <13>, in which the lateral length (width) is long in the order of the absorber non-bonding region, the low basis weight portion, and the stretchable region.
<15>
The absorbent article according to any one of <10> to <14>, wherein the length in the longitudinal direction is long in the order of the absorber non-bonding region, the low basis weight portion, and the stretchable region.

<16>
The absorbent article according to any one of <1> to <15>, wherein the topsheet has a concavo-convex structure in which convex portions and concave portions are alternately arranged in the lateral direction.
<17>
The absorbent body is configured to include an absorbent core containing the absorbent material, and a non-skin side core wrap sheet which is disposed on a non-skin facing surface of the absorbent core and covers the low basis weight portion. ,
The absorbent article according to any one of <1> to <16>, wherein the non-skin side core wrap sheet is a non-woven fabric.
<18>
The non-stretchable regions having no stretchability in both the vertical direction and the horizontal direction are arranged on both lateral sides of the stretchable region in the absorber placement region, and the stretchable regions are not stretched. > The absorbent article according to any one of <1>.
<19>
The absorbent article according to <18>, wherein the non-stretchable region is present at a position separated from the stretchable region outside the lateral direction by 10 mm or more, preferably 15 mm or more.
<20>
An absorbent core containing the absorbent material, and is arranged on the non-skin facing surface of the absorbent core, comprising a non-skin side core wrap sheet covering the low basis weight portion,
The absorbent article according to any one of <1> to <19>, wherein the elastic member is joined to a non-skin facing surface of the non-skin side core wrap sheet.
<21>
The absorbent article according to any one of <1> to <20>, wherein the elastic member is a sheet-shaped or thread-shaped elastic member, preferably a thread-shaped elastic member.

<22>
<1> to <21, wherein another elastic member separate from the elastic member is arranged at or near the absorber placement region and at a stretch region overlapping position overlapping the stretch region in the vertical direction. > The absorbent article according to any one of <1>.
<23>
The absorbent article according to <22>, wherein the other elastic member is an elastic member for forming a leak-proof cuff or an elastic member for forming an absorbent gather.
<24>
<22> or <23>, wherein the vertical expansion ratio of the elastic region is the same as or smaller than the vertical expansion ratio of the other elastic member at the elastic region overlapping position. Absorbent article.
<25>
The ratio of the longitudinal expansion ratio of the other elastic member at the elastic region overlapping position to the longitudinal expansion ratio of the elastic region is 1 or more and 2 or less, preferably 1.2 or more and 1.8 or less. The absorbent article according to any one of <22> to <24>.
<26>
The expansion ratio in the longitudinal direction of the stretchable region is 1.5 times or more and 3.5 times or less, preferably 1.8 times or more and 3 times or less, and any one of the above items <22> to <25> Absorbent article.
<27>
The absorbent article according to any one of <1> to <26>, in which the elastic member is present only on the rear side portion.
<28>
The absorbent article according to any one of <1> to <27>, wherein the elastic member is present in a portion corresponding to a cleft of a wearer.

According to the present invention, there is provided an absorbent article which has excellent fit to the wearer's body and can effectively prevent diffusion of excrement such as loose stools to the back side or leakage from the back side.

Claims

The wearer has a vertical direction corresponding to the front-back direction of the wearer and a horizontal direction orthogonal to the vertical direction, and the front side portion and the back of the wearer that are arranged on the wearer's abdominal side when worn with the center of the vertical direction as a boundary. An absorber containing an absorbent material, a top sheet arranged closer to the wearer's skin than the absorber, and a wearer more than the absorber. An absorbent article that is arranged on the side far from the skin and that includes an outermost layer sheet that forms an outer surface visible from the outside,
At a central portion in the lateral direction of the absorber disposing region that overlaps the absorber in a plan view and between the absorber and the outermost layer sheet, the elastic member is capable of exhibiting stretchability in the longitudinal direction. Extending in the longitudinal direction, the elastic member is present at least on the rear side,
At the central portion of the absorbent body in the lateral direction, a low basis weight portion having a smaller mass per unit area of the absorbent material than both lateral portions of the absorbent body extends in the longitudinal direction. ,
An absorbent article in which the stretchable region where the elastic member exists and the low basis weight part overlap with each other in a plan view.
The mass per unit area of the absorbent material of the low basis weight part is 80% or less of the mass per unit area of the absorbent material present on both sides in the lateral direction of the low basis weight part. The absorbent article according to 1.
The absorbent article according to claim 1, wherein the absorbent body is configured to include an absorbent core containing the absorbent material, and the low basis weight portion is a through hole penetrating the absorbent core in a thickness direction. Goods.
4. The length in the vertical direction of the overlapping portion of the stretchable region and the low basis weight portion in plan view is 10% or more of the entire length of the absorber in the vertical direction. The absorbent article according to.
5. The length in the vertical direction of the overlapping portion of the stretchable region and the low basis weight portion in a plan view is 50% or less of the total length of the absorber in the vertical direction. The absorbent article according to.
The absorbent article according to any one of claims 1 to 5, wherein the length of the low basis weight portion in the vertical direction is 10% or more of the entire length of the absorber in the vertical direction.
The absorbent article according to any one of claims 1 to 6, wherein the length of the elastic region in the vertical direction is 10% or more of the total length of the absorbent body in the vertical direction.
The absorbent article according to any one of claims 1 to 7, wherein the lateral length of the low basis weight portion is equal to or longer than the lateral length of the stretchable region.
9. The absorbent article according to claim 1, wherein a ratio of the horizontal length of the low basis weight portion to the horizontal length of the stretchable region is 1 or more and 3 or less. ..
There is an absorber non-bonding region in which the absorber and the outermost layer sheet are not directly or indirectly bonded, and in plan view, the absorber non-bonding region is an overlap between the stretchable region and the low basis weight part. Overlap with the department,
The absorbent article according to any one of claims 1 to 9, wherein the elastic member of the overlapping portion that overlaps with the absorber non-bonding region in a plan view is non-bonding to the outermost layer sheet.
In the worn state, a portion of the absorber that overlaps with the absorber non-bonding region in plan view and also overlaps with the overlapping region of the stretchable region and the low basis weight part is separated from the outermost layer sheet by contraction of the elastic member. The absorbent article according to claim 10, which is movable in a direction.
12. The absorbent body non-bonding region is longer in the lateral direction than the elastic region and is continuous in the longitudinal direction over 50% or more of the total length of the elastic region in the longitudinal direction. Absorbent article.
The absorbent article according to any one of claims 10 to 12, wherein the entire stretchable region overlaps with the absorber non-bonding region in a plan view.
The absorbent article according to any one of claims 10 to 13, wherein the absorbent body non-bonding area, the low basis weight portion, and the stretchable area have a longer length in the lateral direction.
The absorbent article according to any one of claims 10 to 14, wherein the absorbent body non-bonding area, the low basis weight portion, and the stretchable area have a longer length in the longitudinal direction.
The absorbent article according to any one of claims 1 to 15, wherein the surface sheet has a concavo-convex structure in which convex portions and concave portions are alternately arranged in the lateral direction.
The absorbent body is configured to include an absorbent core containing the absorbent material, and a non-skin side core wrap sheet which is disposed on a non-skin facing surface of the absorbent core and covers the low basis weight portion. ,
The absorbent article according to any one of claims 1 to 16, wherein the non-skin side core wrap sheet is a non-woven fabric.
18. The non-stretchable region having no stretchability in both the vertical direction and the horizontal direction is arranged on both outer sides of the stretchable region in the absorber placement region in the horizontal direction. The absorbent article according to item 1.
The absorbent article according to claim 18, wherein the non-stretchable region is present at a position separated from the stretchable region to the outside in the lateral direction by 10 mm or more.
An absorbent core containing the absorbent material, and is arranged on the non-skin facing surface of the absorbent core, comprising a non-skin side core wrap sheet covering the low basis weight portion,
The absorbent article according to any one of claims 1 to 19, wherein the elastic member is joined to a non-skin facing surface of the non-skin side core wrap sheet.
The absorbent article according to any one of claims 1 to 20, wherein the elastic member is a sheet-shaped or thread-shaped elastic member.
22. Another elastic member, which is separate from the elastic member, is arranged at the elastic member arrangement region or in the vicinity thereof and at an elastic region overlapping position overlapping the elastic region in the longitudinal direction. The absorbent article according to item 1.
The absorbent article according to claim 22, wherein the other elastic member is an elastic member for forming a leak-proof cuff or an elastic member for forming absorbent gathers.
The absorbency according to claim 22 or 23, wherein the expansion ratio in the vertical direction of the elastic region is the same as or smaller than the expansion ratio in the vertical direction of the other elastic member at the elastic region overlapping position. Goods.
25. The ratio of the vertical expansion ratio of the other elastic member at the elastic region overlapping position to the vertical expansion ratio of the elastic region is 1 or more and 2 or less. The absorbent article according to paragraph.
The absorbent article according to any one of claims 1 to 25, wherein a stretch ratio in the longitudinal direction of the stretchable region is 1.5 times or more and 3.5 times or less.
The absorbent article according to any one of claims 1 to 26, wherein the elastic member is present only on the rear side portion.
The absorbent article according to any one of claims 1 to 27, wherein the elastic member is present in a portion corresponding to a gluteal cleft of a wearer.