CN118019514A

CN118019514A - Absorbent article

Info

Publication number: CN118019514A
Application number: CN202280064969.8A
Authority: CN
Inventors: 山本了一; 梶原顺; 恩田蓝子
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2021-11-19
Filing date: 2022-11-18
Publication date: 2024-05-10
Also published as: JP2023075937A; WO2023090408A1

Abstract

The absorbent article (1) of the present invention has an absorbent body (5) comprising an absorbent body (4), and the absorbent body (4) comprises a core-in-sheet (49) and an absorbent core (40). The absorbent core (40) has an upper absorbent core (41) located on the skin-facing side and a lower absorbent core (42) located on the non-skin-facing side. The absorbent article (1) has a pair of fastening portions. The anchoring portion comprises a fastener tape (7). The longitudinal end of the absorber (4) is located in the belt presence area (A9). The upper layer absorbent core 41 is preferably formed by mixing and integrating water-absorbent fibers and water-absorbent polymers. The lower absorbent core 42 is preferably constituted by forming a layer of water-absorbent polymer between two fibrous sheets.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

Conventionally, there is known a developed disposable diaper in which a side panel having a fastener tape and extending in the width direction of an absorbent body is attached to a portion of the absorbent body including the absorbent body, which is disposed on the back side of a wearer when worn.

In the diaper described in patent document 1, the fastener tape attached to the back side portion of the diaper has a fixing portion fixed to the back side portion and a protruding portion protruding outward in the width direction of the diaper than the fixing portion. The protruding portion is composed of a front end portion and a main body portion located closer to the fixing portion than the front end portion. A reinforcing nonwoven fabric layer is provided at the fixing portion and the distal end portion. The elongated elastic member is fixed in an elongated state so as to straddle the fixing portion and the main body portion. In addition, the elongated elastic member is fixed in an elongated state so as to span the main body portion and the distal end portion.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-22550

Disclosure of Invention

The present invention relates to an absorbent article.

In one embodiment, the absorbent article preferably has a longitudinal direction corresponding to the front-rear direction of the wearer and a transverse direction orthogonal to the longitudinal direction, and has a crotch portion arranged in the crotch of the wearer, an abdomen portion arranged on the abdomen side of the wearer from the crotch portion, and a back portion arranged on the back side of the wearer from the crotch portion in the longitudinal direction.

In one embodiment, it is preferable that the absorbent article has an absorbent body containing an absorber.

In one embodiment, it is preferred that the absorbent body comprises a core-in-package sheet and an absorbent core.

In one embodiment, it is preferable that the absorbent core has an upper absorbent core located on the skin-facing side and a lower absorbent core located on the non-skin-facing side.

In one embodiment, it is preferable that the absorbent article has a pair of fastening portions extending laterally outward from both side edge portions in the back side portion along both side edge portions in the longitudinal direction of the absorbent main body.

In one embodiment, each of the fastening portions preferably has a fastener tape extending laterally outward at both side edge portions of the fastening portion.

In one embodiment, it is preferable that the longitudinal end portion of the absorbent body is located in a belt existing region on the absorbent body as a region overlapping the fastener belt in the longitudinal direction when the absorbent body is seen from the longitudinal outside to the longitudinal inside along a longitudinal center line extending in the longitudinal direction bisecting the absorbent body in the transverse direction in a plan view.

Drawings

Fig. 1 is a plan view schematically showing a skin-facing surface side of a disposable diaper, which is one embodiment of an absorbent article of the present invention, in a developed and extended state.

Fig. 2 is a schematic cross-sectional view of line I-I of fig. 1.

Fig. 3 is a schematic cross-sectional view of line II-II of fig. 1.

Fig. 4 is a schematic cross-sectional view of line III-III of fig. 1.

Fig. 5 is a plan view schematically showing a skin-facing surface side and a back surface portion when a disposable diaper as another embodiment of the absorbent article of the present invention is formed in an unfolded and extended state.

Fig. 6 is a schematic cross-sectional view of the IV-IV line of fig. 5.

Detailed Description

However, in the diaper disclosed in patent document 1, a gap is likely to be generated between the diaper and the waist of the wearer without being in close contact with the waist of the wearer, and leakage may occur from the gap.

The present invention relates to an absorbent article having high fit to a wearer and being less likely to leak from the back side.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings, based on a disposable diaper as a preferred embodiment thereof.

A disposable diaper (hereinafter also simply referred to as a diaper) 1 shown in fig. 1 to 4 is one embodiment of a developed diaper. As shown in fig. 1, the diaper 1 has a longitudinal direction X extending from the abdomen side to the back side of the wearer via the crotch portion and a transverse direction Y orthogonal thereto.

The diaper 1 has a crotch portion M disposed in the crotch of the wearer, an abdomen portion F disposed closer to the abdomen of the wearer than the crotch portion M, and a back portion R disposed closer to the back of the wearer than the crotch portion M in the longitudinal direction X. The crotch M includes a excretory part opposing part (not shown) which is disposed to oppose the excretory part of the wearer such as the urethra or anus when worn. The abdomen side portion F, the crotch portion M, and the back side portion R correspond to the respective regions when the diaper 1 is divided into three in the longitudinal direction X.

The diaper 1 comprises a liquid-permeable front sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retentive absorbent member 4 interposed between the two sheets 2, 3. The front sheet 2, the back sheet 3, and the absorber 4 are integrated by bonding with an adhesive or the like, and constitute an absorbent body 5. The absorbent body 5 has a rectangular shape long in the longitudinal direction X in a plan view shown in fig. 1, and is disposed continuously from the abdominal side portion F to the back side portion R. The diaper 1 is formed symmetrically with respect to a longitudinal center line CLx which bisects the absorbent main body 5 in the transverse direction Y and extends in the longitudinal direction X.

The diaper 1 has a pair of side fastening portions 8, 8 fastened to both side edge portions 5S, 5S of the absorbent main body 5 in the back side portion R along the longitudinal direction X. The pair of side fastening portions 8, 8 are fastened to the absorbent main body 5 so as to extend outward in the lateral direction Y from both side edge portions 5S, 5S of the absorbent main body 5 in the back side portion R.

The front sheet 2 and the back sheet 3 each have a larger size than the absorber 4, and extend outward from the peripheral edge of the absorber 4. The extending portions of the front sheet 2 and the back sheet 3 are joined to each other with or without other members interposed therebetween by known joining means such as adhesive, heat sealing, and ultrasonic sealing.

As the front sheet 2 and the back sheet 3, various materials used in such an absorbent article in the related art can be used, respectively, without particular limitation. For example, various nonwoven fabrics, apertured films, and the like can be used as the front sheet 2, and a resin film, a laminate of a resin film and a nonwoven fabric, and the like can be used as the back sheet 3.

The back sheet 3 has, for example, a form in which a liquid impermeable film sheet is separated and a form in which an outer sheet, for example, a nonwoven fabric is laminated on the outer surface side, which is the non-skin-facing surface of the film sheet.

The absorbent body 4 includes a liquid-retentive absorbent core 40 and a core wrap 49 covering the absorbent core 40.

The absorbent core 40 of the present embodiment is formed in a shape long in the longitudinal direction X in a plan view shown in fig. 1. The absorbent core 40 shown in fig. 2 has a laminated structure including an upper absorbent core 41 positioned on the skin-facing surface side and a lower absorbent core 42 positioned on the non-skin-facing surface side, and the outer surface of the absorbent core is covered with a single core wrap 49 in a state where the absorbent cores 41 and 42 are adjacent to each other. Instead of this configuration, the absorbent body 4 may be configured such that each of the absorbent cores 41 and 42 is covered with one core wrap 49, or may be configured such that the absorbent core 40 is covered with a plurality of core wraps.

In the following description, unless otherwise specified, the absorbent body 4 will be described as an absorbent core 40 including two absorbent cores 41 and 42 each having two layers, and as a whole as a core wrap 49.

The absorbent core 40 of the present embodiment has a two-layer laminated structure including the upper absorbent core 41 and the lower absorbent core 42, but may have a laminated structure of three or more layers instead of this structure. In this case, the upper absorbent core 41 may have another absorbent core on the skin-facing surface side, or the lower absorbent core 42 may have another absorbent core on the non-skin-facing surface side. Or may have other absorbent cores between the upper absorbent core 41 and the lower absorbent core 42.

The absorbent cores 41 and 42 of the present embodiment each have a rectangular shape in plan view, and are disposed continuously from the abdomen side portion F to the back side portion R. The arrangement area of the lower absorbent core 42 is formed larger than the arrangement area of the upper absorbent core 41. That is, the area of the lower absorbent core 42 is larger than the area of the upper absorbent core 41 in plan view. The absorbent cores 41 and 42 of the present embodiment are arranged in a state where both side edges in the lateral direction Y and side edges in the longitudinal direction X in the abdominal side portion F are aligned with each other. On the other hand, the absorbent cores 41 and 42 are disposed so that the side edges in the longitudinal direction X of the back side portion R are different from each other.

In the present embodiment, the longitudinal direction X side edge of the upper layer absorbent core 41 in the back side portion R is disposed so as to be located inside the longitudinal direction X of the longitudinal direction X side edge of the lower layer absorbent core 42 in the back side portion R. That is, the lower absorbent core 42 in the back side portion R extends further to the outside in the longitudinal direction X than the longitudinal direction X side edge of the upper absorbent core 41 in the back side portion R. In the present embodiment, the thickness of the lower absorbent core 42 is smaller than the thickness of the upper absorbent core 41.

In the present specification, the "skin-facing surface" refers to a surface of the absorbent article or a component thereof that faces the skin side of the wearer when the absorbent article is worn, that is, is relatively close to the skin side of the wearer, and the "non-skin-facing surface" refers to a surface of the absorbent article or a component thereof that faces the opposite side of the skin side, that is, is relatively far from the skin side of the wearer when the absorbent article is worn.

In the present specification, "when worn" means a state in which a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and does not include a state in which the absorbent article is in a state of being deviated from the wearing position.

In the present specification, the term "developed and extended state" means a state in which the diaper 1 is brought into a developed state, and the elastic bodies of the respective parts of the diaper 1 in the developed state are extended and expanded to a design size (the same size as when the diaper is expanded into a planar shape in a state in which the influence of the elastic bodies is completely removed).

The absorbent core 40 can use a material generally used as a forming material of such an absorbent core without particular limitation. The absorbent core 40 is constituted of, for example, a fiber-assembled body of water-absorbent fibers such as pulp, a fiber-assembled body of a mixture of the water-absorbent fibers and a water-absorbent polymer, a stacked body of the water-absorbent polymer, an absorbent sheet in which a layer of the water-absorbent polymer is formed between the same or two different fiber sheets, or the like. A plurality of them may be used in combination.

As the constituent sheets of the core sheet 49 and the absorbent sheet, for example, liquid-permeable fibrous sheets such as paper and nonwoven fabric can be used independently.

The upper absorbent core 41 and the lower absorbent core 42 may contain the same kind of forming material, or may contain different kinds of forming materials. For example, both the upper absorbent core 41 and the lower absorbent core 42 may be composed of a mixed fiber body obtained by mixing and integrating water-absorbent fibers and water-absorbent polymers, or both the upper absorbent core 41 and the lower absorbent core 42 may be composed of an absorbent sheet in which a layer of water-absorbent polymers is formed between the same or two different fiber sheets. The upper absorbent core 41 may be made of a hybrid laminate and the lower absorbent core 42 may be made of an absorbent sheet, or the upper absorbent core 41 may be made of an absorbent sheet and the lower absorbent core 42 may be made of a hybrid laminate.

In addition, as described above, when the thickness of the lower absorbent core 42 is smaller than the thickness of the upper absorbent core 41, for example, the fiber-accumulating state of the fiber-accumulating body can be changed, and the absorbent cores 41 and 42 can be configured so that the grammage is different, or the upper absorbent core 41 can be formed as a fiber-accumulating body, and the lower absorbent core 42 can be formed as an absorbent sheet.

Among them, the upper layer absorbent core 41 is preferably composed of a mixed fiber structure in which water-absorbent fibers and water-absorbent polymers are mixed and integrated. By using the hybrid fiber, the liquid absorption retention of excreted liquid such as urine is improved, and leakage of liquid to the outside of the diaper can be prevented.

The lower absorbent core 42 is preferably composed of an absorbent sheet in which a layer of a water-absorbent polymer is formed between the same or two different fibrous sheets. By using the absorbent sheet, the lower absorbent core 42 can be configured to have a high liquid absorption property, and the thickness can be made thin, so that the entire diaper including the back side portion R can be made thin. In addition, the fit of the diaper to the wearer can be improved, and leakage of liquid to the outside of the diaper can be prevented.

In the present embodiment, the upper layer absorbent core 41 is constituted by a hybrid fiber laminate, and the lower layer absorbent core 42 is constituted by an absorbent sheet.

As such an absorbent sheet, for example, an absorbent sheet described in the manual of international publication No. 2021/132338 can be used.

The diaper 1 has a pair of leakage preventing cuffs 55, 55 disposed along both side portions of the absorbent main body 5 in the longitudinal direction X. They are components separate from the absorbent body 5.

The leakage preventing cuff 55 includes a water-repellent and breathable cuff forming sheet 56 and one or more cuff forming elastic members 57. One end side of the flange forming sheet 56 in the leakage preventing flange 55 in the transverse direction Y is fixed to other members (the front sheet 2 and the back sheet 3 in the illustrated embodiment) to form a fixed end, and the other end side of the transverse direction Y is a free end which is not fixed to other members. The elastic members 57 for burring are fixed in an elongated state in the longitudinal direction X at the free ends of the burring sheets 56. Thereby, the leakage preventing cuff 55 can expand and contract in the longitudinal direction X.

When the diaper 1 is worn, the free end portion side of the leakage preventing cuff 55 is raised toward the wearer with the fixed end portion of the other member as the raised base end at least in the crotch portion M by the contraction force of the elastic member 57, whereby the outflow of excrement such as urine to the outside in the lateral direction Y is prevented.

As shown in fig. 1, the pair of side fastening portions 8, 8 have fastener tapes 7 extending laterally outward at both side edge portions of the side fastening portion 8. Specifically, the pair of side fastening portions 8, 8 includes stretchable side panels 6 that are fastened to the absorbent main body 5 so as to extend outward in the lateral direction Y from the side edge portions 5S of the absorbent main body 5, and further includes fastener tapes 7 that are fastened to the side panels 6 so as to extend outward in the lateral direction Y from the side panels 6. The side flap 6 and the fastener tape 7 constituting the side fastening portion 8 are members separate from the absorbent main body 5.

As shown in fig. 1, the side flap 6 has a side flap 61 having a quadrangular shape in a plan view on both lateral sides of the back side portion R. In addition to this, the side flap 6 preferably includes a plurality of elastic members 62 fixed in an elongated state and extending in the lateral direction Y. The plurality of elastic members 62 are disposed at predetermined intervals in the longitudinal direction X at the central portion of the side flap 6 in the lateral direction Y. The side flap 6 is formed, for example, such that the elastic member 62 is fixed between the two side flap sheets 61. By providing the elastic member 62 on the side flap 6, the formation of a gap with the skin surface of the wearer located in the vicinity of the side flap 6 can be reduced, and leakage of liquid from the vicinity of the side flap 6 can be prevented.

The arrangement portion (the central portion in the lateral direction Y) of the elastic member 62 in the side flap 6 is a stretchable portion stretchable in the lateral direction Y, which is the direction in which the elastic member 62 extends, and each side flap 6 has stretchability in the lateral direction Y. The side panels 6 are fixed between the constituent members of the diaper 1 (for example, between the front sheet 2 and the back sheet) by a known joining method such as an adhesive on the lateral inner edge side of the side panels along the longitudinal direction X, which is relatively close to the longitudinal center line CLx.

As shown in fig. 1, the fastener tape 7 includes a tape base 71 and a locking portion 72. The tape base 71 has a rectangular shape in a plan view as shown in fig. 1, and one end side in the longitudinal direction (the lateral direction Y) thereof is fixed to the lateral outer end side of the side flap 6 by a known bonding method such as an adhesive.

The locking portion 72 is fixed to the skin-facing surface of the tape base 71. The locking portion 72 is formed of, for example, a hook member, a loop member, or the like of a mechanical surface fastener, and is detachably locked to a fixed region (not shown) formed on the non-skin-facing surface of the abdomen-side portion F of the diaper 1. In addition, an adhesive may be used as the locking portion 72.

As the side sheet 61 constituting the side flap 6, for example, nonwoven fabrics, woven fabrics, knitted fabrics, papers, resin films, and the like based on various methods of producing hot air nonwoven fabrics, hot-rolled nonwoven fabrics, spun-laced nonwoven fabrics, melt-blown nonwoven fabrics, and the like, and sheets in which two or more of them are laminated and integrated, and the like can be used.

As the tape base 71 constituting the fastener tape 7, nonwoven fabric, a laminate of nonwoven fabric and a resin film, or the like can be used, for example.

An area to be fastened (not shown) to which the fastener tape is fastened is formed on the non-skin-facing surface of the diaper 1 on the abdomen-side portion F. The fixed region can be formed by disposing a mechanical surface fastener or the like on the non-skin-facing surface of the back sheet 3 forming the non-skin-facing surface of the absorbent main body 5.

As shown in fig. 1, the side flaps 59, 59 are formed on both side edges 5S, 5S of the absorbent main body 5 in the longitudinal direction X in the side portions F. Each of the ventral flaps 59 is made of a non-stretchable sheet material. The sheet constituting the abdominal-side flap 59 is fixed between the constituent members of the diaper 1 by a known joining method such as an adhesive on the inner edge side, as in the case of the side flap 6. By forming such a ventral flap 59, the fit of the diaper 1 is further improved.

One of the characteristics of the diaper of the present invention is that the arrangement position of the side flaps 6 in the side fastening portions 8 and the arrangement position of the absorbent body have a predetermined relationship in a plan view in the developed and extended state shown in fig. 1. In the following description, for convenience of description, description will be focused mainly on the back side R.

In detail, it is preferable that the end portion in the longitudinal direction X of the absorbent body 4 exists in the region where the side panels 6 exist when the absorbent body 5 in the back side portion R of the diaper 1 is viewed in the longitudinal direction X.

In the present embodiment, the end portion in the longitudinal direction X of the absorbent body 4 is present in a part of the absorbent main body in a region overlapping the side flap 6 in the longitudinal direction, that is, in a region where the flap is present. As a result, a core lamination area A3 (see fig. 2) described later exists in the fin existing area. The core lamination area A3 is present so as to extend outward in the longitudinal direction X from the inner end of the fin presence area in the longitudinal direction X.

The "flap existing region" is a region on the absorbent main body located between a virtual straight line R1 connecting the longitudinal direction X outer ends of the side flaps 6, 6 to each other and a virtual straight line R2 connecting the longitudinal direction X inner ends of the side flaps 6, 6 to each other in the back side portion R in a plan view shown in fig. 1, and is denoted by a reference numeral A7.

By providing the end portions of the absorbent body 4 in the longitudinal direction X in the flap presence region A7, the liquid absorption and retention properties in the back side portion R can be improved when the diaper is worn, and the gap between the back of the wearer and the diaper 1 is less likely to be formed, so that the fit can be improved, and particularly, the liquid leakage from the back side can be prevented.

In addition, in the case where the longitudinal direction X outside end or the longitudinal direction X inside end of the side flap 6 is not parallel to the lateral direction Y, the flap existing region A7 is defined as follows. That is, when PS1 is the intersection point of the lateral Y outside end of the member fixed to the lateral Y inside end of the side flap 6 and the longitudinal X outside end of the side flap 6, PS2 is the intersection point of the lateral Y outside end of the member and the longitudinal X inside end of the side flap 6, the region on the absorbent body located between the intersection point PS1 and the intersection point PS2 is the flap existing region A7.

When the length of the tab presence area A7 along the longitudinal direction X is set to be the length L1 and the length of the longitudinal direction X end region (core lamination area A3) of the absorbent body 4 present in the tab presence area A7 along the longitudinal direction X is set to be the length L2, the percentage of the ratio (L2/L1) of the length L2 to the length L1 is preferably 30% or more, more preferably 50% or more, preferably 90% or less, and still more preferably 85% or less. By forming such an arrangement relationship, both the liquid absorption retention property and the fitting property can be improved, and the liquid leakage from the back side can be effectively prevented. In addition, when the longitudinal direction X outside end or the longitudinal direction X inside end of the side flap 6 is not parallel to the transverse direction Y, the length L1 is the distance from the intersection PS1 to the intersection PS 2.

The length L2 is a length along the longitudinal direction X from a virtual straight line R2 connecting the inner ends of the longitudinal direction X of the side flaps 6, 6 to each other to a position of the outer end of the longitudinal direction X of the upper absorbent core 41 in the back side portion R of the absorbent body 4 in the plan view shown in fig. 1.

In the flap existing region A7, it is preferable that the absorbent main body 5 in the back side portion R of the diaper 1 has a plurality of regions having different constituent materials when seen from the outside in the longitudinal direction X to the inside in the longitudinal direction X in a plan view.

Specifically, when viewed from the outside in the longitudinal direction X to the inside in the longitudinal direction X, it is preferable that: the non-existing region A1 (see fig. 4) which is a region where the absorber 4 does not exist; a core-existing region A2 (see fig. 3) which is a region in which the upper absorbent core 41 is absent and the lower absorbent core 42 is present among constituent materials of the absorber 4; and a core lamination area A3 (refer to fig. 2) where the upper absorbent core 41 and the lower absorbent core 42 are present.

The non-existing region A1, the core-existing region A2, and the core-laminated region A3 described above are preferably all present on the longitudinal center line CLx of the absorbent main body 5.

The core-existing region A2 may be at least one in which the upper absorbent core 41 is not present, and for example, only the lower absorbent core 42 may be present, or the core-spun sheet 49 and the lower absorbent core 42 may be present. In the present embodiment, the core-existing region A2 does not exist in the upper absorbent core 41, and the core-spun sheet 49 and the lower absorbent core 42 exist.

The core lamination area A3 may be provided with at least the upper absorbent core 41 and the lower absorbent core 42, and for example, only the two absorbent cores 41 and 42 may be provided, and the core wrap 49 may be provided. In the present embodiment, the core lamination area A3 includes the core sheet 49 and the two absorbent cores 41 and 42. That is, in the present embodiment, the core lamination area A3 can be regarded as the same as the existing area of the absorber 4.

As described above, since the absorbent main body 5 has a plurality of regions having different constituent materials, the absorbent main body 5 in the flap existing region A7 has a structure in which constituent members are reduced from the inside to the outside in the longitudinal direction X thereof, and therefore the rigidity is reduced stepwise in the region in which the side flap 6 exists. As a result, the diaper 1 can be effectively attached along the back of the wearer, and leakage of liquid from the back side can be more effectively prevented.

As shown in fig. 4, the non-existing region A1, which is a region where the absorber 4 is not present, is a region where the absorbent core 40 and the core wrap 49, which are constituent members of the absorber 4, are not present, and is a region where members other than the constituent members of the absorber 4, such as the front sheet 2 and the back sheet 3, are present when viewed in the thickness direction Z. That is, the non-existing region A1 is a region between a virtual straight line R1 connecting the outer ends of the side flaps 6, 6 in the longitudinal direction X to each other in the back side portion R, and a position closest to the outer end in the longitudinal direction X among the positions where the constituent members of the absorbent body 4 exist in the back side portion R in the plan view shown in fig. 1. The non-existing region A1 in the present embodiment is located in an area outside the longitudinal direction X of the area in which the side flap 6 exists. The same structure as that of the non-existing region A1 is continuously formed to the outer end in the longitudinal direction X of the diaper 1 located outside the region.

When the length of the non-existing region A1 existing in the flap existing region A7 along the longitudinal direction X is the length L3, the percentage of the length L3 to the ratio of the length L1 (L3/L1) is preferably 0% or more, more preferably 2% or more, preferably 25% or less, and still more preferably 10% or less. By virtue of such arrangement, both of the liquid absorption retention property and the fitting property can be improved, and leakage of liquid from the back side can be effectively prevented.

The length L3 is a length along the longitudinal direction X from a virtual straight line R1 connecting the longitudinal direction X outer ends of the side flaps 6,6 to each other to a position closest to the longitudinal direction X outer end among the portions where the constituent members of the absorbent body 4 exist in the plan view shown in fig. 1 and in the back side portion R.

As shown in fig. 3, the core-existing region A2 is a region where the upper absorbent core 41 and the lower absorbent core 42 are not present in the constituent materials of the absorber 4. In the present embodiment, the core-existing region A2 also includes the core-spun sheet 49. The core-existing region A2 is located inside the non-existing region A1 in the longitudinal direction X and outside the core-laminated region A3 in the longitudinal direction X, and the non-existing region A1 and the core-existing region A2 are adjacent to the core-existing region A2 and the core-laminated region A3, respectively.

The lower absorbent core 42 present in the core-existing region A2 of the present embodiment is in the form of an absorbent sheet in which a layer of particles of the water-absorbent polymer 45 is formed between two fibrous sheets 43, 44 that are the same or different. The absorbent sheet constituting the lower absorbent core 42 of the present embodiment is provided with the water-absorbent polymer 45 in the entire area in plan view thereof, and the water-absorbent polymer 45 is present to the outer end in the longitudinal direction X thereof. In this case, the core-surrounding sheet 49 and the areas where the two fiber sheets 43, 44 and the water-absorbent polymer 45 are present, which are all members constituting the lower absorbent core 42, are the core-present area A2 when viewed in the thickness direction Z.

When the length of the core existing region A2 in the longitudinal direction X existing in the fin existing region A7 is the length L4, the percentage of the ratio (L4/L1) of the length L4 to the length L1 is preferably 5% or more, more preferably 10% or more, preferably 30% or less, and still more preferably 20% or less. By forming such an arrangement relationship, both the liquid absorption retention property and the fitting property can be improved, and the liquid leakage from the back side can be effectively prevented.

The length L4 is a length along the longitudinal direction X from the longitudinal direction X inside end of the non-existing region A1 to the longitudinal direction X outside end of the core lamination region A3 (specifically, the longitudinal direction X outside end of the upper absorbent core 41) in the plan view shown in fig. 1 and in the back side portion R.

As shown in fig. 2, the core lamination area A3 is an area where at least the upper absorbent core 41 and the lower absorbent core 42 are present, and in the present embodiment, an area where all the constituent materials of the absorbent body 4 are present. That is, the core lamination area A3 is an area including the core-spun sheet 49 and the absorbent core 40 having the upper absorbent core 41 and the lower absorbent core 42, as viewed in the thickness direction Z. In the present embodiment, the core lamination area A3 is located inside the core existence area A2 in the longitudinal direction X, and the core existence area A2 and the core lamination area A3 are adjacent to each other. Except for this, the same structure of the absorber 4 as that of the core lamination area A3 is continuously formed in the crotch portion M and the abdomen-side portion F.

When the elastic members 62 are disposed on the side flaps 6, the elastic members 62 are preferably disposed on the back side portion R of the diaper 1 so that the positions of the elastic members 62 and the positions of the absorbent body 4 are in a predetermined relationship.

Specifically, when the absorbent main body 5 in the back side portion R of the diaper 1 is viewed in the longitudinal direction X, the core lamination region A3, and the core presence region A2, are preferably present in the elastic member presence region, which is a region overlapping the region in the longitudinal direction in which the elastic members 62 are present in the side flap portion 6 on the absorbent main body 5. In the present embodiment, in a part of the longitudinal direction X in the region where the elastic member 62 exists, both the core existence region A2 and the core lamination region A3 exist. In the elastic member existing region, the non-existing region A1 may be present as in the present embodiment, or the non-existing region A1 may be absent.

The "elastic member existing region" is a region located on the absorbent main body between a virtual straight line R5 and a virtual straight line R6 when the side flaps 6, 6 are seen in a plan view shown in fig. 1 and in the back side portion R, and is denoted by reference numeral A8, the virtual straight line R5 is a virtual straight line connecting the elastic members 62 located outermost in the longitudinal direction X among the plurality of elastic members 62, and the virtual straight line R6 is a virtual straight line connecting the elastic members 62 located innermost in the longitudinal direction X among the plurality of elastic members 62. The elastic member existing region A8 in the present embodiment exists in a partial region in the longitudinal direction X within the flap existing region A7.

By providing the core-present region A2 and the core-laminated region A3 in the elastic member-present region A8, the back-side portion R is configured to have a low rigidity, and a gap is less likely to be formed between the back of the wearer and the diaper 1 by the stretchability of the elastic member. As a result, the fitting property can be improved, and particularly, leakage of liquid from the back side can be prevented.

In addition, when the elastic member 62 located on the outermost side in the longitudinal direction X or the elastic member 62 located on the innermost side in the longitudinal direction X among the plurality of elastic members 62 arranged on the side flap 6 is not parallel to the lateral direction Y, the elastic member existence region A8 is defined as follows. That is, when the intersection point between the fixed end portion of the plurality of elastic members 62 located on the inner side of the lateral direction Y of the elastic member 62 located on the outermost side in the longitudinal direction X and the outer end of the side flap 6 in the longitudinal direction X is PD1, and the intersection point between the fixed end portion of the elastic member 62 located on the inner side of the lateral direction Y and the inner end of the side flap 6 in the longitudinal direction X is PD2, the region on the absorbent body located between the intersection point PD1 and the intersection point PD2 is the elastic member existence region A8.

When the length of the elastic member existing region A8 along the longitudinal direction X is set to be the length L5 and the length of the core laminated region A3 existing in the elastic member existing region A8 along the longitudinal direction X is set to be the length L6, the percentage of the length L6 to the ratio (L6/L5) of the length L5 is preferably 30% or more, more preferably 50% or more, preferably 95% or less, and still more preferably 90% or less. By adopting such an arrangement relationship, the adhesion can be further improved, and leakage from the back side can be effectively prevented. Further, when the elastic member 62 located on the outermost side in the longitudinal direction X or the elastic member 62 located on the innermost side in the longitudinal direction X among the plurality of elastic members 62 disposed on the side flap 6 is not parallel to the lateral direction Y, the length L5 is the distance from the intersection PD1 to the intersection PD 2.

When the length of the core-existing region A2 in the longitudinal direction X in the elastic member-existing region A8 is the length L7, the percentage of the ratio (L7/L5) of the length L7 to the length L5 is preferably 5% or more, more preferably 10% or more, preferably 35% or less, and still more preferably 25% or less. By adopting such an arrangement relationship, the adhesion can be further improved, and leakage from the back side can be effectively prevented.

The length L5 is a length along the longitudinal direction X between the virtual straight line R5 and the virtual straight line R6 in the back side portion R in the plan view shown in fig. 1.

The length L6 is a length along the longitudinal direction X from the virtual straight line R6 to a position of the longitudinal direction X outer side end of the upper layer absorbent core 41 in the back side portion R of the absorber 4 in the plan view shown in fig. 1 and in the back side portion R.

The length L7 is a length along the longitudinal direction X from a position of the longitudinal direction X outside end of the upper layer absorbent core 41 in the back side portion R to a position of the longitudinal direction X outside end of the lower layer absorbent core 42 in the back side portion R in the plan view shown in fig. 1 and in the back side portion R of the absorbent body 4.

The diaper 1 is preferably disposed on the back side portion R such that the position of the fastener tape 7 and the position of the absorbent body 4 are in a predetermined relationship.

In detail, when the absorbent body 5 in the back side portion R of the diaper 1 is viewed in the longitudinal direction X, it is preferable that the end portion in the longitudinal direction X of the absorbent body 4 is present in a region overlapping the fastener tape 7 in the longitudinal direction, that is, in a tape presence region, on the absorbent body 5. In addition, it is preferable that the core lamination area A3 is present in the tape presence area. In the present embodiment, the end portion of the core lamination area A3 in the longitudinal direction X exists in a part of the belt existence area in the longitudinal direction X. In addition, the non-existing region A1 does not exist in the region where the fastener tape 7 exists.

The "belt-present region" is a region on the absorbent body located between an imaginary straight line R8 connecting the longitudinal direction X outer ends of the respective fastener tapes 7, 7 and an imaginary straight line R9 connecting the longitudinal direction X inner ends of the respective fastener tapes 7, 7 in the plan view shown in fig. 1 and in the back side portion R, and is denoted by reference numeral A9. The belt presence area A9 in the present embodiment is present in a part of the longitudinal direction X in the flap presence area A7, and is present in a part of the longitudinal direction X in the elastic member presence area A8.

By providing the belt presence region A9 with the end portion in the longitudinal direction X of the core lamination region A3, the region of the belt presence region A9 along the lateral direction Y can be brought into contact with the back of the wearer without being loosened during wearing of the diaper, and a gap is less likely to be formed between the back of the wearer and the diaper 1. As a result, the adhesion can be improved, and particularly, leakage from the back side can be more effectively prevented.

In addition, in the case where the longitudinal direction X outside end or the longitudinal direction X inside end of the fastener tape 7 is not parallel to the lateral direction Y, the tape existing region A9 is defined as follows. That is, when the intersection point of the lateral direction Y outside end of the member fixed to the lateral direction Y inside end of the fastener tape 7 and the longitudinal direction X outside end of the fastener tape 7 is defined as PT1 and the intersection point of the lateral direction Y outside end of the member and the longitudinal direction X inside end of the fastener tape 7 is defined as PT2, the region on the absorbent body located between the intersection point PT1 and the intersection point PT2 is the tape existing region A9.

When the length of the tape existing region A9 along the longitudinal direction X is set to be the length L8, and the length of the core lamination region A3 existing in the tape existing region A9 along the longitudinal direction X is set to be the length L9, the percentage of the length L9 to the ratio (L9/L8) of the length L8 is preferably 10% or more, more preferably 20% or more, preferably 90% or less, and still more preferably 85% or less. By virtue of such arrangement, both of the liquid absorption retention property and the fitting property can be improved, and leakage of liquid from the back side can be effectively prevented. In addition, when the longitudinal direction X outside end or the longitudinal direction X inside end of the fastener tape 7 is not parallel to the transverse direction Y, the length L8 is the distance from the intersection PT1 to the intersection PT 2.

The length L8 is a length along the longitudinal direction X between an imaginary straight line R8 connecting the longitudinal direction X outer ends of the respective fastener tapes 7, 7 to each other and an imaginary straight line R9 connecting the longitudinal direction X inner ends of the respective fastener tapes 7, 7 to each other in the back side portion R in the plan view shown in fig. 1.

The length L9 is a length in the longitudinal direction X from an imaginary straight line R9 connecting the inner ends of the respective fastener tapes 7, 7 in the longitudinal direction X to each other in the back side portion R in the plan view shown in fig. 1 to a position of the outer end of the upper absorbent core 41 in the longitudinal direction X in the back side portion R of the absorbent body 4.

In addition, it is preferable that not only the core lamination area A3 but also the core existence area A2 be located within the tape existence area A9 when the absorbent main body 5 of the back side portion R of the diaper 1 is viewed in the longitudinal direction X. Since the core-existing region A2 has fewer components and lower rigidity than the core-laminated region A3, the diaper 1 is easy to follow the skin surface of the wearer of the diaper 1, and the fitting property can be improved, and particularly, leakage of liquid from the back side can be more effectively prevented.

When the length of the core-existing region A2 in the longitudinal direction X existing in the tape-existing region A9 is set to be the length La, the percentage of the length La to the ratio of the length L8 (La/L8) is preferably 5% or more, more preferably 10% or more, preferably 80% or less, and still more preferably 70% or less. By virtue of such arrangement, both of the liquid absorption retention property and the fitting property can be improved, and leakage of liquid from the back side can be effectively prevented.

The length La is a length along the longitudinal direction X from an imaginary straight line R8 connecting the longitudinal direction X outer ends of the respective fastener tapes 7, 7 to each other in the back side portion R in a plan view shown in fig. 1 to a position of the longitudinal direction X outer end of the upper layer absorbent core 41 in the back side portion R of the absorbent body 4.

Fig. 5 and 6 show another embodiment of the absorbent article of the present invention. In the following description, components different from those of the embodiment shown in fig. 1 to 4 are mainly described, and the same reference numerals are given to the same components, and the description thereof is omitted. The constituent parts not specifically described are appropriately applied to the description of the above embodiments, and any of the structures may be used alone or in combination.

The structure of the absorber 4 of the developed disposable diaper (diaper 1) as one embodiment of the absorbent article shown in fig. 5 and 6 is different from the above-described embodiment.

In detail, it is preferable that the flap existing region A7 (region of the absorbent body 5 overlapping the side flap 6 in the longitudinal direction) has a sheet existing region A4 where the sheet including the core-surrounding sheet 49 exists between the non-existing region A1 and the core existing region A2 when the absorbent body 5 in the back side portion R of the diaper 1 is viewed from the outside in the longitudinal direction X to the inside in the longitudinal direction X.

That is, it is preferable that the non-existing region A1, the sheet-existing region A4, the core-existing region A2, and the core-laminated region A3 are formed in this order when the absorbent main body 5 of the back side portion R is viewed from the outside in the longitudinal direction X to the inside in the longitudinal direction X.

In the embodiment shown in fig. 5, the non-existing region A1 is disposed adjacent to the sheet-existing region A4, the sheet-existing region A4 is disposed adjacent to the core-existing region A2, and the core-existing region A2 is disposed adjacent to the core-laminated region A3. Further, the sheet existing region A4 exists in a partial region in the longitudinal direction X within the flap existing region A7.

By such a configuration, the absorbent main body 5 in the region where the side flap 6 is present has a structure in which the constituent members gradually decrease from the inside to the outside in the longitudinal direction X, and therefore, the region where the side flap 6 is present tends to gradually become a site where the rigidity decreases. As a result, the diaper 1 can be effectively attached along the back of the wearer, and leakage of liquid from the back side can be more effectively prevented.

The sheet-existing region A4 is a region where only the sheet exists among the constituent members of the absorber 4. In addition to the presence of at least the core wrap 49 in the sheet presence area A4, a fibrous sheet material as a constituent material of the absorbent core may be present.

In the embodiment shown in fig. 6, when focusing attention on the lower absorbent core 42 in the form of an absorbent sheet, the sheet-existing region A4 is a region formed such that both the same or different fiber sheets 43, 44 exist and particles of the water-absorbent polymer 45 are substantially absent. Instead of this structure, only one of the two fiber sheets 43 and 44 may be present. In the present embodiment, the water-absorbent polymer 45 constituting the upper absorbent core 41 and the lower absorbent core 42 is not present in the sheet-present region A4. The outer surfaces of the two fiber sheets 43, 44 are covered with a core wrap 49.

The above-mentioned "the particles of the water-absorbent polymer 45 are substantially absent" includes the following two cases: (i) The case where both the fibrous sheets 43, 44 are present and the particles of the water-absorbent polymer 45 are not present at all; and (ii) the presence of both fibrous sheets 43, 44, and the unexpected presence of particles of the water-absorbent polymer 45 at a grammage of 30g/m ² or less. Therefore, the boundary between the sheet existing region A4 and the core existing region A2 can be defined as: the boundary between the region where the fiber sheets 43, 44 exist and the particles of the water-absorbent polymer 45 exist at a gram weight exceeding 30g/m ² and the region where the fiber sheets 43, 44 exist and the particles of the water-absorbent polymer 45 exist at a gram weight of 30g/m ² or less.

As described above, when an absorbent sheet is used as the lower absorbent core 42, in order to form a form in which the two fibrous sheets 43 and 44 and the core wrap 49 are present in the sheet presence area A4, for example, a polymer non-presence area, which is an area where the water-absorbent polymer 45 is not present between the two fibrous sheets 43 and 44, may be formed in the end area of the absorbent sheet as the lower absorbent core 42 in the longitudinal direction X.

The polymer non-existing region may be formed at least in the end region of the absorbent sheet located on the back side portion R side of the diaper 1 in the longitudinal direction X, or may be formed further in the end region of the other side portion (the abdomen side portion F) in the longitudinal direction Y or in the end region in the lateral direction Y.

By forming the polymer non-existing region, the water-absorbent polymer 45 can be prevented from falling out of the absorbent sheet, and the liquid absorption retention property as the absorbent body 4 can be further improved.

When the length of the sheet existing region A4 in the longitudinal direction X existing in the flap existing region A7 is the length Le, the percentage of the length Le to the ratio of the length L1 (Le/L1) is preferably 5% or more, more preferably 10% or more, preferably 30% or less, and still more preferably 25% or less. By virtue of such arrangement, both of the liquid absorption retention property and the fitting property can be improved, and leakage of liquid from the back side can be effectively prevented.

The length Le is a length along the longitudinal direction X from a position closest to the outer side end of the longitudinal direction X among the positions where the constituent members of the absorber 4 exist to a position of the core-existing region A2 in the plan view shown in fig. 5 and in the back side portion R.

Regarding the thickness (length along the thickness direction Z) of each of the non-existing region A1, the sheet-existing region A4, the core-existing region A2, and the core-laminated region A3, it is preferable that the thickness of each region is configured to become thicker in the order of the non-existing region A1, the sheet-existing region A4, the core-existing region A2, and the core-laminated region A3. By forming such a structure to be thinner as going to the outside in the longitudinal direction X, the back side portion R of the diaper 1 is easy to follow the back of the wearer, and the fitting property can be improved, and leakage of liquid from the back side can be effectively prevented.

The thickness H1 of the non-existing region A1 is preferably 1mm or more, more preferably 2mm or more, preferably 8mm or less, more preferably 6mm or less.

The thickness H4 of the sheet-existing region A4 is preferably 1.5mm or more, more preferably 2.5mm or more, preferably 8.5mm or less, more preferably 6.5mm or less.

The thickness H2 of the core-existing region A2 is preferably 2mm or more, more preferably 3mm or more, preferably 9mm or less, more preferably 7mm or less.

The thickness H3 of the core lamination area A3 is preferably 5mm or more, more preferably 6mm or more, preferably 12mm or less, more preferably 10mm or less.

These thicknesses were each measured under no load by observing the cross section under magnification using a microscope (digital microscope VHX-1000 manufactured by KEYENCE). The ranges of the thicknesses H1, H2, and H3 and the measurement method can be suitably applied to the embodiment shown in fig. 1. In order to suppress the influence of fuzzing on the thickness, measurement may be performed in a state where a low load of 0.05kPa is applied, or a laser displacement meter may be used instead of image observation.

The length L1 of the flap existing region A7 along the longitudinal direction X can be changed as appropriate according to the shape of the intended diaper 1 and the shape of the side flap 6, and is preferably 50mm or more, more preferably 75mm or more, preferably 150mm or less, and still more preferably 120mm or less.

The length L2 of the core lamination area A3 in the longitudinal direction X existing in the flap existing area A7 may be appropriately changed according to the form of the targeted diaper 1, and is preferably 30mm or more, more preferably 35mm or more, preferably 120mm or less, more preferably 100mm or less.

The length L3 along the longitudinal direction X of the non-existing region A1 existing in the flap existing region A7 can be appropriately changed according to the form of the diaper 1to be targeted, but is preferably 1mm or more, more preferably 2mm or more, preferably 15mm or less, more preferably 10mm or less.

The length L4 of the core presence region A2 in the longitudinal direction X in the flap presence region A7 can be appropriately changed according to the form of the diaper 1to be targeted, but is preferably 2mm or more, more preferably 3mm or more, preferably 80mm or less, more preferably 75mm or less.

The length L5 of the elastic member-existing region A8 in the longitudinal direction X can be changed as appropriate according to the form of the intended diaper 1, and is preferably 45mm or more, more preferably 70mm or more, preferably 140mm or less, more preferably 110mm or less.

The length L6 of the core lamination area A3 in the elastic member existing area A8 along the longitudinal direction X can be appropriately changed according to the form of the diaper 1 to be targeted, but is preferably 30mm or more, more preferably 35mm or more, preferably 120mm or less, more preferably 100mm or less.

The length L7 of the core presence region A2 in the elastic member presence region A8 along the longitudinal direction X can be appropriately changed according to the form of the diaper 1 to be targeted, but is preferably 2mm or more, more preferably 3mm or more, preferably 80mm or less, more preferably 75mm or less.

The length L8 of the tape existing region A9 along the longitudinal direction X can be changed as appropriate according to the form of the targeted diaper 1, and is preferably 20mm or more, more preferably 25mm or more, preferably 50mm or less, more preferably 40mm or less.

The length L9 of the core lamination area A3 in the tape storage area A9 along the longitudinal direction X can be changed as appropriate according to the intended form of the diaper 1, and is preferably 20mm or more, more preferably 25mm or more, preferably 45mm or less, and more preferably 35mm or less.

The length La of the core presence region A2 in the longitudinal direction X in the tape presence region A9 can be appropriately changed according to the form of the targeted diaper 1, and is preferably 1mm or more, more preferably 2mm or more, preferably 40mm or less, and more preferably 35mm or less.

The length Le of the sheet-existing region A4 along the longitudinal direction X can be changed as appropriate according to the form of the targeted diaper 1, and is preferably 2mm or more, more preferably 5mm or more, preferably 30mm or less, more preferably 20mm or less.

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

For example, elastic members may be disposed so as to extend in the longitudinal direction X through the crotch portion M on both lateral sides of the lateral outer side of the absorbent main body 5, and leg gathers may be formed on both lateral sides of the longitudinal direction X of the diaper 1.

For example, the upper absorbent core 41 may be disposed in a state in which both side edges in the lateral direction Y and side edges in the longitudinal direction X in the abdominal side portion F are different from each other, for example, by making the lateral length thereof smaller than that of the lower absorbent core 42.

Further, in order to improve the fit of the back side portion R, the top absorbent core 41 may be formed in a spoon shape having a narrow back side portion width and a wide abdomen side portion width. In order to improve the fit of the crotch portion M, the top absorbent core 41 may have an hourglass shape with a narrowed central portion in plan view. In order to improve the liquid absorption rate and the fit, through holes and compressed portions may be formed in the upper absorbent core 41.

In the above embodiment, the side fastening portion 8 is configured to include the side flap 6 and the fastener tape 7, but the side fastening portion 8 may be configured only by the fastener tape 7 instead of this configuration. In this case, the fastener tape 7 can be fixed to the absorbent body 5 so as to extend outward in the lateral direction Y from both side edge portions 5S, 5S of the absorbent body 5 in the longitudinal direction X in the back side portion R of the diaper 1.

The following absorbent articles are further disclosed with respect to the embodiments of the present invention described above.

<1>

An absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a transverse direction orthogonal to the longitudinal direction, the absorbent article having a crotch portion disposed in the crotch of the wearer, a side portion disposed on the abdomen side of the wearer from the crotch portion, and a side portion disposed on the back side of the wearer from the crotch portion,

The absorbent article has an absorbent body comprising an absorber,

The absorbent body comprises a core-in-package sheet and an absorbent core,

The absorbent core has an upper absorbent core located on the skin-facing side and a lower absorbent core located on the non-skin-facing side,

The absorbent article has a pair of fastening portions extending laterally outward from both side edge portions in the back side portion along both side edge portions in the longitudinal direction of the absorbent main body,

Each of the fixing portions has fastener tapes extending laterally outward at both side edge portions of the fixing portion,

The longitudinal end portion of the absorbent core is located in a belt-existing region on the absorbent body as a region overlapping the fastener belt in the longitudinal direction when the absorbent body is seen from the longitudinal outside to the longitudinal inside along a longitudinal center line extending in the longitudinal direction bisecting the absorbent body in the transverse direction in a plan view.

<2>

The absorbent article according to the above < 1 >, wherein,

The upper layer absorbent core is formed by mixing and accumulating water-absorbing fibers and water-absorbing polymers.

<3>

The absorbent article of < 1> or <2 > above, wherein,

The underlying absorbent core is formed by forming a layer of water-absorbent polymer between 2 fibrous sheets.

<4>

The absorbent article according to any one of <1 > to < 3 > above, wherein,

The length L8 of the belt-existing region in the longitudinal direction is 20mm or more, preferably 25mm or more, and 50mm or less, preferably 40mm or less.

<5>

The absorbent article according to any one of <1 > to < 4> above, wherein,

When the absorbent main body is seen in the longitudinal direction, at least a portion of the core-existing region where the upper absorbent core is absent and where the lower absorbent core is present is located in the belt-existing region.

<6>

The absorbent article according to the above < 5 >, wherein,

The length of the belt presence area in the longitudinal direction is set to be a length L8, and

When the length in the longitudinal direction of the core-existing region existing in the tape-existing region is set to be a length La,

The percentage of the length La to the ratio of the length L8 (La/L8) is 5% or more, preferably 10% or more and 80% or less, preferably 70% or less.

<7>

The absorbent article of < 5 > or < 6 > above, wherein,

The length La of the core-existing region in the tape-existing region in the longitudinal direction is 1mm or more, preferably 2mm or more, and 40mm or less, preferably 35mm or less.

<8>

The absorbent article according to any one of <1 > to < 7 > above, wherein,

Each of the fixing portions includes a side sheet.

<9>

The absorbent article according to the above < 8 >, wherein,

When the absorbent main body is seen from the longitudinal outside to the longitudinal inside along a longitudinal center line extending in the longitudinal direction so as to bisect the absorbent main body in the transverse direction in a plan view, in a region where the flap is present as a region overlapping the side flap in the longitudinal direction on the absorbent main body, the following are sequentially arranged:

A non-existing region where the absorber does not exist;

a core presence region where the upper absorbent core is absent and the lower absorbent core is present; and

There is a core lamination area of the upper absorbent core and the lower absorbent core.

<10>

The absorbent article as in < 9 > above, wherein,

The length of the belt presence area in the longitudinal direction is set to a length L8,

When the length in the longitudinal direction of the core lamination area existing in the tape existing area is set to a length L9,

The percentage of the length L9 to the ratio of the length L8 (L9/L8) is 10% or more, preferably 20% or more and 90% or less, preferably 85% or less.

<11>

The absorbent article of < 9 > or < 10 > described above, wherein,

The length L9 of the core lamination region in the tape-existing region in the longitudinal direction is 20mm or more, preferably 25mm or more and 45mm or less, preferably 35mm or less.

<12>

The absorbent article according to any one of < 9 > to < 11 > above, wherein,

When the absorbent body is viewed from the longitudinal outside to the longitudinal inside along the longitudinal center line, a sheet-existing region in which the sheet including the core-wrapped sheet is present is also arranged between the non-existing region and the core-existing region.

<13>

The absorbent article as in < 12 > above, wherein,

The length of the tab presence area in the longitudinal direction is set to a length L1,

When the length in the longitudinal direction of the sheet existing region existing in the flap existing region is set to be the length Le,

The percentage of the length Le to the ratio of the length L1 (Le/L1) is 5% or more, preferably 10% or more, and 30% or less, preferably 25% or less.

<14>

The absorbent article as defined in < 12 > or < 13 > above, wherein,

The thickness H4 of the sheet-existing region is 1.5mm or more, preferably 2.5mm or more, and 8.5mm or less, preferably 6.5mm or less.

<15>

The absorbent article according to any one of < 12 > to < 14 > above, wherein,

The length Le of the sheet-existing region in the longitudinal direction is 2mm or more, preferably 5mm or more, and 30mm or less, preferably 20mm or less.

<16>

The absorbent article according to any one of < 12 > to < 15 > above, wherein,

The lower absorbent core has a polymer non-existing region where no water-absorbent polymer exists between two fibrous sheets at the longitudinal end regions thereof,

The core-spun sheet and the fiber sheet located in the non-polymer-present region are disposed in the sheet-present region.

<17>

The absorbent article according to any one of < 9 > to < 16 > above, wherein,

In the flap-existing region, when the absorbent main body is viewed from the longitudinal outside to the longitudinal inside along the longitudinal center line, the absorbent main body is sequentially provided with:

A non-existing region where the absorber does not exist;

A sheet presence area where a sheet including the chipped sheet is present;

A core laminate region of the upper absorbent core and the lower absorbent core is present,

The thickness of each region becomes thicker in the order of the non-existing region, the sheet-existing region, the core-existing region, and the core-laminated region.

<18>

The absorbent article according to any one of < 8 > to < 17 > above, wherein,

Each of the side flaps has a plurality of elastic members extending in the lateral direction and arranged at intervals in the longitudinal direction.

<19>

The absorbent article as in < 18 > above, wherein,

The length in the longitudinal direction of the region overlapping in the longitudinal direction with the region in which the elastic member is present in the side panel, i.e., the elastic member-present region, on the absorbent main body is set to a length L5,

When the length in the longitudinal direction of the core lamination area existing in the elastic member existing area is set to a length L6,

The percentage of the length L6 to the ratio of the length L5 (L6/L5) is 30% or more, preferably 50% or more and 95% or less, preferably 90% or less.

<20>

The absorbent article as in < 19 > above, wherein,

The length of the elastic member existing region in the longitudinal direction is set to a length L5,

When the length in the longitudinal direction of the core-existing region existing in the elastic member-existing region is set to a length L7,

The percentage of the length L7 to the ratio of the length L5 (L7/L5) is 5% or more, preferably 10% or more and 35% or less, preferably 25% or less.

<21>

The absorbent article according to the above < 19 > or < 20 >, wherein,

The length L5 of the elastic member-existing region in the longitudinal direction is 45mm or more, preferably 70mm or more and 140mm or less, preferably 110mm or less.

<22>

The absorbent article according to any one of < 19 > to < 21 > above, wherein,

The length L6 of the core lamination region in the elastic member-existing region in the longitudinal direction is 30mm or more, preferably 35mm or more, and 120mm or less, preferably 100mm or less.

<23>

The absorbent article according to any one of < 19 > to < 22 > above,

The length L7 of the core-existing region in the elastic member-existing region in the longitudinal direction is 2mm or more, preferably 3mm or more, and 80mm or less, preferably 75mm or less.

<24>

The absorbent article according to any one of < 9 > to < 23 > above, wherein,

Each of the side flaps has a plurality of elastic members extending in the lateral direction and arranged at intervals in the longitudinal direction,

The core lamination region and the core presence region are located in an elastic member presence region, which is a region of the absorbent body that overlaps in the longitudinal direction with a region in which the elastic member is present in the side flap, when the absorbent body is seen from the longitudinal outside toward the longitudinal inside along the longitudinal center line.

<25>

The absorbent article according to any one of < 9 > to < 24 > above, wherein,

When the length in the longitudinal direction of the longitudinal end regions of the absorbent body existing in the tab existing region is set to a length L2,

The percentage of the length L2 to the ratio of the length L1 (L2/L1) is 30% or more, preferably 50% or more and 90% or less, preferably 85% or less.

<26>

The absorbent article according to any one of < 9 > to < 25 > above, wherein,

When the length in the longitudinal direction of the non-existing region existing in the airfoil-existing region is set to be a length L3,

The percentage of the length L3 to the ratio of the length L1 (L3/L1) is 0% or more, preferably 2% or more and 25% or less, preferably 10% or less.

<27>

The absorbent article according to any one of < 9 > to < 26 > above, wherein,

When the length in the longitudinal direction of the core existence region existing in the tab existence region is set to a length L4,

The percentage of the length L4 to the ratio of the length L1 (L4/L1) is 5% or more, preferably 10% or more and 30% or less, preferably 20% or less.

<28>

The absorbent article according to any one of < 9 > to < 27 > above, wherein,

The thickness H1 of the non-existing region is 1mm or more, preferably 2mm or more, and 8mm or less, preferably 6mm or less.

<29>

The absorbent article according to any one of < 9 > to < 28 > above, wherein,

The thickness H2 of the core-existing region is 2mm or more, preferably 3mm or more, and 9mm or less, preferably 7mm or less.

<30>

The absorbent article according to any one of < 9 > to < 29 > above, wherein,

The thickness H3 of the core lamination region is 5mm or more, preferably 6mm or more, and 12mm or less, preferably 10mm or less.

<31>

The absorbent article according to any one of < 9 > to < 30 > above, wherein,

The length L1 of the tab presence area in the longitudinal direction is 50mm or more, preferably 75mm or more and 150mm or less, preferably 120mm or less.

<32>

The absorbent article according to any one of < 9 > to < 31 > above,

The length L2 of the core lamination region in the longitudinal direction in the tab presence region is 30mm or more, preferably 35mm or more, and 120mm or less, preferably 100mm or less.

<33>

The absorbent article according to any one of < 9 > to < 32 > above, wherein,

The length L3 in the longitudinal direction of the non-existing region existing in the airfoil-existing region is 1mm or more, preferably 2mm or more, and 15mm or less, preferably 10mm or less.

<34>

The absorbent article according to any one of < 9 > to < 33 > above, wherein,

The length L4 of the core existing region in the tab existing region in the longitudinal direction is 2mm or more, preferably 3mm or more, and 80mm or less, preferably 75mm or less.

Industrial applicability

According to the present invention, an absorbent article having high fit to the wearer and less prone to leakage from the back side can be provided.

Claims

1. An absorbent article having a longitudinal direction corresponding to a front-rear direction of a wearer and a transverse direction orthogonal to the longitudinal direction, the absorbent article having a crotch portion arranged in a crotch portion of the wearer, a side portion arranged on a side of the crotch portion closer to a wearer's abdomen and a side portion arranged on a side of the crotch closer to a wearer's back, the absorbent article characterized in that:

the absorbent article has an absorbent body comprising an absorber,

The absorbent body comprises a core-in-package sheet and an absorbent core,

2. The absorbent article of claim 1, wherein:

3. The absorbent article of claim 1 or 2, wherein:

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

5. The absorbent article of claim 4, wherein:

The percentage of the length La to the ratio of the length L8 (La/L8) is 5% or more and 80% or less.

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

Each of the fixing portions includes a side sheet.

7. The absorbent article of claim 6, wherein:

A non-existing region where the absorber does not exist;

8. The absorbent article of claim 7, wherein:

The percentage of the length L9 to the ratio of the length L8 (L9/L8) is 10% to 90%.

9. The absorbent article according to claim 7 or 8, characterized in that:

10. The absorbent article of claim 9, wherein:

The percentage of the length Le to the ratio of the length L1 (Le/L1) is 5% or more and 30% or less.

11. The absorbent article according to claim 9 or 10, characterized in that:

12. The absorbent article according to any one of claims 7 to 11, characterized in that:

A non-existing region where the absorber does not exist;

A sheet presence area where a sheet including the chipped sheet is present;

13. The absorbent article according to any one of claims 6 to 12, characterized in that:

14. The absorbent article of claim 13, wherein:

The percentage of the length L6 to the ratio of the length L5 (L6/L5) is 30% or more and 95% or less.

15. The absorbent article of claim 14, wherein:

The percentage of the length L7 to the ratio of the length L5 (L7/L5) is 5% or more and 35% or less.

16. The absorbent article according to any one of claims 7 to 15, wherein:

17. The absorbent article according to any one of claims 7 to 16, wherein:

The percentage of the length L2 to the ratio of the length L1 (L2/L1) is 30% to 90%.

18. The absorbent article according to any one of claims 7 to 17, wherein:

The percentage of the length L3 to the ratio of the length L1 (L3/L1) is 0% or more and 25% or less.

19. The absorbent article according to any one of claims 7 to 18, wherein:

The percentage of the length L4 to the ratio of the length L1 (L4/L1) is 5% or more and 30% or less.