JP2018015078A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of improving a liquid absorption performance of an absorbent article.SOLUTION: An absorbent article comprises: a first sheet which has hydrophilic property, and permeates a liquid in a thickness direction; a second sheet which has impermeability; and an absorber sandwiched by the first and second sheets, absorbs and holds the liquid which permeated the first sheet. A groove part is provided on a surface on the first sheet side of the absorber. Between the second sheet and the absorber, a diffusion layer which has hydrophilic property, and diffuses the liquid which permeated the second sheet side through the absorber is provided on a position overlapping with the groove part in viewing from the absorber in a direction going to the diffusion layer. A substrate forming the diffusion layer is arranged so as not to cover a surface on the first sheet side of the absorber.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article that absorbs and holds a liquid.

  Absorbent articles that absorb and retain liquid components excreted from the wearer, such as paper diapers, urine pads, and napkins, are known. Such an absorbent article generally includes a top sheet, an absorber, and a back sheet (for example, Patent Documents 1 and 2 below). The top sheet directly contacts the wearer's skin when the wearer wears the absorbent article. The top sheet has liquid permeability that allows liquid to permeate, and allows liquid components excreted from the wearer's body to penetrate in the thickness direction. The absorber is laminated on the top sheet and absorbs and holds the liquid component that has passed through the top sheet. The back sheet is disposed on the opposite side of the top sheet with the absorbent body interposed therebetween. The back sheet has a liquid impermeability that prevents liquid from penetrating, and prevents leakage of liquid components to the outside.

JP 2003-33390 A Japanese Patent Laying-Open No. 2015-66375

  In the absorbent article, in order to increase the amount of liquid that can be absorbed and held, it is desirable that the liquid holding area in the absorbent body is widened. In the techniques of Patent Documents 1 and 2 above, a diffusion layer for diffusing the liquid is provided on the back sheet side surface of the absorber so that the liquid absorbed by the absorber can reach the absorber. . However, there are cases where the liquid does not reach the diffusion layer and the function of the diffusion layer is not sufficiently exhibited by merely providing the diffusion layer on the back sheet side of the absorber as in the techniques of Patent Documents 1 and 2. Thus, in the absorbent article, there is still room for improvement with respect to a technique for increasing the amount of liquid that can be absorbed and retained by spreading the liquid to the absorbent body.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

[1] According to one aspect of the present invention, an absorbent article that absorbs and holds a liquid is provided. The absorbent article includes a first sheet, a second sheet, and an absorber. The first sheet has hydrophilicity and transmits the liquid in the thickness direction. The second sheet has liquid impermeability. The absorber is sandwiched between the first sheet and the second sheet, and absorbs and holds the liquid that has passed through the first sheet. A groove is provided on the surface of the absorber on the first sheet side. Between the second sheet and the absorber, there is provided a diffusion layer that has hydrophilicity and diffuses the liquid that has passed through the absorber to the second sheet side. The diffusion layer is in a position overlapping the groove when viewed in the direction from the absorber toward the diffusion layer. The base material constituting the diffusion layer is arranged so as not to cover the surface of the absorber on the first sheet side. According to the absorbent article of this form, the liquid can be guided along the groove portion, and the region where the liquid is absorbed can be expanded on the first sheet side of the absorber. Further, the liquid absorbed by the absorber and gathered at the site below the groove can be diffused by being guided toward the diffusion layer, and can be led to a site other than the site below the groove. Therefore, the area | region where a liquid is absorbed can be expanded also in the 2nd sheet | seat side of an absorber. In addition, the base material which comprises a diffusion layer is arrange | positioned so that the surface at the side of the 1st sheet | seat of an absorber may not be coat | covered. Therefore, it is suppressed that the liquid that has reached the diffusion layer reaches the entire surface on the first sheet side of the absorber through the base material constituting the diffusion layer. Moreover, it is suppressed that the said base material is used vainly in the site | part which cannot perform the function as a diffusion layer.

[2] In the absorbent article of the above aspect, the absorber includes an absorbent resin that is a resin material having a property of absorbing and holding the liquid, and the absorbent is included in a unit volume in the absorber. The weight of the resin is larger on the second sheet side than on the first sheet side. According to the absorbent article of this form, the liquid absorbed by the absorber can be guided toward the diffusion layer on the second sheet side. Moreover, it can suppress that the liquid absorbed by the absorber returns to the 1st sheet | seat side.

[3] In the absorbent article according to the above aspect, a back-side concave portion that is a concave portion formed by compressing the absorber is formed on the surface of the absorber on the second sheet side from the absorber to the diffusion layer. It may be provided in a region overlapping with the diffusion layer when viewed in the direction toward the surface. According to the absorbent article of this embodiment, the first sheet side of the concave portion on the back surface is formed with a portion where density is increased and capillary force is increased by compression. Absorption of liquid into is promoted. In addition, the back-side concave portion can diffuse the liquid using the gap formed between the absorber and the diffusion layer as a flow path, and can widen the region where the liquid is absorbed.

[4] In the absorbent article of the above aspect, the diffusion layer may have a diffusion layer recess recessed in the thickness direction. According to the absorbent article of this form, the liquid can be diffused using the gap formed by the diffusion layer recess as a flow path. Further, the liquid can be held in the gap, and the return of the liquid to the first sheet side can be suppressed.

[5] In the absorbent article according to the above aspect, the diffusion layer may be formed of a member that is less likely to decrease the hydrophilicity when the liquid is repeatedly absorbed than the member that forms the first sheet. According to the absorbent article of this embodiment, when the liquid absorption is locally repeated in the first sheet, the hydrophilicity of the portion where the liquid absorption is repeated in the first sheet is the hydrophilicity of the diffusion layer. It drops before it drops. Then, at the time of subsequent liquid absorption, on the first sheet, the liquid can be guided to a portion having high hydrophilicity other than the portion where the hydrophilicity is reduced, and absorbed by the absorber. . And the liquid can be diffused in a wide range by the diffusion layer in which hydrophilicity is maintained. Therefore, in a situation where liquid absorption is repeated, the area where the liquid is absorbed can be expanded.

  A plurality of constituent elements of each aspect of the present invention described above are not indispensable, and some or all of the effects described in the present specification are to be solved to solve part or all of the above-described problems. In order to achieve the above, it is possible to appropriately change, delete, replace with another new component, and partially delete the limited contents of some of the plurality of components. In order to solve part or all of the above-described problems or to achieve part or all of the effects described in this specification, technical features included in one embodiment of the present invention described above. A part or all of the technical features included in the other aspects of the present invention described above may be combined to form an independent form of the present invention.

  The present invention can be realized as various forms of absorbent articles. For example, it can be realized in the form of a diaper including a tape type and a pants type, a urine collection pad, a napkin, and other sanitary products. Moreover, this invention can also be implement | achieved with forms other than the absorbent article for processing a wearer's excrement.

The schematic plan view which shows the absorbent article of 1st Embodiment. The schematic sectional drawing of the absorptive article of a 1st embodiment. Explanatory drawing which shows typically the behavior of the liquid between an absorber and a diffusion layer. The schematic sectional drawing of the absorptive article of a 2nd embodiment. The schematic sectional drawing of the absorptive article of a 3rd embodiment. The schematic plan view which shows the absorbent article of 4th Embodiment. The schematic sectional drawing of the absorbent article of 4th Embodiment. The schematic plan view which shows the other structural example of the back surface side recessed part of 4th Embodiment. The schematic sectional drawing which shows the other structural example of the back surface side recessed part of 4th Embodiment. The schematic plan view which shows another example of another structure of the back surface side recessed part of 4th Embodiment. The schematic sectional drawing which shows another example of another structure of the back surface side recessed part of 4th Embodiment.

A. First embodiment:
With reference to FIG. 1 and FIG. 2, 10 A of absorbent articles as 1st Embodiment of this invention are demonstrated. FIG. 1 is a schematic plan view showing an absorbent article 10A according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the absorbent article 10A taken along the line 2-2 shown in FIG. 1 and 2 show arrows X, Y, and Z that indicate three directions orthogonal to each other with the absorbent article 10A as a reference. The correspondence between the absorbent article 10A and the directions indicated by the arrows X, Y, and Z will be described later. The arrows X, Y, and Z are appropriately illustrated so as to correspond in other drawings. FIG. 1 illustrates a surface side facing the wearer when the absorbent article 10A in the unfolded state is used. In the schematic cross-sectional view of FIG. 2, for convenience, the members constituting the absorbent article 10 </ b> A are illustrated in a separated state. All schematic cross-sectional views referred to in this specification are illustrated in the same manner.

  Absorbent article 10A of the present embodiment is a so-called tape-type paper diaper and has a strip shape (FIG. 1). When the absorbent article 10A is attached to the wearer, the absorbent article 10A is applied from the wearer's belly side to the back side so as to cover the wearer's crotch and is fastened with a tape. For convenience of explanation, the absorbent article 10 </ b> A is divided into a front part 11, a middle part 12, and a rear part 13 in order in the longitudinal direction according to the arrangement position when worn by the wearer. The front part 11, the middle part 12, and the rear part 13 have shown the name for every site | part of 10 A of absorbent articles, and do not show the name of the member which comprises 10 A of absorbent articles. The front part 11 illustrated on the lower side of the drawing is a part arranged on the abdomen side of the wearer. The middle part 12 illustrated around the center of the paper is a part disposed around the crotch of the wearer. The rear portion 13 illustrated on the upper side of the drawing is a portion disposed on the wearer's back side.

  Here, directions indicated by arrows X, Y, and Z will be described. An arrow X indicates a direction along the longitudinal direction of the absorbent article 10 </ b> A in a developed state, and indicates a direction from the rear portion 13 toward the front portion 11. Hereinafter, a direction parallel to the direction of the arrow X is also referred to as a “length direction”. The arrow Y indicates the direction along the short direction of the absorbent article 10A in the deployed state, and indicates the direction from the right side to the left side of the wearer when the absorbent article 10A is worn by the wearer. ing. Hereinafter, a direction parallel to the direction of the arrow Y is also referred to as a “width direction”. An arrow Z indicates a direction along the thickness direction of the absorbent article 10A, and indicates a direction from the absorbent article 10A toward the wearer when the absorbent article 10A is worn by the wearer. In the following description, when referring to the absorbent article 10 </ b> A, “upper” means the direction side indicated by the arrow Z, and “lower” means the opposite direction side.

  Absorbent article 10A is provided with top sheet 20, back sheet 30, and absorber 40 (Drawing 2). The top sheet 20 is a sheet-like member that directly contacts the wearer's skin when worn by the wearer. The top sheet 20 is disposed on the absorber 40 so as to cover the entire absorber 40. The top sheet 20 has hydrophilicity at least on the surface in contact with the wearer's skin. Further, the top sheet 20 has liquid permeability that allows liquid to pass through at least in the thickness direction. When the absorbent article 10 </ b> A is used, a liquid that is a liquid component of excreta excreted on the top sheet 20 passes through the top sheet 20. The top sheet 20 corresponds to a subordinate concept of the first sheet in the present invention.

  The top sheet 20 is configured by, for example, a woven fabric, a nonwoven fabric, a porous film, a net-like sheet having a mesh, or the like. In consideration of liquid permeability and good touch, it is preferable that the top sheet 20 is composed of a nonwoven fabric. As the nonwoven fabric, for example, a spunbond nonwoven fabric, a needle punched nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, or the like can be used.

  The backsheet 30 is a sheet-like member that is stacked so as to overlap the topsheet 20 with the absorber 40 interposed therebetween. The back sheet 30 has liquid impermeability and functions as a waterproof sheet that suppresses leakage of liquid absorbed by the absorber 40 to the outside. The back sheet 30 is disposed on the side opposite to the top sheet 20 so as to cover the entire lower surface of the absorber 40. The back sheet 30 corresponds to a subordinate concept of the second sheet in the present invention.

  The back sheet 30 can be composed of, for example, a synthetic resin film such as polyethylene, a liquid-impermeable film, or the like. The liquid-impermeable film may be composed of a composite sheet of a nonwoven fabric and a synthetic resin film, such as a sheet in which a breathable synthetic resin film is sandwiched between nonwoven fabrics such as spunbond. The back sheet 30 desirably has so-called moisture permeability that does not allow liquid water to permeate but allows water vapor to permeate. The backsheet 30 may be constituted by a liquid-impermeable film having moisture permeability such as a microporous polyethylene film having fine pores of 0.1 to 0.5 μm, for example.

  The absorber 40 is sandwiched between the top sheet 20 and the back sheet 30 as described above. The absorber 40 absorbs and holds the liquid that has passed through the top sheet 20. In the present embodiment, the absorbent body 40 has a flat sheet shape, and is disposed at a position that can cover at least the wearer's crotch portion when the absorbent article 10A is worn by the wearer. In FIG. 1, the outer periphery outline of the absorber 40 is shown with the dashed-dotted line. The top sheet 20 and the back sheet 30 are joined to each other on the outer periphery of the absorber 40. A joint portion (not shown) between the top sheet 20 and the back sheet 30 surrounds the outer periphery of the absorbent body 40 so that the absorbent body 40 is sealed inside the absorbent article 10A.

  The absorber 40 includes an absorbent fiber that is a fiber material that can absorb a liquid, and an absorbent resin that is a resin material having a property of absorbing and holding the liquid. The absorbent resin is held in the gaps between the absorbent fibers. When the absorber 40 absorbs the liquid, the liquid enters the fine gap between the fibers of the absorbent fiber, and the liquid is also absorbed and held by the absorbent resin present in the gap. In addition, the absorber 40 is not limited to the structure by which absorbent resin is arrange | positioned between the fibers of an absorbent fiber. The absorber 40 may be configured by combining a fiber member made of an absorbent fiber and a resin member made of an absorbent resin. For example, the absorber 40 may be configured as a laminate of a resin sheet obtained by forming an absorbent resin into a sheet shape and a fiber sheet obtained by forming absorbent fibers into a sheet shape.

  In this embodiment, an absorptive fiber is comprised by fluff pulp (cotton pulp). Absorbent fibers are hydrophilic to pulp fibers other than fluff pulp, short fibers of cellulose fibers such as rayon fibers or cotton fibers (fiber lengths of 5 mm or less), synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It may be composed of short fibers (fiber length of 5 mm or less) that have been subjected to a chemical treatment. These fibers can be used alone or in combination of a plurality of types of fibers.

  An absorptive resin is comprised by the hydrophilic polymer with a crosslinked structure which can absorb and hold | maintain water, for example. The absorptive resin is preferably composed of a superabsorbent polymer (SAP: Super Absorbent Polymer). The absorbent resin may be composed of a starch-based, cellulose-based, or synthetic polymer-based resin. More specifically, the absorbent resin is a starch-acrylic acid (salt) graft copolymer, a saponified starch-ethyl acrylate graft copolymer, a saponified starch-methyl methacrylate graft copolymer, starch, -Saponified product of acrylonitrile graft copolymer, saponified product of starch-acrylamide graft copolymer, polyacrylic acid (salt), polyethylene oxide cross-linked with acrylic acid, cross-linked product of sodium carboxymethyl cellulose, polyvinyl alcohol-maleic anhydride You may be comprised by the crosslinked material etc. of the reaction material.

  In the present embodiment, the absorbent body 40 is entirely wrapped by the core wrap sheet 41. The core wrap sheet 41 has a function of maintaining the shape of the absorber 40. In FIG. 2, for convenience, the absorber 40 and the core wrap sheet 41 are illustrated separately from each other, but the core wrap sheet 41 is in close contact with and integrated with the surface of the absorber 40. The core wrap sheet 41 is configured by a sheet-like member having hydrophilicity and liquid permeability. The core wrap sheet 41 may be constituted by a single sheet-like member, or may be constituted by combining a plurality of sheet-like members.

The core wrap sheet 41 is made of a paper member such as tissue paper, for example. A tissue paper having a basis weight of 10 to 30 g / m ² may be employed. The core wrap sheet 41 may be made of a nonwoven fabric. As the nonwoven fabric, a spunbond nonwoven fabric, a needle punched nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, or the like may be employed. As a nonwoven fabric, the thing of the multilayer structure which laminated | stacked multiple types of nonwoven fabric may be employ | adopted like the SMS nonwoven fabric which pinched | mixed the meltblown with the spunlace nonwoven fabric, for example.

  A groove portion 42 is provided on the surface on the top sheet 20 side that is the upper surface of the absorber 40. The groove part 42 is formed by pressing and compressing the absorber 40 in the thickness direction. Therefore, in the absorber 40, the groove lower part 43 which is a part below the groove part 42 is squeezed, and the density thereof is higher than that of other parts. The groove part 42 is formed by embossing, for example.

  In this embodiment, when the absorber 40 is wrapped in the core wrap sheet 41 and the top sheet 20 is disposed thereon, the groove 42 is formed by pressing the absorber 40 together with the top sheet 20. Is done. Thereby, as shown in FIG. 2, a part of the top sheet 20 and the core wrap sheet 41 enters the groove portion 42, and the top sheet 20 and the absorber 40 are integrated. As shown in FIGS. 1 and 2, the surface groove portion 22 that overlaps the groove portion 42 of the absorber 40 is formed on the surface of the top sheet 20. Hereinafter, when both the surface groove portion 22 of the top sheet 20 and the groove portion 42 of the absorber 40 are indicated, they are also expressed as “groove portions 22, 42”.

  In the present embodiment, the groove portions 22 and 42 extend in an oblique direction intersecting the length direction and the width direction and intersect in a lattice shape (FIG. 1). The groove portions 22 and 42 are preferably formed from the front portion 11 to the rear portion 13 at least in the central region in the width direction. The groove portions 22 and 42 may be formed over the entire surface facing the wearer's skin, or may be formed over the entire surface of the absorbent body 40. The grooves 22 and 42 function as flow paths that guide the liquid to diffuse along the upper surface of the absorber 40. Moreover, the groove parts 22 and 42 also have a function of making the absorbent body 40 easy to bend and improving the fit when the wearer wears the absorbent article 10A. The surface groove portion 22 also functions to enhance air permeability in the space between the wearer and the top sheet 20.

  In the absorbent article 10 </ b> A, the diffusion layer 50 is provided between the back sheet 30 and the absorber 40. More specifically, the diffusion layer 50 is disposed between the back sheet 30 and the core wrap sheet 41 disposed under the absorber 40. The diffusion layer 50 is disposed at a position overlapping the groove portion 42 of the absorber 40 when viewed in the direction opposite to the arrow Z that is the direction from the absorber 40 toward the diffusion layer 50. The diffusion layer 50 is preferably provided so as to cover the entire region where the groove 42 of the absorber 40 is formed. In FIG. 1, the outer peripheral outline representing the arrangement region of the diffusion layer 50 is illustrated by a two-dot chain line. In the absorbent article 10A of the present embodiment, the liquid absorption performance is enhanced by the combination of the groove portion 42 of the absorber 40 and the diffusion layer 50, details of which will be described later.

The diffusion layer 50 is composed of a sheet-like member having a hydrophilic property and capable of diffusing a liquid inside the liquid. The diffusion layer 50 desirably has high liquid diffusibility in a direction along the surface. The diffusion layer 50 is made of, for example, a paper member such as tissue paper, a nonwoven fabric, or the like. In particular, it is desirable to be constituted by a bulky air-through nonwoven fabric or a chemical bond nonwoven fabric having a basis weight of about 15 to 40 g / m ² . It is desirable that the diffusion layer 50 is made of at least a member that is less likely to deteriorate the hydrophilicity or the liquid diffusibility even when the liquid absorption / diffusion is repeated a plurality of times than the member constituting the top sheet 20. The reason for this will be described later. In addition, if the above-described bulky air-through nonwoven fabric or a chemical bond nonwoven fabric having a basis weight of about 15 to 40 g / m ² , such hydrophilicity and liquid diffusibility durability can be easily obtained in the diffusion layer 50.

  In the present embodiment, the entire base material constituting the diffusion layer 50 is contained in a region sandwiched between the absorber 40 and the back sheet 30. Thereby, since the diffusion layer 50 can be formed only by arranging a sheet-like member between the absorbent body 40 and the back sheet 30, the manufacture of the absorbent article 10A is facilitated. In addition, the base material which comprises the diffusion layer 50 does not need to be settled in the area | region pinched | interposed into the absorber 40 and the back seat | sheet 30. FIG. The outer peripheral end of the base material constituting the diffusion layer 50 may extend outward from the outer peripheral end of the absorber 40 or may be folded back toward the top sheet 20 side surface of the absorber 40. Good. The base material which comprises the diffusion layer 50 should just be arrange | positioned so that the whole surface at the side of the top sheet 20 of the absorber 40 may not be coat | covered completely. Thereby, it is suppressed that the liquid that has reached the diffusion layer 50 returns backward through the base material constituting the diffusion layer 50 and spreads over the entire surface of the absorber 40 on the top sheet 20 side. Moreover, it is suppressed that the base material which comprises the diffusion layer 50 will be arrange | positioned wastefully in the site | part which does not show the function as the diffusion layer 50. In addition, the base material which comprises the diffusion layer 50 can be distinguished from the base material which comprises the core wrap sheet | seat 41 in the point arrange | positioned so that the surface at the side of the top sheet 20 of the absorber 40 may not be coat | covered.

  In the present embodiment, the diffusion layer 50 is partially bonded to the core wrap sheet 41 of the absorber 40. Thereby, the diffusion layer 50 is formed with a portion that is allowed to move away from the absorber 40 and can be separated from the absorber 40. For this reason, when the diffusion layer 50 absorbs the liquid, the diffusion layer 50 is separated from the absorber 40 at that portion, and a minute gap into which the liquid can enter is formed, so that the liquid between the absorber 40 and the diffusion layer 50 can be removed. Distribution and retention are improved. Note that the portion of the diffusion layer 50 that can be separated from the absorber 40 may be in contact with the core wrap sheet 41. A portion of the diffusion layer 50 that can be separated from the absorber 40 may be not bonded to the core wrap sheet 41.

  As described above, if the diffusion layer 50 is partially adhered to the core wrap sheet 41, the displacement of the diffusion layer 50 can be suppressed. As a bonding method of the diffusion layer 50, for example, bonding with a hot melt adhesive, heat welding (heat sealing), ultrasonic heat welding (sonic sealing), or the like may be employed. Further, when forming the groove portion 42 of the absorber 40, the diffusion layer 50 is disposed under the absorber 40 wrapped in the core wrap sheet 41, and the diffusion layer is formed by the pressing force when forming the groove portion 42. 50 may be crimped to the absorbent body 40 via the core wrap sheet 41. Note that the diffusion layer 50 may be partially or entirely bonded to the back sheet 30 in order to suppress the displacement. The diffusion layer 50 may be adhered only to the back sheet 30 without being adhered to the core wrap sheet 41. The bonding method of the diffusion layer 50 to the back sheet 30 may be the same bonding method as any of the bonding methods described above, or may be a different bonding method.

  The absorbent article 10 </ b> A further includes a cover sheet 60 and a side sheet 70. The cover sheet 60 is a sheet-like member disposed under the back sheet 30 (FIG. 2). When the absorbent article 10A is worn by the wearer, the cover sheet 60 is located on the outermost side and constitutes the exterior of the absorbent article 10A. The cover sheet 60 has a function of increasing the strength of the absorbent article 10A. As for the cover sheet 60, it is desirable for the surface on the opposite side to the absorber 40 to be surface-treated so that a touch may become favorable.

  The cover sheet 60 is made of, for example, a woven fabric or a non-woven fabric. As the nonwoven fabric, a dry nonwoven fabric, a wet nonwoven fabric or the like made of a thermoplastic resin such as polyethylene, polypropylene, or polyester can be employed. The cover sheet 60 may be integrated with the back sheet 30, or a waterproof layer that functions as the back sheet 30 may be formed on the surface of the cover sheet 60 on the absorber 40 side. In this case, the cover sheet 60 may be interpreted as one of the subordinate concepts of the second sheet in the present invention.

  In the cover sheet 60, constricted portions 61 (FIG. 1) having a width smaller than those of the front portion 11 side and the rear portion 13 side are provided on both sides in the width direction at a portion including the middle portion 12. The constricted part 61 is a part in contact with the base of the wearer's thigh. In the present embodiment, the region where the absorber 40 is disposed and the region where the grooves 22 and 42 are formed extend outward from the region where the constricted portion 61 is formed in the length direction of the absorbent article 10A.

  In the absorbent article 10 </ b> A, a plurality of elastic members 62 are stretched in the direction of the arrow X along the constricted portions 61 on both sides. Since the elastic member 62 is embedded in the inside, it is illustrated by a broken line in FIG. As shown in FIG. 2, the elastic member 62 is disposed between the cover sheet 60 and the side sheet 70. The elastic member 62 is made of thread rubber, a stretchable nonwoven fabric, a stretchable resin film, or the like. In the state of FIG. 1, the elastic member 62 is in an extended state. When the elastic member 62 is elastically contracted, a gathered portion (so-called leg gather) that fits the base of the wearer's thigh is formed. This leg gather prevents the excrement from leaking from the constricted portion 61.

  The fixing tape 63 is attached to the rear portion 13 of the cover sheet 60 at both end portions in the width direction so as to protrude in the direction of the arrow X (FIG. 1). Further, a fixing portion 64 called a front patch is provided on the outer surface of the front portion 11 of the cover sheet 60. The adhesive surface of the fixing tape 63 and the surface of the fixing portion 64 are constituted by a hook-and-loop fastener. When the absorbent article 10 </ b> A is worn by the wearer, the pair of fixing tapes 63 are routed from the wearer's back side to the abdomen side and attached to the fixing portion 64. Thereby, 10 A of absorbent articles are fixed to a wearer.

  An elastic member 65 is embedded between the pair of fixing tapes 63. The elastic member 65 is constituted by, for example, a plurality of thread rubbers arranged in parallel. The elastic member 65 is stretched in the direction of the arrow Y so as to be elastically deformable in the width direction between the top sheet 20 and the cover sheet 60. In FIG. 1, the embedded elastic member 65 is indicated by a broken line. In the state of FIG. 1, the elastic member 65 is in an extended state. When the elastic member 65 is elastically contracted in the width direction, a so-called gather portion (so-called waist gather) that fits around the waist of the wearer is formed. By this waist gather, it is suppressed that excrement leaks from a wearer's back side.

  In the absorbent article 10A, a pair of side sheets 70 are provided at both ends in the width direction (FIGS. 1 and 2). Each side sheet 70 is disposed over the entire length direction above the top sheet 20. The pair of side sheets 70 are arranged at intervals in the width direction, and the surface of the top sheet 20 is exposed to the outside between the pair of side sheets 70. Each side sheet 70 is configured by a sheet-like member having liquid impermeability. Each side sheet 70 may be made of the same material as the cover sheet 60.

  Each side sheet 70 is joined to the cover sheet 60 at the outer end 71 in the width direction (FIG. 2). The end portion 72 of each side sheet 70 is located on the center side in the width direction and is disposed on the top sheet 20. The end 72 can move in a direction away from the top sheet 20. The end portion 72 is folded back twice, and a plurality of elastic members 73 are arranged inside the double structure. In FIG. 1, the elastic member 73 is illustrated by a broken line.

  The elastic member 73 is stretched in the direction of the arrow X on the absorbent body 40 so as to be elastically deformable in the length direction of the absorbent article 10A. In FIG. 1, the elastic member 73 is in an extended state. When the absorbent article 10A is worn by the wearer, the elastic member 62 is elastically contracted, whereby the end 72 side of the side sheet 70 rises from the surface of the top sheet 20 and forms a so-called three-dimensional gather. By the three-dimensional gather, it is suppressed that excrement leaks to the area | region of the outer side of the absorber 40. FIG.

  With reference to FIG. 1 and FIG. 2, absorption of the liquid through the groove parts 22 and 42 is demonstrated. In the absorbent article 10A of the present embodiment, as described above, the groove portion 42 is formed on the surface of the absorbent body 40 on the top sheet 20 side. Further, a surface groove portion 22 formed by the top sheet 20 entering the groove portion 42 is formed thereon. Thus, the liquid excreted from the wearer is spread along the groove portions 22 and 42 on the surface of the absorber 40 on the top sheet 20 side, and is transmitted through the top sheet 20 and absorbed by the absorber 40 (FIG. 1). ). Thus, in the absorbent article 10 </ b> A of the present embodiment, the diffusion range of the liquid component on the top sheet 20 side is widened by the grooves 22 and 42.

  Moreover, in 10 A of absorbent articles of this embodiment, the groove part 42 of the absorber 40 is compressed and formed in the thickness direction of the absorber 40 (FIG. 2). Therefore, the density of the fibers is locally increased in the lower groove portion 43 below the groove portion 42, and the gap between the fibers is reduced. Thereby, the capillary force in the groove | channel lower part 43 is raised and the absorption speed of the liquid via the groove part 42 is raised. Therefore, the liquid component of excreta present on the surface of the top sheet 20 is reduced in a short time, and the wearer feels uncomfortable and the occurrence of rough skin of the wearer such as the occurrence of rash is suppressed.

  With reference to FIG. 3, the behavior of the liquid between the absorber 40 and the diffusion layer 50 will be described. FIG. 3 shows a region near the groove 42 shown in FIG. FIG. 3 shows a broken-line arrow schematically showing the movement path of the liquid.

  In the absorbent body 40 in the absorbent article 10A of the present embodiment, the liquid is likely to collect in the groove-lowering portion 43 having a high capillary force. The liquid collected in the lower groove portion 43 is guided to the hydrophilic diffusion layer 50 disposed thereunder, and along the thickness direction of the diffusion layer 50 and the lower surface of the absorber 40 inside the diffusion layer 50. It is diffused in the direction. A part of the liquid diffused in the diffusion layer 50 is guided to a portion having a small amount of liquid other than the groove portion 43 in the absorber 40. Thus, according to the absorbent article 10 </ b> A of the present embodiment, the liquid collected in the lower groove part 43 of the absorber 40 can be guided to another part through the diffusion layer 50. Therefore, the diffusion range of the liquid component is widened on the back sheet 30 side. Moreover, it is suppressed that the liquid collected in the groove | channel lower part 43 oozes out to the top sheet 20 side, and returns.

  In order to make it easier for the liquid in the absorber 40 to move to the diffusion layer 50, the diffusion layer 50 is preferably made of a member having a higher hydrophilicity than the core wrap sheet 41. In addition, as described above, the diffusion layer 50 is constituted by a member that is less likely to deteriorate the hydrophilicity or the liquid diffusibility even when the liquid absorption / diffusion is repeated a plurality of times than the member constituting the top sheet 20. It is desirable that With such a configuration, when the absorption of the liquid is locally repeated in the top sheet 20, the hydrophilicity of the portion of the top sheet 20 where the absorption of the liquid is repeated is the hydrophilicity of the diffusion layer 50. It drops before it drops. Therefore, at the time of subsequent liquid absorption, the liquid can be guided and absorbed on the surface of the top sheet 20 to a portion having high hydrophilicity other than the portion where the hydrophilicity is lowered. The liquid can be diffused and held in a wide range by the diffusion layer 50 in which the hydrophilicity is still maintained. Therefore, when excretion by the wearer is repeated, the area where the liquid is absorbed and retained can be further expanded. The hydrophilicity of the top sheet 20 and the diffusion layer 50 is determined when the liquid is dropped several times on the same part and the time until the liquid penetrates into the inside and disappears from the surface starts to increase. , It can be determined that it has dropped.

The grooves 22 and 42 are preferably formed by the following process.
Step 1: An absorbent body 40 in which the groove 42 is not formed is prepared and wrapped with a core wrap sheet 41.
Step 2: The top sheet 20, the absorber 40, the diffusion layer 50, and the back sheet 30 are laminated in this order. At this time, the cover sheet 60 may be disposed under the back sheet 30, or the side sheet 70 may be disposed on the top sheet 20.
Step 3: The grooves 22 and 42 are formed by pressing the absorber 40 from above the top sheet 20.
According to this process, when the groove portions 22 and 42 are formed by pressing, the diffusion layer 50 functions as a cushion, so that deterioration of the top sheet 20 and the back sheet 30 is suppressed. Further, since the surface groove portion 22 and the groove portion 42 are formed at the same time, it is possible to inspect the press pattern formed on the absorber 40 by visual recognition in the manufacturing process.

  As described above, according to the absorbent article 10A of the present embodiment, at least both the groove portion 42 and the diffusion layer 50 of the absorber 40 have improved liquid absorption performance and retention performance. In addition, according to the absorbent article 10A of the present embodiment, various functions and effects described in the present embodiment can be achieved.

B. Second embodiment:
FIG. 4 is a schematic cross-sectional view of an absorbent article 10B as a second embodiment of the present invention. The absorbent article 10B of the second embodiment has substantially the same configuration as the absorbent article 10A of the first embodiment except that the configuration of the absorbent body 40B is different. In FIG. 4, the distribution state of the absorbent resin contained in the absorber 40B is schematically represented by dots.

  In the absorbent body 40B of the second embodiment, the weight of the absorbent resin contained per unit volume is changed in the thickness direction, and the weight of the absorbent fiber contained per unit volume is changed accordingly. ing. In the absorbent body 40B, the weight of the absorbent resin contained per unit volume is larger on the back sheet 30 side than on the top sheet 20 side. Moreover, the weight of the absorptive fiber contained per unit volume is larger on the top sheet 20 side than on the back sheet 30 side. In the absorbent body 40B, the upper half region on the top sheet 20 side contains 40% by weight or less of the absorbent resin, and the lower half region on the back sheet 30 side absorbs 60% by weight or more of the whole. Desirably, a functional resin is included. Further, in the absorbent body 40B, the upper half region on the top sheet 20 side contains 60% by weight or more of absorbent fibers, and the lower half region on the back sheet 30 side has 60% by weight or less. It is desirable that the absorbent fiber is contained.

  The absorber 40B supplies finely pulverized absorbent fibers and absorbent resin into a chamber opened toward the suction drum, and sprays them from the chamber onto the surface of the rotating suction drum. It is produced by adsorbing and depositing and forming into a sheet shape. If the opening area of at least one of the absorbent fiber supply port and the absorbent resin supply port in the chamber is changed during the deposition of the material and the mixing ratio thereof is changed, respectively, in the thickness direction of the absorber 40B, respectively. The weight contained per unit volume can be changed. The opening area of the supply port can be changed using, for example, a movable partition plate provided in the chamber or in each supply port. Further, during the deposition of the material, the same action can be obtained by displacing the position of each material supply port in the chamber relative to the suction drum. In addition, a plurality of chambers are arranged in the rotation direction of the suction drum, and a material having a different mixing ratio of the absorbent fiber and the absorbent resin is supplied from each chamber, so that the mixing ratio of the absorbent fiber and the absorbent resin is different. A plurality of layers may be stacked.

  In the absorber 40B, by increasing the content of the absorbent resin toward the back sheet 30 side, the liquid can be guided to the back sheet 30 side, and the movement of the liquid to the diffusion layer 50 is promoted. Therefore, the diffusion movement of the liquid through the diffusion layer 50 is promoted. Moreover, the area | region where the liquid is hold | maintained in the absorber 40B can be released | separated from the top sheet 20, and the return of the liquid to the top sheet 20 side can be suppressed.

  As described above, according to the absorbent article 10B of the second embodiment, the absorber 40B can be provided with a structure for guiding liquid from the top sheet 20 side to the back sheet 30 side, and absorption of the liquid Performance and holding performance can be further increased. In addition, according to the absorbent article 10 </ b> B of the second embodiment, various effects described in the first embodiment can be achieved.

C. Third embodiment:
FIG. 5 is a schematic cross-sectional view showing a configuration of an absorbent article 10C as the third embodiment of the present invention. The absorbent article 10C of the third embodiment has substantially the same configuration as the absorbent article 10A of the first embodiment, except that the configuration of the diffusion layer 50C is different.

  The diffusion layer 50C of the third embodiment has a corrugated concavo-convex structure that repeats the rising and sinking in the thickness direction in the width direction (the direction of the arrow Y). Due to this concavo-convex structure, diffusion layer recesses 51 and 52 that are recessed in the thickness direction are formed on both sides of the diffusion layer 50C. The diffusion layer recess 51 is a recess that is recessed toward the back sheet 30 on the surface of the diffusion layer 50C on the absorber 40 side. The diffusion layer recess 52 is a recess that is recessed toward the absorber 40 on the surface of the diffusion layer 50C on the backsheet 30 side. The uneven structure of the diffusion layer 50C can be formed by embossing, pressing, or sonic processing. In addition, the base material constituting the diffusion layer 50C may be formed in advance so as to have such a concavo-convex structure. The diffusion layer 50C may have a corrugated concavo-convex structure that repeatedly rises and sinks in the thickness direction in the length direction (the direction of the arrow X). The diffusion layer 50 </ b> C is bonded to the core wrap sheet 41 at a portion protruding toward the absorber 40.

  The concavo-convex structure of the diffusion layer 50C illustrated in FIG. 5 is a shape when the diffusion layer 50C is manufactured. After the diffusion layer 50C is assembled to the absorbent article 10C, the uneven structure of the diffusion layer 50C is crushed. Still, since the diffusion layer recess 51 is formed on the surface of the diffusion layer 50C on the absorber 40 side, a gap is formed between the absorber 40 and the absorber 40 so that the flow resistance is small and the liquid can easily enter. In addition, the fluidity of the liquid between the diffusion layer 50C and the absorber 40 is improved. Further, in the diffusion layer 50C of the third embodiment, as described above, the diffusion layer recess 52 is also formed on the surface on the back sheet 30 side, and the diffusion layer 50C and the diffusion layer 50C are also formed by the gap generated by the diffusion layer recess 52. The fluidity of the liquid between the back sheet 30 is improved.

  According to the absorbent article 10 </ b> C of the third embodiment, at least the gap layer formed between the absorber 40 and the diffusion layer 50 </ b> C by the diffusion layer recess 51 is liquid in a direction along the lower surface of the absorber 40. It functions as a flow path for moving. Therefore, the area | region where the liquid is absorbed in the absorber 40 can be expanded further. In addition, according to the absorbent article 10C of the third embodiment, various effects described in the first embodiment can be achieved.

D. Fourth embodiment:
With reference to FIG. 6 and FIG. 7, an absorbent article 10 </ b> D as a fourth embodiment of the present invention will be described. FIG. 6 is a schematic plan view showing the configuration of the absorbent article 10D of the fourth embodiment. FIG. 7 is a schematic cross-sectional view of the absorbent article 10D taken along the line 7-7 shown in FIG. FIG. 7 shows a broken-line arrow schematically showing an example of the moving direction of the liquid. The absorbent article 10D of the fourth embodiment has substantially the same configuration as the absorbent article 10A of the first embodiment except that the configuration of the absorbent body 40D is different.

  As shown in FIG. 7, the absorbent body 40D of the fourth embodiment compresses the absorbent body 40D in the thickness direction on the back sheet 30 side surface in addition to the groove portion 42 formed on the top sheet 20 side surface. The back surface side recessed part 45 formed in this way is provided. The back surface side recess 45 is formed by, for example, embossing. The compression part 46 which is a part on the back surface side recessed part 45 in the absorber 40D is squeezed so that its density is higher than parts other than the compression part 46 and the groove part 43. Therefore, as with the lower groove portion 43, the liquid is easily collected in the compression portion 46.

  The back surface side concave portion 45 is formed by pressing the absorber 40D from above the core wrap sheet 41 arranged so as to overlap the absorber 40D. Therefore, a part of the core wrap sheet 41 enters the back side recess 45. Thereby, the adhesiveness of absorber 40D and the core wrap sheet | seat 41 is improved.

  In FIG. 6, for convenience, the formation position of the back surface side recess 45 is illustrated by a broken line. The back side recess 45 is formed in a region overlapping the diffusion layer 50 when viewed from the absorber 40D toward the diffusion layer 50. The back surface side recess 45 is formed as a plurality of parallel linear grooves. Each groove part which comprises the back side recessed part 45 cross | intersects in a grid | lattice form. Each groove portion constituting the back surface side recess 45 is provided at a position shifted from each groove portion 42 when viewed in the direction from the absorber 40 </ b> D toward the diffusion layer 50, and extends so as to intersect the groove portion 42. . More specifically, each groove part constituting the back surface side recessed part 45 extends substantially parallel to the two groove parts 42 between two adjacent groove parts 42.

  According to the absorbent article 10D of the fourth embodiment, in the region around the groove portion 42 of the absorbent body 40D, the liquid is directed from the surface on the topsheet 20 side toward the compression site 46 where the capillary force is increased by pressing. It is guided. Then, the liquid that has oozed out from the compressed portion 46 into the back surface side recess 45 flows into the flow path space between the absorber 40 and the diffusion layer 50 formed by the back surface side recess 45, and enters the back surface side recess 45. It is diffused along and held in the back surface side recess 45. Thus, the liquid absorption performance and retention performance of the absorbent article 10 </ b> D are enhanced by the back surface side recess 45. The back surface side recessed part 45 is not limited to the groove-shaped structure shown by FIG. 6 and FIG. 7, For example, the following structures can also be employ | adopted.

  With reference to FIG. 8 and FIG. 9, the structure of the back surface side recessed part 45a as another structural example is demonstrated. FIG. 8 is a schematic front view of an absorbent article 10Da including an absorbent body 40Da provided with a back surface side recess 45a. FIG. 9 is a schematic cross-sectional view of the absorbent article 10Da taken along the line 9-9 shown in FIG. FIGS. 8 and 9 are substantially the same as FIGS. 6 and 7 except that a back surface side recess 45a having a different configuration is shown.

  In this configuration example, the back surface side recess 45a is configured as a plurality of parallel grooves extending linearly in the direction of the arrow Y. As shown in FIG. 8, the grooves constituting the back-side concave portion 45 a intersect in a lattice pattern on the surface of the absorber 40 on the top sheet 20 side when viewed in the direction from the absorber 40 toward the diffusion layer 50. It passes through each crossing point of the groove part 42 which is. Even with the configuration of the back surface side recess 45a, the same effect as that of the back surface side recess 45 described with reference to FIGS. 6 and 7 can be obtained.

  With reference to FIG. 10 and FIG. 11, the structure of the back surface side recessed part 45b as another example of another structure is demonstrated. FIG. 10 is a schematic front view of an absorbent article 10Db including an absorbent body 40Db provided with a back surface side recess 45b. FIG. 11 is a schematic cross-sectional view of the absorbent article 10Db taken along the line 11-11 shown in FIG. FIGS. 10 and 11 are substantially the same as FIGS. 6 and 7 except that a back-side recess 45b having a different configuration is shown.

  In this configuration example, the back surface side recesses 45b are formed as a plurality of scattered depressions. As shown in FIG. 10, each of the dents constituting the back surface side recess 45 b is a lattice on the top sheet 20 side surface of the absorber 40 when viewed in the direction from the absorber 40 toward the diffusion layer 50. It is formed in a square surrounded by the groove portions 42 intersecting in a shape. If it is the structure of the back surface side recessed part 45b, while the movement of the liquid into the back surface side recessed part 45b is accelerated | stimulated by capillary action, a liquid can be hold | maintained in the back surface side recessed part 45b.

  As described above, according to the absorbent article 10D of the fourth embodiment, the liquid absorption performance and the retention performance are provided by the back surface side concave portions 45, 45a, 45b formed on the back sheet 30 side surface of the absorber 40D. Enhanced. In addition, according to the absorbent article 10D of the fourth embodiment, various functions and effects similar to those described in the first embodiment can be achieved.

E. Variations:
The configuration described in each of the above embodiments can be modified as follows. In the following description, unless otherwise specified, the absorbent articles 10A to 10D, 10Da, and 10Db described in the above embodiments are referred to as “absorbent articles 10” without being distinguished. Similarly, the absorbers 40, 40B, 40D, 40Da, and 40Db are also referred to as “absorber 40” without distinction, and the diffusion layers 50 and 50C are referred to as “diffusion layer 50” without distinction. .

E1. Modification 1:
In each of the above embodiments, each absorber 40 is formed with a plurality of parallel linear groove portions 42 that intersect in a substantially lattice shape. The configuration of the groove portion 42 is the same as that of each of the above embodiments. There is no limit. The groove portion 42 may not be formed in a straight line shape, and may be formed in a curved shape, for example. Further, the width of the groove 42 may not be constant, and may vary from part to part. The groove portions 42 do not have to cross in a lattice pattern, for example, may cross in a mesh pattern, or all the groove portions 42 may intersect at one point and extend radially. The groove portions 42 may be formed so as not to cross each other. For example, all the groove portions 42 may extend in parallel with each other, or all the groove portions 42 may extend radially without crossing each other. Also good. The plurality of groove portions 42 may have different depths, or the depth may vary from place to place. In each of the above embodiments, the groove portion 42 is formed by compressing the absorber 40 in the thickness direction, and has a portion where the density is locally increased below. On the other hand, the groove part 42 does not need to be formed by compressing the absorber 40 in the thickness direction, and may not have a part where the density is locally increased below. The groove part 42 may be formed by reducing the amount of the constituent material of the absorber 40 as compared with other parts. Even in such a configuration, the liquid that has permeated the lower part of the groove part 42 can be diffused by the diffusion layer 50 to parts other than the lower part of the groove part 42.

E2. Modification 2:
In each of the above embodiments, the diffusion layer 50 is partially bonded to the core wrap sheet 41 of the absorber 40. On the other hand, the diffusion layer 50 may be disposed in a state in which the entire diffusion layer 50 is not adhered to the core wrap sheet 41, that is, in a state in which the diffusion layer 50 is not restrained with respect to the absorber 40. Thereby, the diffusion layer 50 can be formed more easily.

E3. Modification 3:
In each of the above embodiments, the absorber 40 is wrapped in the core wrap sheet 41. On the other hand, the absorber 40 does not need to be wrapped in the core wrap sheet 41. The core wrap sheet 41 may be omitted. In this case, the diffusion layer 50 may be disposed so as to be in direct contact with the absorber 40.

E4. Modification 4:
In each of the above-described embodiments, the core wrap sheet 41 is configured by a single sheet-like member. On the other hand, the core wrap sheet 41 may be configured by stacking a plurality of sheet-like members. In this configuration, the core wrap sheet 41 is doubly stacked below the absorber 40, and the sheet-like member that forms the lower layer covers the surface of the absorber 40 on the top sheet 20 side. When arranged so as not to cover, the sheet can be interpreted as the diffusion layer 50.

E5. Modification 5:
In the absorbent article 10 of each of the embodiments described above, the surface groove portion 22 is formed in which a part of the top sheet 20 enters the groove portion 42. On the other hand, the surface groove part 22 does not need to be formed in the absorbent article 10. Such a configuration can be realized by a step of laminating the top sheet 20 on the absorber 40 after forming the groove 42 in the absorber 40.

E6. Modification 6:
In the absorber 40B in the second embodiment, the weight of the absorbent resin contained per unit volume is changed in the thickness direction. The absorber 40B may be configured by, for example, a multilayer structure in which a plurality of sheet-like absorbers having different weights of the absorbent resin contained per unit volume are stacked.

E7. Modification 7:
In the third embodiment, the diffusion layer recess 51 is recessed on the back sheet 30 side on the surface of the diffusion layer 50C on the absorber 40 side by having an uneven structure in which the diffusion layer 50C is uneven in a corrugated shape. Is formed. In contrast, the diffusion layer recess 51 may be formed without making the diffusion layer 50C corrugated. For example, the diffusion layer recess 51 may be formed by pressing the diffusion layer 50C to locally reduce the thickness. Alternatively, the diffusion layer recess 51 may be formed by locally thinning the diffusion layer 50C by cutting or melting. Moreover, in said 3rd Embodiment, the diffusion layer recessed part 52 dented on the opposite side to the diffusion layer recessed part 51 is formed in the surface at the side of the back sheet 30 of the diffusion layer 50C. The diffusion layer recess 51 on the absorber 40 side may be omitted from the diffusion layer 50C, and only the diffusion layer recess 52 on the back sheet 30 side described above may be formed.

E8. Modification 8:
In the fourth embodiment, the configuration of the three types of the back side recesses 45, 45a, 45b is described. On the other hand, the back surface side recessed part which has another structure may be formed in the surface at the side of the diffusion layer 50 of the absorber 40. FIG. For example, the back surface side recess may be formed as a groove portion having various configurations as described in the modification example 2 as a modification example of the groove portion 42. The back surface side concave portion may be formed as a concave portion having a substantially rectangular opening shape or a concave portion having another polygonal opening shape.

E9. Modification 9:
The absorbent article 10 according to each of the above embodiments is configured as a tape-type paper diaper. On the other hand, the absorbent article 10 may not be configured as a tape-type paper diaper, and may be configured as, for example, a pants-type paper diaper. The absorbent article 10 is not limited to a paper diaper, and may be configured as a urine collection pad, a napkin, or other sanitary products, or a cleaning product that absorbs sewage other than a paper diaper. .

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

10A, 10B, 10C, 10D, 10Da, 10Db ... Absorbent article 11 ... Front part 12 ... Middle part 13 ... Rear part 20 ... Top sheet 22 ... Surface groove part 30 ... Back sheet 40, 40B, 40D, 40Da, 40Db ... Absorber 41 ... Core wrap sheet 42 ... Groove part 43 ... Sub-groove parts 45, 45a, 45b ... Back side concave part 46 ... Compression part 50, 50C ... Diffusion layer 51, 52 ... Diffusion layer concave part 60 ... Cover sheet 61 ... Constricted part 62 ... Elastic member 63 ... fixing tape 64 ... fixing portion 65 ... elastic member 70 ... side sheets 71, 72 ... end 73 ... elastic member

Claims (5)

An absorbent article that absorbs and holds liquid,
A first sheet having hydrophilicity and transmitting the liquid in the thickness direction;
A second sheet having liquid impermeability;
An absorbent body that is sandwiched between the first sheet and the second sheet and absorbs and holds the liquid that has passed through the first sheet;
With
A groove is provided on the surface of the absorber on the first sheet side,
Between the second sheet and the absorber, a diffusion layer having a hydrophilic property and diffusing the liquid that has passed through the absorber to the second sheet side is formed from the absorber to the diffusion layer. Is provided at a position overlapping the groove when viewed in the direction toward
The base material which comprises the said diffused layer is an absorbent article arrange | positioned so that the surface at the side of the said 1st sheet | seat of the said absorber may not be coat | covered. The absorbent article according to claim 1,
The absorber includes an absorbent resin that is a resin material having the property of absorbing and holding the liquid,
In the absorbent body, an absorbent article in which the weight of the absorbent resin contained per unit volume is larger on the second sheet side than on the first sheet side. The absorbent article according to claim 1 or 2,
On the surface of the absorbent body on the second sheet side, a back surface-side concave portion, which is a concave portion formed by compressing the absorbent body, is seen when viewed in the direction from the absorbent body toward the diffusion layer. Absorbent article provided in the area that overlaps. It is an absorptive article according to any one of claims 1 to 3,
The said diffusion layer is an absorptive article which has the diffusion layer recessed part dented in the thickness direction. The absorbent article according to any one of claims 1 to 4,
The said diffusion layer is an absorptive article comprised by the member which the said hydrophilic property does not fall easily, when absorption of the said liquid is repeated rather than the member which comprises the said 1st sheet | seat.

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