CN111212622B

CN111212622B - Absorbent article

Info

Publication number: CN111212622B
Application number: CN201780095929.9A
Authority: CN
Inventors: 一万田俊明
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2021-06-08
Anticipated expiration: 2037-12-20
Also published as: JP6942817B2; JPWO2019123572A1; CN111212622A; WO2019123572A1; RU2735174C1

Abstract

An absorbent article includes a main body portion and a fastener tape. The main body portion has an absorbent main body and a wing portion. The absorbent main body has a crotch portion, and a front side portion and a back side portion which are respectively disposed on both sides in the front-back direction of the crotch portion. The wing portion has a skin-facing surface and a non-skin-facing surface, and is provided at both side edge portions in the width direction of the back side portion. The fastener tape has a flexible tape base and a fastener. The tape base material extends from the side flap portion in the width direction. The fastener is joined to the tape base material and includes a fastening surface capable of being stuck to the ventral portion. The fastening tape is configured to be bendable between a non-use position where the fastening surface is temporarily joined to the skin-facing surface and a use position where the fastening surface is peeled from the skin-facing surface. The fastener has a bent portion at least in a part of an edge portion on the crotch side, and the bent portion separates a part of the fastening surface from the skin-facing surface in the non-use position.

Description

Absorbent article

Technical Field

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

Background

A typical embodiment of a developed diaper as an absorbent article includes a diaper having an absorbent body including an absorbent core and an outer package, and a fastening member. The absorbent main body has a front side portion disposed on the front side of the wearer, a back side portion disposed on the back side of the wearer, and a crotch portion located therebetween. The fastening members are provided at both side edges of the back side portion of the absorbent main body, and have fastening tapes that are fixed to the outer surface of the front side portion when worn (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: WO2013/093677

Disclosure of Invention

An absorbent article according to one aspect of the present invention includes a main body portion and a fastener tape.

The main body portion has an absorbent main body and a wing portion.

The absorbent main body has a crotch portion, and a front side portion and a back side portion which are respectively disposed on both sides in the front-back direction of the crotch portion.

The wing portions have a skin-facing surface and a non-skin-facing surface, and are provided at both side edge portions in the width direction of the back-side portion, the side edge portions being orthogonal to the front-back direction.

The fastener tape has a flexible tape base and a fastener. The tape base material extends outward in the width direction from the wing portion. The fastener is joined to the tape base material and includes a fastening surface capable of being stuck to the ventral portion.

The fastening tape is configured to be bendable between a non-use position where the fastening surface is temporarily joined to the skin-facing surface and a use position where the fastening surface is peeled from the skin-facing surface.

The fastener has a bent portion at least in a part of an edge portion on the crotch side, the bent portion isolating a part of the fastening surface from the skin-facing surface in the non-use position.

Drawings

Fig. 1 is a plan view showing a developed state of an absorbent article according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view taken along line II-II of fig. 1.

Fig. 3 is an enlarged view of a main portion showing the form of the fastener tape on one side of the absorbent article, where (a) shows a non-use position and (B) shows a use position.

Fig. 4 is an enlarged view of a main portion including a fastener tape of an absorbent article according to a first embodiment of the present invention, where (a) is a plan view and (B) is a schematic sectional view taken along line IV-IV of (a).

Fig. 5 is a plan view of a main portion of the absorbent article showing an example of the operation of the fastener tape.

Fig. 6 (a) is a schematic view illustrating the amount of warpage of the fastener tape, and (B) is a schematic view illustrating the thickness of the fastening layer fastened to the absorbent main body of the fastener tape.

FIG. 7 is a plan view of a main portion showing another configuration example of the fastener tape.

Fig. 8 is a plan view illustrating the allowable amount of deformation of the side flap portion supporting the fastener tape, wherein (a) shows the contraction state and (B) shows the elongation state.

Fig. 9 is an enlarged view of a main portion including a fastener tape of an absorbent article according to a second embodiment of the present invention, where (a) is a plan view, and (B) is a schematic sectional view taken along line IX-IX in (a).

FIG. 10 is a schematic view illustrating the amount of warpage in the fastener tape.

Fig. 11 is a schematic sectional view of a main portion showing another configuration example of the fastener tape.

Fig. 12 is a sectional view of a main portion showing a modification of the fastening structure of the fastener tape in fig. 2.

Fig. 13 is a schematic cross-sectional view showing a modification of the fastening structure of the fastener tape shown in fig. 9 (B).

Fig. 14 is a schematic cross-sectional view showing a modification of the fastening structure of the fastener tape shown in fig. 11.

Detailed Description

The present invention relates to an absorbent article including a pair of fastener tapes for fixing a back side portion and a stomach side portion of an absorbent main body to each other.

Typically, the fastener tapes are provided on side wing portions respectively located at both widthwise side edge portions of the back side portion. The fastener tape has a flexible tape base material and a fastener (planar fastener) joined to the tape base material, and when in use, the fastener is stuck to the non-skin-facing surface of the abdominal portion, thereby fixing the dorsal portion and the abdominal portion to each other.

Before wearing (when not in use), the fastener tape is folded on the side of the side flap, and the fastening surface thereof is temporarily joined to the skin-facing surface of the side flap.

As such a fastener tape, it is required to be thinner and more flexible for the purpose of improving texture. However, if the fastener tape is made thin, the fastener tape is not easily torn from the side flap portion when the wearer wears the diaper.

The present invention relates to an absorbent article that can ensure ease of handling when worn while making a fastener tape light, thin, and flexible.

Embodiments of the present invention will be described below with reference to the drawings.

< first embodiment >

[ integral construction of Disposable diaper ]

Fig. 1 is a plan view showing a developed state of a disposable diaper 1 according to an embodiment of the present invention. The disposable diaper 1 shown in fig. 1 is in a state in which the absorbent body 10 is stretched along the XY plane. In fig. 1, the X-axis direction corresponds to the front-rear direction (longitudinal direction), and the Y-axis direction corresponds to the width direction. The disposable diaper 1 is an absorbent article for capturing excrement from an infant as a wearer without leakage.

Fig. 2 is a schematic sectional view taken along line II-II of fig. 1.

As shown in the drawings, a disposable diaper (hereinafter, simply referred to as a diaper) 1 includes a main body portion 20 having an absorbent body 10 and a pair of side flap portions 30, and a pair of fastener tapes 40. The diaper 1 is a so-called unfolding type disposable diaper.

In the following, the "inner side" and the "skin-facing side" in each configuration refer to the side and the one side which face the skin of the wearer when the diaper is worn, and the "outer side" and the "non-skin-facing side" refer to the side and the one side which face the side opposite to the skin (clothing side) of the wearer. The term "worn state" means a state in which a proper normal wearing position, that is, a proper wearing position of the absorbent article is maintained, and does not include a state in which the absorbent article is located at a position deviated from the wearing position.

The absorbent main body 10 has a crotch portion 10M, a stomach-side portion 10F, and a back-side portion 10R.

When worn, the crotch portion 10M is disposed between the crotch of the wearer, the stomach-side portion 10F is disposed on the stomach side of the wearer, and the back-side portion 10R is disposed on the back side of the wearer. The front side portion 10F and the back side portion 10R are disposed on both sides of the crotch portion 10M in the front-back direction (X-axis direction) through the crotch portion 10M. Here, the end portion side of the absorbent body 10 positioned on the abdominal side of the wearer when worn corresponds to the front side, and the end portion side of the absorbent body 10 positioned on the back side of the wearer corresponds to the back side.

The stomach portion 10F, the crotch portion 10M, and the back portion 10R correspond to respective regions when the diaper 1 is divided into approximately three equal parts in the front-back direction (X-axis direction).

The absorbent main body 10 includes an absorbent body 15, a front sheet 16, a back sheet 17, and a pair of side sheets 19.

The front sheet 16 is a liquid-permeable sheet and is disposed inside the absorber 15.

The back sheet 17 is a liquid-impermeable or water-repellent sheet and is disposed outside the absorbent body 15. The back sheet 17 constitutes an outer package of the diaper 1 in a worn state.

The side sheets 19 are disposed on the left and right sides along the front-back direction on the front sheet 16 side of the absorbent main body 10.

The absorber 15 is disposed between the front sheet 16 and the back sheet 17, and is held by the front sheet 16 and the back sheet 17.

The absorbent body 15 is configured to be able to trap excrement and absorb liquid contained in the excrement. The absorbent body 15 is formed in a belt shape long in the front-rear direction, and is disposed in a wide range from the abdomen-side portion 10F to the back-side portion 10R through the crotch portion 10M.

The absorber 15 includes an absorbent core 151 having liquid retention properties and a core-wrapped sheet 152 covering the absorbent core 151.

The absorbent core 151 has a shape elongated in the front-rear direction, and extends over substantially the entire length in the front-rear direction from the stomach-side portion 10F to the back-side portion 10R through the crotch portion 10M. The absorbent core 151 is formed by stacking (stacking) fibers of a core-forming material containing an absorbent material, and materials generally used as such a forming material can be used without particular limitation.

The core-wrapped sheet 152 wraps the entire absorbent core 151.

The front sheet 16 and the back sheet 17 each have a size larger than the absorbent body 15, extend outward in the width direction from the periphery of the absorbent body 15, and these extending portions are joined to each other by an adhesive 62. In addition to the adhesive, a known joining method such as heat sealing or ultrasonic sealing may be used.

As the front sheet 16 and the back sheet 17, various front sheets and back sheets currently used for such absorbent articles can be used without particular limitation, respectively.

For example, various nonwoven fabrics, apertured films, and the like can be used as the front sheet 16.

As the back sheet 17, a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. The back sheet 17 has, for example, a form of a liquid-impermeable film sheet alone and a form of an outer sheet laminated and arranged on the outer side of the film sheet. The outer sheet is, for example, a nonwoven fabric.

The side sheet 19 has an inner edge portion extending in the front-rear direction and an outer edge portion extending in the front-rear direction on the outer side in the width direction than the inner edge portion.

The inner edge of the side sheet 19 overlaps the absorbent body 15 and is joined to the front sheet 16 via an adhesive 61.

The outer edge portions of the side sheets 19 extend outward in the width direction from the side edges in the front-rear direction of the absorbent body 15, thereby forming side edge portions 18 in the width direction of the absorbent main body 10 including the back portion 10R. The side sheet 19 and the back sheet 17 are joined to the side sheet 30 via an adhesive 63 on the widthwise outer side of the absorber 15.

As shown in fig. 1, the filament-like elastic member 12 is disposed in an extended state on the side sheet 19 so as to pass through the crotch portion 10M and extend in the front-rear direction. The side sheet 19 in the crotch portion 10M is a portion that functions as a so-called leg portion disposed around the leg of the wearer when the diaper 1 is worn, and with this configuration, the leg gathers 13 are formed by contraction of the elastic member 12 when the diaper 1 is worn on the leg (see fig. 5).

In the present embodiment, the side sheet 30 is constituted by a member different from the absorbent main body 10. The side sheet 30 is formed of a member different from the fastener tape 40, and is joined between both side edge portions 18 of the back side portion 10R and the fastener tape 40.

One end of the side sheet 30 is joined as a fixed end 31 to the absorbent main body 10 (front sheet 16 and back sheet 17) via an adhesive 63. The side sheets 30 constitute "side wing portions" provided at both side edge portions 18 in the width direction of the back side portion 10R. In the present embodiment, the wing portions are constituted by the side pieces 30 which are different members from the back portion 10R, but the present invention is not limited thereto, and may be constituted by the same members as the back portion 10R.

The side sheet 30 is formed of an elastic sheet having stretchability in the width direction of the absorbent main body 10. In the present embodiment, the side sheet 30 includes two sheets 34 each having a rectangular shape in plan view and a plurality of linear elastic members 35, the sheets 34 respectively constitute the skin-facing surface 30a and the non-skin-facing surface 30b, and the elastic members 35 are disposed between the two sheets 34.

The plurality of elastic members 35 are disposed at the center in the width direction of the side sheet 30 at predetermined intervals in the front-rear direction. Each elastic member 35 is joined between the two sheets 34 in an extended state, and forms a fold 30s having a three-dimensional structure in the front-rear direction over the entire area of the surface of the side panel 30 in a natural state. The elastic member 35 is disposed at a position that is an extensible part that is extensible and contractible in the width direction, which is the extension direction of the elastic member 35, and the side sheet 30 is extensible and contractible in the width direction by the extensible part.

As the sheet 34 of the side sheet 30, for example, there can be used: nonwoven fabrics produced by various production methods, such as hot air nonwoven fabrics, hot roll nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and meltblown nonwoven fabrics, woven fabrics, knitted fabrics, paper, resin films, and the like, and sheet materials obtained by integrally laminating two or more of these.

[ detailed construction of fastener tape ]

Next, the detailed structure of the fastener tape 40 will be described.

The fastener tape 40 is fixed to the front end portion 32 of the side sheet 30 so as to extend outward in the width direction of the side sheet 30. In the present embodiment, the fastener 40 is disposed slightly more rearward (upward in fig. 1) than the center of the side sheet 30 in the front-rear direction.

The fastener 40 has a substantially rectangular shape with its longitudinal direction along its width direction. The fastening tape 40 includes a flexible tape base 44 and a planar fastener 45 as a fastener.

As shown in fig. 1, the tape base 44 has a substantially rectangular shape that is long in the width direction (Y-axis direction) in plan view, and the outer shape of the fastener tape 40 matches the outer shape of the tape base 44. The tape base 44 has a fixed end 41 and a tongue portion 47, wherein the fixed end 41 is fixed to the non-skin-facing surface 30b of the side sheet 30; the tongue portion 47 is located at the free end 42 opposite to the fixed end 41 in the width direction (Y-axis direction) via the planar fastener 45. The fixed end 41 is fixed to the outer surface of the front end portion 32 of the side sheet 30 by an adhesive 64. However, the present invention is not limited to this, and a known bonding method other than an adhesive may be used.

The fixed end 41 of the tape base 44 is not limited to the case of being fixed to the non-skin-facing surface 30b of the side sheet 30, and may be fixed between the skin-facing surface 30a and the non-skin-facing surface 30b of the side sheet 30. In this case, as schematically shown in fig. 12, the fixed end 41 of the tape base 44 is sandwiched between one sheet 34 constituting the skin-facing surface 30a of the side sheet 30 and the other sheet 34 constituting the non-skin-facing surface 30b of the side sheet 30 via an adhesive or the like.

The planar fastener 45 is joined to the inner surface (skin-facing surface) of the tape base 44. The planar fastener 45 has a rectangular shape in plan view, and is disposed in the widthwise central portion of the tape base 44 over the entire front-rear direction of the tape base 44. That is, the planar fastener 45 is disposed with a gap between the fixed end 41 and the free end 42 of the tape base 44.

The planar fastener 45 is not located at the free end 42 of the fastener tape 40, and the free end 42 is formed by a portion of the tape base 44. The free end 42 forms a tongue 47 for the operator to grasp with the fingers during the fastening operation.

The fastener tape 40 is configured to be fastened to the outside (non-skin-facing surface) of the abdomen-side portion 10F of the absorbent main body 10 when worn. The fastener tape 40 is fastened to the outside of the abdomen portion 10F, thereby forming the pants-shaped diaper 1 having a waist opening and leg openings.

As the tape base 44 constituting the fastener tape 40, for example, a nonwoven fabric having flexibility, a laminate of a nonwoven fabric and a resin film, or the like can be used. In the present embodiment, a non-stretchable nonwoven fabric having flexibility is used as the tape base material 44.

The surface fastener 45 has a fastening surface 45s, and the fastening surface 45s has a hook portion constituting a male surface member of the mechanical surface fastener arranged in a plane. In the planar fastener 45, the surface opposite to the fastening surface 45s is joined to the tape base 44 with an adhesive or the like.

On the other hand, a fastened region 11 (see fig. 1) is formed on the outer side (non-skin-facing surface) of the stomach-side portion 10F, and a loop portion constituting a female member of the mechanical planar fastener is arranged in the surface of the fastened region 11. The fastening region 11 detachably fastens the planar fastener 45 (fastening surface 45s) of the fastening tape 40.

Fig. 3 is an enlarged view of a main portion showing the form of the fastener tape 40 on one side (the right side in fig. 1). The fastener 40 on one side will be described below, and the same applies to the fastener 40 on the other side.

The fastening tape 40 is configured to be foldable between a non-use position at which the fastening surface 45s of the planar fastener 45 is temporarily joined to the skin-facing surface 30a of the side sheet 30 as shown in fig. 3 (a) and a use position at which the fastening surface 45s is peeled from the skin-facing surface 30a as shown in fig. 3 (B).

Fig. 4 is an enlarged view of a main portion including the fastener tape 40 in a non-use position, (a) is a plan view, and (B) is a schematic sectional view taken along line IV-IV in (a).

In the fastener 40 of the present embodiment, the planar fastener 45 has the bent portions 40w at least in part of the two edge portions E11, E12 in the front-rear direction (X-axis direction), and the bent portions 40w separate a part of the fastening surface 45s from the skin-facing surface 30a of the side sheet 30 at the non-use position of the fastener 40.

More specifically, the planar fastener 45 has a shape curved about an axis parallel to the width direction (Y-axis direction) in a direction in which the fastening surface 45s side is formed to be convex. That is, as shown in fig. 4(B), the cross-sectional shape of the planar fastener 45 in the front-rear direction has a shape in which the fastening surface 45s side is warped in a convex shape, and the bent portions 40w are provided over the entire regions of both edge portions E11, E12 of the planar fastener 45.

The tape base 44 has flexibility, and therefore has a curved shape corresponding to the shape of the planar fastener 45 at the joint portion with the planar fastener 45.

Thus, the edge portions E11 and E12 are lifted upward so as to be partially peeled off from the skin-facing surface 30a of the side sheet 30 and float upward, and a gap G1 of a predetermined size is formed between the edge portions E11 and E12 and the skin-facing surface 30a of the side sheet 30.

On the other hand, since the fastening surface 45s and the fastening region of the side sheet 30 are secured at the central portion in the front-rear direction (X-axis direction) of the planar fastener 45, a stable temporary joining state of the fastener tape 40 to the side sheet 30 is secured.

Here, the fastener tape 40 is folded from the side edge portion of the side sheet 30 toward the non-use position in a state where the diaper 1 is not used. In the non-use position, the fastening surface 45s of the planar fastener 45 of the fastening tape 40 is temporarily joined to the skin-facing surface 30a of the side sheet 30, thereby preventing the sheet from being unintentionally unfolded toward the use position.

The tongue portion 47 is not fastened to the side sheet 30, and in essence, when the diaper 1 is used, the user's fingers pinch the tongue portion 47 and tear the planar fastener 45 from the side sheet 30.

On the other hand, many users tear the planar fastener 45 from the side sheet 30 without pinching the tongue portion 47. For example, as shown in fig. 5 (a) and (B), the thumb may be slid from the crotch portion 10M side (leg gather 13 side) toward the edge portion of the fastening tape 40 so as to rub against the skin contact surface 30a of the side sheet 30, and the edge portion of the planar fastener 45 may be hooked on the pad of the thumb to tear the planar fastener 45 from the side sheet 30. In this case, if the fastener tape is thin, the fastener tape is less likely to be caught by fingers, and the operation of tearing off the planar fastener 45 is difficult.

The fastening tape 40 of the present embodiment has the bent portion 40w as described above, and the bent portion 40w separates a part of the fastening surface 45s from the skin-facing surface 30a of the side sheet 30 at the edge portions E11 and E12 of the planar fastener 45. Therefore, when the thumb is slid on the side sheet 30 toward the fastener tape 40 as shown in fig. 5 (a) and (B), the pad of the thumb is easily caught in the gap G1 formed between the edge portion E11 of the sheet-shaped fastener 45 and the side sheet 30. This makes it easier to pinch the planar fastener 45, and ensures smooth fastening of the diaper 1.

Further, since the above-described bent portions 40w are provided on both edge portions E11 and E12 of the planar fastener 45, the index finger or middle finger of the user can be easily hooked not only on the edge portion E11 on the crotch portion 10M side but also on the edge portion E12 on the opposite side. This makes it easy to pick up the planar fastener 45 not only from the outer side (front side) but also from the back side (rear side), and therefore, it is possible to sufficiently cope with various operating methods for the user.

In addition, the fastener 40 can be formed of a thinner and more flexible material so that the fastener 40 can be easily torn from the side sheet 30. The sum of the thicknesses of the tape base 44 and the surface fastener 45 is, for example, 1.0mm or less, and more preferably 0.5mm or less.

According to the present embodiment, the fastener tape 40 can be made thin and flexible, and the workability in wearing can be ensured.

[ method for producing fastener tape ]

The method of manufacturing the fastener tape 40 having the above-described structure is not particularly limited, and an appropriate method can be employed.

Typically, the fastener tape 40 is manufactured in a roll-to-roll manner. For example, while a wide sheet-like base material constituting the tape base material 44 is moved forward in one direction (MD direction), a band-like hook portion constituting the planar fastener 45 is attached to the sheet-like base material. Then, the fastener tape 40 is manufactured by cutting in a direction (CD direction) orthogonal to the MD direction.

As a method of forming the bent portion 40w, for example, in the above bonding step, the sheet-like base material is held at a higher tension than the hook portion. Since the sheet-like base material is more greatly contracted in the width direction than the hook portion, the planar fastener 45 can be bent into a shape such that the fastening surface 45s side is warped to be convex.

Alternatively, the guide rollers may be bonded to each other on the circumferential surface thereof so that the hook portions form the outer circumferential side of the sheet-like base material. The curvature radius of the hook portion is larger than the sheet-like base material by a portion corresponding to the thickness of the sheet-like base material, and therefore, the circumferential length of the hook portion becomes longer than the circumferential length of the sheet-like base material. In this way, the planar fastener 45 can be bent into a shape such that the fastening surface 45s side is warped in a convex shape.

The adhesion of the sheet-like base material to the hook portion is not limited to the case of using an adhesive. For example, the hook portion may be directly laminated on the sheet-like base material on the guide roller in a semi-molten state at a temperature equal to or higher than the crystallization temperature thereof.

[ other constitutions ]

The fastener 40 of the present embodiment can also be configured as follows.

(form of bending part)

In the present embodiment, the bent portions 40w are provided at both edge portions E11 and E12 of the planar fastener, and the bent portions 40w may be provided only at the edge portion E11 on the crotch portion 10M side.

The magnitude of the warp of the planar fastener 45 formed by the bent portion 40w is not particularly limited as long as the gap G1 of a predetermined size or more between the edge portions E11 and E12 of the planar fastener 45 and the skin-facing surface 30a of the side sheet 30 can be formed.

Here, as schematically shown in fig. 6 (a), the amount of warpage D1 of the planar fastener 45 is defined by the maximum depth of the fastener tape 40 with reference to a virtual line L connecting the two edge portions E11 and E12. The magnitude of the warpage amount D1 is not particularly limited, but is preferably 1mm or more. This can form a gap G1 of 1mm or more.

The size of the gap G1 is not particularly limited, and may be set appropriately according to the size of the planar fastener 45, the size of the user's fingertip, or the like, and is, for example, 1mm to 5 mm. By setting the gap G1 to be 1mm or more and 5mm or less, it is possible to secure a sufficient fastening area with the side sheet 30 while securing good peeling workability of the planar fastener 45 as described above, and to obtain a necessary temporary joining strength.

The loop portion (fastening layer capable of being fastened to the fastening surface 45s) constitutes the fastened region 11 (see fig. 1) that supports the stomach portion 10F of the fastening tape 40, and the thickness of the loop portion is preferably optimized according to the form and the amount of warpage D1 of the planar fastener 45. For example, typically, the hook portion of the planar fastener 45 has a pin shape including a head portion engageable with the loop portion (see, for example, fig. 3 and 4 of japanese patent laid-open No. 2016-. In this case, as schematically shown in fig. 6 (B), the thickness T of the loop portion 110 is preferably 50% or more of the warpage amount D1 of the planar fastener 45. This allows the fastening surface 45s to enter the loop portion 110 deeply to increase the fastening region, thereby ensuring a stable fastening action between the planar fastener 45 having the bent portion 40w and the fastened region.

On the other hand, the thickness T of the loop portion 110 is not particularly limited, and is preferably 200% or less of the warpage amount D1 of the planar fastener 35, for example. This can provide a mounting feeling (pressing feeling) of the planar fastener 45 to the ring portion 110, and ensure stable attachment of the planar fastener 45 to the ring portion 110.

For measuring the thickness of the ring portion 110, a commercially available measuring instrument such as a compression tester "KES-FB 3" manufactured by KATO TECH co. In the present specification, the thickness of the ring part 110 is defined as a low pressure thickness (0.5 gf/cm)²) And a high pressure thickness (50 gf/cm)²) The difference between them.

Here, the low-pressure thickness is a thickness in a state where almost no load is applied, and the high-pressure thickness is a thickness under a pressure that an installer can sufficiently apply when attaching the fastener tape to the ring portion. Therefore, the difference between the high-pressure thickness and the low-pressure thickness is an amount by which the loop portion can be deformed in the thickness direction when the fastener tape is attached by the installer, and corresponds to an amount by which the portion of the pin (hook portion) of the planar fastener can enter the loop portion.

The magnitude of the warpage amount D1 or the gap G1 is not limited to be constant over the entire regions of the edge portions E11 and E12, and may be different for each portion.

For example, as the amount of warp D1 of the bent portion 40w, the tongue portion 47 side may be larger than the fixed end 41 side of the fastener tape 40 (the fold side of the tape base material 44 in the non-use position). This makes the gap G1 larger on the tongue portion 47 side, and therefore, the operation of pinching the planar fastener 45 is easier.

If the warpage of the planar fastener 45 is too large or the region temporarily joined to the side sheet 30 is too small, there is a possibility that the fastener tape 40 may be undesirably deformed in the manufacturing process of the diaper 1. For example, after the step of folding the fastener 40 into the non-use position or the step of temporarily joining the fastener 40 to the side sheet 30, the fastener 40 may be peeled off from the side sheet 30 and opened outward, or the planar fastener 45 may be bent from the bent portion 40 w. To eliminate such a fear, it is preferable that the amount of warp (gap G1) of the planar fastener 45 is larger on the tongue portion 47 side than on the fixed end 41 side as described above.

In the operation of pinching up the planar fastener 45 from the side sheet 30 by the methods shown in fig. 5 (a) and (B), the probability that the thumb first contacts the tongue portion 47 side of the planar fastener 45 is high in consideration of the direction of movement of the thumb. Therefore, the operation of pinching the planar fastener 45 is facilitated by increasing the amount of warp on the tongue portion 47 side.

From the same viewpoint as described above, for example, as shown in fig. 7, the fastener tape 40 may be formed such that the tape width is narrower toward the tongue portion 47. Thus, the edge portion E11 on the crotch portion 10M side (leg gather 13 side) of the fastening band 40 extends obliquely toward the grip portion 47, and the contact area between the edge portion E11 and the thumb pad is further increased, thereby facilitating the operation of gripping the planar fastener 45.

(side sheet)

As described above, the side sheet 30 of the diaper 1 is subjected to a shirring process having a three-dimensional uneven structure (fold portion 30s) with ridges in the front-rear direction (see fig. 3 (a)). Since the fold portion 30s is located in the vicinity of the distal end portion (tongue portion 47) of the fastener tape 40 in the non-use position, when the thumb is frictionally slid on the skin-facing surface 30a of the side sheet 30 as shown in fig. 5 (a), the fold portion 30s is recessed in the thickness direction and is easily caught by the edge portion E11 of the fastener tape 40.

Further, since the planar fastener 45 of the fastening tape 40 is temporarily joined to the fold portion 30s at the non-use position, the temporary joining strength to the side panel 30 is reduced as compared with the case where the fold portion 30s is not present, and the planar fastener 45 is easily torn from the side panel 30.

Preferably, the fold portion 30s is formed so that the bending rigidity about the front-rear direction (X-axis direction) of the side sheet 30 is smaller than the bending rigidity about the width direction (Y-axis direction) of the side sheet 30. Thus, since the side sheet 30 is easily bent about the front-rear direction thereof as an axis, the front end portion (tongue portion 47) side of the fastener 40 protrudes from the side sheet 30 and is easily pinched.

The form of the fold portion 30s is not particularly limited, and may be a simple wave shape or a flute structure having a hollow portion extending in the front-rear direction. In the latter case, the above-described action and effect are more remarkable, and therefore, the present invention is particularly advantageous.

In the present embodiment, the side pieces 30 are formed of elastic pieces that can be stretched in the width direction, and therefore can be flexibly stretched in accordance with various positions of the wearer, and a stable wearing sensation can be ensured. In particular, the side sheet 30 is preferably configured to be able to extend in the width direction over the entire region in the front-rear direction. This also allows the waist to conform to the variation in the waist circumference according to the body position of the wearer.

Generally, when the position of the wearer changes, local wrinkles are likely to occur in the side panels due to the change, and when an excessive load is applied in the circumferential direction of the diaper, the fastener tape is likely to be displaced from the fastened region of the abdomen portion. In order to prevent such wrinkles from occurring, it is preferable that the side sheet 30 be stretchable over the entire region in the front-rear direction as described above, so that wrinkles are less likely to occur in any body position.

As the deformation allowance in the width direction (Y-axis direction) of the side sheets 30, for example, the ratio of the maximum extension amount in the width direction of each side sheet 30 to the total length of the absorbent main body 10 along the front-rear direction (X-axis direction) is preferably 5% or more. This prevents the side sheet 30 from being wrinkled regardless of the size of the diaper 1.

On the other hand, from the viewpoint of ensuring prevention of wearing misalignment of the diaper 1, the ratio of the maximum extension of each side sheet 30 in the width direction to the entire length of the absorbent main body 10 in the front-rear direction is preferably 25% or less, for example.

Here, the maximum elongation of each side sheet 30 in the width direction is a difference between the width of the side sheet 30 when it is elongated and the width of the side sheet 30 when it is contracted (in a natural state).

In particular, in the case where the fastener 40 is disposed further to the rear side (upper side in fig. 1) than the center of the side sheet 30 in the front-rear direction as in the present embodiment, the lower limit value of the ratio of the lengths may be set to different values on the front edge portion side and the rear edge portion side of the fastener 40 as schematically shown in fig. 8 (a) and (B).

Fig. 8 a schematically shows the contraction of the side sheet 30 (natural state), and fig. 8B schematically shows the expansion of the side sheet 30. In fig. 8 (a) and (B), the distance between the foremost (lower in the drawing) end of the adhesive 63 joining the side sheet 30 and the back side portion 10R and the side sheet side corner portion of the planar fastener 45 at the front edge portion E11 of the fastener tape 40 is L11, and the distance between the rearmost (upper in the drawing) end of the adhesive 63 and the front side sheet side corner portion of the planar fastener 45 at the rear edge portion E12 of the fastener tape 40 is L12. When L11 and L12 after elongation are L11 'and L12', respectively, and the total length of the product (the length of the absorbent main body 10 in the front-rear direction) is L10, L11 'and L12' are preferably provided so as to satisfy the following expressions (1) and (2), respectively.

(L11'-L11)/L10≥7.5％…(1)

(L12'-L12)/L10≥5％…(2)

Further preferably, the side sheet 30 is provided so that the elongation (L11'-L11) of the front edge portion E11 side of the fastener tape 40 is larger than the elongation (L12' -L12) of the rear edge portion E12 side of the fastener tape 40.

Since the range of variation of the joints of the groin is large, wrinkles of the side sheet 30 due to a change in the position of the wearer tend to occur on the front edge portion E11 side of the fastener tape 40 along the periphery of the legs of the wearer. Therefore, it is preferable that the front edge portion E11 side of the fastener tape 40 has a sufficient deformation allowance of the side sheet 30 according to the movement of the foot.

On the other hand, the side sheet 30 needs to be deformable by an allowable amount to cope with a change in the waist circumference of the wearer on the rear edge E12 side of the fastener tape 40, but the side sheet is generally more likely to wrinkle due to movement of the legs than wrinkles caused by the change in the waist circumference. In addition, as the deformation allowance for the circumferential direction of the waist circumference corresponding to the change in the waist circumference, it is sufficient that both side sheets are used, but as the deformation allowance for the circumference of the leg portion, one side sheet is sufficient. Further, if the amount of extension of the side sheet 30 on the rear edge E12 side of the fastener tape 40 is inadvertently increased too much, there is a possibility that the diaper 1 may be easily displaced and dropped.

Thus, the side sheet 30 is preferably provided so that the elongation on the front edge portion E11 side of the fastener 40 (L11'-L11) is greater than the elongation on the rear edge portion E12 side of the fastener 40 (L12' -L12).

The positions of the starting points of the predetermined distances L11 and L12 are not particularly limited, and may be set at arbitrary positions. Typically, the positions of the respective starting points are set so that a virtual line connecting the two starting points on the side sheet 30 and a virtual line connecting the two starting points on the fastener tape 40 are parallel to each other.

When the side pieces 30 are formed of the same member as the back portion 10R (when the side pieces 30 are formed as side wing portions integral with the back portion 10R), the distances L11 and L12 can be defined as follows, for example.

A virtual line parallel to the longitudinal direction is drawn from a portion of the absorbent main body 10 having the smallest width as the crotch portion 10M, a distance between a point (or end portion) at the forefront on the virtual line and a side flap corner portion of the planar fastener 45 at the front edge portion E11 of the fastener 40 in the back side portion is L11, and a distance between a point (or end portion) at the rearmost on the virtual line and a side flap corner portion of the planar fastener 45 at the rear edge portion E12 of the fastener 40 in the back side portion is L12.

< second embodiment >

Next, a second embodiment of the present invention will be explained.

Hereinafter, the description will be mainly given of the structure different from the first embodiment, and the same structure as that of the first embodiment will be given the same reference numerals, and the description thereof will be omitted or simplified.

Fig. 9 is an enlarged view of a main portion including the fastener tape 50 at a non-use position of the present embodiment, where (a) is a plan view, and (B) is a schematic sectional view taken along line IX-IX in (a). The fastener 50 on one side will be described below, and the same applies to the fastener 50 on the other side.

In the present embodiment, the configuration of the fastener tape 50 is different from that of the first embodiment. The details of the fastener tape 50 will be described below.

[ detailed construction of fastener tape ]

In the fastener 50 of the present embodiment, the planar fastener 55 as a fastener has the bent portions 50w at least in part of the two edge portions E21 and E22 in the front-rear direction (X-axis direction), and the bent portions 50w separate a part of the fastening surface 55s from the skin-facing surface 30a of the side sheet 30 at the non-use position of the fastener 50.

More specifically, the planar fastener 55 has a shape curved around an axis parallel to the front-rear direction (X-axis direction) in a direction in which the fastening surface 55s side is formed in a concave shape. That is, as shown in fig. 9 (B), the cross-sectional shape of the planar fastener 55 in the width direction has a shape in which the fastening surface 55s side is warped to be concave, and the bent portions 50w are provided at the center portions in the width direction of both edge portions E21 and E22 of the planar fastener 55.

Since the tape base 44 has flexibility, a curved shape corresponding to the shape of the planar fastener 55 is provided at a joining portion with the planar fastener 55.

Thus, the edge portions E21, E22 are raised so as to be partially peeled off from the skin-facing surface 30a of the side sheet 30 and float upward, and a gap G2 of a predetermined size is formed between the edge portions E21, E22 and the skin-facing surface 30a of the side sheet 30.

On the other hand, since the fastening surface 55s and the fastening region of the side sheet 30 are secured at both end sides in the width direction (Y-axis direction) of the planar fastener 55, a stable temporary joining state of the fastener tape 50 to the side sheet 30 is secured.

The fastening tape 50 in the present embodiment has a bent portion 50w at a part of the edge portions E21 and E22, and the bent portion 50w separates a part of the fastening surface 55s from the skin-facing surface 30a of the side sheet 30. Therefore, as in the first embodiment, when the thumb is slid on the side sheet 30 toward the fastener tape 50, the pad of the thumb is easily caught in the gap G2 formed between the edge E21 of the sheet fastener 55 and the side sheet 30. This makes it easier to pinch the planar fastener 55, and ensures smooth fastening of the diaper 1.

Further, since the above-described bent portions 50w are provided on both edge portions E21 and E22 of the planar fastener 55, the index finger or middle finger of the user can be easily hooked not only on the edge portion E21 on the crotch portion 10M side but also on the edge portion E22 on the opposite side. This makes it easy to pick up not only the planar fastener 55 from the outer side (front side) but also from the back side (rear side), and therefore, it is possible to sufficiently cope with various operating methods for the user.

Further, the fastener 50 can be formed of a thinner and more flexible material so that the fastener 50 can be easily torn from the side sheet 30. The sum of the thicknesses of the tape base 44 and the surface fastener 55 is, for example, 1.0mm or less, and more preferably 0.5mm or less.

According to the present embodiment, as in the first embodiment, the fastener tape 50 can be made thin and flexible, and the ease of handling during wearing can be ensured.

[ method for producing fastener tape ]

The method of manufacturing the fastener tape 50 having the above-described structure is not particularly limited, and an appropriate method can be employed.

Typically, the fastener tape 50 is manufactured in a roll-to-roll manner. For example, a wide sheet-like base material constituting the tape base material 44 is advanced in one direction (MD direction), and the tape-like hook portion constituting the planar fastener 55 is attached to the sheet-like base material. Then, the fastener tape 40 is manufactured by cutting in a direction (CD direction) orthogonal to the MD direction.

As a method of forming the bent portion 40w, for example, in the above bonding step, a pair of rollers sandwiching the sheet-like base material and the hook portion are used. In this case, the circumferential surface of the roller facing the sheet-like base material is processed into a concave surface in advance, and the circumferential surface of the roller facing the hook portion is processed into a convex surface corresponding to the concave surface in advance. Thereby, the planar fastener 55 can be bent into a shape such that the fastening surface 55s side is warped into a concave shape.

Alternatively, when the hook portion is made of a thermoplastic resin, a change in volume according to a change in temperature can be used. For example, after the heated hook portion is bonded to the sheet-like base material, the hook portion can be contracted in a cooling step so that the free surface (hook surface) thereof is warped in a concave shape.

The adhesion of the sheet-like base material to the hook portion is not limited to the case of using an adhesive. For example, the hook portion may be heated to a semi-molten state at or above its crystallization temperature and directly laminated to the sheet-like base material on the guide roller. The heating portion of the hook portion may be only a joint surface with the sheet-like base material, or may be the entire hook portion.

[ other constitutions ]

The fastener 50 of the present embodiment can also be configured as follows.

In the present embodiment, the bent portions 50w are provided at both edge portions E21 and E22 of the planar fastener, and the bent portions 50w may be provided only at the edge portion E21 on the crotch portion 10M side.

The magnitude of the warp of the planar fastener 55 formed by the bent portion 50w is not particularly limited as long as the gap G2 of a predetermined size or more between the edge portions E21 and E22 of the planar fastener 55 and the skin-facing surface 30a of the side sheet 30 can be formed.

Here, as schematically shown in fig. 10, the amount of warp D2 of the planar fastener 55 is defined by the maximum depth of the fastener tape 40, which is based on the virtual line L connecting the two edge portions E21 and E22. The magnitude of the warpage amount D2 is not particularly limited, but is preferably 1mm or more. This can form a gap G2 of 1mm or more.

The size of the gap G2 is not particularly limited, and may be set appropriately according to the size of the planar fastener 55, the size of the user's fingertip, or the like, and is, for example, 1mm to 5 mm. By setting the gap G2 to be 1mm or more and 5mm or less, it is possible to secure a sufficient fastening area with the side sheet 30 while securing good peeling workability of the planar fastener 55 as described above, and to obtain a necessary temporary joining strength.

The thickness T (see fig. 6B) of the loop portion 110 constituting the fastened region 11 (see fig. 1) of the abdominal portion 10F of the support fastener tape 50 is preferably optimized according to the amount of warpage D2 of the planar fastener 55, as in the first embodiment. In the present embodiment, the thickness T of the loop portion 110 is preferably 50% or more of the warpage amount D2 of the planar fastener 55. Accordingly, the fastening surface 55s can enter the loop portion 110 deeply to increase the fastening region, and therefore, a stable fastening action between the planar fastener 55 having the bent portion 50w and the fastened region is ensured.

On the other hand, the thickness T of the loop portion 110 is not particularly limited, and is preferably 200% or less of the warpage amount D2 of the planar fastener 55, for example. This can provide a mounting feeling (pressing feeling) of the planar fastener 55 to the ring portion 110, and ensure stable attachment of the planar fastener 55 to the ring portion 110.

Further, the joining position of the fixed end 41 of the fastener tape 50 to the non-skin-facing surface 30b of the side sheet 30 may be set as described in fig. 11. In the example shown in the figure, the joining layer 641, which joins the fixed end 41 and the non-joining surface 30b of the side sheet 30, is selectively provided in a region facing the apex of the curved portion 50w of the planar fastener 55 in the thickness direction. This enables the gap G2 corresponding to the amount of warp of the planar fastener 55 to be stably formed between the side sheet 30 and the bent portion 50 w.

Typically, the bonding layer 641 may be formed of an adhesive, but may be formed by another bonding method such as heat sealing or ultrasonic sealing. The joining layer 641 is preferably formed to have a length corresponding to the length of the planar fastener 55 in the front-rear direction. The width of the bonding layer 641 is not particularly limited as long as it is a size that can reliably separate the region of the side sheet 30 facing the top of the bent portion 50w from the fastening surface 55 s.

The fixed end 41 of the tape base 44 is not limited to the case where it is fixed to the non-skin-facing surface 30B of the side sheet 30 as shown in fig. 9 (B) and 11, and may be fixed between the skin-facing surface 30a and the non-skin-facing surface 30B of the side sheet 30. In this case, as schematically shown in fig. 13 and 14, the fixed end 41 of the tape base 44 is bonded between the one sheet 34 constituting the skin-facing surface 30a of the side sheet 30 and the other sheet 34 constituting the non-skin-facing surface 30b of the side sheet 30 via the adhesive 64 or the bonding layer 641.

As described above, the present embodiment can also provide the same operational advantages as the first embodiment.

The configuration of the side piece 30, the allowable deformation amount thereof, and the like described in the first embodiment can be similarly applied to the present embodiment, and therefore, the description thereof is omitted. The fastener tape 50 can also be formed, for example, such that the tape width narrows toward the tongue portion 47.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications may be made.

For example, although the absorbent main body 10 and the side sheet 30 are formed as separate members in the above embodiment, the following configuration may be adopted: the fastener tape is fixed to the absorbent main body, which is formed by integrating the absorbent main body and the side sheet, as a separate member from the absorbent main body. In the form in which the absorbent main body and the side sheet are integrated, for example, the front sheet and the back sheet are configured to cover the absorbent body and extend to the region of the side sheet.

In the above embodiment, the case where the fastening members provided at both side edge portions of the back portion 10R each have a single fastener tape has been described as an example, but the present invention is not limited thereto. For example, the present invention can also be applied to a diaper having two fastener tapes arranged in the front-rear direction on each fastener member.

The absorbent article of the present invention may be a disposable diaper for adults or children, for example, instead of the disposable diaper for infants. The absorbent article of the present invention may not be a disposable diaper as long as it is a type of absorbent article to be worn on the lower body. Examples of such absorbent articles include sanitary napkins and urine-receiving pads of the spread diaper type.

With regard to the above-described embodiments, the present invention further discloses the following absorbent article.

<1> an absorbent article comprising a main body and fastener tapes,

the main body section has an absorbent main body having a crotch section, and a front side section and a back side section which are respectively disposed on both sides in the front-back direction of the crotch section; the wing portion has a skin-facing surface and a non-skin-facing surface, and is provided at both side edge portions in a width direction orthogonal to the front-rear direction of the back portion;

the fastener tape has a flexible tape base material extending from the wing portion to the outside in the width direction, and a fastener; the fastener is joined to the tape base and includes a fastening surface capable of being stuck to the abdomen portion, the fastening tape is configured to be bendable between a non-use position where the fastening surface is temporarily joined to the skin-facing surface and a use position where the fastening surface is peeled from the skin-facing surface,

the fastener has a bent portion at least in a part of an edge portion on the crotch side, and the bent portion isolates a part of the fastening surface from the skin-facing surface in the non-use position.

<2> the absorbent article according to <1> above, wherein,

the belt base material has a fixed end and a tongue portion, the fixed end being fixed to the non-skin-facing surface or between the skin-facing surface and the non-skin-facing surface; the tongue portion is located at a free end opposite to the fixed end in the width direction with the fastener interposed therebetween,

the fastening piece has a convex or concave shape formed by warping the fastening surface side.

<3> the absorbent article according to <2> above, wherein,

the cross-sectional shape of the fastener in the front-rear direction has a shape in which the fastening surface side is warped to be convex,

the bending portion is provided over the entire crotch-side edge portion of the fastener.

<4> the absorbent article according to <3> above, wherein,

the amount of warpage on the tongue side of the curved portion is greater than the amount of warpage on the fixed end side of the curved portion.

<5> the absorbent article according to <3> or <4> above, wherein,

the wing portion has a fold portion having a three-dimensional structure along the front-rear direction.

<6> the absorbent article according to <5> above, wherein,

the fastener tape is temporarily joined to the fold portion at the non-use position.

<7> the absorbent article according to <5> or <6> above, wherein,

the side wing portions have a bending rigidity with respect to the front-rear direction as an axis that is lower than a bending rigidity of the side wing portions with respect to the width direction as an axis.

<8> the absorbent article according to any one of <5> to <7>, wherein,

the fold portion has a hollow portion extending in the front-rear direction.

<9> the absorbent article according to <2> above, wherein,

the cross-sectional shape of the fastener in the width direction has a shape in which the fastening surface side is warped to be concave,

the bending portion is provided at a center portion in the width direction at an edge portion of the fastener on the crotch side.

<10> the absorbent article according to <9> above, wherein,

the tape base further includes a joining layer joining the fixed end to the non-skin-facing surface or between the skin-facing surface and the non-skin-facing surface,

the bonding layer is selectively provided in a region facing an apex of the bent portion in a thickness direction.

<11> the absorbent article according to any one of <2> to <10>, wherein,

the fastener is a planar fastener,

the ventral portion has a fastening layer capable of being fastened with the fastening surface,

the thickness of the buckling layer is more than 50% of the warping amount of the buckling piece.

<12> the absorbent article according to any one of <1> to <11>, wherein,

the sum of the thicknesses of the tape base material and the fastener is 1.0mm or less.

<13> the absorbent article according to any one of <1> to <12>, wherein,

the wing portion is formed of an elastic piece that can be extended in the width direction over the entire region in the front-rear direction.

<14> the absorbent article according to <13> above, wherein,

the ratio of the maximum extension of the side flap portion in the width direction to the total length of the absorbent main body in the front-rear direction is 5% or more.

<15> the absorbent article according to any one of <1> to <14>, wherein,

the side portions are formed of side pieces joined between the side edges of the back portion and the fastener tape.

<16> the absorbent article according to any one of <1> to <15>, wherein,

the tape base material has a curved shape matching the shape of the fastener at the joint portion with the fastener.

<17> the absorbent article according to any one of <1> to <16>, wherein,

a gap of a predetermined size is formed between the edge portion of the fastener and the skin-facing surface of the wing portion.

<18> the absorbent article according to any one of <3> to <8>, wherein,

the bent portions are provided at both edge portions of the fastener.

<19> the absorbent article according to any one of <1> to <18>, wherein,

the sum of the thicknesses of the tape base material and the fastener is more preferably 0.5mm or less.

<20> the absorbent article according to <17> above, wherein,

the size of the gap is not particularly limited, and may be set as appropriate according to the size of the fastener, the size of the user's fingertip, or the like, and is, for example, 1mm to 5 mm.

<21> the absorbent article according to any one of <1> to <20>, wherein,

the fastener tape is formed such that the tape width becomes narrower toward the tongue portion side.

<22> the absorbent article according to <14> above, wherein,

when the distance between the foremost end of the adhesive joining the side flap portion and the back portion and the side flap portion corner portion of the fastener at the front edge portion of the fastener tape is L11, the distance between the rearmost end of the adhesive and the side flap portion corner portion of the fastener at the rear edge portion of the fastener tape is L12, and L11 and L12 after elongation are L11 'and L12', respectively, and the total length of the product (the length of the absorbent body in the front-rear direction) is L10, L11 'and L12' are provided so as to satisfy the following expressions (1) and (2), respectively.

(L11'-L11)/L10≥7.5％…(1)

(L12'-L12)/L10≥5％…(2)

<23> the absorbent article according to <22> above, wherein,

the fastener is provided so that the elongation (L11'-L11) on the front edge side of the fastener is greater than the elongation (L12' -L12) on the rear edge side of the fastener.

<24> the absorbent article according to <14> above, wherein,

the ratio of the maximum extension of the side flap portion in the width direction to the total length of the absorbent main body in the front-rear direction is 25% or less.

<25> the absorbent article according to <11> above, wherein,

the thickness of the fastening layer is less than 200% of the warping amount of the fastening piece.

Industrial applicability

According to the present invention, it is possible to make the fastener tape light, thin and flexible and to ensure the ease of handling during wearing.

Claims

1. An absorbent article characterized by:

comprises a main body part and a fastener belt,

the main body section has an absorbent main body having a crotch section, and a front side section and a back side section which are respectively disposed on both sides in the front-back direction of the crotch section; the wing portion has a skin-facing surface and a non-skin-facing surface, and is provided at both side edge portions in a width direction orthogonal to the front-rear direction of the back-side portion;

the fastener tape has a flexible tape base material extending from the wing portion to the outside in the width direction, and a fastener; the fastener is joined to the tape base and includes a fastening surface in which a hook portion is disposed so as to be attachable to the abdomen portion, the fastening tape is configured to be bendable between a non-use position where the fastening surface is temporarily joined to the skin-facing surface and a use position where the fastening surface is peeled off from the skin-facing surface,

the fastening device has a bent portion at least in a part of an edge portion on the crotch side, and the bent portion isolates a part of the fastening surface from the skin-facing surface in the non-use position.

2. The absorbent article of claim 1, wherein:

the buckling piece is provided with a convex or concave shape formed by buckling the buckling surface side.

3. The absorbent article of claim 2, wherein:

the curved portion is provided over the entire edge portion on the crotch side of the fastener.

4. The absorbent article of claim 3, wherein:

a warp amount of the tongue portion side of the bent portion is larger than a warp amount of the fixed end side of the bent portion.

5. The absorbent article according to claim 3 or 4, characterized in that:

the wing portions have pleats having a three-dimensional structure along the front-rear direction.

6. The absorbent article of claim 5, wherein:

the fastener tape is temporarily joined to the pleats in the non-use position.

7. The absorbent article of claim 5, wherein:

the bending rigidity of the wing portions about the front-rear direction is lower than the bending rigidity of the wing portions about the width direction.

8. The absorbent article of claim 5, wherein:

the fold portion has a hollow portion extending in the front-rear direction.

9. The absorbent article of claim 2, wherein:

the curved portion is provided at a center portion in the width direction on an edge portion on the crotch side of the fastener.

10. The absorbent article of claim 9, wherein:

the tape base further has a joining layer joining the fixed end to the non-skin-facing surface or between the skin-facing surface and the non-skin-facing surface,

the bonding layer is selectively provided in a region opposed to an apex of the curved portion in a thickness direction.

11. The absorbent article according to any one of claims 2 to 4, 9 and 10, wherein:

the fastener is a planar fastener,

the ventral portion is provided with a buckling layer which can be buckled with the buckling surface,

12. The absorbent article according to any one of claims 1 to 4, 9, 10, wherein:

13. The absorbent article according to any one of claims 1 to 4, 9, 10, wherein:

the side wing portions are constituted by an elastic sheet that is stretchable in the width direction over the entire region in the front-rear direction.

14. The absorbent article of claim 13, wherein:

a ratio of a maximum elongation of the wing portion in the width direction to a total length of the absorbent main body in the front-rear direction is 5% or more.

15. The absorbent article according to any one of claims 1 to 4, 9, 10, wherein:

the side portions are constituted by side pieces joined between the both side edge portions of the back portion and the fastener tape.

16. The absorbent article according to any one of claims 1 to 4, 9, 10, wherein: