JP2021062175A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which has high bond strength between core wrap sheets and hardly causes breakage of an absorber during wearing in the absorbent article which has a slit part formed in an absorbent core and includes the absorber in which the core wrap sheets facing through the slit part are bonded to each other.SOLUTION: In a range overlapped with a slit part 15 in a plane view, one layer of a non-woven fabric formed of a skin side core wrap sheet 12 is located on a skin facing surface side of the slit part 15, and two layers of a non-woven fabric formed of a non-skin side core wrap sheet 13 are located on a non-skin facing surface side of the slit part 15. In the slit part 15, a fusion part 16 where three layers of the non-woven fabric are mutually fused is located.SELECTED DRAWING: Figure 4

Description

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

Absorbent articles such as disposable diapers are generally placed between a front sheet that is relatively close to the wearer's skin and a back sheet that is relatively far from the wearer's skin. It is provided with an absorber that intervenes in. The absorber is typically composed of an absorbent core mainly composed of a water-absorbent material such as wood pulp, and a core wrap sheet that covers the outer surface of the absorbent core. The absorber is placed at the excretion position of body fluid such as urine. Conventionally, for the purpose of improving the diffusivity of body fluid in the anteroposterior direction of the wearer from the excretion position, the absorbent core is penetrated in the thickness direction in the portion corresponding to the excretion position in the absorbent core in the anteroposterior direction of the wearer. It is known to form a slit portion extending to (Patent Documents 1 to 3).

In the absorbent article described in Patent Document 1, one non-woven fabric layer is arranged as a core wrap sheet on the skin-facing surface side of the absorbent core in which the slit portion is formed, and the absorbent core is non-skin-facing. On the surface side, as a core wrap sheet, a connecting portion in which two non-woven fabric layers are connected via a hot melt adhesive is arranged, and the one-layer non-woven fabric layer and the connecting portion facing each other via the slit portion are arranged. Is bonded via a hot melt adhesive. According to the absorbent article described in Patent Document 1, the connecting portion acts as a spacer for maintaining the distance between the slit portions, and it is said that the crushing of the slit portions during wearing can be suppressed.

In the absorbent article described in Patent Document 2, one layer of the upper layer side core wrap sheet is arranged on the skin facing surface side of the absorbent core in which the slit portion is formed, and on the non-skin facing surface side of the absorbent core. By arranging the lower layer side core wrap sheet of one layer and embossing the slit portion from the skin facing surface side of the upper layer side core wrap sheet, these two layers of core wrap sheets are integrated in the slit portion. It has been transformed. According to the absorbent article described in Patent Document 2, the shape of the slit portion is maintained, and it is possible to prevent the absorber from being twisted or cracked.

In the absorbent article described in Patent Document 3, a reinforcing adhesive layer is provided in a region overlapping the slit portion (concave groove) formed in the absorber on the non-skin facing surface side of the absorber, and the absorbent is absorbed. A bonding adhesive layer for bonding the absorber and the back surface sheet is provided in a region other than the reinforcing adhesive layer on the non-skin facing surface side of the body. According to the absorbent article described in Patent Document 3, it is said that the action of the reinforcing adhesive layer can prevent the slit portion from being crushed or deformed due to leg pressure or the like while wearing the absorbent article.

JP-A-2017-64134 Japanese Unexamined Patent Publication No. 2016-174741 Japanese Unexamined Patent Publication No. 2015-119922

As described above in Patent Documents 1 to 3, a core wrap sheet arranged on the skin-facing surface side of the absorbent core and a core wrap sheet arranged on the non-skin facing surface side are provided on the absorbent core. A technique for joining by fusion with an adhesive or embossing through a slit portion is described. However, in these conventional techniques, since the joint strength between the core wrap sheets in the slit portion is not sufficient, the joint portion between the core wrap sheets in the slit portion is destroyed by the swelling caused by the absorption of liquid in the absorbent core. There was a risk of inducing breakage of the absorber.

Therefore, an object of the present invention is to join the core wrap sheets to each other in an absorbent article having an absorber in which a slit portion is formed in the absorbent core and the core wrap sheets facing each other are joined to each other through the slit portion. It relates to providing an absorbent article having high strength and less likely to break the absorber during wearing.

The present invention has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the crotch portion. An absorber that is divided into a ventral portion arranged on the ventral side of the wearer and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion, and extends in the vertical direction through the crotch portion. It is an absorbent article comprising.
In one embodiment of the absorbent article of the present invention, the absorber comprises an absorbent core that absorbs and retains body fluids, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and the absorbent core. It is composed of a non-skin side core wrap sheet that covers the non-skin facing surface of the above.
In one embodiment of the absorbent article of the present invention, both core wrap sheets are made of a non-woven fabric.
In one embodiment of the absorbent article of the present invention, the absorbent core is formed with a slit portion that penetrates the absorbent core in the thickness direction and extends in the vertical direction.
In one embodiment of the absorbent article of the present invention, in a region overlapping the slit portion in a plan view, one non-woven fabric layer made of the skin-side core wrap sheet is present on the skin-facing surface side of the slit portion, and is also present. Two non-woven fabric layers made of the non-skin side core wrap sheet are present on the non-skin side facing surface side of the slit portion.
In one embodiment of the absorbent article of the present invention, the slit portion has a fused portion in which the three non-woven fabric layers are fused to each other.
Other features, effects and embodiments of the present invention are described below.

According to the present invention, in an absorbent article having an absorbent body in which a slit portion is formed in the absorbent core and the core wrap sheets facing each other are bonded to each other through the slit portion, the bonding strength between the core wrap sheets is provided. An absorbent article is provided which is high in strength and is less likely to break the absorber during wearing.

FIG. 1 is a developed plan view schematically showing a skin-facing surface side (surface sheet side) in an unfolded and stretched state of a deployable disposable diaper according to an embodiment of the absorbent article of the present invention. The "expanded and stretched state" here means that the diaper is in the unfolded state as shown in FIG. 1, and the elastic member of each part is stretched to extend the diaper in the unfolded state to eliminate the influence of the elastic member at all. It refers to the state in which it is expanded to the same size as when it is expanded in a flat state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line I-I of FIG. 1 (a cross section when cut in the lateral direction along the thickness direction). FIG. 3 is a plan view schematically showing the skin-facing surface side of the absorber in the diaper shown in FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II-II of FIG. 3 (a cross section when cut in the lateral direction along the thickness direction). FIG. 5 is a plan view schematically showing an example of the slit portion according to the present invention.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The absorbent article (diaper 1) has a vertical direction (X) corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side through the crotch portion, and a lateral direction orthogonal to the vertical direction (X). (Y) and. In the following description, unless otherwise specified, the vertical direction (X) is a direction along the vertical direction (X) of the absorbent article or the vertical direction (X) in its constituent members (for example, an absorber), and is a horizontal direction (X). X) is a direction along the lateral direction (X) of the absorbent article or the lateral direction (X) in the constituent members thereof.
The absorbent article (diaper 1) is arranged in the crotch part of the wearer, and includes the inseam (B) including the excretion part facing part (not shown) facing the excretion part such as the wearer's penis, and the inseam. The ventral part (A) arranged on the ventral side (front side) of the wearer from (B) and the dorsal part (A) arranged on the dorsal side (rear side) of the wearer from the inseam (B). It is divided into three categories, C) and.
1 and 2 show a disposable diaper 1 which is an embodiment of the absorbent article of the present invention, and the diaper 1 has the above-described configuration.

The diaper 1 is a so-called deployable disposable diaper, and a fastening member 8 having a fastening portion 7 is provided on both side edges of the dorsal side portion C of the diaper 1 along the vertical direction X, and a ventral side portion. A fastening region 9 to which the fastening portion 7 can be fastened is provided on the non-skin facing surface of A.

The diaper 1 includes an absorber 10 extending in the vertical direction X through the inseam B. The absorber 10 absorbs and retains body fluids such as urine excreted by the wearer of the diaper 1. In the present embodiment, the diaper 1 includes an absorbent main body 2 provided with an absorbent body 10 and a flap portion 5 extending outward from the peripheral edge of the absorbent main body 2.

The absorbent body 2 includes a liquid-permeable front surface sheet 3 that forms a skin-facing surface, a liquid-impermeable or liquid-impermeable or water-repellent back surface sheet 4 that forms a non-skin-facing surface, and both sheets 3 and 4. It is provided with a liquid-retaining absorber 10 interposed between them, and these are integrated by a known joining means such as an adhesive. The absorbent body 2 extends in the longitudinal direction X from the ventral side A to the dorsal side C. As the front surface sheet 3 and the back surface sheet 4, those conventionally used for this kind of absorbent article can be used without particular limitation. As the surface sheet 3, for example, various non-woven fabrics and perforated films can be used. As the back sheet 4, for example, a resin film or a laminate of a resin film and a non-woven fabric can be used.

In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an absorber) that is directed toward the wearer's skin side when the absorbent article is worn, that is, the wearer's skin relatively. The "non-skin facing surface" is the surface of the absorbent article or its constituents that is directed away from the skin side when the absorbent article is worn, that is, relatively far from the wearer's skin. On the side. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained. In FIGS. 2 and 4 (cross-sectional views along the thickness direction) of the present application, the upper surface (relatively upper surface) of each component (for example, the absorber 10) is the skin-facing surface and the lower surface (relatively lower). The surface located at) is the non-skin facing surface.

The flap portion 5 is composed of a member extending outward from the peripheral edge of the absorbent main body 2, and is a non-arranged portion of the absorbent body 10. In the present embodiment, as shown in FIG. 2, the front surface sheet 3 covers the entire skin-facing surface of the absorber 10, and the back surface sheet 4 covers the entire non-skin-facing surface of the absorber 10. The sheets 3 and 4 further extend outward in the horizontal direction Y from both side edges of the absorbent main body 2 along the vertical direction X, and together with the leakage-proof cuff forming sheet 60 described later, a part of the flap portion 5 (absorbent main body). Both side edges along the vertical direction X of 2 and side flap portions extending outward in the horizontal direction Y from the virtual extension lines of the both side edges) are formed. The plurality of members constituting the flap portion 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal.

As shown in FIGS. 1 and 2, leak-proof cuffs 6 that stand up toward the wearer's skin side when worn are arranged along both side portions of the absorbent body 2 along the vertical direction X. More specifically, a pair of sheets 60 for forming a leak-proof cuff that is liquid-resistant, water-repellent, and breathable are included on both sides of the absorbent body 2 on the skin-facing surface along the vertical direction X. Leakage-proof cuffs 6 and 6 are arranged. In each of the pair of leak-proof cuff forming sheets 60, 60, one end side in the lateral direction Y is fixed to another member (front sheet 3 and back surface sheet 4 in the illustrated embodiment), and the fixed end portion and the lateral direction Y, respectively. The other end side is a free end portion that is not fixed to another member, and a thread-like or band-shaped elastic member 61 for forming a leak-proof cuff is arranged at the free end portion so as to be expandable and contractible in the vertical direction X. When the diaper 1 is worn, due to the contraction force of the elastic member 61 for forming the leak-proof cuff, at least in the inseam B, the free end side of the sheet 60 for forming the leak-proof cuff raises the fixing portion 62 with other members. The standing of the leak-proof cuff 6 prevents the outflow of excrement such as urine to the outside in the lateral direction Y.

A plurality of thread-like or band-shaped elastic members 51 for forming gathers around the waist can be expanded and contracted in the lateral direction at the flap portion 5 at the end portion of each of the ventral side portion A and the dorsal side portion C in the longitudinal direction X, that is, the waist end portion. The plurality of elastic members 51 are arranged intermittently at predetermined intervals in the vertical direction X. The waist end is joined to the sheets (front sheet 3 and back sheet 4 in this embodiment) constituting the waist end by means of joining means such as an adhesive in a state where the elastic member 51 is extended in the lateral direction Y. After that, the elastic member 51 is released from the stretched state. When the diaper 1 is worn, the elastic member 51 contracts to form a substantially continuous annular waist circumference gather at the waist end. Further, in the flap portion 5, the leg portion arranged around the wearer's leg when the diaper 1 is worn has an elastic member 52 for forming leg gathers that can extend in the vertical direction X at least in the vertical direction X of the inseam B. It extends in the vertical direction X over the entire length of. The leg portion is a means for joining an adhesive or the like to a sheet (the leak-proof cuff forming sheet 60 and the back surface sheet 4 in the present embodiment) constituting the leg portion in a state where the elastic member 52 is extended in the vertical direction X. It is manufactured by releasing the elastic member 52 from the stretched state after joining with the above. When the diaper 1 is worn, leg gathers are formed on the leg portion due to the contraction of the elastic member 52.

As shown in FIGS. 3 and 4, the absorber 10 includes an absorbent core 11 that absorbs and retains body fluid, a skin-side core wrap sheet 12 that covers the skin-facing surface of the absorbent core 11, and the absorbent core. It is configured to include a non-skin side core wrap sheet 13 that covers the non-skin facing surface of 11. In the present embodiment, the absorbent core 11 has an hourglass shape in which the central portion of the vertical direction X located at the inseam B is constricted in a plan view as shown in FIG. 3, and has a long shape in the vertical direction X. There is.

The absorbent core 11 is a member that is the main component of the absorbent body 10, and is configured to include a water-absorbent material. Examples of the water-absorbent material include water-absorbent fibers and water-absorbent polymers, and one of these can be used alone or in combination of two or more. The absorbent core 11 typically consists of a fiber assembly containing water-absorbent fibers, or is in the form of the fiber aggregate holding a particulate water-absorbent polymer.

Examples of the water-absorbent fiber include wood pulp such as coniferous pulp and broadleaf pulp, natural fiber such as non-wood pulp such as cotton pulp and hemp pulp; and modified pulp such as cationized pulp and marcelled pulp (these are cellulosic fibers). ); Hydrophilic synthetic fibers and the like can be mentioned, and one of these can be used alone or in combination of two or more. The water-absorbent fiber contained in the absorbent core 11 is typically a cellulosic fiber.

As the water-absorbent polymer, a particulate polymer is generally used, but a fibrous polymer may also be used. The shape of the particulate water-absorbent polymer is not particularly limited, and may be, for example, spherical, lumpy, bale-shaped, or indefinite. The water-absorbent polymer is typically composed mainly of a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid. Examples thereof include polyacrylic acid and salts thereof, and polymethacrylic acid and salts thereof. Specifically, acrylic acid polymers such as Aquaric CA and Aqualic CAW (both manufactured by Nippon Catalyst Co., Ltd.) Partial sodium salts can be mentioned.

The skin-side core wrap sheet 12 and the non-skin-side core wrap sheet 13 are each made of a non-woven fabric. Paper may be used as this type of core wrap sheet, but in general, non-woven fabric has a higher breaking elongation than paper and is therefore not easily torn even if the absorbent core 11 is deformed, so that it is useful as a core wrap sheet. is there. As the non-woven fabric constituting both core wrap sheets 12 and 13, those having water permeability are preferable, and for example, an air-through non-woven fabric, a heat roll non-woven fabric, a spunlace non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, and a spun bond-melt blown-spun bond ( SMS) Non-woven fabric can be mentioned. These non-woven fabrics may be hydrophilic non-woven fabrics made of fibers that have been subjected to a hydrophilic treatment.

Both core wrap sheets 12 and 13 may be 1) one continuous sheet or 2) separate sheets. In the case of 1) above, for example, one continuous core wrap sheet having a width of 2 times or more and 3 times or less the length of the absorbent core 11 in the lateral direction Y can be used. In the case of 2) above, the skin-side core wrap sheet 12 and the non-skin-side core wrap sheet 13 may have the same material (type of non-woven fabric), basis weight, size in plan view, etc., or may differ from each other. Good.

In the present embodiment, the above 1) is adopted as the embodiment of both core wrap sheets 12 and 13. Specifically, as shown in FIG. 4, one core wrap sheet covers the entire surface of the absorbent core 11 facing the skin, and the absorbent core 11 has a lateral edge from both sides along the vertical direction X to the lateral direction Y. The extension portion extends below the absorbent core 11 and covers the entire non-skin facing surface of the absorbent core 11. In this one core wrap sheet, the portion covering the skin facing surface of the absorbent core 11 is the skin side core wrap sheet 12, and the portion covering the non-skin facing surface of the absorbent core 11 is the non-skin side core wrap sheet 13. Is.

As shown in FIGS. 1 to 4, the absorbent core 11 is formed with a slit portion 15 that penetrates the absorbent core 41 in the thickness direction and extends in the vertical direction X. The slit portion 15 is a groove having no bottom portion, and is typically a region in which a material for forming an absorbent core such as a water-absorbent material does not exist. However, there may be a case where the absorbent core forming material is present in the slit portion 15 because the absorbent core forming material that has fallen off from the peripheral portion enters the slit portion 15. In such a case, the basis weight of the material for forming the absorbent core in the slit portion 15 is lower than that of the peripheral portion (for example, a region within 10 mm in the vertical direction X or the horizontal direction Y from the slit portion 15), for example, the peripheral portion. It is preferably 20% or less, more preferably 10% or less, based on the basis weight of.

The slit portion 15 contributes to a reduction in discomfort when the diaper 1 is worn, an improvement in liquid uptake and diffusivity, and the like. That is, the slit portion 15 functions as a deformation guiding portion (flexible shaft) when the absorbent core 11 provided with the slit portion 15 is deformed by being bent by receiving an external force such as body pressure, whereby the absorbent body 10 of the slit portion 15 functions. Deformation along the body shape of the wearer is promoted, and as a result, the discomfort when wearing the diaper 1 can be reduced, and the wearing feeling and fit can be improved. Further, the slit portion 15 functions as a flow path for excrement such as urine to be absorbed by the absorber 10, promotes diffusion of the excrement in the surface direction, and contributes to effective utilization of the liquid absorption performance of the absorber 10. obtain. Since the slit portion 15 plays such a role, it is preferable that the slit portion 15 is arranged in a portion of the absorbent core 11 that is easily subjected to an external force such as body pressure and in which excrement is easily concentrated. From such a viewpoint, it is preferable that the slit portion 15 is arranged at a portion of the absorbent core 11 located at the crotch portion B.

In the present embodiment, as shown in FIG. 1, a plurality of slit portions 15 are intermittently arranged in the crotch portion B in the lateral direction Y. More specifically, the slit portion 15 of the present embodiment is symmetrical with respect to the horizontal center line CLy extending in the vertical direction X by bisecting the expanded and extended diaper 1 or the absorbent core 11 in the horizontal direction Y. It is formed in pairs on both sides of the horizontal center line CLy. Each of the pair of slit portions 15 has a shape long in the vertical direction X in a plan view, specifically, a rectangular shape. The slit portion 15 may extend from the lower crotch B to the ventral side A, or may extend from the lower crotch B to the dorsal side C.

The length 15L of the slit portion 15 in the vertical direction X (see FIG. 3) is 20 to 70%, particularly 30 to 60% of the length (total length) of the absorber 10 or the absorbent core 11 in the vertical direction X. Is preferable. For example, when the total length of the absorber 10 or the absorbent core 11 in the vertical direction X is 370 mm, the length 15L of the slit portion 15 in the vertical direction X may be 140 mm.
The length or width 15W of the slit portion 15 in the lateral direction Y (see FIG. 3) may be 2 to 20% of the maximum length or width of the absorbent core 11 in the lateral direction Y, particularly 4 to 10%. preferable. For example, when the maximum width of the absorbent core 11 is 120 mm and the minimum width of the constricted portion 11N (see FIG. 3) of the absorbent core 11 is 70 mm, the width 15 W of the slit portion may be 5 mm.

The constricted portion 11N is a portion of the absorbent core 11 having a shorter width (length in the lateral direction Y) than a portion located in the front-rear direction with the portion (constricted portion 11N) interposed therebetween. In the present embodiment, as shown in FIG. 3, the constricted portion 11N has a minimum width portion 11Na in which the width is not constant over the entire length of the constricted portion 11N in the vertical direction X and the width is the minimum. The minimum width portion 11Na is located at least in the inseam B.

In the present embodiment, a plurality of slit portions 15 intermittently arranged in the horizontal direction Y and a plurality of minimum width portions 11Na of the absorbent core 11 are equally divided in the horizontal direction Y and substantially extended in the vertical direction X. There is a one-to-one correspondence with a straight line (hereinafter, also referred to as a "minimum width equally divided straight line"). The term "one-to-one correspondence" as used herein means that one slit portion 15 is located on one of the minimum width portion equally divided straight lines, or is 5 mm from one of the minimum width portion equally divided straight lines. It means that it is located in the area within. Further explaining with reference to FIG. 3, in the present embodiment, a pair, that is, two slit portions 15 are intermittently arranged in the lateral direction Y, and the center of each of the two slit portions 15 in the lateral direction Y. The horizontal center lines (not shown) of the two slit portions that virtually extend in the vertical direction X through the slit portion are equally divided straight lines of the minimum width portion, and the minimum width portion 11Na of the absorbent core 11 is substantially 3 in the horizontal direction Y. It is divided into equal parts. By arranging the slit portion 15 in this way in relation to the minimum width portion 11Na, the action and effect of the slit portion 15 can be more reliably achieved. For example, when the width of the minimum width portion 11Na (the length in the lateral direction Y) is 70 mm, the lateral center lines of the two slit portions (the minimum width portion equally divided straight lines) adjacent to each other in the lateral direction Y are lateral to each other. The distance in the direction Y is preferably 23 mm.

In the present invention, the number of slit portions 15 is not particularly limited, and may be one or three or more. Further, the plurality of slit portions 15 do not have to be formed symmetrically with respect to the horizontal center line CLi. Further, the plurality of slit portions 15 may have different shapes and dimensions in a plan view. Further, in the present embodiment, the length (width) of the slit portion 15 in the lateral direction Y is constant over the entire length of the slit portion 15 in the vertical direction X (longitudinal direction), but may not be constant.

The absorbent core 11 can be manufactured according to a conventional method using a known fiber stacking device equipped with a rotating drum. The fiber stacking device typically has a rotating drum in which an accumulation recess is formed on the outer peripheral surface, and a flow path inside which conveys a core forming material (water-absorbent fiber, water-absorbent polymer) to the accumulation recess. The core is provided with a duct, and while rotating the rotating drum around a rotation axis along the circumferential direction of the drum, the core is carried on an air flow generated in the flow path by suction from the inside of the rotating drum. The forming material is made to be stacked in the accumulation recess. The fiber stack formed in the accumulation recess by the fiber stacking process is the absorbent core 11. The absorbent core 11 can be said to be a fiber stack of the core forming material. The slit portion 15 is a portion formed by intentionally inhibiting the stacking of the forming material in the fiber stacking step. The absorbent core 11 having the slit portion 15 has a portion corresponding to the slit portion 15 at the bottom of the accumulation recess as the accumulation recess, which protrudes outward in the radial direction of the rotating drum as compared with the peripheral portion. It can be manufactured by using a thing. In the absorbent core 11 obtained by such a method, the portion where the forming material does not exist or exists at a lower basis weight than the peripheral portion is the slit portion 15.

In the absorber 10, as shown in FIG. 4, in the region overlapping the slit portion 15 in a plan view, one non-woven fabric layer made of the skin-side core wrap sheet 12 is present on the skin-facing surface side of the slit portion 15 and the slit. Two non-woven fabric layers made of the non-skin side core wrap sheet 13 are present on the non-skin side facing surface side of the portion 15. In FIG. 4, the portion indicated by reference numeral 130 is a portion in which two non-woven fabric layers made of the non-skin side core wrap sheet 13 exist (hereinafter, also referred to as “two-layer portion”). Then, in the slit portion 15, the three layers of the non-woven fabric layer, that is, the two-layer non-woven fabric layer composed of the one-layer non-woven fabric layer composed of the skin-side core wrap sheet 12 and the non-skin-side core wrap sheet 13 (two-layer portion 130). There is a fused portion 16 in which a total of three layers are fused to each other.

The fused portion 16 can be formed by performing a pressing process involving melting of the constituent fibers of both core wrap sheets 12 and 13 at the formation position of the slit portion 15 in the absorber 10. Both core wrap sheets 12 and 13 are made of a non-woven fabric as described above, and the constituent fibers thereof are typically synthetic fibers made of a synthetic resin such as a thermoplastic resin. As the squeezing process, a known method can be used without particular limitation, and examples thereof include heat-embossing process and ultrasonic embossing process.

In the present embodiment, as shown in FIG. 4, the two-layer portion 130 has a plurality of (two in the illustrated embodiment) slit portions 15 intermittently arranged in the lateral direction Y in the lateral direction Y in the lateral direction. It extends from a position that overlaps with the outermost object on one side of Y in a plan view to a position that overlaps with an outermost object on the other side in the lateral direction in a plan view. Therefore, in the present embodiment, there is a two-layer non-woven fabric layer (two-layer portion 130) made of the non-skin side core wrap sheet 13 in the region where the plurality of slit portions 15 adjacent to each other in the lateral direction overlap each other in a plan view. To do. Further, the two-layer portion 130 extends over the entire length of the absorbent core 11 in the vertical direction X in the vertical direction X. The two non-woven fabric layers (non-skin side core wrap sheet 13) constituting the two-layer portion 130 may be bonded to each other via an adhesive.

The diaper 1 is characterized in that it includes the absorber 10 having the above-described configuration. Particularly characteristic configurations include the following (1) and (2).
(1) The absorbent core 11 is formed with a slit portion 15 that penetrates the absorbent core 11 in the thickness direction and extends in the vertical direction X.
(2) A total of three layers, a one-layer non-woven fabric layer made of the skin-side core wrap sheet 12 and two layers of the non-woven fabric layer (two-layer portion 130) made of the non-skin-side core wrap sheet 13, are fused to each other in the slit portion 15. There is a fused portion 16 that has been attached.

By providing the diaper 1 with the above (1), the diaper 1 exerts an effect due to the function of the slit portion 15 described above. That is, since the slit portion 15 functions as a deformation guiding portion of the absorber 10, the absorber 10 on which the slit portion 15 is formed is easily deformed to follow the body shape of the wearer when the diaper 1 is worn. Diaper 1 is excellent in wearing comfort and fit. Further, since the slit portion 15 functions as a flow path for excrement such as urine, diffusion of excrement in the vertical direction X is promoted in the absorber 10 in which the slit portion 15 extending in the vertical direction X is formed. .. Therefore, the diaper 1 is excellent in the utilization efficiency of the absorber 10.

Further, since the diaper 1 is provided with the above (2), the bonding strength between the core wrap sheets 12 and 13 (nonwoven fabric layer) facing each other through the slit portion 15 is high, and the absorber 10 is broken during wearing. It's hard to do. In particular, in the diaper 1, since the three non-woven fabric layers are bonded to each other by fusion in the slit portion 15, the three non-woven fabric layers are bonded to each other by an adhesive instead of fusion (see Patent Document 1). Or, as compared with the case where two non-woven fabric layers are bonded to each other by fusion instead of three layers (see Patent Document 2), the bonding strength between the non-woven fabric layers is high, and the absorbent core 11 swells due to liquid absorption. However, the fused portion 16 is not easily broken, and the non-woven fabric layers (core wrap sheets 12 and 13) are not easily peeled off.

In particular, in the present embodiment, as shown in FIG. 4, as described above, the non-skin side core wrap sheet is formed in a region where the slit portions 15 adjacent to each other in the lateral direction Y (a pair in FIG. 4) overlap each other in a plan view. Since there are two layers of the non-woven fabric layer (two-layer portion 130) composed of 13, the effect of excellent liquid diffusivity is exhibited.

In the present embodiment, as shown in FIG. 4, the fused portion 16 is not the absorbent core 11 (the direction indicated by the reference numeral Z in the drawing) rather than the center of the absorbent core 11 (absorber 10) in the thickness direction. It is located on the side close to the skin facing surface (non-skin side core wrap sheet 13). In this way, locating the fused portion 16 on the non-skin facing surface side of the absorbent core 11 causes the formed position of the slit portion 15 in the absorber 10 in the pressing process for forming the fused portion 16. This can be achieved by pressing the skin-facing surface side toward the non-skin-facing surface side, that is, pressing the skin-side core wrap sheet 12 against the non-skin-side core wrap sheet 13. Since the fused portion 16 is relatively hard and uncomfortable to the touch, and has low liquid permeability and tends to remain once the liquid adheres, the fused portion 16 is located from the center of the absorbent core 11 in the thickness direction. However, if the absorbent core 11 is located on the side close to the skin-facing surface (skin-side core wrap sheet 12), there is a concern that inconveniences such as a decrease in touch and adhesion of body fluid to the skin may occur. On the other hand, in the present embodiment, such a concern is dispelled by the fact that the fused portion 16 is located on the non-skin facing surface side of the absorbent core 11.

It is preferable that there is no adhesive in the slit portion 15. There is no adhesive in the slit portion 15, and therefore, the core wrap sheets 12 and 13 (nonwoven fabric layers) facing each other via the slit portion 15 are fused without the adhesive, so that the fused portion 16 is fused. Strong bonding between the non-woven fabric layers can be obtained more reliably, and the liquid drawing property at the slit portion 15 can be further improved. Here, "the absence of an adhesive" means a very small amount that does not substantially affect the bonding strength between the non-woven fabric layers at the fused portion 16 and the liquid drawing property at the slit portion 15. The case where the adhesive is present in the slit portion 15 is included. That is, when the amount of the adhesive present in the slit portion 15 is such a very small amount, specifically, when the coating amount is preferably 2 g / m ² or less, more preferably 1 g / m ² or less, " There is no adhesive. "

The absorbent core 11, the skin-side core wrap sheet 12, and the non-skin-side core wrap sheet 13 are joined via an adhesive in a non-formed region of the slit portion 15 (a region that does not overlap with the slit portion 15 in a plan view). Is preferable. With such a configuration, the shape retention of the absorbent core 11 is further improved and absorbed, in combination with the fact that both core wrap sheets 12 and 13 are fused at the slit portion 15 at the fused portion 16. The breakage of the body 10 can be prevented more reliably. The type of adhesive is not particularly limited, and an absorbent article of this type that is usually used for joining members can be used without particular limitation, and examples thereof include a hot melt adhesive. Further, the application pattern of the adhesive is not particularly limited, and the adhesive is applied to the non-formed region of the slit portion 15 on each of the skin-facing surface side and the non-skin-facing surface side of the absorbent core 11 without any gap. (So-called solid coating) may be used, or the adhesive may be applied in an intermittent pattern such that the coated portion of the adhesive has a predetermined shape such as a striped shape, a spiral shape, an omega shape, or a dot shape in a plan view. May be good.

Regarding the bonding by the adhesive in the non-formed region of the slit portion 15 described above, when a plurality of slit portions 15 are intermittently arranged in the lateral direction Y as in the present embodiment, the shape retention of the absorbent core 11 is improved. From the viewpoint of improvement, the absorbent core 11, the skin-side core wrap sheet 12, and the non-skin-side core wrap sheet 13 are located between the slit portions 15 adjacent to each other in the lateral direction Y (the non-formed region of the slit portion 15). , It is preferable that they are joined via an adhesive. Further, the coating pattern of the adhesive may be solid coating, but a non-applied portion of the adhesive is provided between the slit portions 15 adjacent to each other in the lateral direction Y to ensure the liquid drawing property in the region. From the viewpoint of, an intermittent pattern is preferable.

Further, when a plurality of slit portions 15 are intermittently arranged in the lateral direction Y, an adhesive (applied to the skin facing surface of the absorbent core 11) between the absorbent core 11 and the skin side core wrap sheet 12. The amount of the adhesive) applied is such that the slit portions 15 located between the slit portions 15 adjacent to each other in the lateral direction Y (hereinafter, also referred to as “the area between the slit portions”) are located on the outermost side in the lateral direction Y. Between the outer region of the lateral direction Y, that is, the slit portion 15 located at the outermost side of the lateral direction Y and the side edge of the absorbent core 11 along the vertical direction X (hereinafter, "slit portion lateral outer side"). It is preferable that the amount is larger than that of the "region") in terms of further improving the shape retention of the absorbent core 11. The amount of the adhesive (adhesive applied to the non-skin facing surface of the absorbent core 11) between the absorbent core 11 and the non-skin side core wrap sheet 13 has the same magnitude relationship as described above, that is, " It is preferable that the region between the slit portions> the lateral outer region of the slit portion ”is established.

Between the absorbent core 11, the skin-side core wrap sheet 12, and the non-skin-side core wrap sheet 13, the amount of the adhesive applied in the region between the slits and the amount of the adhesive applied in the laterally outer region of the slits, respectively. The ratio is preferably 1.2 or more, more preferably 1.5 or more, and preferably 3 or less, more preferably 2.5 or less, as the former / the latter, assuming the former> the latter.
Between the absorbent core 11, the skin-side core wrap sheet 12, and the non-skin-side core wrap sheet 13, the amount of the adhesive applied in the region between the slits is preferably 5 g / m ² or more, more preferably 7 g / m. It is m ² or more, preferably 15 g / m ² or less, and more preferably 10 g / m ² or less.
The amount of the adhesive applied to the lateral outer region of the slit portion between the absorbent core 11, the skin-side core wrap sheet 12, and the non-skin-side core wrap sheet 13 is preferably 3 g / m ² or more, more preferably. It is 5 g / m ² or more, preferably 10 g / m ² or less, and more preferably 8 g / m ² or less.
In the present specification, "the amount of the adhesive applied" is the mass (basis weight) of the adhesive per unit area only for the portion to which the adhesive is applied, unless otherwise specified. It does not include the non-coated part.

In the present invention, the core wrap sheets 12 and 13 (nonwoven fabric layers) facing each other via the slit portion 15 may be joined over the entire area of the slit portion 15, and are joined only at a part of the slit portion 15. May be good. That is, the fused portion 16 may be present over the entire area of the slit portion 15, or may be present only in a part of the slit portion 15. FIG. 5 shows an example of the latter form.

In the slit portion 15A shown in FIG. 5, a plurality of rhombic-shaped fusion portions 16 in a plan view are arranged in a scattered pattern. The plan-view shape of the fused portion 16 is not particularly limited, and a circular shape, an elliptical shape, a triangular shape, a quadrangular shape, or the like can be arbitrarily selected. Further, the number of fused portions 16 arranged in the slit portion 15A is not particularly limited. ^{The area of each of the plurality of fused portions 16 is preferably 1 mm 2} or more, more preferably 1.5 mm ² or more, from the viewpoint of the balance between the bonding strength at the fused portion 16 and the liquid drawing property at the slit portion 15A. , And preferably 40 mm ² or less, more preferably 25 mm ² or less.

As shown in FIG. 5, one of the main features of the slit portion 15A is that the non-existing region 15X of the fused portion 16 exists at the end of the slit portion 15A in the vertical direction X. The non-existing region 15X is a region in which the fused portion 16 does not exist over the entire length of the slit portion 15A in the lateral direction Y. In the illustrated form, non-existing regions 15X exist at both ends of the slit portion 15A in the vertical direction X. The presence of the non-existing region 15X at the end of the slit portion 15A in the vertical direction X provides a space for the water-absorbent polymer to absorb and swell, especially when the absorbent core 11 contains the water-absorbent polymer. Since it can be secured, the water-absorbent polymer tends to exhibit its original absorption performance. From the viewpoint of ensuring that the action and effect of the non-existing region 15X are more reliably performed, the length 15XL (see FIG. 5) of the non-existing region 15X in the longitudinal direction is preferably 3 mm or more, more preferably 5 mm or more. Then, it is preferably 20 mm or less, more preferably 15 mm or less.

As one of the other main features of the slit portion 15A, as shown in FIG. 5, there is a point that the non-existing region 15Y of the fused portion 16 exists at the end portion of the slit portion 15A in the lateral direction Y. The non-existing region 15Y is a region in which the fused portion 16 does not exist over the entire length of the slit portion 15A in the vertical direction X. In the illustrated form, non-existing regions 15Y exist at both ends of the slit portion 15A in the lateral direction Y. The presence of the non-existing region 15Y at the end of the slit portion 15A in the lateral direction provides a space for the water-absorbent polymer to absorb and swell, especially when the absorbent core 11 contains the water-absorbent polymer. Since it can be secured, the water-absorbent polymer tends to exhibit its original absorption performance. From the viewpoint of ensuring that the action and effect of the non-existing region 15Y are more reliably performed, the length 15YL (see FIG. 5) of the non-existing region 15Y in the lateral direction is preferably 1 mm or more, more preferably 1.5 mm. The above, and preferably 2 mm or less, more preferably 1.5 mm or less.

As yet another one of the main features of the slit portion 15A, there is an arrangement pattern of the fused portion 16. The characteristic arrangement pattern of the fused portions 16 is that "a plurality of fused portions 16 are intermittently arranged in the slit portion 15A in the vertical direction X, and all of the plurality of fused portions 16 are arranged in the vertical direction X. The projected image formed at the time of projection is one projected image in which the projected images of the fused portions 16 overlap each other, and all of the plurality of fused portions 16 are projected in the lateral direction Y. If so, the same number of projection images as the plurality of projection images are formed. "

In other words, the characteristic arrangement pattern of the fusing portion 16 in the slit portion 15A is, in other words, referring to FIG. 5, "Fusing in which a plurality of fusing portions 16 are intermittently arranged in the slit portion 15A in the vertical direction X. When the attachment portion existing region 160 exists and one virtual straight line VLx that vertically traverses the fusion portion existence region 160 is drawn at an arbitrary position of the fusion portion existence region 160, the virtual The straight line VLx and the fused portion 16 overlap each other. " The fusion portion existence region 160 (the region surrounded by the middle dotted line in FIG. 5) is the smallest of the rectangular-shaped regions in a plan view including all of the plurality of fusion portions 16 arranged in the slit portion 15A. It is a region other than the non-existing regions 15X and 15Y of the fusion portion 16 described above in the slit portion 15A.

In the slit portion 15A, in this way, the plurality of fused portions 16 are arranged so as to be separated from each other in the vertical direction X and continuous in the horizontal direction Y without a gap, whereby the slit portion 15 is provided. Improving the bonding strength at the fused portion 16 between the core wrap sheets 12 and 13 (nonwoven fabric layers) facing each other, improving the liquid drawing property at the slit portion 15A, and improving the absorption performance of the absorber 10. However, it can be compatible at a high level. Unless otherwise specified, the description of the slit portion 15 is applied to the configuration not particularly described in the slit portion 15A.

In the present embodiment, as shown in FIGS. 1 to 4, the skin-side core wrap sheet 12 and the absorbent core 11 are integrally recessed in the skin-facing surface (the surface facing the surface sheet 3) of the absorber 10. The skin-side concave portion 20 is formed. The skin-side recess 20 does not penetrate the absorber 10 (absorbent core 11), has an opening on the skin-facing surface of the absorber 10, and has a bottom on the side opposite to the opening.

The skin-side concave portion 20 includes a linear skin-side concave portion extending in one direction in a plan view of the absorber 10 as shown in FIG. In the illustrated form, all of the skin-side concave portions 20 formed on the skin-facing surface of the absorber 10 are linear skin-side concave portions. On the skin-facing surface of the absorber 10, a continuous linear skin-side recess 20 extending in the first direction intersecting both the vertical direction X and the horizontal direction Y is intermittent in a direction orthogonal to the first direction. The continuous linear skin-side recesses 20 that are arranged and extend in the vertical direction X, the horizontal direction Y, and the second direction intersecting the first direction are intermittent in the direction orthogonal to the second direction. The recesses 20 on the skin side are arranged in a grid pattern in a plan view of the surface of the absorber 10 facing the skin.

The skin-side recessed portion 20 is formed by applying a pressing process to the absorber 10 from the skin-facing surface side (skin-side core wrap sheet 12 side) of the absorber 10, and the "squeezed portion" is based on the forming method. Can be said. The skin-side recessed portion 20, which is the pressed portion, has a higher density than the periphery of the skin-side recessed portion 20 in the absorber 10. That is, the absorber 10 has a high-density portion corresponding to the skin-side concave portion 20 and a low-density portion in which the skin-side concave portion 20 is not formed, and a density difference occurs in the surface direction of the absorber 10. ..

The pressing process for forming the skin-side concave portion 20 may use a method involving melting of the forming material of the absorber 10, or a method not accompanied by melting of the forming material. Specific examples of the pressing process involving melting of the material for forming the absorber 10 include known embossing processes such as heat-based embossing and ultrasonic embossing. The bottom of the skin-side concave portion 20 formed by the pressing process accompanied by melting of the material for forming the absorber 10, that is, the portion overlapping the skin-side concave portion 20 which is a space portion in a plan view, absorbs with the skin-side core wrap sheet 12. The sex core 11 can be heat-sealed and integrated.

Since the skin-side concave portion 20 is formed on the skin-facing surface of the absorber 10, body fluid such as urine excreted by the wearer of the diaper 1 passes through the skin-side concave portion 20 in the surface direction of the absorber 10. It is drawn into the absorber 10 while being rapidly diffused throughout. Further, since the portion of the absorber 10 on which the skin-side concave portion 20 is formed (the portion overlapping the skin-side concave portion 20 in a plan view) is compacted, the absorber 10 on which the skin-side concave portion 20 is formed is compacted. , The rigidity is increased as compared with the case where this is not formed, and the shape retention is improved. Therefore, the absorber 10 is not easily damaged even if it receives an external force such as being rubbed by the movement of the wearer's legs when the diaper 1 is worn.

With reference to FIG. 3, the intersection angle θ between the linear skin-side concave portion 20 and the lateral virtual straight line VL that passes through the skin-side concave portion 20 and extends in the lateral direction Y is preferably 45 degrees or more. It is preferably 60 degrees or more. The crossing angle θ may be 90 degrees, that is, the linear skin-side recess 20 may extend parallel to the vertical direction X. The crossing angle θ referred to here means the acute angle crossing angle among the acute angle and the obtuse angle generated by the intersection of the linear skin-side concave portion 20 and the lateral virtual straight line VL. When the intersection angle θ is within the above range, it means that the linear skin-side concave portion 20 extends along the vertical direction X. When the crossing angle θ is within the above range, the diffusivity of the liquid in the vertical direction X can be further improved.

The skin-side concave portion 20 may be formed over the entire skin-facing surface of the absorber 10, or may be formed only on a part of the skin-facing surface. The skin-side concave portion 20 is preferably formed at least in the portion facing the excretion portion, and more preferably in the inseam B. In the present embodiment, as shown in FIG. 1, the skin-side concave portion 20 is formed in the entire area of the absorber 10 facing the skin, and therefore the skin-side concave portion 20 is formed in the inseam B. Since the skin-side concave portion 20 is formed in the excretion portion facing portion, which is a portion of the diaper 1 in which body fluid is particularly likely to concentrate, the function of the skin-side concave portion 20 is effectively utilized, and the shape-retaining portion of the absorber 10 is retained. The property and liquid absorption performance can be effectively improved.

In the present embodiment, as shown in FIG. 3, there are slit portion non-forming regions 110 in which the slit portions 15 are not formed over the entire length in the lateral direction Y at both ends of the absorbent core 11 in the vertical direction X. Skin-side concave portions 20 are formed in each of the slit portion non-formed regions 110 at both ends in the vertical direction. In the present embodiment, as shown in FIG. 3, the skin-side concave portion 20 is formed in the entire area of the absorber 10 facing the skin, and therefore the skin-side concave portion 20 is formed in the slit portion non-formed region 110. There is. Since the skin-side concave portion 20 is formed in the slit portion non-forming region 110 at the end of the absorbent core 11 in the vertical direction X, the liquid diffusibility in the surface direction of the absorber 10 is particularly improved, and the liquid is absorbed. Further improvement in performance can be expected.

In the present embodiment, as shown in FIG. 3, the linear skin-side recess 20 extends from one peripheral edge of the absorbent core 11 to the other peripheral edge. That is, each of the plurality of linear skin-side recesses 20 extends the skin-facing surface of the absorbent core 11 over the entire length in the first direction or the second direction. Then, the linear skin-side concave portion 20 intersects the slit portion 15. That is, on the skin-facing surface of the absorber 10, a linear skin-side concave portion 20 is formed that passes from one portion of the peripheral edge of the absorbent core 11 through the slit portion 15 and extends over the other peripheral portion. Has been done. In the illustrated form, a plurality of linear skin-side concave portions 20 that pass through such slit portions 15 are formed. With such a configuration, the liquid existing in the slit portion 15 can be diffused to the entire absorber 10 through the skin-side concave portion 20, the liquid diffusibility in the surface direction of the absorber 10 is improved, and the liquid absorption performance is improved. It leads to the improvement of.

From the viewpoint of ensuring that the above-mentioned action and effect of the skin-side concave portion 20 is more reliably performed, the linear skin-side concave portion 20 not only intersects the slit portion 15 but also exists in the slit portion 15. It is more preferable that the fusing portion 16 intersects with the fusing portion 16. That is, it is more preferable that the virtual extension line of the skin-side recessed portion 20 intersects the fused portion 16.

The width of the linear skin-side recess 20 (that is, the length in the direction orthogonal to the longitudinal direction of the linear skin-side recess 20) 20 W (see FIG. 3) is not particularly limited, but the liquid diffusivity is further increased. From the viewpoint of improvement and from the viewpoint of ensuring the shape retention and flexibility of the absorber 10, it is preferable that the width of the slit portion 15 is narrower than the width of 15 W (see FIG. 3). Specifically, the width 20W of the skin-side concave portion 20 is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably 70, with respect to the width 15W of the slit portion 15. % Or less. The width 20 W of the skin-side concave portion 20 is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less.

From the same viewpoint, the depth 20D (FIG. 4) of the skin-side recess 20 is preferably 20% or more, more preferably 30% or more, and preferably more than 20% with respect to the thickness 11T (FIG. 4) of the absorber. It is 80% or less, more preferably 50% or less. The depth 20D of the skin-side concave portion 20 is preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 8 mm or less, more preferably 5 mm or less.

The absorbable article of the present invention is not limited to the deployable disposable diaper as in the above embodiment, and broadly includes articles used for absorbing body fluids (urine, menstrual blood, loose stool, sweat, etc.) discharged from the human body. It also includes pants-type disposable diapers, sanitary napkins, sanitary shorts, etc. that do not have a fastening structure such as the fastening member 8 and the fastening region 9.

Although the present invention has been described above based on the preferred embodiment thereof, the absorbent article of the present invention is not limited to the embodiment and can be appropriately modified.
For example, from the viewpoint of improving absorbency and leakage resistance, between the surface sheet 3 and the absorber 10 (skin side core wrap sheet 12), from paper or various non-woven fabrics, which are also called second sheets or sublayer sheets. A liquid permeable sheet may be interposed and arranged.
The following additional notes will be further disclosed with respect to the above-described embodiments of the present invention.

<1>
It has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the wearer's lower part rather than the crotch portion. Absorption provided with an absorber that is divided into a ventral portion arranged on the ventral side and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion and extends in the longitudinal direction through the crotch portion. It ’s a sex item,
The absorbers include an absorbent core that absorbs and retains body fluid, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap that covers the non-skin-facing surface of the absorbent core. Consists of including a sheet, both core wrap sheets are made of non-woven fabric
The absorbent core is formed with a slit portion that penetrates the absorbent core in the thickness direction and extends in the vertical direction.
In the region overlapping the slit portion in a plan view, one non-woven fabric layer made of the skin side core wrap sheet is present on the skin facing surface side of the slit portion, and the non-skin facing surface side of the slit portion is the non-skin. There are two non-woven fabric layers consisting of side core wrap sheets,
An absorbent article in which a fused portion in which the three non-woven fabric layers are fused to each other is present in the slit portion.
<2>
The absorbent article according to <1>, wherein the fused portion is located closer to the non-skin facing surface of the absorbent core than the center in the thickness direction of the absorbent core.
<3>
The absorbent article according to <1> or <2>, wherein no adhesive is present in the slit portion.
<4>
The absorbent article according to <3>, wherein the amount of the adhesive applied to the slit portion is preferably 2 g / m ² or less, more preferably 1 g / m ^{2 or less.}
<5>
The basis weight of the material for forming the absorbent core in the slit portion is lower than that of the peripheral portion of the slit portion (for example, a region within 10 mm in the vertical direction or the horizontal direction from the slit portion), specifically. The absorbent article according to any one of <1> to <4>, which is preferably 20% or less, more preferably 10% or less, based on the basis weight of the peripheral portion of the slit portion.
<6>
The vertical length of the slit portion is preferably 20 to 70%, more preferably 30 to 60%, based on the vertical length of the absorber or the absorbent core. The absorbent article according to any one of 1> to <5>.
<7>
The lateral length (width) of the slit portion is preferably 2 to 20%, more preferably 4 to 10%, with respect to the lateral maximum length (maximum width) of the absorbent core. The absorbent article according to any one of <1> to <6>.

<8>
The above <1> to <7>, wherein the absorbent core, the skin-side core wrap sheet, and the non-skin-side core wrap sheet are joined via an adhesive in the non-forming region of the slit portion. The absorbent article according to any one item.
<9>
A plurality of the slit portions are intermittently arranged in the lateral direction.
The absorbent core, the skin-side core wrap sheet, and the non-skin-side core wrap sheet are interposed between the slit portions adjacent to each other in the lateral direction (non-formed region of the slit portion) via an adhesive. The absorbent article according to <8>, which is joined.
<10>
A plurality of the slit portions are intermittently arranged in the lateral direction.
The amount of the adhesive (adhesive applied to the skin-facing surface of the absorbent core) between the absorbent core and the skin-side core wrap sheet is between the slit portions adjacent to each other in the lateral direction. The number of (regions between slit portions) is larger than that of the slit portions located on the outermost side in the lateral direction, as compared with the outer region of the lateral direction (lateral region of the slit portion).
The amount of the adhesive (adhesive applied to the non-skin facing surface of the absorbent core) between the absorbent core and the non-skin side core wrap sheet is determined by the slit portions adjacent to each other in the lateral direction. The space between the slits (the region between the slits) is larger than that of the slit located at the outermost side in the lateral direction, as compared with the outer region in the lateral direction (the lateral outer region of the slit). The absorbent article according to 8> or <9>.
<11>
Between the absorbent core, the skin-side core wrap sheet, and the non-skin-side core wrap sheet, the amount of the adhesive applied in the interslit area and the amount of the adhesive applied in the lateral outer region of the slit, respectively. Assuming that the former> the latter, the ratio of the former / the latter is preferably 1.2 or more, more preferably 1.5 or more, and preferably 3 or less, more preferably 2.5 or less. The absorbent article according to any one of <8> to <10>.
<12>
The amount of the adhesive applied in the interslit region between the absorbent core and the skin-side core wrap sheet and the non-skin-side core wrap sheet is preferably 5 g / m ² or more, more preferably 7 g. The absorbent article according to any one of <8> to <11> above, which is at least / m ² and preferably at least 15 g / m ² and more preferably at least 10 g / m ^2.
<13>
The amount of the adhesive applied to the lateral outer region of the slit portion between the absorbent core and the skin-side core wrap sheet and the non-skin-side core wrap sheet is preferably 3 g / m ² or more, more preferably. The absorbent article according to any one of <8> to <12> above, wherein is 5 g / m ² or more, preferably 10 g / m ² or less, and more preferably 8 g / m ^{2 or less.}

<14>
The absorbent article according to any one of <1> to <13>, wherein a non-existent region of the fused portion exists at the vertical end portion of the slit portion.
<15>
The vertical length of the non-existent region of the fused portion existing at the vertical end of the slit portion is preferably 3 mm or more, more preferably 5 mm or more, and preferably 20 mm or less. The absorbent article according to <14>, which is preferably 15 mm or less.
<16>
The absorbent article according to any one of <1> to <15>, wherein a non-existent region of the fused portion exists at the lateral end portion of the slit portion.
<17>
The lateral length of the non-existent region of the fused portion existing at the lateral end of the slit portion is preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 2 mm or less. , More preferably 1.5 mm or less, the absorbent article according to <16> above.
<18>
A plurality of the fused portions are intermittently arranged in the slit portion in the vertical direction.
The projected image formed when all of the plurality of fused portions are projected in the vertical direction is one projected image in which the projected images of the plurality of fused portions are overlapped with each other, and the plurality of projection images are formed. The absorbent article according to any one of <1> to <17>, wherein the same number of projection images as the plurality of projection images are formed when all of the fused portions of the above are projected in the lateral direction.
<19>
The absorbent article according to any one of <1> to <18>, wherein a plurality of slit portions are intermittently arranged in the lateral direction in the inseam.
<20>
The absorbent article according to <19>, wherein two non-woven fabric layers made of the non-skin side core wrap sheet are present in a region where the slit portions adjacent to each other in the front lateral direction overlap each other in a plan view.

<21>
The item according to any one of <1> to <20>, wherein the skin-side core wrap sheet and the skin-side recessed portion in which the absorbent core is integrally recessed are formed on the skin-facing surface of the absorber. The absorbent article described.
<22>
The skin-side recess includes a linear skin-side recess extending in one direction in a plan view.
The absorption according to <21>, wherein the linear skin-side recess extends from one portion of the peripheral edge of the absorbent core to another portion of the peripheral edge and intersects the slit portion. Sex goods.
<23>
The skin-side recess includes a linear skin-side recess extending in one direction in a plan view.
The acute angle of the intersection of the linear skin-side recess and the lateral virtual straight line that passes through the skin-side recess and extends laterally is preferably 45 degrees or more, more preferably 60 degrees or more. The absorbent article according to <21> or <22>.
<24>
The skin-side recess includes a linear skin-side recess extending in one direction in a plan view.
The absorbent article according to any one of <21> to <23>, wherein the linear recessed portion on the skin side intersects the fused portion existing in the slit portion.
<25>
The skin-side recess includes a linear skin-side recess extending in one direction in a plan view.
The width of the linear skin-side recess (the length in the direction orthogonal to the longitudinal direction of the linear skin-side recess) is the width of the slit (the lateral length of the slit). The absorbent article according to any one of <21> to <24>, which is narrower than the above.
<26>
The width of the linear skin-side concave portion is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably 70% or less with respect to the width of the slit portion. , The absorbent article according to <25> above.
<27>
Any of the above <22> to <26>, wherein the width of the linear skin-side concave portion is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less. Or the absorbent article according to item 1.
<28>
The depth of the skin-side recess is preferably 20% or more, more preferably 30% or more, and preferably 80% or less, more preferably 50% or less, based on the thickness of the absorber. The absorbent article according to any one of <21> to <27>.
<29>
Any one of <21> to <28>, wherein the depth of the skin-side concave portion is preferably 1 mm or more, more preferably 1.5 mm or more, and preferably 8 mm or less, more preferably 5 mm or less. Absorbent articles as described in the section.

1 Disposable diapers (absorbent articles)
2 Absorbent body 3 Front sheet 4 Back sheet 5 Flap part 6 Leakage-proof cuff 10 Absorber 11 Absorbent core 12 Skin side core wrap sheet 13 Non-skin side core wrap sheet 130 Two-layer part 15, 15A Slit part 16 Fusion part 20 Skin side recess A Ventral side B Inseam C Dorsal side X Vertical direction Y Horizontal direction

Claims (11)

It has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction orthogonal to the vertical direction, and the crotch portion arranged in the crotch portion and the wearer's lower part rather than the crotch portion. Absorption provided with an absorber that is divided into a ventral portion arranged on the ventral side and a dorsal portion arranged on the dorsal side of the wearer rather than the crotch portion and extends in the longitudinal direction through the crotch portion. It ’s a sex item,
The absorbers include an absorbent core that absorbs and retains body fluid, a skin-side core wrap sheet that covers the skin-facing surface of the absorbent core, and a non-skin-side core wrap that covers the non-skin-facing surface of the absorbent core. Consists of including a sheet, both core wrap sheets are made of non-woven fabric
The absorbent core is formed with a slit portion that penetrates the absorbent core in the thickness direction and extends in the vertical direction.
In the region overlapping the slit portion in a plan view, one non-woven fabric layer made of the skin side core wrap sheet is present on the skin facing surface side of the slit portion, and the non-skin facing surface side of the slit portion is the non-skin. There are two non-woven fabric layers consisting of side core wrap sheets,
An absorbent article in which a fused portion in which the three non-woven fabric layers are fused to each other is present in the slit portion. The absorbent article according to claim 1, wherein the fused portion is located closer to the non-skin facing surface of the absorbent core than the center in the thickness direction of the absorbent core. The absorbent article according to claim 1 or 2, wherein no adhesive is present in the slit portion. Any one of claims 1 to 3, wherein the absorbent core, the skin-side core wrap sheet, and the non-skin-side core wrap sheet are joined via an adhesive in the non-forming region of the slit portion. Absorbent articles described in the section. The absorbent article according to any one of claims 1 to 4, wherein a non-existent region of the fused portion exists at the vertical end portion of the slit portion. The absorbent article according to any one of claims 1 to 5, wherein a non-existent region of the fused portion exists at the lateral end portion of the slit portion. A plurality of the fused portions are intermittently arranged in the slit portion in the vertical direction.
The projected image formed when all of the plurality of fused portions are projected in the vertical direction is one projected image in which the projected images of the plurality of fused portions are overlapped with each other, and the plurality of projection images are formed. The absorbent article according to any one of claims 1 to 6, wherein when all of the fused portions of the above are projected in the lateral direction, the same number of projection images as the plurality of projection images are formed. The absorbent article according to any one of claims 1 to 7, wherein a plurality of slit portions are intermittently arranged in the lateral direction in the inseam. The absorbent article according to claim 8, wherein two non-woven fabric layers made of the non-skin side core wrap sheet are present in a region where the slit portions adjacent to each other in the front lateral direction overlap each other in a plan view. The absorption according to any one of claims 1 to 9, wherein a skin-side core wrap sheet and a skin-side recessed portion in which the absorbent core is integrally recessed are formed on the skin-facing surface of the absorber. Sex goods. The skin-side recess includes a linear skin-side recess extending in one direction in a plan view.
The absorbency according to claim 10, wherein the linear skin-side recess extends from one portion of the peripheral edge of the absorbent core to another portion of the peripheral edge and intersects the slit portion. Goods.

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