JP3240673U - absorbent article - Google Patents

Abstract

An object of the present invention is to provide an absorbent article which is excellent in fit to the wearer's body and which can effectively prevent excretion such as loose feces from diffusing to the back side and leaking from the back side. An absorbent article (underpants-type disposable diaper) 1 includes an absorbent body 2 including an absorbent body 5 and an outer body arranged on the side farther from the wearer's skin than the absorbent body 2, that is, on the non-skin side. (outermost layer sheet) 10; The elastic member 7 extends in the longitudinal direction X in a state capable of exhibiting stretchability in the central portion of the absorber arrangement region 5T in the lateral direction Y and between the absorber 5 and the outermost layer sheet 10. , and the elastic member 7 is present at least on the rear side portion R. As shown in FIG. A low basis weight portion 52 having a smaller mass per unit area of the absorbent material than both side portions in the lateral direction Y extends in the longitudinal direction X at the center portion in the lateral direction Y of the absorbent body 5 . In plan view, the stretchable region 7T where the elastic member 7 exists and the low basis weight portion 52 overlap each other. [Selection drawing] Fig. 2

Description

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

Disposable diapers, which are a type of absorbent article, typically include an absorbent body containing absorbent materials such as hydrophilic fibers and water-absorbing polymers, and a side closer to the wearer's skin than the absorbent body. and a back sheet arranged farther from the wearer's skin than the absorber. Disposable diapers having such a structure are required to fit tightly to the wearer's body and to be excellent in preventing leakage of excrement such as urine and feces.

Patent Document 1 describes a disposable diaper that improves the feel of a sheet that comes in contact with the wearer's skin and gives a softer impression to a wearer such as a mother. An auxiliary sheet is arranged between the top sheet and the absorbent body, and a crotch elastic part is arranged between the absorbent body and the back sheet in the crotch region, and in plan view, the crotch elastic part is It is described to overlap the low basis weight portion, the absorbent body and the auxiliary sheet. The low basis weight part extends in the horizontal direction on both sides along the longitudinal direction of the absorbent body. The crotch stretchable part is composed of a stretchable sheet, or is composed of a plurality of thread-like/belt-like elastic members. The vertical direction here is the direction corresponding to the front-rear direction of the wearer of the absorbent article, and the horizontal direction is the direction perpendicular to the vertical direction. According to the disposable diaper described in Patent Document 1, the region where the crotch elastic part is arranged can be more flexibly deformed, the contraction of the leg elastic part can be absorbed, and the occurrence of wrinkles at unintended locations can be suppressed. It is

In Patent Document 2, a pants-type absorbent article that suppresses leakage of excrement such as menstrual blood while obtaining an underwear-like appearance is disclosed at the lateral center of the absorbent main body on the longitudinal rear side and from the absorbent body. Also, a stretchable part that stretches in the vertical direction is arranged on the non-skin side of the wearer. Patent Literature 2 describes, as a specific example of the stretchable portion, a portion provided with four buttock elastic members 41 exhibiting stretchability in the absorbent main body.

In Patent Document 3, as an improvement technique of a pants-type disposable diaper composed of pants and an absorbent pad positioned inside the pants, an elastic pad extending in the longitudinal direction is provided on the outer surface of the backsheet that constitutes the pad. A member is arranged in a stretched state, and contraction of the elastic member lifts the pad from the inner surface of the pants toward the wearer's skin. According to the underpants-type disposable diaper described in Patent Document 3, the absorbent pad can be brought into close contact with the wearer's skin, and even if the underpants slip down, the pad can be maintained in close contact. It is

JP 2016-7515 A Japanese Unexamined Patent Application Publication No. 2018-267 JP-A-2003-62009

As one of the technical problems of absorbent articles represented by disposable diapers, there is an improvement in loose stool absorption performance. Loose stool is a highly viscous and highly fluid excrement that is particularly common in young children. As a result, loose feces are less likely to be absorbed by the absorber inside the diaper, and loose feces excreted in the crotch portion of the diaper may diffuse to the back side along the surface sheet and leak to the outside. If loose stool spreads from the crotch to the back side, even if it does not leak out of the diaper, the inner surface of the back side of the diaper is soiled with the loose stool, which complicates diaper changing work for the wearer. Inconveniences such as giving a burden to the wearer and causing skin troubles of the wearer may occur.

Conventionally, as means for improving the absorption performance of loose stool, a pocket structure is provided by providing a surface sheet with an uneven structure that makes it difficult for loose stool to diffuse, introducing a member that can absorb loose stool in the crotch portion separately from the absorbent body. Means such as securing a space that can accommodate loose stools are being studied, but these conventional means can prevent loose stools from leaking out from the dorsal side, but sufficiently prevent loose stools from spreading on the dorsal side. The current situation is that it is not possible.

Accordingly, an object of the present invention is to provide an absorbent article that is excellent in fit to the wearer's body and that can effectively prevent excrement such as loose feces from diffusing to the back side and leaking from the back side. .

The present invention has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and a front side portion arranged on the abdomen of the wearer when worn with the center of the longitudinal direction as a boundary. An absorbent body that is divided into a rear side portion that is arranged on the back side of the wearer and contains an absorbent material, a surface sheet that is arranged closer to the wearer's skin than the absorbent body, and the absorbent body. and an outermost layer sheet arranged farther from the wearer's skin than the absorbent article and forming an outer surface visible from the outside, wherein the lateral side of the absorbent body placement region overlaps with the absorbent body in plan view An elastic member extends in the longitudinal direction between the absorber and the outermost layer sheet in the central portion of the direction and in a state capable of exhibiting stretchability in the longitudinal direction, and the elastic member is at least the a low basis weight portion, which is present in the rear side portion and has a lower mass per unit area of the absorbent material than both side portions in the lateral direction of the absorbent body, in the central portion in the lateral direction of the absorbent body; The absorbent article extends in the longitudinal direction, and in a plan view, the stretchable region where the elastic member is present overlaps with the low basis weight portion.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which is excellent in the fitting property with respect to a wearer's body, and can effectively prevent the spreading|diffusion to the back side of excretion, such as loose feces, and leakage from a back side is provided.

FIG. 1 is a perspective view schematically showing the natural state of an underpants-type disposable diaper, which is one 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) of the diaper shown in FIG. 1 in an unfolded and stretched state. FIG. 3 is a cross-sectional view schematically showing a section taken along line II of FIG. 4 is an enlarged cross-sectional view showing an enlarged and simplified main part of FIG. 3. FIG. FIG. 5 is a diagram schematically showing the appearance of the main part shown in FIG. 4 when the diaper 1 shown in FIG. 1 is worn. FIG. 6 is a view equivalent to FIG. 2 of another embodiment of the absorbent article of the present invention. FIG. 7 is a view equivalent 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 equivalent to FIG. 4 of still another embodiment of the absorbent article of the present invention.

The present invention will be described below based on its preferred embodiments with reference to the drawings. In addition, 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, and the ratio of each dimension may differ from the actual one.

1 to 3 show an underpants-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-rear direction of the wearer, that is, a direction extending from the abdominal side to the back side through the crotch portion, and a lateral direction Y perpendicular to the longitudinal direction. Line CLx) is divided into a front side portion F arranged on the abdomen side of the wearer and a rear side portion R arranged on the back side of the wearer when worn, and the absorbent body 5 containing an absorbent material; The surface sheet 3 arranged on the side closer to the wearer's skin than the absorbent body 5 and the outer covering forming the outer surface of the diaper 1 arranged on the side farther from the wearer's skin than the absorbent body 5 and visible from the outside. and a body 10 (outermost layer sheet).

The diaper 1 is a so-called underpants-type disposable diaper, and includes an absorbent body 2 including an absorbent body 5 and an outer body 10 arranged on the side farther from the wearer's skin than the absorbent body 2, that is, on the non-skin side. , and both side edges along the longitudinal direction X of the exterior body 10 in the front side portion F and the exterior body 10 in the rear side portion R are bonded to each other by a known bonding means such as an adhesive, heat sealing, or ultrasonic sealing. , as shown in FIG. 1, a pair of side seals S, S, a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH, LH through which the wearer's lower legs are formed. It is

As shown in FIG. 2, the diaper 1 has an abdominal portion A, which is arranged on the abdomen side of the wearer when worn, a dorsal portion C, which is arranged on the back side of the wearer, and a crotch portion B located between them. It has in direction X. The ventral part A is part of the front part F, the back part C is part of the rear part R, and the crotch part B is located on the boundary between the front part F and the rear part R along the longitudinal center line CLx. in the vertical direction X. The crotch part B includes an excretion part facing part (not shown) that faces the wearer's excretion part (penis, anus, etc.) when the diaper 1 is worn. The vertical center line CLx is an imaginary straight line extending in the horizontal direction Y by halving the diaper 1 in the unfolded and stretched state as shown in FIG. The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is cut off at the side seal portion S to be in the unfolded state, and the elastic members of each part of the diaper 1 in the unfolded state are stretched to the design size (the influence of the elastic member is completely removed). It means the state in which it is expanded until it becomes the same dimension as when it is expanded in a flat state in the excluded state).

The absorbent main body 2 has a rectangular shape in plan view in the unfolded and stretched state of the diaper 1 as shown in FIG. It is aligned with the longitudinal direction X of the diaper 1 in the unfolded and stretched state, is arranged in the lateral direction Y central portion of the exterior body 10, and is joined to the exterior body 10 with an adhesive.

As shown in FIGS. 2 and 3, the absorbent body 2 comprises a liquid-permeable surface sheet 3 forming a skin-facing surface, and a liquid-impermeable, liquid-impermeable or water-repellent sheet forming a non-skin-facing surface. It has a back sheet 4 and a liquid-retaining absorbent 5 interposed between the two sheets 3, 4, which are integrated by a known bonding means such as an adhesive.

As used herein, the term “skin-facing surface” refers to the surface of the absorbent article or its constituent members (eg, absorbent body) that faces the wearer's skin when the absorbent article is worn, that is, the surface of the absorbent article that faces the wearer's skin. The "non-skin facing surface" is the side of the absorbent article or its constituent members that faces away from the skin when the absorbent article is worn, i.e., the side that is relatively far from the wearer's skin. on the side. It should be noted that the term "when worn" as used herein means a state in which the absorbent article is maintained in a normal and appropriate wearing position, that is, in a correct wearing position of the absorbent article.

As the topsheet 3, the backsheet 4 and the absorbent body 5, those conventionally used in this type of absorbent article can be used without particular limitation. As the surface sheet 3, for example, various nonwoven fabrics and perforated films can be used. As the backsheet 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, and as this absorbent material, those used as materials for absorbent bodies in this type of absorbent article can be used without particular limitation. Synthetic fibers that have undergone chemical treatment, water-absorbent 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. of absorbent structures.

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 wrap sheet covering the outer surface (skin-facing surface, non-skin-facing surface) of the absorbent core 50. 51. The absorbent core 50 is typically a fiber stack formed by stacking absorbent materials. As the core wrap sheet 51, for example, liquid-permeable sheets such as paper, various nonwoven fabrics, and perforated 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 a width of, for example, two to three times the length of the absorbent core 50 in the lateral direction Y, and covers the entire skin-facing surface of the absorbent core 50. and extend 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 can be covered. In the core wrap sheet 51 composed of such a single sheet, the portion covering the skin-facing surface of the absorbent core 50 is the skin-side core wrap sheet, and the portion covering 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 a low basis weight portion 52, which will be described later. In addition, the core wrap sheet 51 composed of a plurality of sheets includes, for example, one skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 50, and a skin-side core wrap sheet that is separate from the skin-side core wrap sheet. , and one non-skin-side core wrap sheet covering the non-skin facing surface of the absorbent core 50 .

As shown in FIGS. 2 and 3, both sides along the longitudinal direction X of the skin-facing surface of the absorbent body 2 include liquid-resistant or water-repellent and air-permeable leak-proof cuff-forming sheets 60. A pair of configured leaktight cuffs 6,6 are provided. Each of the pair of leakage-preventing cuff-forming sheets 60, 60 has one end side in the lateral direction Y fixed to another constituent member (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 horizontal direction Y is a free end that is not fixed to other components, and a string-like or band-like leak-proof cuff-forming elastic member 61 is arranged in the longitudinal direction X in a stretched state at the free end. It is In the illustrated embodiment, one elastic member 61 is arranged on each leak-proof cuff 6, but a plurality of elastic members may be provided. The leak-proof cuff 6 stands up at least at the crotch portion B by contracting the elastic member 61 arranged in a stretched state when the diaper 1 is put on, thereby preventing excrement such as loose stool from flowing outward in the lateral direction Y. is blocked.

The outer body 10 forms the outer shape of the diaper 1 in the unfolded and stretched state as shown in FIG. It forms the outline of each dorsal part C. As shown in FIG. 2, the outer body 10 has a rectangular shape in which the abdominal part A and the dorsal part C are longer in the horizontal direction Y than in the vertical direction X, and the outer body 10 is formed in the crotch part B. A pair of leg edge portions LS, LS, which are both side edge portions along the longitudinal direction X of 10, are curved in a convex circular arc shape toward the center in the lateral direction Y, and in a plan view as shown in FIG. The center region of X is constricted inward in the horizontal direction Y to form an hourglass shape.

As shown in FIG. 3, the exterior body 10 of this embodiment has an outer layer sheet 11 and an inner layer sheet 12 in order from the absorbent core 5, and includes a laminate of both sheets 11 and 12. As shown in FIG. When the diaper 1 is worn, the outer layer sheet 11 is located farther from the wearer's body and forms the outer surface of the diaper 1, that is, the non-skin facing surface, and the inner layer sheet 12 is located closer to the wearer's body. to form the inner surface of the diaper 1, ie, the skin-facing surface. The outer layer sheet 11 and the inner layer sheet 12 are bonded to each other and integrated at predetermined sites via a bonding 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 this embodiment is longer than the inner layer sheet 12 in the longitudinal direction X, and has a portion extending from the edge of the inner layer sheet 12 in the longitudinal direction X. is folded back on the skin-facing side of the inner layer sheet 12 to cover the longitudinal direction X end of the absorbent body 2 . The sheets 11 and 12 forming the exterior body 10 may be sheets of the same type, or may be sheets of a different type. The sheets 11 and 12 typically do not have stretchability, but may have stretchability to the extent that the desired effects of the present invention are not impaired. Non-stretchable non-stretchable sheets that can be used as the sheets 11 and 12 include, for example, non-woven fabrics produced by various methods, and specific examples include spunbond non-woven fabrics, air-through non-woven fabrics, and needle-punched non-woven fabrics.

As used herein, the term "elasticity" means the property of being able to stretch in a given direction and shrinking when the stretch is released. A sheet that does not substantially stretch in a certain direction (non-stretchable) means that the sheet hardly stretches even if a pulling force is applied to the sheet in the certain direction. do. For example, for a sample with a length of 15 cm and a width of 5 cm, the sample is pulled in the longitudinal direction with a material tensile tester such as Tensilon, and the elongation at break when the sample breaks is 10% or less. The sample has substantially no stretchability 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, thread-like or band-like waist gather forming elastic members 13 are stretched in the lateral direction Y in the abdominal portion A and the dorsal portion C. , and the plurality of elastic members 13 are intermittently arranged in the vertical direction X at predetermined intervals.
Since the elastic member 13 is arranged in such a manner that its stretchability is exhibited, the ventral side portion A and the dorsal side portion C, which are the portions where the elastic member 13 is arranged, are substantially continuous over the entire circumference. An annular waist gather is formed. The outer body 10 in the abdominal part A and the dorsal part C may have a non-stretchable area where the stretchability of the elastic member 13 is inhibited in the area overlapping the absorbent main body 2 in plan view. Even in this case, the ventral 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 that is fixed in a stretched state in the lateral direction Y. . In addition, one or a plurality of thread-like or band-like leg gather forming elastic members 14 are arranged in a stretched state at leg edge portions LS forming opening edges of the pair of leg opening portions LH, LH. Thereby, a substantially continuous annular leg gather is formed on the opening edge of each of the pair of leg openings LH, LH.
These gather forming elastic members 13 and 14 are sandwiched and fixed between the outer layer sheet 11 and the inner layer sheet 12 forming the exterior body 10 by a bonding means such as an adhesive.

As one of the main features of the diaper 1, as shown in FIGS. 2 to 4, a region (absorber arrangement In the region 5T), the elastic member 7 extends in the longitudinal direction X in a state capable of exhibiting elasticity, and a low basis weight portion 52 extends in the longitudinal direction X at the central portion of the absorbent body 5 in the lateral direction Y. It is pointed out that it extends to Characteristic portions of the diaper 1 will be described in detail below.

In the diaper 1, as shown in FIG. 2, the elastic member 7 extends in the longitudinal direction X between the absorbent body 5 and the outer 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 it can exhibit elasticity.

In this embodiment, two thread-like elastic members 7 are intermittently arranged in the lateral direction Y at the central portion in the lateral direction Y of the absorber arrangement region 5T. The two elastic members 7 are arranged symmetrically with respect to the center (horizontal center line CLy) in the lateral direction Y of the absorber 5 (diaper 1). The horizontal center line CLy is an imaginary straight line extending in the vertical direction X by halving the diaper 1 in the unfolded and stretched state as shown in FIG.

In this embodiment, as shown in FIG. 3, each of the two elastic members 7 is a portion of the core wrap sheet 51 that covers 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 (non-skin facing surface 5a of the absorbent body 5) of the non-skin side core wrap sheet covering the low basis weight portion 52 in a state of being stretched in the longitudinal direction X. Therefore, the elastic member 7 extends in the longitudinal direction X in a state in which elasticity can be exhibited in the longitudinal direction X. As shown in FIG. 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 shape of the elastic member 7 is not limited to a filament shape, and various shapes can be adopted as long as the desired effects of the present invention can be achieved. The sheet-like elastic member is a so-called elastic sheet, and may be, for example, lattice-like (net-like) or film-like. In addition, the arrangement of the elastic members 7 is not particularly limited. One sheet-like elastic member (elastic sheet) having the same area as the area of the non-skin facing 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 shrinkage, the elastic member 7 is preferably made of a thread-like elastic member.

The elastic member 7 should be present at least in the rear side portion R in consideration of the effects thereof, which will be described later. In this embodiment, both of the two elastic members 7 are present on the rear side portion R as shown in FIG. However, the elastic member 7 may be present in the front side portion F. For example, the elastic member 7 extends across the boundary between the front side portion F and the rear side portion R (longitudinal center line CLx) in the longitudinal direction X. , the elastic member 7 may be present on both the front side F and the rear side R.

In the diaper 1, as described above, the elastic member 7 expresses stretchability in the longitudinal direction X in the absorbent body placement region 5T in the rear side portion R and between the absorbent body 5 and the outer body 10 (outermost layer sheet). In addition to extending in the same direction as possible, the central portion in the lateral direction Y of the absorbent body 5 has more "mass per unit area of absorbent material" than both sides thereof in the lateral direction Y. A low basis weight portion 52 having a small basis weight (so-called basis weight) extends in the longitudinal direction X. As shown in FIG.

The absorbent body 5 of this embodiment includes an absorbent core 50 containing an absorbent material, and a low basis weight portion 52 is formed in the absorbent core 50 . The low basis weight portion 52 is a portion having a smaller basis weight than both sides of the low basis weight portion 52 in the lateral direction Y of the absorbent body 5 (absorbent core 50). A form in which no absorbent material is present in the portion 52 (that is, a form in which the basis weight of the absorbent material is zero) and 2) a form in which the low basis weight portion 52 contains an absorbent material are included. The low basis weight portion 52 of the present embodiment is in the form of 1) above as shown in FIG. The low basis weight portion 52, which is a through hole, has a rectangular shape in plan view as shown in FIG.

In the low basis weight portion 52 of the form 2), a smaller amount of absorbent material is present than both side portions of the low basis weight portion 52 in the absorbent body 5 in the lateral direction Y. As shown in FIG. Typically, the mass per unit area of the absorbent material present in the low basis weight portion 52 is relative to the mass per unit area of the absorbent material present on both sides of the low basis weight portion 52 in the lateral direction Y. , 80% by mass or less. As for the density of the absorbent 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 former is not necessarily smaller than the latter in terms of thickness. However, the former may be equal to the latter, or the former may be larger than the latter.

A method for forming the low basis weight portion 52 is not particularly limited. As an example of a method for forming the low basis weight portion 52, in the step of laying an absorbent material such as wood pulp in manufacturing the absorbent core 50, the absorbent material is intentionally stacked in the portion where the low basis weight portion 52 is to be formed. A method of inhibiting is mentioned. The method for forming such a low basis weight portion 52 can be implemented in a conventionally known method for manufacturing an absorbent core. In the method of manufacturing the absorbent core 50 by sucking and depositing on a mold, the mold has a predetermined pattern, for example, a portion corresponding to the low basis weight portion 52 protrudes upward compared to the peripheral portion. It can be implemented by using a mold. In addition, as another example of the method of forming the low basis weight portion 52, the absorbent core 50 that does not have the low basis weight portion 52 is manufactured, and a predetermined portion of the absorbent core 50 is subjected to die-cutting, cutting, or the like. A method of forming the low basis weight portion 52 by processing may be mentioned.

In the diaper 1, when viewed from above (projected in the thickness direction of the absorbent body 5), the stretchable region 7T where the elastic members 7 are present and the low basis weight portion 52 overlap each other. It is characterized in that it overlaps with the low basis weight portion 52 . In the present embodiment, the hatched portion in FIG. 2 is the elastic region 7T. The stretchable region 7T generally has stretchability in the longitudinal direction X, similar to the elastic member 7 disposed thereon.

The stretchable region 7T corresponds to the elastic member 7 in a plan view of the diaper 1 as shown in FIG. 10) and extending in the longitudinal direction X. The "elastic member 7" here means the elastic member 7 in a state where elasticity can be expressed, That is, it means "an elastic member 7 fixed in a stretched state in the longitudinal direction X". For example, as a typical fixed form of the elastic member 7, both ends in the longitudinal direction of the elastic member 7 are not fixed to other members (for example, the core wrap sheet 51), or even if fixed, they are fixed in the stretched state. However, there is a form in which the portion sandwiched between the longitudinal ends of the elastic member 7 (hereinafter also referred to as the "longitudinal center portion") is fixed to another member in a stretched state. In such a fixed form of the elastic member 7, the elastic member 7 can exhibit elasticity only at the central portion in the longitudinal direction. 7T. In other words, when a part of the elastic member 7 (for example, both ends in the longitudinal direction) cannot exhibit stretchability, the rest of the elastic member 7 (for example, the central part in the longitudinal direction) , is the elastic region 7T.

Further, when the plurality of elastic members 7 are intermittently arranged in the lateral direction Y as in the present embodiment, the outermost portion on one side in the lateral direction Y in plan view of the plurality of elastic members 7 Among the regions sandwiched between the outer edge of the elastic member 7 and the outer edge of the outermost elastic member 7 on the other side in the horizontal direction Y, the stretchable region 7T is a portion that can exhibit elasticity. be. Here, the "outer edge of the elastic member 7" is the side edge of the elastic member 7 along the longitudinal direction X that is relatively far from the center of the absorbent body 5 in the lateral direction Y (lateral center line CLy). is the lateral edge. For example, in this embodiment, two elastic members 7 are intermittently arranged in the horizontal direction Y as shown in FIG. Therefore, the stretchable region 7T is a portion that overlaps with the two elastic members 7 and a portion that is sandwiched between the two elastic members 7 (hatched portion in FIG. 2) in plan view. If the longitudinal ends of each of the two elastic members 7 cannot exhibit stretchability, the portions other than the longitudinal ends of each of the two elastic members 7 and the portion sandwiched therebetween in plan view is the elastic region 7T.

In the diaper 1, as described above, i) the elastic member 7 can exhibit stretchability in the longitudinal direction X at least in the absorbent body arrangement region 5T of the rear side portion R on the side farther from the wearer's skin than the absorbent body 5. ii) the low basis weight portion 52 extends in the longitudinal direction X at the central portion of the absorber 5 in the lateral direction Y; ), the stretchable region 7T where the elastic member 7 is present overlaps with the low basis weight portion 52, and the configuration of i) to iii) allows the diaper 1 to fit the wearer's body, especially the wearer's buttocks. It has an excellent fit to the groove (gluteal cleft) and can effectively prevent excretion such as loose stools from diffusing to the dorsal side and from leaking from the dorsal side. That is, the central portion in the lateral direction Y of the absorbent body placement region 5T of the rear side portion R, where the elastic member 7 is located, corresponds to the gluteal cleft of the wearer of the diaper 1. In addition, there is a stretchable 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 a stretched state. A portion of the absorbent body 5 that overlaps the stretchable region 7T in a plan view can be deformed along the gluteal cleft of the wearer, and as a result, fit to the gluteal cleft can be improved. However, since the absorber 5 is basically a member having a relatively large basis weight and high rigidity in order to ensure the necessary absorption performance, there is a concern that the elastic member 7 will not be deformed by the degree of contraction of the elastic member 7 . In this regard, in the diaper 1, the absorbent body 5 is provided with the low basis weight portion 52, and the low basis weight portion 52 and the stretchable region 7T are configured to overlap with each other in a plan view. When the diaper 1 is worn, the diaper 1 is in close contact with the buttocks of the wearer centering on the overlapped portion of the low-basis-weight portion 52 and the stretchable region 7T, thereby preventing excrement from diffusing to the back side and leaking from the back side. can be effectively prevented.

In particular, in the present embodiment, the low basis weight portion 52 is a through hole, and since the absorbent material is not substantially present in the low basis weight portion 52, the low basis weight portion 52 (through hole) is the starting point when the diaper 1 is worn. As a result, the absorbent body 5 is easily bent and easily deformed along the gluteal cleft of the wearer, so that the above-described effects can be achieved more reliably.

The low basis weight portion 52 may be arranged at a position where at least a portion thereof overlaps with the stretchable region 7T in plan view. As described above, the elastic member 7 of the stretchable 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, so the low basis weight portion 52 is also at least at the same position as the elastic member 7. placed.

From the viewpoint of ensuring the effects described above, the longitudinal length L1 (see FIG. 2) of the overlapping portion between the stretchable region 7T and the low basis weight portion 52 in plan view is The total length of X is preferably 10% or more, more preferably 15% or more. On the other hand, if the vertical length L1 of the overlapping portion between the stretchable region 7T and the low basis weight portion 52 is too long, there is a risk that the absorbent performance will be reduced, and that the diaper 1 will feel uncomfortable when worn. The upper limit of the directional length L1 is preferably 50% or less, more preferably 35% or less, of the total length of the absorber 5 in the longitudinal direction X.

Regarding the above-mentioned "full length in the vertical direction X of the absorbent body 5", the absorbent body 5 is composed of a plurality of members (absorbent core 50, core wrap sheet 51) as in the present embodiment, and each member When the total length of X is different, unless otherwise specified, 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 absorbent body 5 is the "full length in the vertical direction of the absorbent body 5". . For example, when the core wrap sheet 51 extends from the front and rear ends of the absorbent core 50 in the longitudinal direction X, the total length of the core wrap sheet 51 in the longitudinal direction X (the length from one end to the other end in the longitudinal direction X) ) is the total length of the absorber 5 in the longitudinal direction X.

From the viewpoint of achieving the above-described effects more reliably, the overlapping portion between the stretchable region 7T and the low basis weight portion 52 in a plan view has a relatively shorter length in the vertical direction X. is continuous in the longitudinal direction X over 50% or more, particularly 70% or more. In the form shown in FIG. 2, the length of the low basis weight portion 52 in the vertical direction X is longer than that of the stretchable region 7T, and in a plan view, the stretchable region 7T entirely overlaps the low weight basis portion 52 in the vertical direction X. The low basis weight portion 52 extends outward in the longitudinal direction X from the front end in the longitudinal direction X (one end on the front side portion F side) of 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 basis weight portion 52 is 100% of the total length in the vertical direction X of the stretchable region 7T, which has the relatively shorter total length in the vertical direction X. %, and the vertical length L1 (see FIG. 2) of the overlapping portion is the same as the total length in the vertical direction X of the elastic region 7T.

In the present invention, the length in the longitudinal direction X may be the same or different between the low basis weight portion 52 and the elastic region 7T. 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, of the total length of the absorbent body 5 in the vertical direction X. The length of the stretchable region 7T in the longitudinal direction X is preferably 10% or more, more preferably 15% or more, of the total length of the absorbent body 5 in the longitudinal direction X.

The length (width W1) in the horizontal direction Y of the low basis weight portion 52 (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 horizontal 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 contains an absorbent core as in the present embodiment, the absorbent core means the width (maximum width) of
A width W1 in the horizontal direction Y of the low basis weight portion 52 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 width W2 (see FIG. 4) of the elastic region 7T in the lateral direction Y may be the same as or different from the width W1 of the low basis weight portion 52. Although it does not matter, the bending (see FIG. 5) of the absorbent body 5 starting from the low basis weight portion 52 when the diaper 1 is worn is promoted to prevent excrement such as loose feces from diffusing to the back side and leaking from the back side. From the viewpoint of more reliably preventing protrusion, the width W1 of the low basis weight portion 52 is preferably equal to or longer than the width W2 of the elastic region 7T. The ratio of the width W1 of the low basis weight portion 52 to the width W2 of the elastic region 7T is preferably 1 or more, more preferably 1.2 or more, and preferably 3 or less, more preferably 2 as width W1/width W2. It is below.
For example, when two thread-like elastic members 7 are intermittently arranged in the horizontal direction Y as in the present embodiment, the portion of the absorbent body 5 that overlaps the stretchable region 7T in a plan view is the buttocks of the wearer of the diaper 1. From the viewpoint of promoting deformation along the crack, the width W2 of the elastic region 7T is preferably 5 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less.

Further, when two thread-like elastic members 7 are intermittently arranged in the lateral direction Y as in the present embodiment, the pitch between the elastic members 7 adjacent in the lateral direction Y (the center of the adjacent elastic members 7 The separation distance P1 (see FIG. 4) between the parts 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 are absorber non-bonded regions 5U where the absorber 5 and the outer layer sheet 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 being in contact with each other without intervening other members, and "indirectly joined" It 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 adhesive. In this embodiment, since the back sheet 4 is interposed between the absorbent body 5 and the exterior body 10 (outermost layer sheet), the absorbent body 5 and the exterior body 10 are joined and integrated with the back sheet 4 interposed therebetween. If so, 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-joining region 5U, the absorbent body 5 and the exterior body 10 (outermost layer sheet) are not integrated and are in a state in which they can move independently. be.

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

Therefore, when the diaper 1 of the present embodiment is worn, as shown in FIG. Due to contraction of the elastic member 7, the portion overlapping with the outermost layer can move away from the outer body 10, which is the outermost layer sheet, that is, toward the wearer's skin. At this time, such a portion of the absorbent body 5 is normally deformed so as to follow the shape of the wearer's body indicated by reference numeral 100, more specifically the wearer's buttocks. At this time, the absorbent body 5 is bent with the low basis weight portion 52 extending in the vertical direction X as the starting point of the bending so that the low basis weight portion 52 protrudes toward the wearer's body 100 side, and is laterally stretched as shown in FIG. A low basis weight portion 52 that is deformed into a V-shape or a U-shape in a cross-sectional view along the direction Y and positioned at the top of the V-shape or U-shape is arranged along the gluteal cleft of the wearer. The elastic member 7 enters into 52 . Here, "the elastic member 7 enters the low basis weight portion 52" means that, in a cross-sectional view as shown in FIG. crosses the virtual extension line 5aL of the non-skin facing surface 5a, or crosses the virtual extension line 5aL and is positioned closer to the wearer's body 100. In this way, when the diaper 1 is worn, the absorbent member 5 is positioned on the non-skin side of the member (back sheet 4).
The low basis weight part 52 is arranged along the gluteal cleft of the wearer, and the elastic member 7 enters the low basis weight part 52, so that the fit of the diaper 1 to the gluteal cleft is further improved. Therefore, it is possible to more effectively prevent excrement from diffusing to the dorsal side and leaking from the dorsal side.

Such an effect of improving the fit property by deformation of the absorbent body 5 is that the absorbent body non-joining region 5U does not exist, and the absorbent body 5 (low basis weight portion 52) and the elastic member 7 are combined with the outer body 10 (outermost layer sheet). ), but in that case, the outer layer sheet 11 forms the outer surface of the diaper 1 visible from the outside, more specifically the outer layer sheet 11, and the absorbent body 5 Therefore, the outer layer sheet 11 may be wrinkled and the appearance of the diaper 1 may be spoiled. Thus, the absorbent body non-joining region 5U is effective in maintaining the appearance of the diaper 1 while it is being worn while improving the fit of the diaper 1 .

From the viewpoint of further ensuring the effect of maintaining the appearance of the diaper 1 by the absorbent body non-bonded region 5U, the absorbent body non-bonded region 5U is formed as a stretchable region as shown in FIG. It is preferable that the length (width) in the lateral direction Y is longer than that of 7T, and that the elastic region 7T is continuous in the longitudinal direction X over 50% or more, particularly 70% or more of the total length in the longitudinal direction X.

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

From the same point of view, as shown in FIG. 7, it is also preferable that the entire stretchable region 7T overlaps the absorber non-joining region 5U in plan view. As a result, the effect of maintaining the appearance of the diaper 1 by the absorbent body non-joining region 5U can be more reliably achieved. In the diaper 1B shown in FIG. 7, not only the elastic region 7T but also the wider low basis weight portion 52 entirely overlaps the absorber non-bonded region 5U in plan view.

As shown in FIGS. 6 and 7, it is preferable that the length in the horizontal direction Y of the non-bonded absorbent region 5U, that is, the width W3 is longer than the width W2 of the stretchable region 7T, specifically the width of the stretchable region 7T. It is preferably at least twice W2. Width W3 of absorber non-joining 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 ensuring the effects described above, it is preferable that the low basis weight portion 52, the elastic region 7T, and the absorber non-joining region 5U are present at least in the rear side portion R, respectively. These may be present on the front side F, but are more preferably present only on the rear side R.

In the diaper 1 of the present embodiment, as shown in FIG. 5, in the absorbent body non-joining region 5U, a back sheet is provided as an intermediate sheet between the absorbent body 5 and the elastic member 7 and the outer body 10 which is the outermost layer sheet. 4 is interposed, and the backsheet 4 is joined to the exterior body 10 and is not joined to the absorbent body 5 and the elastic member 7. 5 and the elastic member 7 positioned at the overlapping portion of the elastic region 7T and the low basis weight portion 52 are not directly or indirectly joined to the outermost layer sheet. The joining form between the sheet (back sheet 4) and the outermost layer sheet (armor 10) is not limited to the form shown in FIG. Examples of such joining forms in the absorbent body non-joining region 5U include: A) a form in which the intermediate sheet is joined to the absorbent body 5 and the elastic member 7 and is not joined to the outermost layer sheet; A mode in which the intermediate sheet is not bonded to the absorbent body 5 and the elastic member 7 and is bonded to the outermost layer sheet (the mode shown in FIG. 5), C) The intermediate sheet is the absorbent body 5 and the elastic member 7 and the outermost layer sheet are also unbonded. Among the above-mentioned forms A) to C), the above-mentioned form A) is such that the intermediate sheet (back sheet 4) bends following the deformation of the absorbent body 5 when the diaper 1 is worn. If the appearance of the intermediate sheet is enhanced by applying a pattern such as a pattern to the surface facing the skin), the effect of improving the appearance may be reduced, so there is no such possibility. ) or C) are preferred.

When the diaper 1 is worn, the absorbent body 5 is deformed as shown in FIG. From the viewpoint of more reliably preventing leakage from the top sheet 3, as shown in FIG. . When the projections 30 have such an uneven structure, when the absorbent body 5 is bent at the formation position of the low basis weight portion 52, the top sheet 3 is easily bent following this deformation, and the low basis weight portion is formed. The elastic member 7 can easily enter 52 . In this embodiment, as shown in FIG. 4, the uneven structure is formed on the surface facing the skin of the topsheet 3, but it may be formed on the non-skin facing surface (the surface facing the absorbent body 5). may be formed. If the surface facing the skin of the surface sheet 3 is formed with an uneven structure, the contact area with the wearer's skin is reduced, so that in addition to the effects described above, the effect of improving dryness can be achieved. The pattern of the concave-convex structure of the surface sheet 3 is not particularly limited, and any pattern can be adopted on the premise that the convex portions 30 and the concave portions 31 are alternately arranged in the horizontal direction Y. As an example of the uneven structure pattern, there is a pattern in which a plurality of protrusions 30 are arranged in a scattered pattern, and each protrusion 30 is surrounded by a recess 31 . Another example of the uneven structure pattern is a pattern in which convex portions 30 extending in the longitudinal direction X and concave portions 31 extending in the longitudinal direction X are alternately arranged in the lateral direction Y. FIG.

As described above, the absorbent body 5 of the present embodiment includes an absorbent core 50 containing an absorbent material, and a non-skin-side core disposed on the non-skin facing surface of the absorbent core 50 and covering the low basis weight portion 52. It is preferable that at least the non-skin-side core wrap sheet is a non-woven fabric. The core wrap sheet 51 adopting such a preferred form is typically entirely made of nonwoven fabric, that is, not only the non-skin side core wrap sheet but also the portion disposed on the skin-facing surface of the absorbent core 50. (Skin side core wrap sheet) is also a nonwoven fabric. Since the non-skin side core wrap sheet is a non-woven fabric, when the absorbent body 5 is deformed as shown in FIG. Diffusion of excrement to the back side and leakage from the back side can be more reliably prevented, and the non-skin side core wrap sheet is formed from another 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 it is. As the non-woven fabric forming the non-skin side core wrap sheet, various liquid-permeable non-woven fabrics produced by known production methods can be used without particular limitation, for example, spunbond-meltblown-spunbond (SMS) nonwoven fabrics. is mentioned.

As shown in FIG. 2, non-stretchable regions 8T having no stretchability in both the longitudinal direction X and the lateral direction Y are arranged outside the stretchable regions 7T in the absorber placement region 5T in the lateral direction Y. there is If another stretchable region having elasticity in the longitudinal direction X and/or the lateral direction Y exists 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. In addition, there is a concern that the effect of improving the buttocks fitting property due to cooperation between the stretchable region 7T and the low basis weight portion 52 described above may not be sufficiently exhibited. In order to eliminate such concern, it is preferable that the non-stretchable regions 8T are arranged on both sides of the stretchable region 7T in the lateral direction Y at least in the absorber arrangement region 5T.

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 the stretchability in the longitudinal direction X and/or the lateral direction Y. is low and can be regarded as substantially zero elasticity. For example, even if the elastic member is arranged in a stretched state in the vertical direction X or the horizontal direction Y in the vicinity of the absorbent body placement region 5T (typically within 10 mm from the absorbent body placement region 5T), the rigidity is relatively low. Due to the influence of the large absorber 5, the influence of the stretchability of the elastic member is greatly reduced, so that the non-stretchable region 8T exists outside the stretchable region 7T in the lateral direction Y. Further, an elastic member 61 for forming a leakage-preventing cuff is provided as another elastic member separate from the elastic member 7 at a stretchable region overlap position overlapping the absorber arrangement region 5T in the thickness direction and the stretchable region 7T in the longitudinal direction X. Even if the elastic member 61 is arranged in the stretched state, the arrangement portion of the elastic member 61 is the free end of the leak-preventive cuff forming sheet 60 (leak-preventive cuff 6) that is not substantially joined to the absorbent body 5. Even if the leakage cuff forming elastic member 61 shrinks, it shrinks in the direction away from the absorber 5, and the absorber 5 only bends and deforms along the shape of the wearer's buttocks. The outer side in the direction Y is not stretched, so the elastic member 61 can be arranged in the non-stretchable region 8T. In this embodiment, the elastic member 61 for forming a leak-proof cuff is arranged on the skin side of the absorbent body placement region 5T without being joined to the absorbent body 5, and the elastic member 61 can be placed in the non-stretchable region 8T. On the other hand, since the leg gather forming elastic member 14 is relatively distant from the absorbent body 5 and is not easily affected by the absorbent body 5, the arrangement position of the elastic member 14 does not become the non-stretchable region 8T.
The non-stretchable region 8T is preferably located outside the stretchable region 7T in the lateral direction Y, preferably at a distance of 10 mm or more, more preferably 15 mm or more.

In the diaper 1 of the present embodiment, as shown in FIG. 2 , at or near the absorber arrangement region 5T and at a stretchable region overlapping position overlapping the stretchable region 7T in the longitudinal direction X, an elastic member other than the elastic member 7 is provided. The leakage-preventing cuff-forming elastic member 61 as the elastic member extends in the longitudinal direction X in a state capable of exhibiting elasticity in the same direction. The expansion ratio X1 is preferably the same as or smaller than the expansion ratio X2 in the longitudinal direction X of the other elastic member (leakage-preventive cuff-forming elastic member 61) at the stretchable region overlapping position. In other words, it is preferable to establish a magnitude relationship of "expansion ratio X1 of the stretchable region 7T in the longitudinal direction X≦expansion ratio X2 of the other elastic member at the position where the stretchable regions overlap". The reason for this is as described above, and the stretchable region overlap position can be replaced with the non-stretchable region 8T. The expansion ratio can be adjusted by appropriately adjusting the type and thickness of the elastic member (for example, the elastic member 7 in the elastic region 7T) arranged in the region. As the other elastic members, in addition to the leakage-preventing cuff forming elastic member 61, for example, near the absorber 5 (typically within 10 mm from the absorber 5), which is also called an absorber gather forming elastic member, etc. area) and stretched in the longitudinal direction X along the absorber 5 can be exemplified. The extension ratio is measured by the following method.

<Method for measuring elongation ratio>
The absorbent article to be measured is unfolded and stretched to the maximum in the longitudinal direction as shown in FIG. A rectangular shape of 50 mm in the vertical direction and 40 mm in the horizontal direction is cut out from the sheet to obtain a test piece. At this time, the absorber is removed and used as a test piece. The length L0 (mm) of the test piece in a non-stretched state is measured, and the stretch ratio of the portion to be measured is calculated by the following formula.
Elongation magnification of test piece = 50 mm (longitudinal length of test piece) / L0 mm

The ratio between the expansion ratio X1 in the longitudinal direction X of the stretchable region 7T and the expansion ratio X2 in the vertical direction X of the other elastic members (the elastic member 61 for forming the leak-proof cuff and the elastic member for forming the absorber gathers) is the expansion ratio. On the premise that X1≦extension ratio X2, the ratio of 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 stretch ratio X1 in the longitudinal direction X of the stretchable 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, the diaper 1 of this embodiment has a waist-gather forming elastic member 13 as another elastic member extending in the lateral direction Y in a state capable of exhibiting elasticity in the same direction. However, the elastic member 7 extending in the longitudinal direction X in a state capable of exhibiting stretchability is arranged so as not to intersect with the elastic member 13 for forming waist gathers. When the elastic member 7 and the elastic member 13 for forming waist gathers intersect, the stretchable region 7T in which the elastic member 7 exists is affected by the elastic member 13, and the cooperation between the stretchable region 7T and the low basis weight portion 52 is affected. There is concern that the effect of improving the fit to the buttocks due to the action may not be sufficiently exhibited. In order to eliminate such concerns, it is preferable that the elastic member 7 does not intersect with other elastic members extending in the lateral direction Y in a state in which elasticity can be exhibited.

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 to cover the low basis weight portion 52 (non-skin side core wrap sheet), that is, the non-skin facing surface 5a of the absorbent body 5. In this way, by introducing the elastic member 7 at a position closer to the wearer and closer to the wearer's skin than the absorbent body 5, the effect of improving the buttocks fitting property due to cooperation between the elastic region 7T and the low basis weight portion 52 can be obtained. It will play more reliably.

When joining the elastic member 7 to the non-skin-side core wrap sheet (core wrap sheet 51) in this way, for example, the forms shown in FIGS. 8 and 9 can be employed.
In the form shown in FIG. 8, a sheet material 9 for fixing elastic members is interposed between the two elastic members 7 and the back sheet 4 (the intermediate sheet). , 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, nonwoven fabric, or the like can be used.
In the form shown in FIG. 9, both ends 51S, 51S along the longitudinal direction X of one core wrap sheet 51 are arranged so as to cover the non-skin facing surface of the absorbent core 50, and one end 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 A 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 a pants-type disposable diaper as in the above embodiment, but widely includes articles used for absorbing body fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body, Also included are unfoldable disposable diapers, sanitary napkins, sanitary shorts and the like having so-called fastening tapes.

Although the present invention has been described above based on the embodiments thereof, the present invention is not limited to the above embodiments and can be modified as appropriate.
For example, in the diaper 1 of the above-described embodiment, elastic regions are provided in the members located farther from the wearer's skin than the absorbent body 5, specifically the backsheet 4 and the outer body 10 (outer layer sheet 11, inner layer sheet 12). may be provided.
Further, in the diaper 1 of the above-described embodiment, the outer body 10 continuously extends from the front side portion F to the rear side portion R, but instead of this, the outer body 10 constitutes the front side portion F. It is also possible to independently have a member that forms the back side portion R and a member that forms the rear side portion R, and that the absorbent main body 2 is fixed across both members.
All the parts that only one embodiment has as described above can be used interchangeably as appropriate. The following remarks are further disclosed with respect to the above-described embodiments of the present invention.

<1>
It has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and has a front side portion arranged on the ventral side of the wearer when worn with the center of the longitudinal direction as a boundary, and the back of the wearer. an absorbent body containing an absorbent material, a surface sheet disposed closer to the wearer's skin than the absorbent body, and a wearer's body rather than the absorbent body. An absorbent article comprising an outermost layer sheet arranged on the far side from the skin of the absorbent article and forming an outer surface visible from the outside,
The elastic member is provided in a state in which the elastic member can exhibit stretchability in the longitudinal direction at the lateral central portion of the absorbent body placement region overlapping the absorbent body in a plan view and between the absorbent body and the outermost layer sheet. longitudinally extending, the elastic member being present at least on the rear side;
A low basis weight portion having a lower weight per unit area of the absorbent material than both side portions of the absorbent body in the horizontal direction extends in the longitudinal direction in the central portion of the absorbent body in the horizontal direction. ,
An absorbent article in which the stretchable region in which the elastic member is present overlaps with the low basis weight portion in a plan view.
<2>
The above <1>, wherein the mass per unit area of the absorbent material in the low-basis-weight portion is 80% or less of the mass per unit area of the absorbent material in both sides of the absorber in the lateral direction. absorbent article.
<3>
The absorbent according to <1> above, wherein the absorbent body includes an absorbent core containing the absorbent material, and the low basis weight portion is a through hole penetrating the absorbent core in the thickness direction. sexual goods.

<4>
The length in the longitudinal direction of the overlapping portion between the stretchable region and the low basis weight portion in a plan view is 10% or more, preferably 15% or more, of the total length of the absorbent body in the longitudinal direction. The absorbent article according to any one of 1> to <3>.
<5>
The length in the vertical direction of the overlapping portion between the stretchable region and the low basis weight portion in a plan view is 50% or less, preferably 35% or less, of the total length of the absorbent body in the vertical direction. The absorbent article according to any one of 1> to <4>.
<6>
Any one of <1> to <5>, wherein the longitudinal length of the low basis weight portion is 10% or more, preferably 15% or more, of the total length of the absorbent body in the longitudinal direction. absorbent article.
<7>
The absorption according to any one of <1> to <6>, wherein the longitudinal length of the elastic region is 10% or more, preferably 15% or more, of the total length of the absorbent body in the longitudinal direction. sexual 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 elastic region. Absorbent article according to.
<9>
The ratio of the horizontal length (width) of the low basis weight portion to the horizontal length (width) of the elastic 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> above.

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

<16>
The absorbent article according to any one of <1> to <15> above, wherein the topsheet has an uneven structure in which convex portions and concave portions are alternately arranged in the lateral direction.
<17>
The absorbent body comprises an absorbent core containing the absorbent material, and a non-skin-side core wrap sheet disposed on the non-skin facing surface of the absorbent core and covering 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 nonwoven fabric.
<18>
<1> to <17, wherein a non-stretchable region having no stretchability in both the longitudinal direction and the lateral direction is disposed outside the stretchable region in the absorber arrangement region in the lateral direction. The absorbent article according to any one of >.
<19>
The absorbent article according to <18> above, wherein the non-stretchable region is located outside the stretchable region in the lateral direction by 10 mm or more, preferably 15 mm or more.
<20>
comprising an absorbent core containing the absorbent material and a non-skin-side core wrap sheet disposed on the non-skin facing surface of the absorbent core and covering the low basis weight portion,
The absorbent article according to any one of <1> to <19>, wherein the elastic member is joined to the non-skin facing surface of the non-skin side core wrap sheet.
<21>
The absorbent article according to any one of <1> to <20> above, wherein the elastic member is a sheet-like or thread-like elastic member, preferably a thread-like elastic member.

<22>
<1> to <21, wherein another elastic member separate from the elastic member is disposed at or near the absorber arrangement region and at a stretchable region overlap position overlapping the stretchable region in the longitudinal direction. The absorbent article according to any one of >.
<23>
The absorbent article according to <22>, wherein the other elastic member is a leak-preventive cuff-forming elastic member or an absorbent body gather-forming elastic member.
<24>
<22> or <23> above, wherein the stretch ratio in the longitudinal direction of the stretchable region is the same as or smaller than the stretch ratio in the longitudinal direction of the other elastic member at the position where the stretchable regions overlap. absorbent article.
<25>
A ratio of the vertical extension ratio of the other elastic member at the overlapping position of the stretchable regions to the vertical stretch ratio of the stretchable regions 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> above.
<26>
Any one of <22> to <25> above, wherein the stretching 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. absorbent article.
<27>
The absorbent article according to any one of <1> to <26>, wherein the elastic member is present only on the rear portion.
<28>
The absorbent article according to any one of <1> to <27>, wherein the elastic member is present in a portion corresponding to the gluteal cleft of the wearer.

1, 1A, 1B Pants-type disposable diaper (absorbent article)
2 Absorbent main body 3 Top sheet 30 Convex portion 31 Concave portion 4 Back sheet 5 Absorber 50 Absorbent core 51 Core wrap sheet 52 Low basis weight portion 6 Leak-proof cuff 60 Leak-proof cuff forming sheet 61 Leak-proof cuff forming elastic member 7 Elastic member 10 Exterior body (outermost layer sheet)
11 Outer layer sheet 12 Inner layer sheet 13 Waist gather forming elastic member 14 Leg gather forming elastic member 5T Absorber placement region 5U Absorber non-joining region 7T Stretchable region 8T Non-stretchable region F Front part R Rear part A Abdominal part B Inseam C Back side X Vertical direction Y Lateral direction

Claims (13)

It has a longitudinal direction corresponding to the front-rear direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and has a front side portion arranged on the ventral side of the wearer when worn with the center of the longitudinal direction as a boundary, and the back of the wearer. an absorbent body containing an absorbent material, a surface sheet disposed closer to the wearer's skin than the absorbent body, and a wearer's body rather than the absorbent body. An absorbent article comprising an outermost layer sheet arranged on the far side from the skin of the absorbent article and forming an outer surface visible from the outside,
The elastic member is provided in a state in which the elastic member can exhibit stretchability in the longitudinal direction at the lateral central portion of the absorbent body placement region overlapping the absorbent body in a plan view and between the absorbent body and the outermost layer sheet. longitudinally extending, the elastic member being present at least on the rear side;
A low basis weight portion having a lower weight per unit area of the absorbent material than both side portions of the absorbent body in the horizontal direction extends in the longitudinal direction in the central portion of the absorbent body in the horizontal direction. ,
In a plan view, the stretchable region where the elastic member is present and the low basis weight portion overlap,
The absorbent article, wherein the length in the longitudinal direction of the overlapping portion of the stretchable region and the low basis weight portion in plan view is 50% or less of the total length of the absorbent body in the longitudinal direction. 2. The absorbent article according to claim 1, wherein the absorbent body includes an absorbent core containing the absorbent material, and the low basis weight portion is a through-hole passing through the absorbent core in the thickness direction. . 3. The absorbent article according to claim 1, wherein the length in the longitudinal direction of the overlapped portion of the stretchable region and the low-basis portion in plan view is 10% or more of the total length of the absorbent body in the longitudinal direction. . There is an absorber non-bonded region in which the absorber and the outermost layer sheet are not directly or indirectly bonded, and in a plan view, the absorber non-bonded region overlaps the stretchable region and the low basis weight portion. overlaps with the
4. The absorbent article according to any one of claims 1 to 3, wherein the elastic member in the overlapped portion overlapping the non-bonded absorbent region in plan view is not bonded to the outermost layer sheet. In the worn state, a portion of the absorbent body that overlaps with the absorbent body non-joining region in a plan view and also overlaps with the overlapping portion of the stretchable region and the low basis weight portion separates from the outermost layer sheet due to contraction of the elastic member. 5. The absorbent article according to claim 4, wherein the absorbent article is movable in a direction. 6. The absorbent body non-bonding region according to claim 4 or 5, wherein the length in the horizontal direction is longer than that of the stretchable region and is continuous in the longitudinal direction over 50% or more of the total length of the stretchable region in the longitudinal direction. absorbent article. 7. The absorbent article according to any one of claims 4 to 6, wherein the stretchable region entirely overlaps the non-bonded absorbent region in plan view. 8. The absorbent article according to any one of claims 1 to 7, wherein the topsheet has an uneven structure in which protrusions and recesses are alternately arranged in the lateral direction. The absorbent body comprises an absorbent core containing the absorbent material, and a non-skin-side core wrap sheet disposed on the non-skin facing surface of the absorbent core and covering the low basis weight portion. ,
The absorbent article according to any one of claims 1 to 8, wherein the non-skin side core wrap sheet is a nonwoven fabric. 10. A non-stretchable region having no stretchability in both the longitudinal direction and the lateral direction is disposed outside the stretchable region in the absorber placement region in the lateral direction. 1. The absorbent article according to item 1. comprising an absorbent core containing the absorbent material and a non-skin-side core wrap sheet disposed on the non-skin facing surface of the absorbent core and covering the low basis weight portion,
The absorbent article according to any one of claims 1 to 10, wherein the elastic member is joined to the non-skin facing surface of the non-skin side core wrap sheet. The absorbent article according to any one of claims 1 to 11, wherein said elastic member is present only on said rear side portion. 13. The absorbent article according to any one of claims 1 to 12, wherein the elastic member is present in a portion corresponding to the gluteal cleft of the wearer.

Images