CN216823895U - Absorbent article - Google Patents

Abstract

The utility model provides an absorptive article. In the absorptive article, an elastic member (7) extends in the longitudinal direction (X) between the absorptive body (5) and the outermost sheet (10) at the center portion in the lateral direction (Y) of the absorptive body placement region (5T) in a state where stretchability is exhibited, and the elastic member (7) is present at least in the rear side portion (R). In the center portion in the transverse direction (Y) of the absorbent body (5), a low grammage portion (52) having a smaller mass per unit area of the absorbent material than both side portions in the transverse direction (Y) extends in the longitudinal direction (X). In a plan view, the expansion/contraction region (7T) of the elastic member (7) overlaps the low grammage part (52).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a disposable diaper.

Background

A disposable diaper, which is one type of absorbent article, typically includes: absorbent material containing absorbent material such as hydrophilic fiber or water-absorbent polymer: a topsheet disposed closer to the skin of the wearer than the absorbent body: and a back sheet disposed on a side farther from the skin of the wearer than the absorbent body. A disposable diaper having such a structure is required to fit the body of a wearer with good adhesion and to have excellent leakage prevention of excrement such as urine and feces.

Patent document 1 describes, as a disposable diaper that can improve the tactile sensation of the sheet contacting the skin of the wearer and can give a softer impression to a wearing assistant such as a mother: a low grammage portion formed of a notch is formed in an absorber, an auxiliary sheet is arranged between a front sheet and the absorber, a crotch stretch portion is arranged between the absorber and a back sheet in a crotch region, and the crotch stretch portion is formed so as to overlap the low grammage portion, the absorber, and the auxiliary sheet in a plan view. The low grammage portion extends in the lateral direction on both side portions of the absorbent body in the longitudinal direction. The crotch stretch unit is formed of a stretchable sheet or a plurality of linear or belt-like elastic members. The longitudinal direction herein means a direction of the absorbent article corresponding to the front-back direction of the wearer, and the lateral direction means a direction perpendicular to the longitudinal direction. According to the disposable diaper described in patent document 1, the crotch stretch unit can be more flexibly deformed in the region where the crotch stretch unit is disposed, and the contraction of the leg stretch units can be absorbed, and the occurrence of wrinkles in unintended portions can be suppressed.

Patent document 2 describes a pants-type absorbent article that can provide an underwear-like appearance and suppress leakage of excreta such as menstrual blood, in which a stretchable section that stretches and contracts in the longitudinal direction is disposed in the lateral center portion of the absorbent main body on the rear side in the longitudinal direction and at a position closer to the non-skin side of the wearer than the absorbent body. Patent document 2 describes, as a specific example of the stretchable section, a portion in which 4 hip elastic members 41 exhibiting stretchability are provided in an absorbent main body.

Patent document 3 describes, as an improvement technique of a pants-type disposable diaper including pants and a liquid-absorbent pad positioned on an inner surface of the pants, a structure in which an elastic member extending in a longitudinal direction is disposed in an extended state on an outer surface of a back sheet constituting the pad, and the pad is lifted from the inner surface of the pants toward the skin of a wearer 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 skin of the wearer, and even if the pants slip down, the close contact state of the pad can be maintained.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-7515

Patent document 2: japanese patent laid-open publication No. 2018-267

Patent document 3: japanese patent laid-open publication No. 2003-62009

Disclosure of Invention

The utility model provides an absorbent article, it has the vertical and horizontal with this vertical quadrature that corresponds with the fore-and-aft direction of wearer to this vertical central authorities divide as the boundary and dispose in the front side portion of the ventral side of wearer and dispose in the dorsal back side portion of wearer when dressing, this absorbent article includes: an absorbent body containing an absorbent material; a topsheet disposed closer to the skin of the wearer than the absorbent member; and an outermost sheet disposed on a side of the absorbent body remote from the skin of the wearer and forming an outer surface visible from the outside. An elastic member extending in the longitudinal direction in a state in which stretchability is exhibited in the longitudinal direction between the absorbent body and the outermost sheet in the widthwise central portion of the absorbent body disposition region overlapping with the absorbent body in plan view, the elastic member being present at least in the rear side portion. In the widthwise central portion of the absorbent body, a low grammage portion having a smaller mass per unit area of the absorbent material than both side portions of the absorbent body in the widthwise direction extends in the longitudinal direction, and in a plan view, there is a stretchable region of the elastic member overlapping with the low grammage portion.

Drawings

Fig. 1 is a perspective view schematically showing a natural state of a pants-type disposable diaper as an embodiment of an absorbent article of the present invention.

Fig. 2 is a developed plan view schematically showing a skin-facing surface side (inner surface side) in a developed and stretched state of the diaper shown in fig. 1.

Fig. 3 is a cross-sectional view schematically showing a section I-I of fig. 2.

Fig. 4 is an enlarged cross-sectional view showing a main portion of fig. 3 enlarged and simplified.

Fig. 5 is a view schematically showing the appearance of the main part shown in fig. 4, showing the worn state of the diaper 1 shown in fig. 1.

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 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

One of the technical problems of absorbent articles such as disposable diapers is to improve the absorption performance of soft feces. Soft feces are excrement which is particularly common in children of low-age, and have high viscosity and high fluidity. Therefore, loose stool is not easily absorbed by the absorbent body inside the diaper, and loose stool excreted into the crotch portion of the diaper may spread to the back side along the front sheet and leak to the outside. When loose stool spreads from the crotch portion to the back side, there is a possibility that the inner surface of the back side of the diaper is contaminated with loose stool even if the loose stool is not exposed to the outside of the diaper, and therefore, there is a problem that the diaper changing operation becomes complicated, which causes a burden on the wearer and causes a problem in the skin of the wearer.

As technical means for improving the absorption performance of loose stools, there have been conventionally studied means for providing a concave-convex structure in which loose stools are less likely to spread on a front sheet, introducing a member capable of absorbing loose stools, which is different from an absorbent body, into a crotch part, providing a pocket structure, and securing a space capable of accommodating loose stools.

The present invention relates to an absorbent article which has excellent fit to the body of a wearer and can effectively prevent excrement such as loose stool from spreading to the back side or leaking from the back side.

The present invention will be described below based on preferred embodiments with reference to the accompanying drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic drawings, and the proportions of the respective dimensions and the like may differ from the actual proportions.

Fig. 1 to 3 show a pants-type disposable diaper 1 as an 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, i.e., the direction extending from the abdomen side to the back side via the crotch portion, and a transverse direction Y orthogonal thereto, and includes: an absorbent body 5 which is divided into a front side portion F disposed on the abdominal side of the wearer and a rear side portion R disposed on the back side of the wearer when worn, with a longitudinal center (longitudinal centerline CLx) as a boundary, and which contains an absorbent material; a topsheet 3 disposed closer to the skin of the wearer than the absorbent body 5; and an outer casing 10 (outermost sheet) disposed on a side of the absorbent body 5 remote from the skin of the wearer and forming an outer surface of the diaper 1 visible from the outside.

The diaper 1 is a so-called pants-type disposable diaper including: an absorbent main body 2 including an absorbent body 5; and an exterior body 10 disposed on the non-skin side which is the side farther from the skin of the wearer than the absorbent main body 2, wherein both side edge portions of the exterior body 10 in the front side portion F and the exterior body 10 in 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, ultrasonic sealing, and the like, and as shown in fig. 1, a pair of side seals S, S, a waist opening WH through which the trunk of the wearer passes, and a pair of leg openings LH, LH through which the lower limbs of the wearer pass are formed.

As shown in fig. 2, the diaper 1 has a front side portion a disposed on the front side of the wearer when worn, a back side portion C disposed on the back side, and a crotch portion B therebetween in the longitudinal direction X. The front portion a is a part of the front portion F, the back portion C is a part of the back portion R, and the crotch portion B extends in the longitudinal direction X over a longitudinal center line CLx located at a boundary between the front portion F and the back portion R. The crotch portion B includes a excretion portion facing portion (not shown) that faces an excretion portion (such as a penis or anus) of a wearer when the diaper 1 is worn. The longitudinal centerline CLx is an imaginary straight line that bisects the diaper 1 in the longitudinal direction X and extends in the transverse direction Y in an unfolded and elongated state as shown in fig. 2. The "developed and extended state" of the diaper 1 means a state in which the diaper 1 is developed by separating the side seals S, and the elastic members of the respective portions are extended and extended to a designed size (the same size as a size when the diaper 1 is developed in a flat shape while completely excluding the influence of the elastic members) with respect to the developed diaper 1.

As shown in fig. 2, the absorbent main body 2 is formed in a rectangular shape in plan view in the unfolded and extended state of the diaper 1, extends in the longitudinal direction X from the front side portion F to the rear side portion R so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1 in the unfolded and extended state, is disposed in the central portion in the lateral direction Y of the outer package 10, and is joined to the outer package 10 with an adhesive.

As shown in fig. 2 and 3, the absorbent main body 2 includes: a liquid-permeable topsheet 3 forming a skin-facing surface; a back sheet 4 having liquid impermeability, or water repellency, which is formed on the non-skin-facing surface; and a liquid-retentive absorbent body 5 disposed between the two sheets 3 and 4, and integrally formed by a known joining means such as an adhesive.

In the present specification, the "skin-facing surface" is a surface facing the skin side of the wearer when the absorbent article is worn, i.e., a surface relatively close to the skin side of the wearer, among the absorbent article or its constituent members (e.g., absorbent body), and the "non-skin-facing surface" is a surface facing the side opposite to the skin side when the absorbent article is worn, i.e., a surface relatively far from the skin of the wearer, among the absorbent article or its constituent members. The term "worn" as used herein refers to a state in which a normal proper wearing position, that is, a proper wearing position of the absorbent article is maintained.

The front sheet 3, the back sheet 4, and the absorbent body 5 are not particularly limited and can be those conventionally used in such absorbent articles. As the front sheet 3, various nonwoven fabrics and apertured films can be used, for example. As the back sheet 4, for example, a resin film, a laminate of a resin film and a nonwoven fabric can be used. When the absorbent body 5 contains an absorbent material, the absorbent material used as the material of the absorbent body in such an absorbent article can be used without particular limitation, and examples thereof include wood pulp, synthetic fibers after hydrophilization treatment, and water-absorbent polymers. The form of the absorbent body 5 is not particularly limited as long as it contains an absorbent material, and may be, for example, a stacked body formed by stacking absorbent materials or a sheet-like absorbent structure containing an absorbent material.

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

The core-spun sheet 51 may be constituted by 1 sheet or a plurality of sheets. The core-wrapped sheet 51 made of 1 sheet, for example, has a width 2 times or more and 3 times or less the length in the transverse direction Y of the absorbent core 50, covers the entire region of the skin-facing surface of the absorbent core 50, extends outward in the transverse direction Y from both side edges of the absorbent core 50 in the longitudinal direction X, and is wound around the non-skin-facing surface side of the absorbent core 50 at the extended portion, so that the entire region of the non-skin-facing surface of the absorbent core 50 can be covered. In the core sheet 51 constituted by 1 sheet as described above, a portion covering the skin-facing surface of the absorbent core 50 is a skin-side core sheet, and a portion covering the non-skin-facing surface of the absorbent core 50 is a non-skin-side core sheet. The non-skin-side wrapping sheet is disposed on the non-skin-facing surface of the absorbent core 50 and covers a low grammage portion 52 described later. The core-clad sheet 51 made of a plurality of sheets includes, for example: 1 skin-side wrapping sheet covering the skin-facing surface of the absorbent core 50; and 1 non-skin-side wrapping sheet which is separate from the skin-side wrapping sheet and covers the non-skin-facing surface of the absorbent core 50.

As shown in fig. 2 and 3, a pair of leakage preventing cuffs 6 and 6 including a liquid-resistant, water-repellent, and air-permeable leakage preventing cuff forming sheet 60 are provided on both side portions of the skin-facing surface of the absorbent main body 2 in the longitudinal direction X. Each of the pair of leakage preventive 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 sheet 12 in the illustrated embodiment) to form a fixed end portion, and has the other end side in the lateral direction Y formed as a free end portion not fixed to the other component, and at the free end portion, a linear or belt-shaped leakage preventive cuff forming elastic member 61 is disposed in an extended state in the longitudinal direction X. In the illustrated embodiment, the number of the elastic members 61 arranged in each of the leak-proof cuffs 6 is 1, but a plurality of the elastic members may be provided. When the elastic member 61 disposed in the stretched state contracts during wearing of the diaper 1, the leakage preventive cuff 6 stands up at least in the crotch portion B, thereby preventing excrement such as loose feces from flowing out in the lateral direction Y.

As shown in fig. 2, the outer package 10 forms the outer shape of the diaper 1 in an unfolded and stretched state, and the peripheral edge of the outer package 10 forms the contour lines of the diaper 1 in this state, that is, the contour lines of the front side portion a, the crotch portion B, and the back side portion C. 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 length in the longitudinal direction X in the front side portion a and the back side portion C, and the pair of leg edge portions LS, which are both side edge portions of the exterior body 10 along the longitudinal direction X in the crotch portion B, are curved in an arc shape protruding toward the center in the lateral direction Y, and as shown in fig. 2, an hourglass shape is formed in which the central region in the longitudinal direction X is narrowed inward in the lateral direction Y in a plan view.

As shown in fig. 3, the outer package 10 of the present embodiment includes a laminate of an outer sheet 11 and an inner sheet 12, including the sheets 11 and 12, in the order from the proximal side to the distal side of the absorbent body 5. In the worn state of the diaper 1, the outer sheet 11 is positioned on the side farther from the body of the wearer to form the outer surface of the diaper 1, i.e., the non-skin-facing surface, and the inner sheet 12 is positioned on the side closer to the body of the wearer to form the inner surface of the diaper 1, i.e., the skin-facing surface. The outer layer sheet 11 and the inner layer sheet 12 are joined and integrated at predetermined portions by joining means such as an adhesive. More specifically, the outer sheet 11 is a member forming the outer surface of the diaper 1 visible from the outside with respect to the outer package 10.

The outer layer sheet 11 of the present embodiment has a length in the longitudinal direction X longer than the inner layer sheet 12, and has a portion extending from an end edge in the longitudinal direction X of the inner layer sheet 12, 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 in the longitudinal direction X of the absorbent main body 2. The sheets 11 and 12 constituting the exterior body 10 may be the same type of sheet or may be different types of sheets. The sheets 11 and 12 typically do not have stretchability, but may have stretchability within a range that does not hinder the predetermined effects of the present invention. Examples of the non-stretchable sheet having no stretchability, which can be used as the sheets 11 and 12, include nonwoven fabrics produced by various production methods, specifically, spun bond nonwoven fabrics, hot air nonwoven fabrics, and needle punched nonwoven fabrics.

The term "stretchability" as used herein means a property of being stretchable in a predetermined direction and contracting when the stretching is released. A sheet having substantially no stretchability (being non-stretchable) in a certain direction means that the sheet hardly stretches even if a tensile force is applied to the sheet in the certain direction. For example, when a sample having a length of 15 × a width of 5cm is stretched in the longitudinal direction by a material tensile tester such as TENSILON and the elongation at break of the sample is 10% or less, the sample has substantially no stretchability in the longitudinal direction. The elongation at break can be calculated by (the length of the sample at break-the original length of the sample)/(the original length of the sample) × 100.

As shown in fig. 1 and 2, in the diaper 1 of the present embodiment, a plurality of linear or belt-like elastic members 13 for forming waist gathers are arranged in the front side portion a and the back side portion C in an extended state in the lateral direction Y, and these plurality of elastic members 13 are arranged at predetermined intervals in the longitudinal direction X. As described above, the elastic member 13 is disposed in a state where its stretchability is exhibited, and thereby, substantially continuous annular waistline gathers are formed over the entire circumference of the abdomen-side portion a and the back-side portion C, which are the disposed portions. Further, in some cases, the outer package 10 in the front side portion a and the back side portion C has a non-stretchable region which hinders the stretchability of the elastic member 13 in a region overlapping the absorbent main body 2 in a plan view, and even in such a case, the elastic member 13 which is fixed in a stretched state in the lateral direction Y is provided as the whole of the front side portion a and the back side portion C, and therefore, the outer package has stretchability in the lateral direction Y. In addition, by arranging 1 or more linear or belt-like leg gather forming elastic members 14 in an extended state at the leg edge LS at which the opening edge portions of the pair of leg openings LH, LH are formed, respectively, a substantially continuous annular leg gather is formed over the entire circumference at the opening edge portions of the pair of leg openings LH, LH. These elastic members 13 and 14 for wrinkle formation are sandwiched and fixed between the outer layer sheet 11 and the inner layer sheet 12 constituting the exterior body 10 by joining means such as an adhesive.

As one of the main features of the diaper 1, as shown in fig. 2 to 4, in a region (absorbent body disposition region 5T) overlapping with the absorbent body 5 in a plan view of the rear side portion R (a projection view of the absorbent body 5 in the thickness direction), the elastic member 7 may extend in the longitudinal direction X in a state where stretchability is exhibited in the direction, and the low grammage portion 52 may extend in the longitudinal direction X in the central portion in the lateral direction Y of the absorbent body 5. Hereinafter, the characteristic portions of the diaper 1 will be described in detail.

As shown in fig. 2, in the diaper 1, the elastic member 7 extends in the longitudinal direction X in the central portion in the lateral direction Y of the absorbent body disposition region 5T and between the absorbent body 5 and the outer package 10 (outermost layer sheet) in such a state that stretchability is exhibited in the longitudinal direction X.

In the present embodiment, 2 linear elastic members 7 are disposed at intervals in the lateral direction Y in the central portion in the lateral direction Y of the absorber disposition region 5T. The 2 elastic members 7 are arranged symmetrically with respect to the center (transverse center line CLy) in the transverse direction Y of the absorbent body 5 (diaper 1). The transverse centerline CLy is an imaginary straight line that bisects the diaper 1 in the transverse direction Y and extends in the longitudinal direction X in an unfolded and extended state as shown in fig. 2.

In the present embodiment, as shown in fig. 3, each of the 2 elastic members 7 is disposed in a portion of the core sheet 51 covering the non-skin-facing surface of the absorbent core 50, that is, the non-skin-facing surface of the absorbent core 50, and is joined to the non-skin-facing surface of the non-skin-side core sheet (the non-skin-facing surface 5a of the absorbent body 5) covering the low grammage portion 52 in a state of being stretched in the longitudinal direction X, whereby the elastic members 7 extend in the longitudinal direction X in a state of being capable of exhibiting stretchability in the longitudinal direction X. The joining means of the elastic member 7 and the core-spun sheet 51 is not particularly limited, and known joining means such as a hot-melt adhesive can be used.

The form of the elastic member 7 is not limited to a linear form, and various forms can be adopted within a range that achieves the predetermined effect of the present invention, and for example, the form may be a belt form, a sheet form, or the like. The sheet-like elastic member is a so-called elastic sheet, and may be, for example, a lattice (net) or a film. The arrangement of the elastic member 7 is not particularly limited, and as shown in the present embodiment, not only a plurality of linear or belt-shaped elastic members may be arranged at intervals in the lateral direction Y, but also, for example, 1 sheet-shaped elastic member (elastic sheet) having a predetermined area (for example, the same area as the area of the non-skin-facing surface side of the low grammage portion 52 described later) may be arranged, or both of the linear elastic member and the sheet-shaped elastic member may be arranged. However, the elastic member 7 is preferably formed of a linear elastic member from the viewpoint of the amount of contraction.

The elastic member 7 needs to be present at least in the rear side portion R in consideration of the later-described operational effects based thereon. In the present embodiment, as shown in fig. 2, 2 elastic members 7 are present in 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 may extend in the longitudinal direction X across the boundary (the longitudinal centerline CLx) between the front side portion F and the back side portion R, and the elastic member 7 may be present in both the front side portion F and the back side portion R.

In the diaper 1, as described above, the elastic member 7 extends in the longitudinal direction X in the absorbent body disposition region 5T in the rear side portion R and between the absorbent body 5 and the outer package 10 (outermost sheet), and the low grammage portion 52, in which "the mass per unit area of the absorbent material" (so-called basis weight or grammage) is smaller than both side portions in the lateral direction Y, extends in the longitudinal direction X in the central portion in the lateral direction Y of the absorbent body 5.

The absorbent body 5 of the present embodiment includes an absorbent core 50 containing an absorbent material, and the low grammage part 52 is formed in the absorbent core 50. The low grammage part 52 is a part of the absorbent body 5 (absorbent core 50) having a grammage less than that of both side parts of the low grammage part 52 in the lateral direction Y, and the "low grammage" includes: 1) a form in which the absorbent material is not present in the low grammage portion 52 (i.e., a form in which the grammage of the absorbent material is zero); 2) the low grammage portion 52 is in the form of an absorbent material. The low grammage portion 52 of the present embodiment is a through hole penetrating the absorbent core 50 in the thickness direction in the form of 1) described above as shown in fig. 3. The low grammage portion 52 as a through hole is formed in a rectangular shape in a plan view as shown in fig. 2, and the longitudinal direction thereof coincides with the longitudinal direction X.

In the low grammage portion 52 of the form of 2) above, there is a smaller amount of absorbent material than both side portions in the lateral direction Y of the low grammage portion 52 in the absorbent body 5. Typically, the mass per unit area of the absorbent material present in the low grammage portion 52 is 80 mass% or less with respect to the mass per unit area of the absorbent material present in both side portions in the lateral direction Y of the low grammage portion 52. The density of the absorbent material is lower in the low grammage portion 52 of the form of 2) than in both side portions thereof in the transverse direction Y, and the thickness is not limited to the case where the former is smaller than the latter, the former may be equal to the latter, or the former may be larger than the latter.

The method of forming the low grammage portion 52 is not particularly limited. As an example of a method of forming the low grammage portion 52, a method of intentionally inhibiting the stacking of the absorbent material in the portion to be formed of the low grammage portion 52 in the stacking step of the absorbent material such as wood pulp at the time of manufacturing the absorbent core 50 can be given. The method of forming the low grammage portion 52 can be performed in a method of manufacturing an absorbent core known in the art, for example, a method of manufacturing the absorbent core 50 by sucking a core forming material supplied with an air flow to a forming die formed on the outer peripheral surface of a rotary drum and depositing the core forming material, and can be performed by using a forming die having a predetermined pattern as the forming die, for example, a forming die in which a portion corresponding to the low grammage portion 52 protrudes upward from the peripheral portion. As another example of a method of forming the low grammage part 52, a method of manufacturing the absorbent core 50 without the low grammage part 52 and performing post-processing such as die cutting or cutting on a predetermined portion of the absorbent core 50 to form the low grammage part 52 may be mentioned.

The diaper 1 is characterized in that, in a plan view (a projection view of the absorbent body 5 in the thickness direction), the stretchable region 7T of the elastic member 7 overlaps the low grammage part 52, that is, the stretchable region 7T overlaps the low grammage part 52 in the thickness direction of the absorbent body 5. In the present embodiment, a hatched portion in fig. 2 is an expansion/contraction region 7T. The stretchable region 7T is generally stretchable in the longitudinal direction X, similarly to the elastic member 7 disposed therein.

As shown in fig. 2, in a plan view of the diaper 1, the stretchable region 7T is a region where an elastic member 7, that is, an "elastic member disposed in the center portion in the lateral direction Y of the absorbent body disposition region 5T and extending in the longitudinal direction X between the absorbent body 5 and the outermost sheet (in the present embodiment, the outer covering 10)" is present, and the "elastic member 7" herein means an elastic member 7 capable of exhibiting stretchability, that is, an "elastic member 7 fixed in an extended state in the longitudinal direction X". For example, as typical fixing methods of the elastic member 7, there are the following methods: the longitudinal both end portions of the elastic member 7d are not fixed to another member (for example, the core piece 51) or are not fixed in an extended state even if fixed, and the portions of the elastic member 7 sandwiched by the longitudinal both end portions (hereinafter referred to as "longitudinal center portion") are fixed in an extended state to another member. In such a fixing form of the elastic member 7, since the portion capable of exhibiting stretchability in the elastic member 7 is only the longitudinal direction central portion, a portion overlapping the longitudinal direction central portion of the elastic member 7 in a plan view is a stretchable region 7T. That is, when the stretchability cannot be exhibited at a part of the elastic member 7 (for example, at both longitudinal end portions), a portion overlapping a remaining portion (for example, at a longitudinal center portion) from which the part is removed from the elastic member 7 in a plan view is a stretchable region 7T.

In addition, as shown in the present embodiment, when the plurality of elastic members 7 are arranged at intervals in the lateral direction Y, in a plan view of the plurality of elastic members 7, a portion capable of exhibiting stretchability is an extensible region 7T in a region sandwiched between the outer edge of the elastic member 7 located at the outermost side in the lateral direction Y and the outer edge of the elastic member 7 located at the outermost side in the other lateral direction Y. The "outer edge of the elastic member 7" referred to herein means one of both side edges of the elastic member 7 in the longitudinal direction X, which is relatively distant from the center (transverse center line CLy) of the absorbent body 5 in the transverse direction Y. For example, in the present embodiment, as shown in fig. 2, 2 elastic members 7 are arranged at intervals in the lateral direction Y, and since each of the 2 elastic members 7 is in a state in which stretchability can be exhibited over the entire length in the longitudinal direction, a portion overlapping with the 2 elastic members 7 and a portion sandwiched between the 2 elastic members 7 (a portion indicated by oblique lines in fig. 2) in a plan view are stretchable regions 7T. If the two longitudinal ends of each of the 2 elastic members 7 cannot exhibit stretchability, the portions other than the two longitudinal ends of each of the 2 elastic members 7 and the portions sandwiched therebetween in plan view are stretchable regions 7T.

In the diaper 1, as described above, i) the elastic member 7 extends in the longitudinal direction X in a state where stretchability is exhibited in the longitudinal direction X at least on the side farther from the skin of the wearer than the absorbent body 5 in the absorbent body disposition region 5T of the rear side portion R, ii) the low grammage portion 52 extends in the longitudinal direction X in the central portion in the lateral direction Y of the absorbent body 5, and iii) the stretchable region 7T of the elastic member 7 overlaps with the low grammage portion 52 in a plan view (a projection view in the thickness direction of the absorbent body 5), and according to the configuration of the above i) to iii), the diaper 1 is excellent in the fit to the body of the wearer, particularly the fit to the groove portions (cleft buttocks) of the buttocks of the wearer, and can effectively prevent the diffusion of excrement such as loose stool to the back side and the leakage from the back side. That is, the central portion in the lateral direction Y of the absorbent body disposition region 5T of the rear side portion R where the elastic member 7 is located is a portion of the diaper 1 corresponding to the gluteal cleft of the wearer, and in the gluteal cleft corresponding portion, there is a stretchable region 7T in which the elastic member 7 disposed on the non-skin side of the absorbent body 5 extends in the longitudinal direction X in an extended state, whereby the portion of the absorbent body 5 overlapping the stretchable region 7T in plan view can be deformed so as to follow the gluteal cleft of the wearer by contraction of the elastic member 7 at the time of wearing the diaper 1, 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 high rigidity and a relatively large grammage to ensure necessary absorption performance, there is a fear that deformation does not occur by the contraction degree of the elastic member 7. In this regard, in the diaper 1, since the low grammage portion 52 is provided in the absorbent body 5 and the low grammage portion 52 is configured to overlap the stretchable region 7T in a plan view, it is possible to eliminate the fear that the diaper 1 is in good close contact with the hip of the wearer around the overlapping portion of the low grammage portion 52 and the stretchable region 7T when the diaper 1 is worn, and the excrement can be effectively prevented from spreading to the back side and leaking from the back side.

In particular, in the present embodiment, since the low grammage portion 52 is a through hole and no absorbent material is substantially present in the low grammage portion 52, the absorbent body 5 is likely to bend from the low grammage portion 52 (through hole) when the diaper 1 is worn, and the absorbent body 5 is likely to deform so as to follow the hip cleft of the wearer, so that the above-described operational effects can be more reliably achieved.

The low grammage portion 52 may be disposed at a position that can overlap at least a part of the expansion/contraction region 7T in plan view. As described above, since the elastic members 7 of the stretchable region 7T are arranged at least in the center portion in the lateral direction Y of the absorber arrangement region 5T in the rear portion R, the low grammage portion 52 is also arranged at least at the same position as the elastic members 7.

From the viewpoint of more reliably achieving the above-described operation and effect, the longitudinal length L1 (see fig. 2) of the overlapping portion between the stretchable region 7T and the low grammage portion 52 in plan view is preferably 10% or more, and more preferably 15% or more, with respect to the entire length in the longitudinal direction X of the absorbent body 5. On the other hand, if the longitudinal length L1 of the portion where the stretchable region 7T and the low grammage portion 52 overlap is too long, there is a possibility that the absorption performance is deteriorated and a trouble such as discomfort when the diaper 1 is worn occurs, and the upper limit of the longitudinal length L1 is preferably 50% or less, more preferably 35% or less, with respect to the entire length in the longitudinal direction X of the absorbent body 5.

In addition, in the case where the above-described "total length in the longitudinal direction X of the absorbent body 5" is constituted by a plurality of members (the absorbent core 50, the core-spun sheet 51) and the total lengths in the longitudinal direction X of the respective members are different as in the present embodiment, the total length in the longitudinal direction X of the member having the longest total length in the longitudinal direction X among the constituent members of the absorbent body 5 is "total length in the longitudinal direction of the absorbent body 5" unless otherwise specified. For example, in the case where the core-wrapped sheet 51 extends from the front and rear ends in the longitudinal direction X of the absorbent core 50, the entire length in the longitudinal direction X of the core-wrapped sheet 51 (the length from one end to the other end in the longitudinal direction X) is the entire length in the longitudinal direction X of the absorbent body 5.

From the viewpoint of more reliably achieving the above-described operation and effect, it is preferable that the overlapping portion between the stretchable region 7T and the low grammage portion 52 be formed continuously in the longitudinal direction X over 50% or more, particularly preferably 70% or more, of the total length of the one of the stretchable region 7T and the low grammage portion that is relatively short in the longitudinal direction X in plan view. In the embodiment shown in fig. 2, the low grammage portion 52 is longer than the stretchable region 7T in the longitudinal direction X, and the stretchable region 7T overlaps the low grammage portion 52 entirely in the longitudinal direction X in a plan view, and the low grammage portion 52 extends outward in the longitudinal direction X from the front end (the end on the front side portion F side) of the longitudinal direction X in the overlapping portion with the stretchable region 7T. Therefore, in the embodiment shown in fig. 2, the overlapping portion between the stretchable region 7T and the low grammage portion 52 is continuously formed over 100% of the entire length in the longitudinal direction X of the stretchable region 7T, which is one of the two regions that is relatively short in the entire length in the longitudinal direction X, and the longitudinal length L1 (see fig. 2) of the overlapping portion is the same as the entire length in the longitudinal direction X of the stretchable region 7T.

In addition, in the present invention, the lengths of the low grammage portion 52 and the vertical direction X of the expansion region 7T may be the same or different, and when the lengths of the vertical direction X are different from each other, either one may be long. The length of the low grammage portion 52 in the longitudinal direction X is preferably 10% or more, and more preferably 15% or more, relative to the entire length of the absorbent body 5 in the longitudinal direction X. The length of the stretch region 7T in the longitudinal direction X is preferably 10% or more, and more preferably 15% or more, relative to the entire length of the absorbent body 5 in the longitudinal direction X.

The length of the low grammage portion 52 in the transverse direction Y, i.e., the width W1 (see fig. 4), is preferably 1% or more, more preferably 3% or more, and preferably 40% or less, more preferably 20% or less, with respect to the length (width) of the absorbent body 5 in the transverse direction Y. The "width of the absorbent body" as used herein means the maximum width when the width of the absorbent body is not a constant value, and means the width (maximum width) of the absorbent core when the absorbent body includes the absorbent core, as in the present embodiment. The width W1 of the low grammage portion 52 in the transverse direction Y is preferably 1mm or more, more preferably 5mm or more, and preferably 50mm or less, more preferably 30mm or less.

The width W2 (see fig. 4) that is the length in the transverse direction Y of the stretchable region 7T may be the same as or different from the width W1 of the low grammage portion 52, and in the case where the widths are different from each other, either may be long, and from the viewpoint of promoting bending (see fig. 5) starting from the low grammage portion 52 of the absorbent body 5 when the diaper 1 is worn and further reliably preventing the diffusion of excrement such as loose feces into the back side and the leakage from the back side, the width W1 of the low grammage portion 52 is preferably equal to the width W2 of the stretchable region 7T or longer than the width W2 of the stretchable region 7T. When the ratio of the width W1 of the low grammage portion 52 to the width W2 of the stretchable region 7T is expressed as width W1/width W2, it is preferably 1 or more, more preferably 1.2 or more, and preferably 3 or less, more preferably 2 or less.

For example, as shown in the present embodiment, when the 2 linear elastic members 7 are arranged at intervals in the lateral direction Y, the width W2 of the stretchable region 7T is preferably 5mm or more and 50mm or less, more preferably 5mm or more and 30mm or less, from the viewpoint of promoting deformation of the portion overlapping the stretchable region 7T in the plan view of the absorbent body 5 so as to follow the cleft of the wearer of the diaper 1.

In addition, as shown in the present embodiment, when 2 linear elastic members 7 are arranged at intervals in the lateral direction Y, the pitch P1 (see fig. 4) between the adjacent elastic members 7 in the lateral direction Y (the distance between the central portions of the adjacent elastic members 7) is preferably 1mm or more, more preferably 3mm or more, and preferably 50mm or less, more preferably 30mm or less.

As shown in fig. 4, in the diaper 1 of the present embodiment, there are absorbent body non-joined regions 5U where the absorbent body 5 and the outer covering 10 as the outermost sheet are not joined directly or indirectly. Here, "directly joined" means that the absorbent body 5 and the outermost sheet are joined and integrated without any other member being interposed therebetween in a contact manner, and "indirectly joined" means that another member is interposed between the absorbent body 5 and the outermost sheet, and the absorbent body 5 and the outermost sheet are joined and integrated with the other member interposed therebetween. The joining means is not particularly limited, and typically an adhesive such as a hot-melt adhesive is used. In the present embodiment, the back sheet 4 is interposed between the absorbent body 5 and the outer casing 10 (outermost sheet), and when the absorbent body 5 and the outer casing 10 are joined and integrated with the back sheet 4 interposed therebetween, the absorbent body 5 and the outer casing 10 are indirectly joined. However, in the present embodiment, the absorbent body 5 is not formed in this manner, but the absorbent body 5 and the outer package 10 (outermost layer sheet) are not integrated in the absorbent body non-joined region 5U, and are in a state of being able to move independently of each other.

In the diaper 1 of the present embodiment, the absorbent body non-joined region 5U overlaps the overlapping portion of the stretchable region 7T and the low grammage portion 52 in plan view, and the elastic member 7 of the overlapping portion overlapping the absorbent body non-joined region 5U in plan view is not joined to the outer package 10 (outermost sheet). That is, in the absorbent body non-joined region 5U, not only the absorbent body 5 but also the elastic member 7 located at the overlapping portion of the stretchable region 7T and the low grammage portion 52 is not joined to the exterior body 10 (outermost layer sheet).

Therefore, in the diaper 1 of the present embodiment, as shown in fig. 5, in the absorbent body 5 in the worn state, the portion overlapping the absorbent body non-joined region 5U in plan view and also overlapping the overlapping portion of the stretchable region 7T and the low grammage portion 52 is movable in the direction away from the exterior body 10 as the outermost sheet, that is, toward the skin of the wearer, by contraction of the elastic member 7. At this time, the portion of the absorbent body 5 is deformed so as to generally conform to the body of the wearer, which is denoted by reference numeral 100, more specifically, to the shape of the buttocks of the wearer. In addition, at this time, the absorbent body 5 is curved with the low grammage portion 52 extending in the longitudinal direction X as a bending start point so that the low grammage portion 52 protrudes toward the body 100 side of the wearer, deformed into a V-shape or a U-shape in a cross-sectional view along the lateral direction Y as shown in fig. 5, the low grammage portion 52 positioned at the top of the V-shape or the U-shape is disposed along the cleft of the hip of the wearer, and the elastic member 7 enters the low grammage portion 52. The phrase "the elastic member 7 enters the low grammage portion 52" as used herein means that, in the cross-sectional view shown in fig. 5, the elastic member 7 intersects with a virtual extension line 5aL of the non-skin-facing surface 5a of each of the two side portions in the lateral direction Y of the low grammage portion 52 of the absorbent body 5, or is positioned closer to the wearer's body 100 than the virtual extension line 5 aL. In this way, in the worn state of the diaper 1, the absorbent body 5 is deformed so as to float from the member (back sheet 4) located on the non-skin side, the low grammage portion 52 is disposed along the cleft of the buttocks of the wearer, and the elastic member 7 enters the low grammage portion 52, whereby the fitting property of the diaper 1 to the cleft of the buttocks can be further improved, and therefore, the diffusion of excrement to the back side and the leakage from the back side can be further effectively prevented.

The effect of improving the fit by the deformation of the absorbent body 5 can be obtained even when there is no absorbent body non-joined region 5U, and the absorbent body 5 (low grammage portion 52) and the elastic member 7 are directly or indirectly joined to the outer package 10 (outermost sheet), and in such a case, the outer package 10, more specifically, the outer layer sheet 11, which forms the outer surface of the diaper 1 visible from the outside, is bent in the same manner as the deformation of the absorbent body 5, and therefore wrinkles are generated in the outer layer sheet 11, and the appearance of the diaper 1 may be impaired. In this way, the absorbent body non-joined region 5U is effective for improving the fit of the diaper 1 and maintaining the appearance of the diaper 1 when worn.

From the viewpoint of more reliably achieving the above-described operational effects, particularly the effect of maintaining the appearance of the diaper 1 by the absorbent body non-joined region 5U, as shown in fig. 6, the absorbent body non-joined region 5U is preferably longer in the lateral direction Y than the stretchable region 7T, and is preferably formed continuously in the longitudinal direction X over 50% or more, particularly 70% or more, of the entire length in the longitudinal direction X of the stretchable region 7T.

In the diaper 1A shown in fig. 6, the widths of the absorbent body non-joined region 5U, the low grammage portion 52, and the stretchable region 7T are equal to each other, and preferably, the widths are made in the order of the absorbent body non-joined region 5U, the low grammage portion 52, and the stretchable region 7T from long to short, and in the latter preferred embodiment, the low grammage portion 52 has portions extending outward in the lateral direction Y from both side edges of the stretchable region 7T in the longitudinal direction X, and the absorbent body non-joined region 5U has portions extending outward in the lateral direction Y from both side edges of the low grammage portion 52 in the longitudinal direction X. On the other hand, the lengths of the absorbent body non-joined region 5U, the low grammage part 52, and the stretchable region 7T are equal to each other over the entire length in the longitudinal direction X, and preferably, the lengths of the absorbent body non-joined region 5U, the low grammage part 52, and the stretchable region 7T are made in this order from long to short, and in the latter preferred embodiment, the low grammage part 52 has a portion extending outward in the longitudinal direction X from the front and rear ends (both side edges along the lateral direction Y) in the longitudinal direction X of the stretchable region 7T, and the absorbent body non-joined region 5U has a portion extending outward in the longitudinal direction X from the front and rear ends (both side edges along the lateral direction Y) in the longitudinal direction X of the low grammage part 52.

From the same viewpoint, as shown in fig. 7, it is also preferable that the entire stretchable region 7T overlaps the absorbent body non-joined region 5U in plan view. This can more reliably achieve the effect of maintaining the appearance of the diaper 1 by the absorbent body non-joined region 5U. In the diaper 1B shown in fig. 7, not only the stretchable region 7T but also the low grammage portion 52 wider than the stretchable region 7T entirely overlaps the absorbent body non-joined region 5U in a plan view.

As shown in fig. 6 and 7, the width W3, which is the length in the lateral direction Y of the absorbent body non-joined region 5U, is preferably longer than the width W2 of the stretchable region 7T, more specifically, preferably 2 times or more the width W2 of the stretchable region 7T. The width W3 of the absorbent body non-joined region 5U is preferably 10mm or more and 130mm or less, and more preferably 30mm or more and 120mm or less.

From the viewpoint of further achieving the above-described operation and effects, the low grammage portion 52, the stretchable region 7T, and the absorbent body non-joined region 5U are present in at least the rear portion R, respectively. They are more preferably present only in the rear side portion R, although they may also be present in the front side portion F.

As shown in fig. 5, in the diaper 1 of the present embodiment, the back sheet 4 as an intermediate sheet is interposed between the absorbent body 5 and the elastic member 7 and the outer covering 10 as an outermost sheet in the absorbent body non-joined region 5U, and the back sheet 4 is joined to the outer covering 10 and is not joined to the absorbent body 5 and the elastic member 7, in short, in the absorbent body non-joined region 5U, the absorbent body 5 and the elastic member 7 located at the overlapping portion of the stretchable region 7T and the low grammage portion 52 are not directly or indirectly joined to the outermost sheet, and the joining manner of the absorbent body 5, the elastic member 7, the intermediate sheet (back sheet 4), and the outermost sheet (outer covering 10) is not limited to the manner shown in fig. 5. Examples of the joining method in the absorbent body non-joined region 5U include: A) a mode in which the intermediate sheet is joined to the absorbent body 5 and the elastic member 7, but not joined to the outermost sheet; B) a mode in which the intermediate sheet is not joined to the absorbent body 5 and the elastic member 7 but is joined to the outermost sheet (the mode shown in fig. 5); C) the intermediate sheet is not joined to the absorbent body 5 and the elastic member 7, and is not joined to the outermost sheet. In the above-described aspects a) to C), the aspect B) or C) is preferable because the intermediate sheet (back sheet 4) is bent following the deformation of the absorbent body 5 in the worn state of the diaper 1, and therefore, when a pattern or the like is provided on the outer surface (non-skin-facing surface) of the intermediate sheet to improve the appearance of the intermediate sheet, there is a possibility that the appearance improving effect may be reduced.

In the worn state of the diaper 1, from the viewpoint of promoting the deformation of the absorbent body 5 as shown in fig. 5, the penetration of the elastic member 7 into the low-basis-weight portion 52, and further reliably preventing the diffusion of excrement such as loose feces to the back side and the leakage from the back side, it is preferable that the topsheet 3 has a concavo-convex 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. If the convex portions 30 have such a concave-convex configuration, when the absorbent body 5 is deformed so as to be bent at the formation position of the low grammage portion 52, the topsheet 3 also becomes easily bent following such deformation, and the elastic member 7 becomes easily entered into the low grammage portion 52. In the present embodiment, the uneven structure is formed on the skin-facing surface of the topsheet 3 as shown in fig. 4, but may be formed on a non-skin-facing surface (a surface facing the absorbent body 5) or may be formed on both surfaces. If the uneven structure is formed on the skin-facing surface of the topsheet 3, the contact area with the skin of the wearer is reduced, and the effect of improving the dry feeling can be obtained in addition to the above effect. The pattern of the uneven structure of the front sheet 3 is not particularly limited, and any pattern can be employed, provided that the projections 30 and the recesses 31 are alternately arranged in the transverse direction Y. As an example of the pattern of the uneven structure, a pattern in which a plurality of convex portions 30 are arranged in a dispersed manner and each convex portion 30 is surrounded by a concave portion 31 can be given. As another example of the pattern of the uneven structure, a pattern in which the convex portions 30 extending in the longitudinal direction X and the concave portions 31 extending in the longitudinal direction X are alternately arranged in the transverse direction Y can be given.

As described above, the absorbent body 5 of the present embodiment preferably includes: an absorbent core 50 containing an absorbent material; and a core-covering sheet 51 including a non-skin-side core-covering sheet disposed on the non-skin-facing surface of the absorbent core 50 and covering the low grammage portion 52, at least the non-skin-side core-covering sheet being a nonwoven fabric. The covering sheet 51 in accordance with this preferred embodiment is typically a nonwoven fabric as a whole, that is, not only a non-skin-side covering sheet but also a nonwoven fabric in a portion (skin-side covering sheet) disposed on the skin-facing surface of the absorbent core 50. Since the non-skin-side wrapping sheet is a nonwoven fabric, when the absorbent body 5 is deformed as shown in fig. 5 in the worn state of the diaper 1, the elastic member 7 easily enters the low basis weight portion 52, and it is possible to more reliably prevent the diffusion of excrement such as loose stool to the back side and the leakage from the back side, and further, it is possible to improve the strength of the non-skin-side wrapping sheet itself as compared with the case where the non-skin-side wrapping sheet is formed of another liquid-permeable sheet such as paper. As the nonwoven fabric forming the non-skin-side wrapping sheet, various liquid-permeable nonwoven fabrics manufactured by known manufacturing methods can be used without particular limitation, and examples thereof include spunbond + meltblown + spunbond (SMS) nonwoven fabrics.

As shown in fig. 2, non-stretchable regions 8T having no stretchability in both the longitudinal direction X and the lateral direction Y are disposed on both outer sides in the lateral direction Y of the stretchable region 7T in the absorbent body disposition region 5T. If there is another stretchable region having stretchability in the longitudinal direction X and/or the lateral direction Y at a position adjacent to the stretchable region 7T in the lateral direction Y, the stretchable region 7T is affected by the other stretchable region, and there is a possibility that the effect of improving the hip fit due to the above-described cooperative operation of the stretchable region 7T and the low grammage part 52 may not be sufficiently obtained. To eliminate such a fear, it is preferable that the non-stretchable regions 8T are disposed at least in the absorbent body disposition region 5T on both outer sides in the lateral direction Y of the stretchable region 7T.

The non-stretchable region 8T includes not only a form in which the stretchability is zero in both the longitudinal direction X and the lateral direction Y, but also a form in which the stretchability is low although it has stretchability in the longitudinal direction X and/or the lateral direction Y, and the stretchability is regarded as a level at which the stretchability is substantially zero. For example, even if the elastic member is disposed in an extended state in the longitudinal direction X or the lateral direction Y in the vicinity of the absorbent body disposition region 5T (typically, in a region within 10mm from the absorbent body disposition region 5T), the influence of the stretchability due to the elastic member can be greatly reduced by the influence of the absorbent body 5 having a relatively high rigidity, so that the non-stretchable region 8T exists outside the stretchable region 7T in the lateral direction Y. Further, even in the stretchable region overlapping position overlapping the absorbent body disposition region 5T in the thickness direction and overlapping the stretchable region 7T in the longitudinal direction X, the elastic member 61 for leak-proof cuff formation is disposed in an extended state as another elastic member different from the elastic member 7, and the disposition portion of the elastic member 61 is the free end portion of the sheet 60 for leak-proof cuff formation (the leak-proof cuff 6) which is not substantially joined to the absorbent body 5, so that even if the elastic member 61 for leak-proof cuff formation contracts, it contracts in the direction away from the absorbent body 5, and further, the absorbent body 5 bends and deforms only so as to follow the shape of the buttocks of the wearer, and the outside in the lateral direction Y of the stretchable region 7T does not stretch, and therefore, the disposition position of the elastic member 61 can become the non-stretchable region 8T. In the present embodiment, the elastic member 61 for forming the leakage prevention cuffs is disposed on the skin side of the absorbent body disposition region 5T without being joined to the absorbent body 5, and the disposition position of the elastic member 61 can be the non-stretch region 8T. On the other hand, since the leg gather forming elastic members 14 are relatively distant from the absorbent body 5 and are less likely to be affected by the absorbent body 5, the arrangement positions of the elastic members 14 do not become the non-stretch regions 8T.

The non-stretchable region 8T is preferably present at a position separated from the stretchable region 7T to the outside in the lateral direction Y by 10mm or more, more preferably by 15mm or more.

In the diaper 1 of the present embodiment, as shown in fig. 2, when the elastic member 61 for forming the leakage prevention cuffs extends in the longitudinal direction X as another elastic member other than the elastic member 7 at the stretch region overlapping position where the absorber disposition region 5T or its vicinity overlaps the stretch region 7T in the longitudinal direction X, in a state where stretchability is exhibited in the longitudinal direction X, it is preferable that the stretch ratio X1 in the longitudinal direction X of the stretch region 7T at the stretch region overlapping position is the same as the stretch ratio X2 in the longitudinal direction X of the other elastic member (elastic member 61 for forming the leakage prevention cuffs) at the stretch region overlapping position, or is smaller than the stretch ratio X2. That is, it is preferable that a magnitude relation of "the extension ratio X1 in the longitudinal direction X of the stretchable region 7T" is not more than the extension ratio X2 "of the other elastic member at the position where the stretchable region overlaps" is established. The reason for this is as described above, and the above-described telescopic region overlapping position can be replaced with the non-telescopic region 8T. The stretch ratio can be adjusted by appropriately adjusting the type, thickness, and the like of the elastic member (for example, the elastic member 7 in the case of the stretchable region 7T) disposed in the region. As another elastic member, in addition to the elastic member 61 for forming the leakage preventing cuffs, for example, an elastic member called an elastic member for forming absorbent body gathers or the like may be given, which is disposed in the vicinity of the absorbent body 5 (typically, in a region within 10mm from the absorbent body 5) and in an extended state in the longitudinal direction X along the absorbent body 5. The elongation ratio can be measured by the following method.

< method of measuring elongation Rate >

The absorbent article to be measured was unfolded as shown in fig. 2 and was extended to the maximum extent in the longitudinal direction, and a rectangular portion having a longitudinal direction of 50mm and a lateral direction of 40mm in a plan view was cut out from the measurement site (the stretchable region 7T, the stretchable region overlapping position, and the non-stretchable region 8T) in the absorbent article in the maximum extension state to obtain a test piece. At this time, the absorbent body was removed to form a test piece. The length L0(mm) of the test piece in a non-stretched state was measured, and the stretch ratio of the portion to be measured was calculated by the following equation.

The test piece had an elongation of 50mm (longitudinal length of the test piece)/L0 mm

The ratio of the extension ratio X1 in the longitudinal direction X of the stretchable zone 7T to the extension ratio X2 in the longitudinal direction X of the other elastic members (the elastic member 61 for leakproof cuff formation and the elastic member for absorbent body gather formation) is preferably 1 or more, more preferably 1.2 or more, and preferably 2 or less, more preferably 1.8 or less, on the assumption that the extension ratio X1 is not more than the extension ratio X2 and the extension ratio X2/extension ratio X1 are used.

The extension ratio X1 in the longitudinal direction X of the stretch region 7T 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, in the diaper 1 of the present embodiment, when the elastic member 13 for forming waist gather is provided as another elastic member extending in the direction in the lateral direction Y in a state where stretchability is exhibited, the elastic member 7 extending in the direction in the longitudinal direction X in a state where stretchability is exhibited is disposed so as not to intersect with the elastic member 13 for forming waist gather. When the elastic member 7 intersects the elastic member 13 for forming a hip gather, the stretchable region 7T of the elastic member 7 is affected by the elastic member 13, and there is a fear that the effect of improving the hip fit by the cooperation between the stretchable region 7T and the low grammage portion 52 described above cannot be sufficiently obtained. To eliminate such a concern, the elastic member 7 preferably does not intersect with other elastic members extending in the lateral direction Y in a state where stretchability can be exhibited.

In the diaper 1 of the present embodiment, as described above, the 2 elastic members 7 are disposed on the non-skin-facing surface of the absorbent core 50 in the core sheet 51 and joined to the non-skin-facing surface (non-skin-side wrapping sheet) of the absorbent body 5 covering the low grammage portion 52. As described above, by introducing the elastic member 7 at a position closer to the wearer than the absorbent body 5 is on the non-skin side, the effect of improving the hip fit by the cooperation between the stretchable region 7T and the low grammage portion 52 can be obtained more reliably.

In this manner, when the elastic member 7 is joined to the non-skin-side core sheet (core sheet 51), for example, the form shown in fig. 8 and 9 can be adopted.

In the embodiment shown in fig. 8, the elastic member fixing sheet 9 is interposed between the 2 elastic members 7 and the back sheet 4 (the intermediate sheet), and the sheet 9 is joined to the 2 elastic members 7 but not to the back sheet 4. As the sheet 9, a sheet capable of being joined to the elastic member 7, for example, paper, nonwoven fabric, or the like can be used.

In the embodiment shown in fig. 9, both end portions 51S, 51S of 1 core sheet 51 along the longitudinal direction X are disposed so as to cover the non-skin-facing surface of the absorbent core 50, one end portion 51S and the other end portion 51S are overlapped in the central portion of the absorbent core 50 in the transverse direction Y, and 2 elastic members 7 are interposed between the one end portion 51S and the other end portion 51S in the overlapped portion. The 2 elastic members 7 are joined to the both end portions 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-described embodiments, and includes a wide range of articles for absorbing body fluid (urine, menstrual blood, loose stool, sweat, etc.) discharged from a human body, as well as an open-type disposable diaper having a so-called fastening tape, a sanitary napkin, a sanitary panty, and the like.

The present invention has been described above based on the embodiments thereof, but the present invention is not limited to the above embodiments and can be appropriately modified.

For example, in the diaper 1 of the above embodiment, the elastic region may be provided in a member located on the side farther from the skin of the wearer than the absorbent body 5, specifically, in the back sheet 4 and the outer covering 10 (the outer layer sheet 11 and the inner layer sheet 12).

In the diaper 1 of the above embodiment, the outer cover 10 extends continuously from the front side portion F to the rear side portion R, but instead of this, the outer cover 10 may have a member constituting the front side portion F and a member constituting the rear side portion R separately, and the absorbent main body 2 may be fixed by being laid over both members.

All of the components of the above-described embodiment can be appropriately used. The embodiments of the present invention described above further disclose the following.

An absorbent article having a longitudinal direction corresponding to a front-back direction of a wearer and a lateral direction orthogonal to the longitudinal direction, and being divided into a front portion disposed on a stomach side of the wearer and a rear portion disposed on a back side of the wearer when worn, with a center in the longitudinal direction as a boundary, the absorbent article comprising: an absorbent body containing an absorbent material; a topsheet disposed closer to the skin of the wearer than the absorbent member; and an outermost sheet disposed on a side of the absorbent body remote from the skin of the wearer and forming an outer surface visible from the outside,

an elastic member extending in the longitudinal direction in a state where stretchability is exhibited in the longitudinal direction between the absorbent body and the outermost sheet in the widthwise central portion of the absorbent body disposition region overlapping with the absorbent body in a plan view, the elastic member being present at least in the rear side portion,

a low grammage portion of the absorbent material having a smaller mass per unit area than both side portions of the absorbent body in the lateral direction extends in the longitudinal direction in the central portion of the absorbent body in the lateral direction,

in a plan view, the expansion/contraction region of the elastic member overlaps the low grammage portion.

<2> in the absorbent article according to <1>, the mass per unit area of the absorbent material in the low grammage portion is 80% or less of the mass per unit area of the absorbent material present in the lateral side portions of the low grammage portion.

<3> in the absorbent article of <1>, the absorbent body includes an absorbent core containing the absorbent material, and the low grammage portion is a through hole penetrating the absorbent core in a thickness direction.

<4> in the absorbent article according to any one of <1> to <3>, the longitudinal length of the overlapping portion of the stretchable region and the low grammage part in a plan view is 10% or more, preferably 15% or more, of the entire length of the absorbent body in the longitudinal direction.

<5> in the absorbent article according to any one of <1> to <4>, the length in the longitudinal direction of the overlapping portion of the stretchable region and the low grammage portion in a plan view is 50% or less, preferably 35% or less, of the entire length in the longitudinal direction of the absorbent body.

<6> in the absorbent article according to any one of <1> to <5>, the length of the low grammage portion in the longitudinal direction is 10% or more, preferably 15% or more, of the entire length of the absorbent body in the longitudinal direction.

<7> in the absorbent article according to any one of <1> to <6>, the length of the stretchable region in the longitudinal direction is 10% or more, preferably 15% or more of the entire length of the absorbent body in the longitudinal direction.

<8> in the absorbent article according to any one of <1> to <7>, the length (width) of the low grammage portion in the lateral direction is equal to or longer than the length (width) of the stretchable region in the lateral direction.

<9> in the absorbent article according to any one of <1> to <8>, a ratio of the length (width) of the low grammage portion in the lateral direction to the length (width) of the stretchable region in the lateral direction is preferably 1 or more and 3 or less, and more preferably 1.2 or more and 2 or less.

<10> in the absorbent article according to any one of <1> to <9>, there is an absorbent body non-joined region where the absorbent body and the outermost sheet are not directly or indirectly joined, and the absorbent body non-joined region overlaps with an overlapping portion of the stretchable region and the low grammage portion in a plan view,

the elastic member of the overlapping portion overlapping with the absorbent body non-joined region in a plan view is non-joined to the outermost sheet.

<11> in the absorbent article according to <10>, in a worn state, a portion of the absorbent body that overlaps the absorbent body non-joined region in a plan view and also overlaps an overlapping portion of the stretchable region and the low grammage portion is movable in a direction away from the outermost sheet by contraction of the elastic member.

<12> in the absorbent article according to the above <10> or <11>, the absorbent body non-joined region is longer than the stretchable region in the transverse direction, and is continuously formed in the longitudinal direction over 50% or more, preferably 70% or more, of the entire length in the longitudinal direction of the stretchable region.

<13> in the absorbent article according to any one of <10> to <12>, the entire stretchable region overlaps with the absorbent body non-joined region in a plan view.

<14> in the absorbent article according to any one of <10> to <13>, the length (width) in the lateral direction is shortened from the long side in the order of the absorbent body non-joined region, the low grammage portion, and the stretchable region.

<15> in the absorbent article according to any one of <10> to <14>, the longitudinal length is shortened from long to short in the order of the absorbent body non-joined region, the low grammage portion, and the stretchable region.

<16> in the absorbent article according to any one of <1> to <15>, the front sheet has a concavo-convex structure in which convex portions and concave portions are alternately arranged in the lateral direction.

<17> in the absorbent article according to any one of <1> to <16>, the absorbent body includes: an absorbent core containing the absorbent material; and a non-skin-side wrapping sheet disposed on the non-skin-facing surface of the absorbent core and covering the low grammage portion,

the non-skin side wrapping chip is non-woven fabric.

<18> in the absorbent article according to any one of <1> to <17>, the non-stretchable regions having no stretchability in both the longitudinal direction and the lateral direction are disposed in the absorbent body disposition region on both outer sides of the stretchable region in the lateral direction.

<19> in the absorbent article according to <18>, the non-stretchable region is located at a position separated from the stretchable region to the outside in the transverse direction by 10mm or more, preferably 15mm or more.

<20> the absorbent article according to any one of <1> to <19> above, comprising: an absorbent core containing the absorbent material; and a non-skin-side wrapping sheet disposed on the non-skin-facing surface of the absorbent core and covering the low grammage portion,

the elastic member is joined to the non-skin-facing surface of the non-skin-side wrapping sheet.

<21> in the absorbent article according to any one of <1> to <20>, the elastic member is a sheet-like or thread-like elastic member, preferably a thread-like elastic member.

<22> in the absorbent article according to any one of <1> to <21>, an elastic member other than the elastic member is disposed at a position overlapping the stretchable region in the longitudinal direction at or near the absorbent body disposition region and at a position overlapping the stretchable region.

<23> in the absorbent article of <22>, the other elastic member is an elastic member for forming a leakage prevention cuff or an elastic member for forming absorbent body gathers.

<24> in the absorbent article according to <22> or <23>, an elongation percentage in the longitudinal direction of the stretchable region is equal to or smaller than an elongation percentage in the longitudinal direction of the other elastic member at the position where the stretchable region overlaps.

<25> in the absorbent article according to any one of <22> to <24>, a ratio of an extension magnification in the longitudinal direction of the other elastic member at the position where the stretchable region overlaps to an extension magnification in the longitudinal direction of the stretchable region is 1 or more and 2 or less, preferably 1.2 or more and 1.8 or less.

<26> in the absorbent article according to any one of <22> to <25>, the extension magnification 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.

<27> in the absorbent article according to any one of <1> to <26>, the elastic member is present only in the rear side portion.

<28> in the absorbent article according to any one of <1> to <27>, the elastic member is present in a portion corresponding to the cleft of the buttocks of the wearer.

Industrial applicability

According to the present invention, an absorbent article can be provided which has excellent fit to the body of the wearer and can effectively prevent excrement such as loose stool from spreading to the back side or leaking from the back side.

Claims (27)

1. An absorbent article having a longitudinal direction corresponding to a front-back direction of a wearer and a transverse direction orthogonal to the longitudinal direction, and being divided into a front side portion disposed on a stomach side of the wearer and a rear side portion disposed on a back side of the wearer when worn, with a center of the longitudinal direction as a boundary, the absorbent article comprising: an absorbent body containing an absorbent material; a topsheet disposed closer to the skin of the wearer than the absorbent member; and an outermost sheet disposed on the side of the absorbent body remote from the skin of the wearer and forming an outer surface visible from the outside,

the absorbent article is characterized in that:

an elastic member extending in the longitudinal direction in a state where stretchability is exhibited in the longitudinal direction between the absorbent body and the outermost sheet in the widthwise central portion of the absorbent body disposition region overlapping with the absorbent body in a plan view, the elastic member being present at least in the rear side portion,

a low grammage portion of the absorbent material having a smaller mass per unit area than both side portions of the absorbent body in the lateral direction extends in the longitudinal direction in the central portion of the absorbent body in the lateral direction,

in a plan view, there is a region where the elastic member expands and contracts and the low grammage portion overlap,

the longitudinal length of the overlapping portion of the stretchable region and the low grammage portion in a plan view is 50% or less of the entire length of the absorbent body in the longitudinal direction.

2. The absorbent article of claim 1, wherein:

the mass per unit area of the absorbent material in the low grammage portion is 80% or less of the mass per unit area of the absorbent material present in the lateral side portions of the low grammage portion.

3. The absorbent article of claim 1, wherein:

the absorbent body includes an absorbent core containing the absorbent material, and the low grammage portion is a through hole penetrating the absorbent core in a thickness direction.

4. The absorbent article according to any one of claims 1 to 3, wherein:

the longitudinal length of the overlapping portion of the stretchable region and the low grammage portion in a plan view is 10% or more of the entire length of the absorbent body in the longitudinal direction.

5. The absorbent article according to any one of claims 1 to 3, wherein:

the length of the low grammage portion in the longitudinal direction is 10% or more of the entire length of the absorbent body in the longitudinal direction.

6. The absorbent article according to any one of claims 1 to 3, wherein:

the longitudinal length of the stretchable region is 10% or more of the entire length of the absorbent body in the longitudinal direction.

7. The absorbent article according to any one of claims 1 to 3, wherein:

the length of the low grammage portion in the lateral direction is equal to or longer than the length of the stretchable region in the lateral direction.

8. The absorbent article according to any one of claims 1 to 3, wherein:

a ratio of the length of the low grammage portion in the lateral direction to the length of the stretchable region in the lateral direction is 1 or more and 3 or less.

9. An absorbent article according to any one of claims 1 to 3, characterized in that:

an absorbent body non-joined region in which the absorbent body and the outermost sheet are not directly or indirectly joined exists, and the absorbent body non-joined region overlaps with an overlapping portion of the stretchable region and the low grammage portion in a plan view,

the elastic member of the overlapping portion overlapping with the absorbent body non-joined region in a plan view is non-joined to the outermost sheet.

10. The absorbent article of claim 9, wherein:

in the worn state, a portion of the absorbent body that overlaps the absorbent body non-joined region in a plan view and also overlaps the overlapping portion of the stretchable region and the low grammage portion is movable in a direction away from the outermost sheet by contraction of the elastic member.

11. The absorbent article of claim 9, wherein:

the absorbent body non-joined region has a length in the transverse direction longer than that of the stretchable region, and is continuously formed in the longitudinal direction over 50% or more of the entire length in the longitudinal direction of the stretchable region.

12. The absorbent article of claim 9, wherein:

the entire stretchable region overlaps the absorbent body non-joined region in plan view.

13. The absorbent article of claim 9, wherein:

the length in the transverse direction is shorter from the longer length to the shorter length in the order of the absorbent body non-joined region, the low grammage portion, and the stretchable region.

14. The absorbent article of claim 9, wherein:

the length in the longitudinal direction is shortened from a long length to a short length in the order of the absorbent body non-joined region, the low grammage portion, and the stretchable region.

15. The absorbent article according to any one of claims 1 to 3, wherein:

the front surface sheet has a concave-convex structure in which convex portions and concave portions are alternately arranged in the lateral direction.

16. The absorbent article according to any one of claims 1 to 3, wherein:

the absorbent body includes: an absorbent core containing the absorbent material; and a non-skin-side wrapping sheet disposed on the non-skin-facing surface of the absorbent core and covering the low grammage portion,

the non-skin side wrapping chip is non-woven fabric.

17. The absorbent article according to any one of claims 1 to 3, wherein:

non-stretchable regions having no stretchability in both the longitudinal direction and the lateral direction are disposed on both outer sides of the stretchable region in the absorbent body disposition region in the lateral direction.

18. The absorbent article of claim 17, wherein:

the non-stretchable region is located at a position separated from the stretchable region to the outside in the transverse direction by 10mm or more.

19. The absorbent article according to any one of claims 1 to 3, wherein:

the method comprises the following steps: an absorbent core containing the absorbent material; and a non-skin-side wrapping sheet disposed on the non-skin-facing surface of the absorbent core and covering the low grammage portion,

the elastic member is joined to the non-skin-facing surface of the non-skin-side wrapping sheet.

20. The absorbent article according to any one of claims 1 to 3, wherein:

the elastic member is a sheet-like or linear elastic member.

21. The absorbent article according to any one of claims 1 to 3, wherein:

an elastic member other than the elastic member is disposed at a position overlapping the stretchable region in the longitudinal direction at or near the absorbent body disposition region.

22. The absorbent article of claim 21, wherein:

the other elastic member is an elastic member for forming a leakage-preventing cuff or an elastic member for forming absorbent gathers.

23. The absorbent article of claim 21, wherein:

the longitudinal extension ratio of the stretchable region is equal to or smaller than the longitudinal extension ratio of the other elastic member in the stretchable region overlapping position.

24. The absorbent article of claim 21, wherein:

the ratio of the elongation factor in the longitudinal direction of the other elastic member to the elongation factor in the longitudinal direction of the stretchable region at the stretchable region overlapping position is 1 or more and 2 or less.

25. The absorbent article according to any one of claims 1 to 3, wherein:

the longitudinal extension ratio of the stretchable region is 1.5 times or more and 3.5 times or less.

26. The absorbent article according to any one of claims 1 to 3, wherein:

the elastic member is present only in the rear side portion.

27. The absorbent article according to any one of claims 1 to 3, wherein:

the elastic member is present at a portion corresponding to the gluteal cleft of the wearer.

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