JP7110855B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to absorbent articles suitable for disposable diapers.

Conventionally, absorbent articles such as disposable diapers, urine pads, and sanitary napkins are known. Absorbent articles are provided with a liquid-permeable top sheet that is in contact with the skin, and an absorbent body comprising a fibrous material such as pulp or rayon and a superabsorbent polymer. Liquid moisture such as urine and menstrual blood excreted from the wearer permeates through the top sheet and is absorbed and retained by the absorber.

Various techniques have been proposed in order to improve the fit of absorbent articles when worn, as well as the ability to absorb and retain excrement. For example, Patent Literature 1 discloses an absorbent article in which compressed portions (concave portions) are formed by compressing an absorbent body in the thickness direction. In the absorbent article of Patent Document 1, two linear concave portions are provided in the longitudinal direction.

JP 2014-136126 A

One object of the present invention is to stably suppress the diffusion of loose feces by means of recesses provided on the skin-facing side of the absorbent article. In addition to this purpose, it is also possible to achieve actions and effects that are derived from each configuration shown in the "Mode for Carrying out the Invention" described later and that cannot be obtained with conventional techniques. It can be positioned as another purpose.

The absorbent article disclosed herein comprises a laminate having an absorbent body and a liquid-permeable top sheet disposed on the skin-facing surface side of the absorbent body, and groove-shaped recesses extending in a grid pattern, the recesses being a plurality of first inclined portions inclined at an angle of 45° ± 10° with respect to the longitudinal direction of the laminate, and and a plurality of second inclined portions that are inclined at an angle of -45° ± 10° and intersect with the first inclined portion, and the width of each of the first inclined portion and the second inclined portion is 1 .5 mm or more and 5 mm or less, the depth of each of the first inclined portion and the second inclined portion is 1.5 mm or more and 15 mm or less, and the anus-facing portion facing the wearer's anus is the center The volume of the recess included in the circular area with a diameter of 100 mm defined as above is 1.5 cm ³ or more and 15 cm ³ or less, and in the cross section extending in the longitudinal direction and including the anus-facing portion, the total amount of the recess The cross-sectional area is 30 mm ² or more and 300 mm ² or less, and the total cross-sectional area of the recesses is 5 mm ² or more and 65 mm ² or less in a cross section extending in the width direction of the laminate and including the anus-facing portion.

According to the absorbent article shown in this case, it is possible to stably suppress the diffusion of loose feces.

1 is a plan view development of a paper diaper according to an embodiment and an example. FIG. FIG. 2 is an exploded perspective view of the disposable diaper of FIG. 1; FIG. 2 is a cross-sectional view taken along line III-III in FIG. 1; FIG. 2 is a plan view of a laminate applied to the paper diaper of FIG. 1; 5 is a cross-sectional view of a recess provided in the laminate of FIG. 4; FIG. 1 is a plan view development of a paper diaper according to an example. FIG.

Hereinafter, the form for carrying out this case is demonstrated. The following embodiments are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described in these embodiments. Each configuration of this embodiment can be modified in various ways without departing from the gist thereof. again,
They can be selected or discarded as necessary, and can be combined as appropriate.

The absorbent article described in the embodiments is a sanitary product that is worn by a wearer and absorbs and retains water in excrement such as urine and feces excreted by the wearer (hereinafter referred to as "excretion water"). These absorbent articles include tape-type and underpants-type disposable diapers (so-called "disposable diapers"), which are worn directly on the wearer, as well as urine pads, sanitary napkins, panty liners, etc. Those worn on the wearer's underwear or the like are also included.

In the following embodiments, in a paper diaper as an absorbent article, a front body arranged to face the wearer's abdomen and a back body arranged to face the wearer's back are arranged on the extending surface of the paper diaper. The direction to connect with is taken as the longitudinal direction. In the extended surface of the paper diaper, between the front body (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (center in the longitudinal direction), there is a The crotch part to be arranged) is located. In addition, in a state in which the paper diaper is worn by the wearer (hereinafter abbreviated as "wearing state"), the side facing the wearer's skin (the inner side in the worn state) is the skin-facing side. The opposite side (outer side) is the non-skin facing side. Further, the direction connecting the skin facing side and the non-skin facing side is defined as the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is defined as the width direction. In addition, viewing from the side facing the skin in the thickness direction is defined as planar view. The width direction in plan view is also referred to as the left-right direction.

Regarding the direction of each component of the paper diaper, for example, when expressing along the longitudinal direction, not only parallel to the longitudinal direction but also substantially parallel to the longitudinal direction shall be included. Specifically, extending at an inclination angle of less than 45° with respect to the longitudinal direction is taken along the longitudinal direction. Similarly, when expressing along each direction such as the width direction and the thickness direction, it means extending at an inclination angle of less than 45° with respect to each direction. In this specification, the expression of a numerical range such as "1 to 100" includes both the lower limit "1" and the upper limit "100". The same applies to the notation of other numerical ranges.

In this embodiment, a tape-type disposable diaper is exemplified as an absorbent article. A tape-type disposable diaper has a front body and a back body that are separated from each other around the waist, unlike pants-type disposable diapers in which the wearer's waist is continuously formed. This tape-type paper diaper is worn by various wearers such as infants and adults requiring nursing care. Hereinafter, the "tape type paper diaper" is simply referred to as "paper diaper" for short.

[1. Constitution]
[1-1. Basic configuration]
The basic configuration of the paper diaper 100 will be described with reference to FIGS. 1 to 3. FIG. In addition, in the cross-sectional view of FIG. 3, the thickness of each sheet is exaggerated in order to facilitate understanding of each configuration.

As shown in FIG. 1, the paper diaper 100 according to the present embodiment is formed symmetrically with respect to the center line C in the width direction (symmetrical with respect to the center line C). The paper diaper 100 is roughly divided into three regions, a front body 2, a crotch part 3, and a back body 4, along the longitudinal direction. The front body 2 is a region located on the lower abdomen side of the wearer when worn. The back body 4 is a region located on the buttock side of the wearer when worn. The crotch part 3 is located between the front body part 2 and the back body part 4, and is a region located in the wearer's crotch when worn.

The disposable diaper 100 includes a pair of left and right front side flaps 5 extending outward in the width direction from the crotch portion 3 in the front body 2 and left and right side flaps extending outward in the width direction from the crotch portion 3 in the back body 4. It has a pair of rear side flaps 6 . Moreover, the paper diaper 100 has a fastening mechanism for holding the paper diaper 100 in a worn state. In this embodiment, a pair of left and right fastening tapes (hereinafter abbreviated as "tape") 60 provided projecting outward in the width direction from each rear side flap 6, and a tape 60 provided on the front body 2 A fastening mechanism configured with a patch 38 to be fastened is illustrated. Instead of this, the tape 60 may be provided so as to project outward in the width direction from the front side flaps 5 and the patch 38 may be provided on the back body 4 . Also, two or more pairs of tapes 60 may be provided on the left and right sides.
Each component of the disposable diaper 100 will be described below.

[Laminate]
The disposable diaper 100 includes the laminate 10 at least at the crotch portion 3 . The laminate 10 of this embodiment is provided over the front body 2 , the crotch part 3 , and the back body 4 . The laminate 10 has a substantially rectangular shape in a plan view, and is provided such that its longitudinal direction and width direction are aligned with the longitudinal direction and width direction of the paper diaper 100, respectively. As shown in FIGS. 2 and 3, the laminate 10 includes an absorbent body 20, a top sheet 31 laminated on the skin-facing side of the absorbent body 20, and a layered body on the non-skin facing side of the absorbent body 20. and a backsheet 32 . That is, the laminate 10 is a laminate structure in which the top sheet 31 and the back sheet 32 are arranged on both main surface sides of the absorbent body 20 .

The laminate 10 allows excreted moisture from the skin-facing side to permeate the top sheet 31, absorbs and retains the permeated excreted moisture by the absorbent body 20, and leaks to the outside from the skin-non-facing side by the back sheet 32. prevent The top sheet 31 and back sheet 32 and the absorbent body 20 can be fixed with a known adhesive such as a hot-melt adhesive.

<Absorber>
The absorber 20 is a mat-like (or pad-like) member that absorbs and holds excreted water. As shown in FIG. 1, in this embodiment, an hourglass-shaped absorbent body 20 provided between the front body 2 and the back body 4 is illustrated. That is, the absorbent body 20 has a shape in which the longitudinal middle portion arranged in the crotch portion 3 is narrowed in the width direction with respect to both longitudinal end portions arranged in the front body 2 and the back body 4. It is In addition, the absorbent body 20 has an asymmetrical shape in which the longitudinal dimension of the large widthwise dimension on the back body 4 side is larger than the longitudinal dimension of the large widthwise dimension on the front body 2 side. It's becoming However, the planar shape of the absorber 20 is not limited to the shape described above, and may be a rectangle (i.e., the width dimension is constant), or a dumbbell shape in which both ends in the longitudinal direction are circular. may be

As shown in FIG. 3 , the absorbent body 20 has an absorbent core 21 and a core wrap sheet (hereinafter abbreviated as “wrap sheet”) 24 . The absorbent body 20 is formed by wrapping (wrapping) an absorbent core 21 with a wrap sheet 24 . That is, the absorbent body 20 has the absorbent core 21 embedded in the wrap sheet 24 .

(absorbent core)
The absorbent core 21 is a mat-like member that absorbs and retains liquid. The absorbent core 21 comprises a superabsorbent polymer (SAP, also called superabsorbent polymer or superabsorbent polymer) 22 and fibrous material 23 . The absorbent core 21 is formed by mixing a fiber material 23 with a superabsorbent polymer 22 . The fiber material 23 is formed by entangling hydrophilic ultrafine fibers. The superabsorbent polymer 22 is usually embedded and retained in the fiber material 23 by being mixed with the fiber material 23 . Superabsorbent polymer 22 is capable of absorbing and retaining liquids dispersed by fibrous material 23 .

As the superabsorbent polymer 22, various known materials used as absorbent materials in absorbent articles such as disposable diapers and urine pads can be used. For example, starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer saponified products, starch-ethyl acrylate graft copolymer saponified products; celluloses such as sodium carboxymethyl cellulose crosslinked products; System: Synthetic polymer system such as polyacrylic acid (salt), polyethylene oxide crosslinked with acrylic acid, and crosslinked product of polyvinyl alcohol-maleic anhydride reaction can be used as the superabsorbent polymer 22 . Among these, polyacrylic acid (salt) is preferred, and sodium polyacrylate is more preferred, from the viewpoint of absorbability. These may be used individually by 1 type, and may be used in combination of 2 or more type. Although the shape of the superabsorbent polymer 22 is not particularly limited, for example, granular, powdery, pellet-like, sol-like, film-like, fiber-like, etc. can be used.

Examples of the fibrous material 23 include cellulose fibers such as pulp fibers, rayon fibers, and cotton fibers; synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate, which have been subjected to hydrophilic treatment. Among them, from the viewpoint of absorbability, it is preferable to use fluff pulp obtained by pulverizing or disentangling fibers or synthetic fibers. These may be used individually by 1 type, and may be used in combination of 2 or more type.

(rap sheet)
The wrap sheet 24 is a sheet-like member covering the absorbent core 21 . The wrap sheet 24 covers the entire absorbent core 21 including the skin facing side and the non-skin facing side of the absorbent core 21 . By wrapping the absorbent core 21 with the wrap sheet 24, the shape of the absorbent core 21 is ensured.
The wrap sheet 24 can be made of known materials used in absorbent articles. As a material constituting the wrap sheet 24, for example, paper such as tissue paper; spunbond nonwoven fabric, needle punch nonwoven fabric, spunlace nonwoven fabric, air through nonwoven fabric, SMS (Spunbond Meltblown Spunbond) nonwoven fabric, etc. can be used.

<Top sheet>
The top sheet 31 is a sheet-like member arranged on the skin-facing surface side of the laminate 10 . The top sheet 31 has a width dimension larger than that of the absorbent body 20, and covers the entire surface of the absorbent body 20 from the side facing the skin. In addition, the top sheet 31 is in contact with the skin of the wearer in the worn state, and allows excreted water to permeate and be absorbed by the absorber 20 . Therefore, at least a portion of the top sheet 31 is made of a liquid-permeable material. In addition, the top sheet 31 is preferably made of a highly flexible material in order to ensure good fit to the wearer. Also, in order to suppress stuffiness in the wearing state, it is preferable to be made of a material having air permeability.

As a material constituting the top sheet 31, for example, a woven fabric, a nonwoven fabric, a porous film, or the like can be used. Alternatively, as the top sheet 31, a non-woven fabric obtained by subjecting thermoplastic resin fibers such as polypropylene, polyethylene, polyester, and nylon to hydrophilic treatment may be used. As the nonwoven fabric constituting the top sheet 31, for example, a spunbond nonwoven fabric, a needle-punched nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, a meltblown nonwoven fabric, an SMS nonwoven fabric, or the like can be used.

<Back seat>
The back sheet 32 is a sheet-like member arranged on the side of the laminate 10 closest to the non-skin facing surface. The back sheet 32 has a width dimension larger than that of the absorbent body 20 and the top sheet 31, and covers the entire surface of the absorbent body 20 and the top sheet 31 from the non-skin facing side. In addition, the back sheet 32 prevents excrement from leaking from the absorbent body 20 to the non-skin facing side. Therefore, the back sheet 32 is made of a liquid-impermeable material. In addition, the back sheet 32 is preferably made of a material that is also moisture-permeable in order to prevent stuffiness in the worn state.

As a material for forming the back sheet 32, for example, a thermoplastic resin sheet such as polyethylene or polypropylene can be used. Among them, as the back sheet 32, it is preferable to use a microporous thermoplastic resin sheet in which a plurality of fine pores of 0.1 to 0.4 μm are formed. As such a sheet, for example, a sheet obtained by kneading an inorganic filler in a thermoplastic resin to form a sheet and then stretching the sheet can be used.

[Other sheets]
The disposable diaper 100 further includes a side sheet 33 and a cover sheet 35 laminated on the laminate 10 . The side sheet 33 and the cover sheet 35 can be fixed to the laminate 10 with a known adhesive such as a hot melt adhesive.

<Side seat>
The side sheets 33 are a pair of left and right members provided on both sides in the width direction of the laminate 10 in order to form three-dimensional gathers 42 described later on both sides of the laminate 10 . The side sheets 33 are arranged from the outside in the width direction of the laminate 10 to the skin facing side. As shown in FIG. 2, the side sheets 33 include a front flap portion 34A that extends outward in the width direction from the crotch portion 3 in the front body 2, and a front flap portion 34A that extends outward in the width direction from the crotch portion 3 in the back body 4. and a rear flap portion 34B that extends out.

As shown in FIG. 3 , the side sheets 33 are provided so as to protrude outward in the width direction from the top sheet 31 and the back sheet 32 . More specifically, the side sheet 33 is laminated on the skin facing surface side from the outside in the width direction of the top sheet 31 and the back sheet 32 to the side portions. The side sheets 33 stand up in the direction of coming into contact with the wearer's skin (the side facing the skin) due to the contraction of the three-dimensional gathers 42 .

The side sheets 33 are preferably made of a non-liquid-permeable material in order to prevent liquid from leaking outward in the width direction. A spunbond nonwoven fabric can be used as the side sheet 33 . A part of the side sheet 33 is arranged on the most skin-facing side of the disposable diaper 100 (for this reason, the side sheet 33 is also called a "top sheet" like the top sheet 31). As the side sheet 33 that can come into contact with the wearer in this way, a spunbond nonwoven fabric that is enhanced in flexibility by including a meltblown layer such as SMS nonwoven fabric or SMMS (Spunbond Meltblown Meltblown Spunbond) nonwoven fabric is used. is preferred. Alternatively, it is preferable to use a spunbonded nonwoven fabric with improved softness by suppressing the fineness and basis weight of the fibers forming the spunbonded nonwoven fabric.

The "fineness" is a parameter corresponding to the fiber diameter (thickness) and cross-sectional area of the fiber, and is represented by the weight per predetermined length. For example, the number of grams (decitex) per 10,000 m of one fiber is used as the "fineness." Also, the "basis weight" is a parameter corresponding to the thickness or the degree of lamination of the sheet, and is represented by the weight per unit area. For example, the number of grams per square meter is used as the "basis weight".

<Cover sheet>
The cover sheet 35 is a sheet-like member that covers the laminate 10 from the non-skin facing side. The cover sheet 35 is arranged on the non-skin-facing side of the disposable diaper 100, except for the patch 38, to reinforce the back sheet 32 and improve the feel (tactile sensation) of the back sheet 32. be done. The cover sheet 35 has a width dimension larger than that of the absorber 20, the top sheet 31 and the back sheet 32, and is arranged around the wearer's crotch, buttocks, waist, abdomen, etc. in the wearing state. As shown in FIG. 2, the cover sheet 35 includes a pair of left and right front flap portions 36A extending outward in the width direction from the crotch portion 3 in the front body 2, and a pair of front flap portions 36A extending in the width direction from the crotch portion 3 in the back body 4. and a pair of left and right rear flap portions 36B extending outward.

Examples of materials that constitute the cover sheet 35 include woven fabrics and non-woven fabrics. Among them, it is preferable to use nonwoven fabrics and wet-laid nonwoven fabrics made of thermoplastic resins such as polyethylene, polypropylene, and polyester. In particular, a spunbonded nonwoven fabric can be suitably used as the cover sheet 35 from the viewpoint of flexibility in order to ensure a tactile sensation (touch).

In the disposable diaper 100 configured as described above, each member is laminated in the order of the side sheet 33, the top sheet 31, the absorbent body 20, the back sheet 32, and the cover sheet 35 from the skin facing side toward the non-skin facing side. It is The side sheet 33 and the cover sheet 35 are bonded together with a known adhesive such as a hot melt adhesive. The front side flaps 5 are formed by the front flap portions 34A and 36A of the side sheet 33 and the cover sheet 35, respectively. A rear side flap 6 is formed by the rear flap portions 34B and 36B of the side sheet 33 and the cover sheet 35, respectively.

[Fastening mechanism]
The fastening mechanism realizes a function of fastening the front body 2 and the back body 4 together. As the fastening mechanism, for example, a planar fastener (mechanical fastener) that mechanically couples a hook member (male member) and a loop member (female member) can be used. The hook member here is a sheet-like member having a large number of hook-shaped, mushroom-shaped, or anchor-shaped projections formed on its surface. The loop member here is a sheet-like member made of nonwoven fabric having loop-shaped fibers arranged on its surface or composed of short fibers. Moreover, an adhesive or an adhesive tape can be used as a fastening mechanism. Among them, the planar fastener is preferable because the hook member and the loop member can be firmly fixed together and can be peeled off and used repeatedly. In this embodiment, the tape 60 functions as a hook member and the patch 38 functions as a loop member.

<Patch>
The patch 38 of this embodiment is attached to the outer surface of the front body 2 of the cover sheet 35 (the side closest to the non-skin facing side of the paper diaper 100). As the patch 38, for example, a non-woven fabric made of fibers of thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon is used.

<tape>
The tape 60 can be attached to the patch 38, and when the paper diaper 100 is folded on the skin facing side so that the front body 2 and the back body 4 face each other around the crotch part 3, the tape 60 is stretched in the width direction. are pulled outwardly and fastened to the patch 38 . The paper diaper 100 is attached to the wearer by fastening the tape 60 to the patch 38 in this way.

As shown in FIGS. 1 and 2 , the tape 60 has a sheet-like fastening portion 61 fixed to the rear side flap 6 and protruding outward from the rear side flap 6 . A locking member 64 that is a hook member for fixing the front body 2 and the back body 4 is provided on the side of the fastening portion 61 facing the skin. The fastening portion 61 fastens the front body 2 and the back body 4 via the locking member 64 and the patch 38 .

The fastening portion 61 has a base portion 62 on the inner side in the width direction and a protruding portion 63 that protrudes outward in the width direction from the base portion 62 . The base portion 62 is fixed to the rear side flap 6 by being sandwiched between the rear flap portions 34B and 36B of the side sheet 33 and the cover sheet 35 . The protruding portion 63 protrudes outward in the width direction from the side sheet 33 and the cover sheet 35 and is provided in a state of being exposed to the outside. A locking member 64 is provided on the side of the protruding portion 63 facing the skin.

As a material for forming the fastening portion 61 of the tape 60, for example, a woven fabric, a non-woven fabric, a resin film, paper, or the like can be used. Thermoplastic resins, such as polyethylene, polypropylene, polyamide, polyester, polyvinyl chloride, and polystyrene, can be used as the material constituting the woven fabric, nonwoven fabric, or resin film.

〔gather〕
The paper diaper 100 is provided with gathers 41 to 43 in order to enhance the ability to follow the wearer when worn. The gathers 41 to 43 are formed by sandwiching stretchable members (stretchable members) such as rubber, polyurethane, or stretchable film between sheets of nonwoven fabric or the like in a stretched state, and fixing them by hot-melt, heat-sealing, ultrasonic welding, or the like. It is composed of a sheet composite that has been stretched by In this sheet composite, the sheet is finely wrinkled due to the force (restoring force, elastic force) that causes the elastic member to return from the stretched state to the original state (natural length state). Here, thread-like rubber members (hereinafter abbreviated as “string rubber”) 51 to 53 are exemplified as elastic members.

In the present embodiment, as the gathers 41 to 43, three types of rubber threads 51 to 53 imparting stretchability are exemplified. One is a leg gather 41 in which the widthwise ends of the back sheet 32 and the cover sheet 35 and the widthwise outer end of the side sheet 33 are crimped with the first rubber thread 51 . The other one is a three-dimensional gather 42 in which the inner end portion in the width direction of the side sheet 33 is wrinkled with the second rubber thread 52 . The remaining one is a waist gather 43 in which each end of the top sheet 31 , back sheet 32 , side sheet 33 , and cover sheet 35 on the back side in the longitudinal direction is crimped with a third rubber thread 53 .

The leg gathers 41 are provided to enhance conformability to the wearer's legs (reduce the gap between the wearer's legs and the paper diaper 100). As shown in FIG. 1, the leg gathers 41 are provided at locations surrounding the wearer's legs in the wearing state. As shown in FIGS. 2 and 3 , the first rubber thread 51 is provided on the side of the skin facing surface at the end of the back sheet 32 in the width direction, and is interposed between the back sheet 32 and the side sheet 33 . be done.

The three-dimensional gathers 42 are provided in order to enhance the followability to the wearer on the side of the excretion site. The three-dimensional gathers 42 have the function of preventing the excrement from leaking outward in the width direction. As shown in FIG. 1 , the three-dimensional gathers 42 are arranged inside the side sheets 33 in the width direction. As shown in FIGS. 2 and 3, the second rubber thread 52 is provided at the inner end portion of the side sheet 33 in the width direction, and the inner end portion is folded toward the non-skin-facing surface portion so as to be doubled. It is interposed between the overlapped parts 33A and 33B.

The waist gathers 43 are provided to enhance the followability to the wearer's buttocks and lower abdomen. As shown in FIG. 1 , the waist gathers 43 are arranged between the left and right rear side flaps 6 . As shown in FIG. 2, the waist gathers 43 of this embodiment are formed by narrowing a plurality of stretched third rubber threads 53 extending in the width direction between a set of non-stretchable base sheets. It is composed of an elastic sheet 54 . The stretchable sheet 54 is interposed between the top sheet 31 and the back sheet 32 or cover sheet 35 .

[1-2. Detailed configuration]
Next, the detailed configuration of the disposable diaper 100 will be described.

FIG. 4 is a plan view of the laminate 10. FIG. As shown in FIG. 4 , groove-like recesses 70 extend in a grid pattern on the side of the skin-facing surface of the laminate 10 . The concave portion 70 is a portion of the laminated body 10 that is lower than the surroundings in the thickness direction. The concave portion 70 is provided in a region of the laminate 10 where the absorber 20 exists, and extends linearly in a plan view of the laminate 10 .

The concave portion 70 has a first inclined portion 71 (only a part of which is labeled) and a second inclined portion 72 (only a portion of which is labeled) which intersect each other. That is, the first inclined portion 71 and the second inclined portion 72 form a lattice shape (grid pattern) in plan view. The first inclined portion 71 is a linear portion inclined at an angle of 45°±10° in one width direction (for example, rightward) with respect to the longitudinal direction. On the other hand, the second inclined portion 72 is a linear portion inclined at an angle of 45°±10° to the other width direction (for example, leftward) with respect to the longitudinal direction.

Here, assuming that the inclination angle θ with respect to the longitudinal direction is positive when the first inclined portion 71 is inclined with respect to the longitudinal direction, the inclination angle θ of the first inclined portion 71 is 45°±10°. The inclination angle θ of the two inclined portions 72 is −45°±10°. In this way, each of the first inclined portion 71 and the second inclined portion 72 extends in a direction that intersects both the longitudinal direction and the width direction. Also when it spreads in the direction of , it passes through (crosses) at least one of the first inclined portion 71 and the second inclined portion 72 . Therefore, loose stool is less likely to spread in both the longitudinal direction and the width direction. In this embodiment, the inclination angle θ of the first inclined portion 71 is 45° and the inclination angle θ of the second inclined portion 72 is −45° with respect to the longitudinal direction.

In the laminated body 10, a plurality of first inclined portions 71 are provided parallel to each other, and a plurality of second inclined portions 72 are also provided parallel to each other. Both the interval M1 of the first inclined portion 71 and the interval M2 of the second inclined portion 72 are usually 10 mm or more, preferably 15 mm or more, more preferably 20 mm or more, and usually 40 mm or less, preferably 35 mm or less, more preferably 30 mm or less. When the intervals M1 and M2 are below the above lower limit values, the number of the first inclined portions 71 and the second inclined portions 72 per unit area provided in the laminate 10 increases. tends to increase with respect to other areas. In this case, loose stool tends to spread along the inside of the concave portion 70, and diffusion of loose stool tends to be difficult to be suppressed. Moreover, in this case, the hardness of the laminate 10 is increased (the flexibility is decreased), and the wearing comfort and fit are likely to be impaired. Further, when the intervals M1 and M2 exceed the above upper limit values, the number of the first inclined portions 71 and the second inclined portions 72 per unit area provided in the laminate 10 decreases. The area it occupies tends to decrease relative to the other areas. In this case, it is likely to be difficult to obtain the effect of suppressing the diffusion of loose stools by the concave portion 70 . Also, in this case, air permeability is reduced, and it is difficult to prevent stuffiness in the wearing state. On the other hand, when the intervals M1 and M2 are within the above range, the free diffusion of loose feces is suppressed satisfactorily. , the flexibility and air permeability of the laminate 10 are likely to be ensured. In addition, in this embodiment, the case where the intervals M1 and M2 between the first inclined portion 71 and the second inclined portion 72 are equal to each other (M1=M2) is exemplified.

Here, the part 11 facing the wearer's anus on the skin-facing side of the laminate 10 is referred to as the "anus-facing part 11". The position of the anus-facing portion 11 changes depending on the size and positional relationship of the laminate 10 with respect to the wearer's body, but it is usually located at the center of the laminate 10 in the width direction and is located at the crotch portion 3 in the longitudinal direction of the laminate 10 . It is a part closer to the dorsal side than the center of the.

In this embodiment, one of the grids formed by the concave portions 70 is provided so as to surround the anus-facing portion 11 . That is, both the first inclined portion 71 and the second inclined portion 72 are provided so as not to overlap the anus-facing portion 11 . As a result, even if loose stool spreads from the anus-facing portion 11 in any direction, it passes through at least one of the first sloping portion 71 and the second sloping portion 72, so that the diffusion of loose stool is easily suppressed. In addition, when at least one of the first inclined portion 71 and the second inclined portion 72 is provided on the anus-facing portion 11, loose feces may spread along the first inclined portion 71 or the second inclined portion 72. , a diffusion suppressing action can be obtained by holding loose feces in the recess 70 .

As indicated by a two-dot chain line in FIG. 4, in the laminate 10, a circular region 10A with a diameter of 100 mm is defined around the anal-facing portion 11. As shown in FIG. Circular region 10A is a region in layered product 10 to which loose stool is likely to adhere. If the spread of loose feces is suppressed in the circular region 10A, leakage of loose feces from the paper diaper 100 can be effectively suppressed. Hereinafter, the volume of the space formed by the concave portion 70 falling below its surroundings is referred to as "the volume of the concave portion 70". Further, when the laminate 10 is cut in the thickness direction, the area of the space appearing in the cross section is referred to as "the cross-sectional area of the concave portion 70".

At least one first inclined portion 71 and at least one second inclined portion 72 having a length L of 40 mm or more are provided in the circular area 10A of the present embodiment. In other words, the maximum length Lmax of the first inclined portion 71 and the second inclined portion 72 provided in the circular area 10A is 40 mm or more. In this way, when at least one first inclined portion 71 and one second inclined portion 72 having a length L of 40 mm or more are provided in the circular region 10A, the volume of the recess 70 in the circular region 10A (a “circular Inner volume") Va is easily secured, so that diffusion of loose feces is easily suppressed. Further, in this case, since the circular region 10A is easily bent by the first inclined portion 71 and the second inclined portion 72, the hardness and stiffness of the laminated body 10 are moderately suppressed (flexibility is ensured), and the wear at the time of wearing is improved. Comfort and fit are less likely to deteriorate.

As shown in FIG. 3, in this embodiment, recesses 70 are formed by recessing the top sheet 31, the wrap sheet 24, and the absorbent core 21. As shown in FIG. A bank portion 21</b>A that protrudes toward the skin-facing surface side of the recess 70 is provided on the outer side of the recess 70 in the absorbent body 20 in the width direction. In other words, the recesses 70 are provided so as to avoid both ends in the width direction of the absorbent body 20 . The bank portion 21A is a portion having a larger dimension in the thickness direction than the concave portion 70, and has a function of suppressing the spread of loose stool that has entered the concave portion 70 to the outside in the width direction. That is, by providing the bank portion 21A outside the recess 70 in the width direction, it becomes easier to suppress the spread of loose stool from the recess 70 to the outside in the width direction. Therefore, leakage of loose stools (side leakage) to the periphery of the wearer's legs can be easily prevented.

As shown in FIG. 5, each of the first inclined portion 71 and the second inclined portion 72 is formed so that the width W and the depth D are within a predetermined range. The width W referred to here is the dimension of each of the first inclined portion 71 and the second inclined portion 72 in a direction orthogonal to both the extending direction and the thickness direction of the laminate 10 . The width W is determined based on the openings of the first inclined portion 71 and the second inclined portion 72 (portions located on the surface of the laminate 10). The depth D here is the length from the opening to the deepest position (bottom portion) in each of the first inclined portion 71 and the second inclined portion 72 . Here, the opening means a portion of the surface of the laminate 10 surrounded by a boundary line between the first inclined portion 71 and the second inclined portion 72, and other substantially flat portions.

Each width W and each depth D of the first inclined portion 71 and the second inclined portion 72 are determined on the basis of a state in which no external force is applied to the laminated body 10 spread flat. Although the method of measuring the width W and the depth D is not particularly limited, for example, the laminate 10 is cut in the thickness direction so as to cross the first inclined portion 71 and the second inclined portion 72, and the second A method of measuring the first inclined portion 71 and the second inclined portion 72 can be used. At this time, if necessary, the cut surface may be observed with a microscope for measurement.

Each width W of the first inclined portion 71 and the second inclined portion 72 is 1.5 mm or more, preferably 2 mm or more, more preferably 2.5 mm or more, still more preferably 3 mm or more, and 5 mm or less, preferably 4.5 mm or more. It is 5 mm or less, more preferably 4 mm or less, still more preferably 3.5 mm or less. When each width W of the first inclined portion 71 and the second inclined portion 72 is less than the above lower limit value, loose feces do not flow into the recess 70 but easily pass over the recess 70 and spread over the laminate 10, thereby suppressing the diffusion of loose feces. It's easy to be difficult. Further, when the width W of each of the first inclined portion 71 and the second inclined portion 72 exceeds the above upper limit value, loose stool tends to spread along the inside of the recess 70, and diffusion of loose stool tends to be difficult to be suppressed. On the other hand, when each width W of the first inclined portion 71 and the second inclined portion 72 is within the above range, free diffusion of loose stool is likely to be suppressed. In addition, the width W is preferably substantially the same in the extending direction of the first inclined portion 71 and the second inclined portion 72 in order to uniformly produce the effect of suppressing the diffusion of loose feces by the concave portion 70 . Moreover, it is preferable that the width W is substantially the same in each first inclined portion 71 and each second inclined portion 72 .

Each depth D of the first inclined portion 71 and the second inclined portion 72 is 1.5 mm or more, preferably 3 mm or more, more preferably 4 mm or more, still more preferably 5 mm or more, and 15 mm or less, preferably 12 mm or less, It is more preferably 10 mm or less, still more preferably 8 mm or less. When each depth D of the first inclined portion 71 and the second inclined portion 72 is below the above lower limit value, when loose feces flow into the recess 70, they have a sufficient volume to suppress the diffusion of loose feces. This makes it difficult to suppress the spread of loose stools. Further, when the depth D of each of the first inclined portion 71 and the second inclined portion 72 exceeds the above upper limit value, it becomes difficult to maintain the shape of the recess 70, and the recess 70 bends and deforms, causing an inward deformation. The uptake of loose stools is likely to be hindered. On the other hand, when each depth D of the first inclined portion 71 and the second inclined portion 72 is within the above range, free diffusion of loose feces is likely to be suppressed.

The concave portion 70 is formed so that a cross-sectional area (hereinafter referred to as “cross-sectional area”) A when cut in a direction perpendicular to its extending direction is within a predetermined range. The cross-sectional area A of the recess 70 can be defined by the product (W×D) of the width W and the depth D of the recess 70 as the area when the cross section of the recess 70 is approximated to have a rectangular shape. The cross-sectional area A of the concave portion 70 is usually 2.25 mm ² or more, preferably 6 mm ² or more, more preferably 10 mm ² or more, still more preferably 15 mm ² or more, and usually 75 mm ² or less, preferably 54 mm ² or less, more preferably. is 40 mm ² or less, more preferably 28 mm ² or less. When the cross-sectional area A of the concave portion 70 is within the above range, it becomes easy to secure a sufficient volume that can stop loose stool from spreading when it flows into the concave portion 70 . Therefore, the free diffusion of loose stools is likely to be suppressed, and the diffusion of loose stools is likely to be stably suppressed. Although the cross-sectional shape of the concave portion 70 is rectangular in this embodiment, the cross-sectional shape of the concave portion 70 is not particularly limited. good too.

The volume Va of the concave portion 70 included in the circular region 10A (hereinafter referred to as the “inner volume of the circle”) Va is 1.5 cm ³ or more, preferably 1.8 cm ³ or more, more preferably 2 cm ³ or more, and 15 cm ³ or less. It is preferably 13 cm ³ or less, more preferably 11 cm ³ or less. When the volume Va within the circle is equal to or greater than the above lower limit value, loose stool spreading from the anus-facing portion 11 is easily held by the concave portion 70 in the circular region 10A, and diffusion of loose stool outside the circular region 10A is easily suppressed. Further, when the inner volume Va of the circle is equal to or less than the above upper limit value, the portion other than the concave portion 70 is also secured within the circular region 10A, so that the excreted water is easily retained within the circular region 10A, and is discharged to the outside of the circular region 10A. Diffusion of excreted water from the body is also easily suppressed. In this way, if the inner volume Va of the circle is within the above range, the concave portion 70 and other portions in the circular region 10A can be balanced, and both the effect of suppressing the diffusion of loose feces and the effect of suppressing the diffusion of excreted water can be achieved. make it easier to

Here, as shown in FIG. 4, a cross section when the laminate 10 is cut in the thickness direction along a straight line YL that extends in the longitudinal direction of the laminate 10 and includes the anus-facing portion 11 is referred to as a "longitudinal cross section." Further, a cross section obtained by cutting the laminate 10 in the thickness direction along a straight line XL extending in the width direction of the laminate 10 and including the anus-facing portion 11 is referred to as a "width cross section".

The total cross-sectional area (hereinafter referred to as the longitudinal area) Ay of the recesses 70 included in the longitudinal cross section is 30 mm ² or more, preferably 40 mm ² or more, more preferably 45 mm ² or more, and 300 mm ² or less, preferably 270 mm ² or less, More preferably, it is 250 mm ² or less. Here, the longitudinal area Ay is the total cross-sectional area of each recess 70 included in the longitudinal cross section. When the longitudinal area Ay is equal to or greater than the above lower limit, it becomes easier to secure the amount of loose stool that enters the concave portion 70 when loose stool spreads from the anus-facing portion 11 in the longitudinal direction. Therefore, diffusion of loose feces in the longitudinal direction is suppressed, and leakage from the dorsal side (dorsal leakage) and leakage from the ventral side (abdominal leakage) are easily prevented. Further, when the longitudinal area Ay is equal to or less than the above upper limit value, portions other than the concave portion 70 are also secured in the longitudinal cross section. Therefore, it becomes easier to suppress the spread of excreted water in the longitudinal direction. Thus, if the longitudinal area Ay is within the above range, the concave portion 70 and other portions in the longitudinal cross section can be balanced, and it is easy to achieve both the effect of suppressing the diffusion of loose feces and the effect of suppressing the diffusion of excreted water. Become.

A total cross-sectional area (hereinafter referred to as "width area") Ax of the recess 70 included in the width cross section is 5 mm ² or more, preferably 7 mm ² or more, more preferably 8 mm ² or more, and 65 mm ² or less, preferably 50 mm ² . Below, more preferably below 40 mm ² . Here, the width area Ax is a value obtained by summing the cross-sectional areas of the recesses 70 included in the width cross section. When the width area Ax is equal to or greater than the above lower limit, it becomes easier to secure the amount of loose stool that enters the concave portion 70 when loose stool spreads in the width direction from the anus-facing portion 11 . Therefore, diffusion of loose feces in the width direction is suppressed, and side leakage is easily prevented. Further, when the width area Ax is equal to or less than the above upper limit value, portions other than the concave portion 70 are also secured in the width cross section. Therefore, it becomes easier to suppress the spread of the excreted water in the width direction. Thus, if the width area Ax is within the above range, the concave portion 70 and other portions in the width cross section can be balanced, and it is easy to achieve both the effect of suppressing the diffusion of loose stool and the effect of suppressing the diffusion of excreted water. Become.

In this embodiment, the recesses 70 form a square grid, but the shape of the grid formed by the recesses 70 is not limited to this. For example, the recesses 70 may form a lattice of diamonds that are shorter in the longitudinal direction than in the width direction. Specifically, with respect to the longitudinal direction, the inclination angle θ of the first inclined portion 71 is set to an angle larger than 45° (45°<θ), and the inclination angle θ of the second inclined portion 72 is smaller than -45°. An angle (θ<−45°) may be used. In this case, it becomes easier to increase the longitudinal area Ay, so that diffusion of loose feces in the longitudinal direction from the anus-facing portion 11 can be easily suppressed. Conversely, the recesses 70 may form a lattice of diamonds that are shorter in the width direction than in the length direction. Specifically, with respect to the longitudinal direction, the inclination angle θ of the first inclined portion 71 is set to an angle smaller than 45° (θ<45°), and the inclination angle θ of the second inclined portion 72 is set to be larger than −45°. An angle (−45°<θ) may be used. In this case, it becomes easier to increase the width area Ax, so that diffusion of loose feces in the width direction from the anus-facing portion 11 can be easily suppressed.

According to the concave portion 70 described above, the absorbent body 20, the top sheet 31 and the back sheet 32, and the paper diaper 100 are easily bent at the extending portion of the concave portion 70, and the fit of the paper diaper 100 to the wearer is improved. Secured. In addition, ventilation is ensured by allowing air to flow through the recesses 70 . In addition, by diffusing the excreted water along the recessed portion 70, the absorbing portions of the absorbent body 20 and the absorbent core 21 are distributed throughout, thereby increasing the absorbing power and holding power of the absorbent body 20 and the absorbent core 21. be able to.

Although the method of forming the laminate 10 and the recess 70 is not particularly limited, for example, the following method can be applied. First, an absorbent material comprising superabsorbent polymer 22 and fibrous material 23 is deposited to create a mat-like absorbent core 21 . Next, by covering the absorbent core 21 with a wrap sheet 24, the absorbent body 20 is obtained. Subsequently, the laminate 10 is obtained by laminating the top sheet 31 and the back sheet 32 on the absorbent body 20 . Further, by compressing the laminate 10 in the thickness direction, recesses 70 (compressed portions, compressed grooves) are formed.

In this case, the concave portion 70 can be provided by press-molding the laminate 10 in the thickness direction (laminating direction). Specifically, the laminated absorbent body 20 and top sheet 31 are pressed (compressed) from the side facing the skin in a convex shape of a predetermined shape (pattern). As a result, in addition to the absorbent body 20 and the top sheet 31, air contained in the pressed portion of the laminate 10 is compressed. Then, recesses 70 are formed (extrapolated) in which the absorbent core 21, the wrap sheet 24, and the top sheet 31 are engaged and fixed.

The shape (pattern) of the recesses 70 can be formed so as to meet the desired position, shape, and depth conditions depending on the shape of the convex mold for pressing the laminate 10 . At this time, the laminate 10 may be pressed by rotating the forming rolls at a speed corresponding to the conveying speed while conveying the laminate 10 using a forming roll having a convex shape on the outer periphery. Thereby, the recesses 70 can be formed continuously. In addition, if the compressed portion formed by compressing the laminate 10 in the thickness direction is used as the recessed portion 70, the recessed portion 70 can be formed relatively easily, and each of the recessed portions 70 as described above can be formed. Dimension setting can be achieved with high precision.

Note that the following method may be applied instead of the method using a convex mold as described above. First, the absorbent material including the superabsorbent polymer 22 and the fiber material 23 is deposited less (thinly) at the position of the recess 70 and deposited more (thickly) at other portions to form the mat-like absorbent core 21. to create Next, the absorbent body 20 is obtained by covering the absorbent core 21 with a wrap sheet 24 . By laminating the top sheet 31 and the back sheet 32 on the absorbent body 20, the laminate 10 provided with the concave portions 70 can be formed.

In order to maintain the shape of the recesses 70 , adhesive portions may be formed at the positions of the recesses 70 in the top sheet 31 , the wrap sheet 24 and the absorbent core 21 . At the bonding portion, at least two sheets selected from the wrap sheet 24 included in the laminate 10, the top sheet 31 on the skin facing side and the non-skin facing side, and the back sheet 32 are bonded. The adhesive part can be formed by a known method such as hot melt adhesive, heat sealing, ultrasonic welding, or the like. In the above description, the recess 70 is provided on the skin-facing surface side of the laminate 10, but the configuration of the recess 70 is not limited to this. It may be provided on both sides of the non-opposing side.

[2. Action and effect]
Since the disposable diaper 100 of the present embodiment is configured as described above, it is possible to obtain the following actions and effects.

Generally, loose stools are difficult to be absorbed by the absorber, so that if they adhere to the skin-facing side of the laminate, they spread over the surface of the laminate. Then, the loose stool may spread to the outside of the laminate and leak out of the paper diaper. In response to this, a technique has been proposed in which an embossed shape having a convex portion and a concave portion is formed on the skin-facing side of the laminate, and the concave portion is used to suppress the spread of loose stool. According to this technique, it is said that the diffusion of loose stools can be suppressed as compared with the case where the surface of the laminate is flat.

However, paper diapers to which this technique is applied cannot cope with various ways of spreading loose stool. That is, the way loose stool spreads varies depending on various factors such as the wearer's posture, movement, body shape and size. There was a large difference between the case where it could be suppressed and the case where it could not be suppressed. In other words, with conventional paper diapers, the diffusion area of loose stools varies greatly depending on the conditions of use. Therefore, when the diffusion area of loose stool becomes large, leakage of loose stool cannot be prevented.

On the other hand, in the disposable diaper 100, groove-shaped recesses 70 are provided in a grid pattern on the skin-facing surface side of the laminate 10, and the circular inner volume Va, the longitudinal area Ay, and the width area Ax of the recesses 70 are respectively It is set within a predetermined range. As a result, no matter how the loose stool spreads from the anus-facing portion 11, the diffusion of the loose stool can be suppressed. Therefore, the diffusion area of loose feces can be kept small regardless of the usage condition. Therefore, leakage of soft stool can be stably suppressed.

Specifically, loose stool is held in the recess 70 by entering the recess 70 when spreading outward from the anus-facing portion 11 . In other words, loose stool is temporarily stopped when passing through the recess 70 . For this reason, loose stool is suppressed from diffusing each time it passes through the concave portion 70 . In the disposable diaper 100, since the inner volume Va of the circle is within the above range, the spreading of loose stool outward from the anus-facing portion 11 can be satisfactorily suppressed first in the circular region 10A. In addition, since the longitudinal area Ay is within the above range, the diffusion of loose feces in the longitudinal direction from the anus-facing portion 11 can be suppressed satisfactorily. Diffusion of loose stools in the width direction from 11 is also suppressed satisfactorily.

Therefore, according to the paper diaper 100, even if the loose feces spread from the anus-facing portion 11 in any manner, the diffusion area of the loose feces can be kept small. Therefore, it is possible to stably and easily prevent leakage of loose stool regardless of the state of use.

EXAMPLES The present invention will be specifically described below with reference to Examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be changed as appropriate without departing from the gist of the present invention. Therefore, the present invention is not limited to the following examples.

== Diffusion control performance of loose stool ==
[Examples 1 to 9]
The paper diapers 100 shown in FIG. 1 were used as Examples 1-9. The main parts and dimensions of the configuration of the paper diapers 100 of Examples 1 to 9 are as follows.
・Width direction length of front body 2 and back body 4: 110mm
・Length in the width direction of the crotch part 3: 80 mm
・Longitudinal length of laminate 10: 390 mm
・Length in the width direction of the laminate 10: 180 mm
・The length of the absorber 20 in the longitudinal direction: 330 mm

In the paper diapers 100 of Examples 1 to 9, the inclination angle θ of each first inclined portion 71 with respect to the longitudinal direction is 45°, and the inclination angle θ of each second inclined portion 72 with respect to the longitudinal direction is −45°. That is, the concave portion 70 is provided in a grid pattern by the first inclined portion 71 and the second inclined portion 72 intersecting each other at 90° (perpendicular to each other). Thus, in Examples 1 to 9, each inclination angle θ of the first inclined portion 71 and the second inclined portion 72 with respect to the longitudinal direction is a value within the above range. In addition, the concave portion 70 is a compressed portion formed using a convex mold as described above.

In the paper diapers 100 of Examples 1 to 9, the width W of each of the first inclined portion 71 and the second inclined portion 72 is 2 mm, and the depth D of each is 6 mm. Thus, in Examples 1 to 9, each width W and each depth D of the first inclined portion 71 and the second inclined portion 72 are values within the above ranges.

Further, in the paper diapers 100 of Examples 1 to 9, various parameters related to the concave portion 70 are as shown in Table 1 below. As shown in Table 1, in Examples 1 to 9, the inner volume Va, the longitudinal area Ay, and the width area Ax are all within the above ranges.

[Examples 10 to 15]
The paper diapers 200 shown in FIG. 6 were used as Examples 10-15. The paper diapers 200 of Examples 10 to 15 have basically the same structure as the paper diapers 100 of Examples 1 to 9, but are formed larger overall than the paper diapers 100 of Examples 1 to 9. The structure of the recess 70 is different. The main parts and dimensions of the configuration of the paper diapers 200 of Examples 10 to 15 are as follows.
・Width direction length of front body 2 and back body 4: 115 mm
・Length in the width direction of the crotch part 3: 90 mm
・Longitudinal length of laminate 10: 430 mm
・Length in the width direction of the laminate 10: 190 mm
・The length of the absorber 20 in the longitudinal direction: 360 mm

Similarly to Examples 1 to 9, in the paper diapers 200 of Examples 10 to 15, the inclination angle θ of each first inclined portion 71 with respect to the longitudinal direction is 45°, and the inclination angle of each second inclined portion 72 with respect to the longitudinal direction is 45°. θ is −45°, and the concave portion 70 is a compressed portion formed using a convex mold. That is, in Example 2 as well, each inclination angle θ of the first inclined portion 71 and the second inclined portion 72 with respect to the longitudinal direction is a value within the above range.

In the paper diapers 200 of Examples 10 to 15, the width W of each of the first inclined portion 71 and the second inclined portion 72 is 3 mm, and the depth D of each is 6 mm. Thus, in Examples 10 to 15 as well, the width W and the depth D of the first inclined portion 71 and the second inclined portion 72 are values within the above ranges.

Further, in the paper diapers 200 of Examples 10 to 15, various parameters related to the concave portions 70 are as shown in Table 1 below. As shown in Table 1, in Examples 10 to 15, the inner volume Va, the longitudinal area Ay, and the width area Ax are all within the above ranges.

[Comparative Examples 1 to 26]
Compared to the disposable diaper 100 of Example 1, Comparative Examples 1 to 26 were obtained by changing various parameters related to the concave portion 70 as shown in Table 1 below. That is, the paper diapers of Comparative Examples 1 to 26 were first adjusted so that at least one of the inner volume Va, the longitudinal area Ay, and the width area Ax of the paper diaper 100 of Example 1 was outside the above range. Various parameters (inclination angle θ, width W, depth D, etc.) relating to the inclined portion and the second inclined portion are changed.

[Comparative Examples 27 to 35]
Compared to the disposable diaper 200 of Example 10, Comparative Examples 27 to 35 were obtained by changing various parameters related to the concave portion 70 as shown in Table 1 below. That is, the paper diapers of Comparative Examples 27 to 35 were prepared so that at least one of the inner volume Va, the longitudinal area Ay, and the width area Ax of the paper diaper 200 of Example 10 was outside the above range. Various parameters (inclination angle θ, width W, depth D, etc.) relating to the inclined portion and the second inclined portion are changed.

[Evaluation method]
The paper diapers of Examples 1 to 15 and Comparative Examples 1 to 35 were subjected to the following tests and judgments to evaluate the ability to suppress loose stool diffusion.

<Test>
60 g of bentonite [manufactured by Wako Pure Chemical Industries, Ltd., <<product name/model number bentonite>>] was mixed with 440 ml of water to prepare a soft stool sample. The paper diapers of Examples and Comparative Examples were unfolded, and the skin-facing side of the laminate was exposed and attached to a flat plate to obtain samples for evaluation. A 20 g sample of loose stool was placed on the anus-facing part, and a transparent resin film was laid thereon. Furthermore, using a roller of 2 kg, the loose stool sample was manually pressed once from above the transparent resin film toward the end on the dorsal side to stretch the loose stool sample. Then, the area over which the loose stool sample diffused was measured.
The above test was performed seven times on the samples for evaluation of each example and comparative example.

<judgment>
For each example and comparative example, the average value x and standard deviation σ (variation in diffusion area) were calculated from the 7 diffusion areas obtained in the above 7 tests, and the calculated average value x and standard deviation σ A coefficient of variation CV (CV=σ/x) was calculated from the above. Then, based on the calculated average value x and the coefficient of variation CV, the loose stool diffusion suppression performance was determined. Specifically, it was determined that the smaller the average value x of the diffusion area and the smaller the coefficient of variation CV, the better the ability to suppress diffusion of loose stools.

〔Evaluation results〕
Table 1 below shows the results of evaluation of the ability to suppress the diffusion of loose stools by the evaluation method described above, together with various parameters (circular volume Va, longitudinal area Ay, width area Ax) for each example and comparative example.

As is clear from Table 1, the paper diapers of Examples 1 to 15 have smaller average diffusion area x and coefficient of variation CV than the paper diapers of Comparative Examples 1 to 35, and are excellent in the ability to suppress the diffusion of loose stools. rice field. Specifically, in the paper diapers of Examples 1 to 15, the average value x of the diffusion area was suppressed to 188 mm ² (Example 6) at the maximum, and the coefficient of variation CV was suppressed to 0.203 (Example 5) at the maximum. was taken. On the other hand, in Comparative Examples 1 to 35, except for Comparative Example 2, the coefficient of variation CV was 0.205 or more. In Comparative Example 2, although the coefficient of variation CV was as small as 0.200, the average value x of the diffusion area was 210 mm ² , which was larger than any of Examples 1-15. From these results, the paper diapers of Examples 1 to 15, as compared with the paper diapers of Comparative Examples 1 to 35, have a smaller spread area for loose feces, a smaller variation in the diffusion area, and stably suppress leakage of loose feces. I know there is.

== Hardness ==
[Examples 16 and 17]
In Example 16, the paper diaper 100 of Example 1 was changed, as shown in Table 2 below, in various parameters relating to the concave portions 70 . In addition, Example 17 was prepared by changing various parameters related to the concave portion 70 from the paper diaper 200 of Example 10 as shown in Table 2 below. As shown in Table 2, in Examples 16 and 17, the inner volume Va of the circle, the longitudinal area Ay, and the width area Ax are all values within the above ranges, and the first inclined portion and the second inclined portion in the circular region 10A described above. The maximum length Lmax of the two inclined portions is 40 mm (lower limit specified above). In Examples 16 and 17, each inclination angle θ of the first inclined portion and the second inclined portion with respect to the longitudinal direction, the width W and the depth D described above are values within the above ranges.

[Examples 18 to 21]
In contrast to Examples 16 and 17, Examples 18 and 19 were obtained by setting the maximum length Lmax to 60 mm, which conforms to the above regulation. Further, in contrast to Examples 16 and 17, Examples 20 and 21 were obtained by setting the maximum length Lmax to 80 mm, which conforms to the above regulation. As shown in Table 2, the inner volume Va, longitudinal area Ay, and width area Ax of Examples 18 and 20 are the same as those of Example 16, and the inner volume Va of Examples 19 and 21 are the same. , the longitudinal area Ay and the width area Ax are the same as those in the 17th embodiment. Also, in Examples 18 to 21, the respective inclination angles θ of the first inclined portion and the second inclined portion with respect to the longitudinal direction, and the width W and the depth D described above are values within the above ranges.

[Comparative Examples 36 to 39]
Compared to Examples 16 and 17, Comparative Examples 36 and 37 were obtained by setting the maximum length Lmax to 10 mm, which is outside the above-mentioned regulation. Comparative Examples 38 and 39 were obtained by setting the maximum length Lmax to 30 mm, which is out of the above range, in comparison with Examples 16 and 17. Incidentally, as shown in Table 2, the inner volume Va of the circle, the longitudinal area Ay, and the width area Ax of Comparative Examples 36 and 38 are the same as those of Example 16, and the inner volume Va of the circle of Comparative Examples 37 and 39 are the same as those of Example 16. , the longitudinal area Ay and the width area Ax are the same as those in the 17th embodiment.

[Evaluation method]
The paper diapers of Examples 16 to 21 and Comparative Examples 36 to 39 were subjected to the following tests and judgments to evaluate hardness.

<Test>
Ten subjects performed the following two types of sensory tests (tests 1 and 2).
Test 1: The side facing the skin of the disposable diapers of each example and comparative example was palpated to evaluate whether or not the presence of the superabsorbent polymer (crumple feeling) was felt.
Test 2: The skin-facing side of each of the paper diapers of Examples and Comparative Examples and the comparative samples of these paper diapers without recesses was palpated, and the paper diapers of each Example and Comparative Example were compared with the comparative samples. It was evaluated whether or not it felt hard.

<judgment>
Based on the number of subjects Np who answered that they "feel the presence of the superabsorbent polymer" in Test 1, the hardness (hardness 1) of the disposable diapers of each example and comparative example was evaluated in three stages (○, △, x).
○ (good): Np ≤ 1
△ (Possible): 2≦Np≦5
× (impossible): 6≦Np

Similarly, based on the number of subjects Ns who responded that they felt "harder than the comparative sample" in Test 2, the hardness (hardness 2) of the paper diapers of each example and comparative example was evaluated in three stages as follows (○ , △, ×).
○ (good): Ns ≤ 1
△ (Possible): 2≦Ns≦5
× (impossible): 6≦Ns

〔Evaluation results〕
The evaluation results of hardness 1 and 2 by the evaluation method described above are shown in Table 2 below together with various parameters (circle inner volume Va, longitudinal area Ay, width area Ax, maximum length Lmax) of each example and comparative example. show.

As is clear from Table 2, the paper diapers of Examples 16 to 21 had higher hardness evaluations than the paper diapers of Comparative Examples 36 to 39 in both of the two sensory tests (tests 1 and 2). rice field. From these results, it can be seen that the paper diapers of Examples 16 to 21 have a softer feel and are more comfortable to wear and fit than the paper diapers of Comparative Examples 36 to 39.

== Hardness, Breathability ==
[Examples 22 and 23]
Example 22 was prepared by changing various parameters related to the concave portion 70 from the paper diaper 100 of Example 1 as shown in Table 3 below. In addition, Example 23 was prepared by changing various parameters related to the concave portion 70 from the paper diaper 200 of Example 10 as shown in Table 3 below. As shown in Table 3, in Examples 22 and 23, the inner volume Va, the longitudinal area Ay, and the width area Ax are all within the above ranges, and the interval M1 of the first inclined portion 71 and the second Both the intervals M2 of the two inclined portions 72 are 10 mm (the lower limit of the above range). In Examples 22 and 23, each inclination angle θ of the first inclined portion 71 and the second inclined portion 72 with respect to the longitudinal direction, and the width W and the depth D described above are values within the above ranges.

[Examples 24 to 27]
In contrast to Examples 22 and 23, Examples 24 and 25 were obtained by setting the distances M1 and M2 to 30 mm, which is a value within the above range. Further, in contrast to Examples 22 and 23, Examples 26 and 27 were obtained by setting the distances M1 and M2 to 40 mm, which is the upper limit value of the above range. Incidentally, as shown in Table 3, the inner volume Va of the circle, the longitudinal area Ay, and the width area Ax of Examples 24 and 26 are the same as those of Example 22, respectively, and the inner volume Va of the circle of Examples 25 and 27. , the longitudinal area Ay, and the width area Ax are the same as those in Example 23, respectively. Also, in Examples 24 to 27, each inclination angle θ of the first inclined portion and the second inclined portion with respect to the longitudinal direction, and the width W and the depth D described above are values within the above ranges.

[Comparative Examples 40 to 43]
Comparative Examples 40 and 41 were obtained by setting the distances M1 and M2 to 5 mm, which is lower than the above range, in Examples 22 and 23, respectively. Further, comparative examples 42 and 43 were obtained by setting the distances M1 and M2 to 50 mm, which is larger than the range described above, compared to examples 22 and 23, respectively. Incidentally, as shown in Table 3, the inner volume Va of the circle of Comparative Examples 40 and 42, the longitudinal area Ay, and the width area Ax of Comparative Examples 40 and 42 are the same as those of Example 22, respectively, and the inner volume Va of the circle of Comparative Examples 41 and 43 , the longitudinal area Ay, and the width area Ax are the same as those in Example 23, respectively.

[Evaluation method]
The hardness of each of the paper diapers of Examples 22-27 and Comparative Examples 40-43 was evaluated by the evaluation method described above. Further, the paper diapers of Examples 22 to 27 and Comparative Examples 40 to 43 were subjected to the following tests and judgments to evaluate air permeability.

<Test>
The paper diapers of each example and comparative example were unfolded to expose the skin facing side of the laminate and fixed to a drawing board to obtain samples for evaluation. Then, while blowing 8 liters of air per minute to the intersections of the grid-like recesses provided in the evaluation sample, the pressure (airflow resistance) P at the intersections was measured with a pressure gauge.

<judgment>
Based on the pressure P measured by the pressure gauge, the propriety of air permeability (◯, x) of the paper diapers of each example and comparative example was determined as follows.
○ (Possible): P<400Pa
× (impossible): 400 Pa ≤ P

〔Evaluation results〕
The hardness and air permeability evaluation results obtained by the evaluation method described above are shown in Table 3 below together with the parameters of each example and comparative example (circular volume Va, longitudinal area Ay, width area Ax, intervals M1 and M2). .

As is clear from Table 3, the paper diapers of Examples 22 to 27 were excellent in hardness 1 and 2 and air permeability. On the other hand, the paper diapers of Comparative Examples 40 and 41, in which the intervals M1 and M2 are below the above range, are both evaluated as "x" for hardness 1 and 2, and the paper diapers of Comparative Examples 42 and 43, in which the intervals M1 and M2 are above the above range. The evaluation of the air permeability of the paper diaper was "x". From this result, when the intervals M1 and M2 are less than the above range, the paper diaper feels hard, and when the intervals M1 and M2 exceed the above range, the breathability of the paper diaper decreases. , good tactile sensation and breathability can be realized in the paper diaper, excellent wearing comfort and fit can be obtained, and it can be seen that stuffiness in the worn state can be suppressed.

In the air permeability test described above, the pressure P (both less than 400 Pa) measured on the paper diapers of Examples 22 to 27 was measured on the paper diapers (comparative samples) from Examples 22 to 27 without recesses. It was less than half the value of the pressure P that was used. From these results, it can be said that the paper diapers of Examples 22 to 27 have a markedly improved breathability due to the presence of the concave portions, and can be said to have a good effect of suppressing stuffiness in the worn state.

2 front body 3 crotch part 4 back body 5 front side flap 6 rear side flap 10 laminate 10A circular area 11 anus facing part 20 absorbent body 21 absorbent core 21A bank part 24 wrap sheet 31 top sheet 32 back sheet 33 side sheet 35 Cover sheet 38 patches (front patch)
41-43 Gather 51-53 Thread rubber (elastic member)
60 tape (fastening tape)
70 concave part 71 first inclined part 72 second inclined part 100, 200 disposable diaper A cross-sectional area Ax width area Ay longitudinal area CV coefficient of variation D depth L length Lmax maximum length M1, M2 interval S space Va inner volume W width x average XL, YL straight line σ standard deviation

Claims (5)

A laminate having an absorbent body and a liquid-permeable top sheet disposed on the surface of the absorbent body facing the skin,
A groove-like concave portion extends in a grid shape on the skin-facing surface side of the laminate,
The concave portion is inclined at an angle of −45°±10° with respect to the longitudinal direction of the laminate, and a plurality of first inclined portions are inclined at an angle of 45°±10° with respect to the longitudinal direction of the laminate. having a plurality of second sloping portions that intersect with the first sloping portion;
Each width of the first inclined portion and the second inclined portion is 1.5 mm or more and 5 mm or less,
Each depth of the first inclined portion and the second inclined portion is 1.5 mm or more and 15 mm or less,
The volume of the recess, which is included in a circular area with a diameter of 100 mm defined so as to center on the anus-facing part facing the anus of the wearer, is 5 cm ³ or more and 10 cm ³ or less,
In a cross section extending in the longitudinal direction and including the anus-facing portion, the total cross-sectional area of the recess is 40 mm ² or more and 100 mm ² or less,
In a cross section extending in the width direction of the laminate and including the anus-facing portion, the recess has a total cross-sectional area of 30 mm ² or more and 40 mm ² or less ,
The circular area is provided with at least one first slope and at least one second slope having a length of 40 mm or more and 80 mm or less.
An absorbent article characterized by: A laminate having an absorbent body and a liquid-permeable top sheet disposed on the surface of the absorbent body facing the skin,
A groove-like concave portion extends in a grid shape on the skin-facing surface side of the laminate,
The concave portion is inclined at an angle of −45°±10° with respect to the longitudinal direction of the laminate, and a plurality of first inclined portions are inclined at an angle of 45°±10° with respect to the longitudinal direction of the laminate. having a plurality of second sloping portions that intersect with the first sloping portion;
Each width of the first inclined portion and the second inclined portion is 1.5 mm or more and 5 mm or less,
Each depth of the first inclined portion and the second inclined portion is 1.5 mm or more and 15 mm or less,
The volume of the concave portion included in a circular area with a diameter of 100 mm defined so as to center on the anal-facing portion facing the wearer's anus is 10 cm ³ or more and 15 cm ³ or less,
In a cross section extending in the longitudinal direction and including the anus-facing portion, the recess has a total cross-sectional area of 30 mm ² or more and 40 mm ² or less,
In a cross section extending in the width direction of the laminate and including the anus-facing portion, the recess has a total cross-sectional area of 30 mm ² or more and 40 mm ² or less ,
Both the interval of the first inclined portion and the interval of the second inclined portion are 10 mm or more and 40 mm or less,
An absorbent article characterized by: The recess is provided in a region of the laminate where the absorber is present,
A bank portion protruding toward the skin-facing surface side of the recess is provided on the outer side of the recess in the width direction of the absorbent body,
The absorbent article according to claim 1 or 2 . One of the lattices formed by the concave portion is provided so as to surround the anus-facing portion.
The absorbent article according to any one of claims 1-3 . The recess is a pressed portion in which the laminate is pressed in the thickness direction,
The absorbent article according to any one of claims 1-4 .

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