JP6840949B2 - Absorbent article - Google Patents

Description

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

As absorbent articles, for example, disposable diapers, urine absorbing pads, napkins, and the like that absorb and retain liquid components excreted from the wearer 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 topsheet comes into direct contact with the wearer's skin when the wearer wears the absorbent article. The top sheet has a liquid permeability that allows liquid to permeate, and permeates the liquid component excreted from the wearer's body in the thickness direction. The absorber is laminated on the top sheet and absorbs and retains the liquid component that has passed through the top sheet. The backsheet is located on the opposite side of the topsheet with the absorber in between. The back sheet has a liquid impermeable property that the liquid does not permeate, and prevents the liquid component from leaking to the outside.

Japanese Unexamined Patent Publication No. 2003-333390 JP-A-2015-66375

In an absorbent article, it is desirable that the liquid holding area in the absorber be widened in order to increase the amount of the liquid that can be absorbed and held. In the techniques of Patent Documents 1 and 2 described above, a diffusion layer for diffusing the liquid is provided on the backsheet side surface of the absorber so that the liquid absorbed by the absorber can be distributed to the absorber. .. However, as in the techniques of Patent Documents 1 and 2, if only the diffusion layer is provided on the back sheet side of the absorber, the liquid may not reach the diffusion layer and the function of the diffusion layer may not be fully exhibited. As described above, in the absorbent article, there is still room for improvement in the technique of distributing the liquid to the absorber to increase the amount of the liquid that can be absorbed and retained.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following forms.
[Form 1] An absorbent article that absorbs and retains a liquid.
A first sheet having hydrophilicity and allowing the liquid to permeate in the thickness direction,
A second sheet that is impermeable to liquid and
An absorber that is sandwiched between the first sheet and the second sheet and absorbs and holds the liquid that has passed through the first sheet inside.
With
A groove is provided on the surface of the absorber on the first sheet side.
A diffusion layer that has hydrophilicity between the second sheet and the absorber and diffuses the liquid that has permeated to the second sheet side via the absorber is formed from the absorber to the diffusion layer. It is provided at a position where it overlaps with the groove when viewed in the direction toward
The base material constituting the diffusion layer is arranged so as not to cover the surface of the absorber on the first sheet side.
A core wrap sheet, which is a single member that encloses the entire absorber, is further provided.
The diffusion layer is partially adhered to the core wrap sheet.
The diffusion layer is an absorbent article made of a member having a higher hydrophilicity than the core wrap sheet.

[1] According to one embodiment of the present invention, there is provided an absorbent article that absorbs and retains a liquid. The absorbent article comprises a first sheet, a second sheet, and an absorber. The first sheet has hydrophilicity and allows the liquid to permeate in the thickness direction. The second sheet is liquid impermeable. 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 inside. A groove is provided on the surface of the absorber on the first sheet side. A diffusion layer that has hydrophilicity and diffuses the liquid that has permeated to the second sheet side via the absorber is provided between the second sheet and the absorber. The diffusion layer is at 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 this form of absorbent article, the liquid can be guided along the groove, and the area where the liquid is absorbed can be widened on the first sheet side of the absorber. It is also possible to guide the liquid absorbed by the absorber and collected in the portion below the groove toward the diffusion layer to diffuse it, and guide it to a portion other than the portion below the groove. Therefore, the area where the liquid is absorbed can be expanded also on the second sheet side of the absorber. In addition, the base material constituting the diffusion layer is arranged so as not to cover the surface of the absorber on the first sheet side. Therefore, it is suppressed that the liquid that has reached the diffusion layer passes through the base material constituting the diffusion layer and spreads over the entire surface of the absorber on the first sheet side. In addition, it is possible to prevent the base material from being wastedly used in a portion where the function as a diffusion layer cannot be achieved.

[2] In the absorbent article of the above form, the absorber contains an absorbent resin which is a resin material having a property of absorbing and retaining the liquid, and the absorbent contained in the absorber per unit volume. The weight of the resin is heavier on the second sheet side than on the first sheet side. According to this form of the absorbent article, the liquid absorbed by the absorber can be guided toward the diffusion layer on the second sheet side. In addition, it is possible to prevent the liquid absorbed by the absorber from returning to the first sheet side.

[3] In the absorbent article of the above form, on the surface of the absorber on the second sheet side, a recess on the back surface side, which is a recess formed by compressing the absorber, is formed from the absorber to the diffusion layer. It may be provided in a region that overlaps with the diffusion layer when viewed in the direction toward. According to the absorbent article of this form, since a portion where the density is increased and the capillary force is increased by compression is formed on the first sheet side of the recess on the back surface side, the absorber from the first sheet side is formed. The absorption of liquid into is promoted. Further, the recess on the back surface side allows the liquid to be diffused through the gap formed between the absorber and the diffusion layer as a flow path, and the region where the liquid is absorbed can be expanded.

[4] In the absorbent article of the above form, 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 through the gap formed by the recess of the diffusion layer 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 of the above form, the diffusion layer may be composed of a member whose hydrophilicity is less likely to decrease when the absorption of the liquid is repeated than the member constituting the first sheet. According to this form of absorbent article, when the liquid is locally repeatedly absorbed in the first sheet, the hydrophilicity of the portion of the first sheet where the liquid is repeatedly absorbed is the hydrophilicity of the diffusion layer. Decreases before it declines. Then, at the time of subsequent liquid absorption, the liquid can be guided to a portion where the hydrophilicity remains high other than the portion where the hydrophilicity is lowered and absorbed by the absorber on the first sheet. .. The liquid can be diffused over a wide range by the diffusion layer that retains hydrophilicity. Therefore, in a situation where the liquid is repeatedly absorbed, the area where the liquid is absorbed can be expanded.

The plurality of components of each form of the present invention described above are not all essential, and may be used to solve some or all of the above-mentioned problems, or part or all of the effects described herein. In order to achieve the above, it is possible to change, delete, replace some of the plurality of components with new other components, and partially delete the limited contents, as appropriate. In addition, in order to solve a part or all of the above-mentioned problems, or to achieve a part or all of the effects described in the present specification, the technical features included in the above-mentioned embodiment of the present invention. It is also possible to combine some or all with some or all of the technical features contained in the other embodiments of the invention described above to form an independent embodiment of the invention.

The present invention can be realized as various forms of absorbent articles. For example, it can be realized in the form of diapers including tape type and pants type, urine absorbing pads, napkins, and other sanitary products. The present invention can also be realized in a form other than an absorbent article for treating the wearer's excrement.

The schematic plan view which shows the absorbent article of 1st Embodiment. The schematic sectional view of the absorbent article of 1st Embodiment. Explanatory drawing which shows typically the behavior of a liquid between an absorber and a diffusion layer. Schematic cross-sectional view of the absorbent article of the second embodiment. Schematic cross-sectional view of the absorbent article of the third embodiment. The schematic plan view which shows the absorbent article of 4th Embodiment. FIG. 6 is a schematic cross-sectional view of the absorbent article of the fourth embodiment. FIG. 3 is a schematic plan view showing another configuration example of the back surface side recess of the fourth embodiment. FIG. 6 is a schematic cross-sectional view showing another configuration example of the back surface side recess of the fourth embodiment. FIG. 3 is a schematic plan view showing another configuration example of the back surface side recess of the fourth embodiment. FIG. 6 is a schematic cross-sectional view showing another configuration example of the back surface side recess of the fourth embodiment.

A. First Embodiment:
The absorbent article 10A as the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic plan view showing the absorbent article 10A of the first embodiment. FIG. 2 is a schematic cross-sectional view of the absorbent article 10A in the 2-2 cutting shown in FIG. 1 and 2 show arrows X, Y, Z indicating three directions orthogonal to each other with respect to the absorbent article 10A. 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 shown so as to correspond to other figures. FIG. 1 shows the 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, each member constituting the absorbent article 10A is shown in a separated state. All schematic cross-sectional views referred to herein are similarly illustrated.

The absorbent article 10A of the present embodiment is a so-called tape-type disposable diaper and has a strip-shaped shape (FIG. 1). When worn by the wearer, the absorbent article 10A is applied from the ventral side to the dorsal side of the wearer so as to cover the wearer's inseam and is taped. For convenience of explanation, the absorbent article 10A is divided into a front portion 11, a middle portion 12, and a rear portion 13 in order in the longitudinal direction according to the arrangement position when worn by the wearer. The front portion 11, the middle portion 12, and the rear portion 13 indicate the names of the absorbent articles 10A for each part, and do not indicate the names of the members constituting the absorbent article 10A. The front portion 11 illustrated on the lower side of the paper is a portion arranged on the abdominal side of the wearer. The central portion 12 illustrated around the center of the paper is a portion arranged around the inseam of the wearer. The rear portion 13 illustrated on the upper side of the paper surface is a portion arranged on the back side of the wearer.

Here, the directions indicated by the arrows X, Y, and Z will be described. The arrow X indicates the direction along the longitudinal direction of the absorbent article 10A in the unfolded state, and indicates the direction from the rear portion 13 to the front portion 11. Hereinafter, the 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 lateral direction of the absorbent article 10A in the unfolded 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, the direction parallel to the direction of the arrow Y is also referred to as a "width direction". The 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 10A, the term "up" means the direction side indicated by the arrow Z, and the term "down" means the opposite direction side.

The absorbent article 10A includes a top sheet 20, a back sheet 30, and an absorber 40 (FIG. 2). The top sheet 20 is a sheet-like member that comes into direct contact with the wearer's skin when worn by the wearer. The top sheet 20 is arranged on the absorber 40 so as to cover the entire absorber 40. The top sheet 20 has at least hydrophilicity on the surface in contact with the wearer's skin. Further, the top sheet 20 has a liquid permeability that allows liquid to permeate at least in the thickness direction thereof. When the absorbent article 10A is used, the liquid which is a liquid component of the excrement excreted on the top sheet 20 permeates the top sheet 20. The top sheet 20 corresponds to the subordinate concept of the first sheet in the present invention.

The top sheet 20 is made of, for example, a woven fabric, a non-woven fabric, a porous film, a net-like sheet having a mesh, or the like. The top sheet 20 is preferably made of a non-woven fabric in consideration of liquid permeability and good touch. As the non-woven fabric, for example, a spunbonded non-woven fabric, a needle punched non-woven fabric, a spunlace non-woven fabric, an air-through non-woven fabric and the like can be adopted.

The back sheet 30 is a sheet-like member that is laminated so as to overlap the top sheet 20 with the absorber 40 interposed therebetween. The back sheet 30 has liquid impermeable property and functions as a waterproof sheet that suppresses the liquid absorbed by the absorber 40 from leaking to the outside. The back sheet 30 is arranged 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 the subordinate concept of the second sheet in the present invention.

The back sheet 30 can be made 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 non-woven fabric and a synthetic resin film, such as a sheet in which a breathable synthetic resin film is sandwiched between a non-woven fabric such as spunbond. It is desirable that the back sheet 30 has so-called moisture permeability, which does not allow the permeation of liquid water but allows the permeation of water vapor. The back sheet 30 may be made of a moisture-permeable liquid-impermeable film such as a microporous polyethylene film having fine pores of 0.1 to 0.5 μm.

As described above, the absorber 40 is sandwiched between the top sheet 20 and the back sheet 30. The absorber 40 absorbs and holds the liquid that has passed through the top sheet 20 inside. In the present embodiment, the absorber 40 is in the form of a flat sheet, and is arranged at least at a position where the absorbent article 10A can cover the wearer's inseam when worn by the wearer. In FIG. 1, the outer peripheral contour line of the absorber 40 is illustrated by a alternate long and short dash line. The top sheet 20 and the back sheet 30 are joined to each other on the outer periphery of the absorber 40. The joint (not shown) between the top sheet 20 and the back sheet 30 surrounds the outer periphery of the absorber 40 so that the absorber 40 is sealed inside the absorbent article 10A.

The absorber 40 is composed of an absorbent fiber which is a fiber material capable of absorbing a liquid and an absorbent resin which is a resin material having a property of absorbing and holding a 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 gaps between the fibers in the absorbent fibers, and the liquid is also absorbed and held by the absorbent resin existing in the gaps. The absorber 40 is not limited to the configuration in which the absorbent resin is arranged between the absorbent fibers. The absorber 40 may be formed by combining a fiber member made of an absorbent fiber and a resin member made of an absorbent resin. For example, the absorbent body 40 may be configured as a laminate of a resin sheet obtained by molding an absorbent resin into a sheet shape and a fiber sheet obtained by molding an absorbent fiber into a sheet shape.

In this embodiment, the absorbent fiber is composed of fluff pulp (cotton-like pulp). Absorbent fibers are hydrophilic to pulp fibers other than fluff pulp, short fibers of cellulose-based fibers such as rayon fibers or cotton fibers (fiber length of 5 mm or less), and synthetic fibers such as polyethylene, polypropylene, and 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.

The absorbent resin is composed of, for example, a hydrophilic polymer having a crosslinked structure capable of absorbing and retaining water. The absorbent resin is preferably composed of a super absorbent polymer (SAP). The absorbent resin may be composed of a starch-based, cellulosic-based, or synthetic polymer-based resin. More specifically, the absorbent resin includes a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-ethyl acrylate graft copolymer, a saponified product of a starch-methyl methacrylate graft copolymer, and starch. -Acrylonitrile graft copolymer saponified product, starch-acrylamide graft copolymer saponified product, polyacrylic acid (salt), cross-linked polyethylene oxide with acrylic acid, cross-linked product of sodium carboxymethyl cellulose, polyvinyl alcohol-maleic anhydride It may be composed of a crosslinked product of a reaction product or the like.

In the present embodiment, the absorber 40 is entirely wrapped by the core wrap sheet 41. The core wrap sheet 41 has a function of retaining the shape of the absorber 40. In FIG. 2, for convenience, the absorber 40 and the core wrap sheet 41 are shown separately, but the core wrap sheet 41 is closely adhered to and integrated with the surface of the absorber 40. The core wrap sheet 41 is composed of a sheet-like member having hydrophilicity and liquid permeability. The core wrap sheet 41 may be formed of a single sheet-shaped member, or may be formed by combining a plurality of sheet-shaped members.

The core wrap sheet 41 is made of a paper member such as tissue paper. As the tissue paper, one having a basis weight of 10 to 30 g / m ² may be adopted. The core wrap sheet 41 may be made of a non-woven fabric. As the non-woven fabric, spunbonded non-woven fabric, needle punched non-woven fabric, spunlace non-woven fabric, air-through non-woven fabric and the like may be adopted. As the non-woven fabric, for example, a multilayer structure in which a plurality of types of non-woven fabrics are laminated, such as an SMS non-woven fabric in which melt blown is sandwiched between spunlace non-woven fabrics, may be adopted.

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

In the present embodiment, when the absorber 40 is wrapped in the core wrap sheet 41 and the top sheet 20 is arranged on the core wrap sheet 41, the groove portion 42 is formed by pressing the absorber 40 together with the top sheet 20. Will be done. As a result, 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. Further, as shown in FIGS. 1 and 2, a surface groove portion 22 overlapping 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 referred to, they are also referred to as “groove portions 22, 42”.

In the present embodiment, the groove portions 22 and 42 extend in an oblique direction intersecting in the length direction and the width direction and intersect in a grid pattern (FIG. 1). It is desirable that the grooves 22 and 42 are formed from the front portion 11 to the rear portion 13 at least in the central region in the width direction. The grooves 22 and 42 may be formed over the entire surface of the wearer facing the skin, or may be formed over the entire surface of the absorber 40. The grooves 22 and 42 function as a flow path that guides the liquid to diffuse along the upper surface of the absorber 40. Further, the grooves 22 and 42 also have a function of making the absorber 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 the air permeability in the space between the wearer and the top sheet 20.

In the absorbent article 10A, a diffusion layer 50 is provided between the back sheet 30 and the absorbent body 40. More specifically, the diffusion layer 50 is arranged between the back sheet 30 and the core wrap sheet 41 arranged under the absorber 40. The diffusion layer 50 is arranged at a position overlapping the groove 42 of the absorber 40 when viewed in the direction opposite to the arrow Z, which is the direction from the absorber 40 toward the diffusion layer 50. It is desirable that the diffusion layer 50 is provided so as to cover the entire region where the groove portion 42 of the absorber 40 is formed. In FIG. 1, the outer peripheral contour line 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 42 of the absorber 40 and the diffusion layer 50, and the details thereof will be described later.

The diffusion layer 50 is composed of a sheet-like member having hydrophilicity and having liquid diffusivity capable of diffusing the liquid inside. It is desirable that the diffusion layer 50 has high liquid diffusivity in the direction along the surface. The diffusion layer 50 is made of, for example, a paper member such as tissue paper, a non-woven fabric, or the like. In particular, it is desirable to use a bulky air-through non-woven fabric or a chemical-bonded non-woven fabric ^{having a basis weight of about 15 to 40 g / m 2.} It is desirable that the diffusion layer 50 is composed of at least a member that is less likely to reduce hydrophilicity and liquid diffusivity even if the liquid is absorbed and diffused a plurality of times, rather than the member that constitutes the top sheet 20. The reason for this will be described later. If the bulky air-through non-woven fabric or ^{the chemical bond non-woven fabric having a basis weight of about 15 to 40 g / m 2} is used, the durability of such hydrophilicity and liquid diffusivity 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 the region sandwiched between the absorber 40 and the back sheet 30. As a result, the diffusion layer 50 can be formed only by arranging the sheet-like member between the absorbent body 40 and the back sheet 30, so that the production of the absorbent article 10A is facilitated. The base material constituting the diffusion layer 50 does not have to be contained in the region sandwiched between the absorber 40 and the back sheet 30. The outer peripheral end portion of the base material constituting the diffusion layer 50 may extend outward from the outer peripheral end portion of the absorber 40, or may be folded back toward the surface of the absorber 40 on the top sheet 20 side. Good. The base material constituting the diffusion layer 50 may be arranged so as not to completely cover the entire surface of the absorber 40 on the top sheet 20 side. As a result, it is suppressed that the liquid that has reached the diffusion layer 50 reverts 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. In addition, it is possible to prevent the base material constituting the diffusion layer 50 from being unnecessarily arranged in a portion that does not function as the diffusion layer 50. The base material constituting the diffusion layer 50 can be distinguished from the base material constituting the core wrap sheet 41 in that it is arranged so as not to cover at least the surface of the absorber 40 on the top sheet 20 side.

In this embodiment, the diffusion layer 50 is partially adhered to the core wrap sheet 41 of the absorber 40. As a result, 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. Therefore, when the diffusion layer 50 absorbs the liquid, the diffusion layer 50 is separated from the absorber 40 to form a minute gap through which the liquid can enter, and the liquid between the absorber 40 and the diffusion layer 50 is formed. Increased distribution and retention. 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. The portion of the diffusion layer 50 that can be separated from the absorber 40 may not be adhered 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 the 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 adopted. Further, when forming the groove 42 of the absorber 40, the diffusion layer 50 is arranged under the absorber 40 wrapped in the core wrap sheet 41, and the diffusion layer is generated by the pressing force when forming the groove 42. 50 may be crimped to the absorber 40 via the core wrap sheet 41. The diffusion layer 50 may be partially or wholly adhered to the back sheet 30 in order to suppress its misalignment. 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 above-mentioned bonding methods, or may be a different bonding method.

The absorbent article 10A further includes a cover sheet 60 and a side sheet 70. The cover sheet 60 is a sheet-like member arranged under the back sheet 30 (FIG. 2). The cover sheet 60 is located on the outermost side when the absorbent article 10A is worn by the wearer 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. It is desirable that the surface of the cover sheet 60 opposite to the absorber 40 is surface-treated so as to have a good feel.

The cover sheet 60 is made of, for example, a woven fabric or a non-woven fabric. As the non-woven fabric, a dry non-woven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester, a wet non-woven fabric, or the like can be adopted. 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.

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

In the absorbent article 10A, 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 inside, it is shown by a broken line in FIG. As shown in FIG. 2, the elastic member 62 is arranged between the cover sheet 60 and the side sheet 70. The elastic member 62 is made of a rubber thread, a stretchable non-woven fabric, a stretchable resin film, or the like. In the state of FIG. 1, the elastic member 62 is in an extended state. The elastic contraction of the elastic member 62 forms a gathered portion (so-called leg gather) that fits the base of the wearer's thigh. This leg gather suppresses the leakage of excrement from the constricted portion 61.

A fixing tape 63 is attached to the rear portion 13 of the cover sheet 60 so as to project in the direction of the arrow X at both end portions in the width direction (FIG. 1). Further, a fixing portion 64, which is also 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 formed of a hook-and-loop fastener. When the absorbent article 10A is worn by the wearer, the pair of fixing tapes 63 are respectively routed from the back side to the abdomen side of the wearer and attached to the fixing portion 64. As a result, the absorbent article 10A is fixed to the wearer.

An elastic member 65 is embedded between the pair of fixing tapes 63. The elastic member 65 is composed of, for example, a plurality of rubber threads arranged in parallel. The elastic member 65 is stretched in the direction of the arrow Y so that it can be elastically deformed in the width direction between the top sheet 20 and the cover sheet 60. In FIG. 1, the embedded elastic member 65 is shown by a broken line. In the state of FIG. 1, the elastic member 65 is in an extended state. The elastic member 65 elastically contracts in the width direction to form a so-called gathered portion (so-called waist gather) that fits around the wearer's waist. This waist gather prevents excrement from leaking from the back side of the wearer.

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 arranged above the top sheet 20 over the entire length direction. 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 composed of a sheet-like member having liquid impermeable properties. 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 central side in the width direction and is arranged on the top sheet 20. The end portion 72 can be moved away from the top sheet 20. The end portion 72 is doubly folded back, and a plurality of elastic members 73 are arranged inside the double structure. In FIG. 1, the elastic member 73 is shown by a broken line.

The elastic member 73 is stretched in the direction of the arrow X on the absorber 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 elastically contracts so that the end 72 side of the side sheet 70 rises from the surface of the top sheet 20 to form so-called three-dimensional gathers. The three-dimensional gather prevents excrement from leaking to the outer region of the absorber 40.

The absorption of the liquid through the grooves 22 and 42 will be described with reference to FIGS. 1 and 2. In the absorbent article 10A of the present embodiment, as described above, the groove 42 is formed on the surface of the absorber 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 on the surface groove portion 22. As a result, the liquid excreted from the wearer spreads along the grooves 22 and 42 on the surface of the absorber 40 on the top sheet 20 side, passes through the top sheet 20, and is absorbed by the absorber 40 (FIG. 1). ). As described above, in the absorbent article 10A of the present embodiment, the groove portions 22 and 42 widen the diffusion range of the liquid component on the top sheet 20 side.

Further, in the absorbent article 10A of the present embodiment, the groove 42 of the absorber 40 is formed by being compressed in the thickness direction of the absorber 40 (FIG. 2). Therefore, in the groove bottom portion 43 below the groove portion 42, the fiber density is locally increased and the gap between the fibers is reduced. As a result, the capillary force in the groove portion 43 is increased, and the absorption rate of the liquid through the groove portion 42 is increased. Therefore, the liquid component of the excrement existing on the surface of the top sheet 20 is reduced in a short time, and the wearer feels uncomfortable and the wearer's rough skin such as a rash is suppressed.

The behavior of the liquid between the absorber 40 and the diffusion layer 50 will be described with reference to FIG. In FIG. 3, a region near the groove 42 shown in FIG. 2 is extracted and shown. FIG. 3 shows a dashed arrow that schematically shows the movement path of the liquid.

Inside the absorbent body 40 in the absorbent article 10A of the present embodiment, the liquid tends to collect in the grooved portion 43 having a high capillary force. The liquid collected in the groove bottom portion 43 is guided to the hydrophilic diffusion layer 50 arranged under the groove, and inside the diffusion layer 50, along the thickness direction of the diffusion layer 50 and the lower surface of the absorber 40. It is diffused in the direction. A part of the liquid diffused in the diffusion layer 50 is guided to a portion of the absorber 40 other than the grooved portion 43 in which the amount of liquid contained is small. As described above, according to the absorbent article 10A of the present embodiment, the liquid collected in the grooved portion 43 of the absorber 40 can be guided to another portion via the diffusion layer 50. Therefore, the diffusion range of the liquid component is widened on the back sheet 30 side. In addition, it is possible to prevent the liquid collected in the groove bottom portion 43 from seeping out to the top sheet 20 side and returning.

In order to facilitate the movement of the liquid of the absorber 40 to the diffusion layer 50, it is desirable that the diffusion layer 50 is made of a member having a higher hydrophilicity than the core wrap sheet 41. Further, as described above, the diffusion layer 50 is composed of at least a member whose hydrophilicity and liquid diffusibility are less likely to decrease even if the liquid absorption / diffusion is repeated a plurality of times than the members constituting the top sheet 20. It is desirable to be done. With such a configuration, when the top sheet 20 repeatedly absorbs the liquid locally, the hydrophilicity of the portion of the top sheet 20 where the absorption of the liquid is repeated becomes the hydrophilicity of the diffusion layer 50. Decreases before it declines. 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 where the hydrophilicity remains high other than the portion where the hydrophilicity is lowered. The diffusion layer 50, which still retains hydrophilicity, allows the liquid to be diffused and retained over a wide range. 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 such that when the liquid is dropped onto the same site a plurality of times and the time until the liquid permeates the inside and disappears from the surface begins to increase. , It can be determined that it has decreased.

It is desirable that the grooves 22 and 42 are formed by the following steps.
Step 1: Prepare the absorber 40 in which the groove 42 is not formed, and wrap it with the 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 arranged under the back sheet 30, or the side sheet 70 may be arranged on the top sheet 20.
Step 3: The groove portions 22 and 42 are formed by pressing the absorber 40 from above the top sheet 20.
According to this step, when the grooves 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, by forming the surface groove portion 22 and the groove portion 42 at the same time, it is possible to visually inspect the press pattern formed on the absorber 40 in the manufacturing process.

As described above, according to the absorbent article 10A of the present embodiment, the liquid absorption performance and the holding performance are enhanced by having at least both the groove portion 42 and the diffusion layer 50 of the absorber 40. In addition, according to the absorbent article 10A of the present embodiment, it is possible to exert various effects described in the present embodiment.

B. Second embodiment:
FIG. 4 is a schematic cross-sectional view of the absorbent article 10B as the 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 absorber 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 absorber 40B of the second embodiment, the weight of the absorbent resin contained per unit volume changes in the thickness direction, and the weight of the absorbent fiber contained per unit volume also changes accordingly. ing. In the absorber 40B, the weight of the absorbent resin contained per unit volume on the back sheet 30 side is larger than that on the top sheet 20 side. Further, the weight of the absorbent fiber contained per unit volume is larger on the top sheet 20 side than on the back sheet 30 side. In the absorber 40B, the upper half region on the top sheet 20 side contains an absorbent resin of 40% by weight or less of the whole, and the lower half region on the back sheet 30 side absorbs 60% by weight or more of the whole. It is desirable that a sex resin is contained. Further, in the absorber 40B, the upper half region on the top sheet 20 side contains 60% by weight or more of the absorbent fibers, and the lower half region on the back sheet 30 side contains 60% by weight or less of the whole. It is desirable that the absorbent fiber is contained.

The absorber 40B supplies finely crushed absorbent fibers and absorbent resin into a chamber that opens 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 the fibers and forming them into a sheet. During the deposition of the material, if the opening areas of at least one of the absorbent fiber supply port and the absorbent resin supply port in the chamber are changed and the mixing ratio thereof is changed, each of them is changed in the thickness direction of the absorbent body 40B. The weight contained per unit volume of can be changed. The opening area of the supply port can be changed by using, for example, a movable partition plate provided in the chamber or in each supply port. Further, the same effect can be obtained by displacing the position of the supply port of each material in the chamber relative to the suction drum during the deposition of the material. In addition, a plurality of chambers are arranged in the rotation direction of the suction drum, and materials having different mixing ratios of absorbent fibers and absorbent resins are supplied from each chamber, and the mixing ratios of absorbent fibers and absorbent resins are different. A plurality of layers may be laminated.

By increasing the content of the absorbent resin toward the back sheet 30 side in the absorber 40B, 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. Further, the region where the liquid is held in the absorber 40B can be 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 have a structure for guiding the liquid from the top sheet 20 side to the back sheet 30 side, and can absorb the liquid. Performance and holding performance can be further improved. In addition, according to the absorbent article 10B of the second embodiment, various effects described in the first embodiment can be exhibited.

C. Third Embodiment:
FIG. 5 is a schematic cross-sectional view showing the configuration of the 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 structure of the diffusion layer 50C is different.

The diffusion layer 50C of the third embodiment has a corrugated plate-like concave-convex structure that repeats uplift and settling in the thickness direction in the width direction (direction of arrow Y). Due to this uneven structure, diffusion layer recesses 51 and 52 recessed in the thickness direction are formed on both side surfaces of the diffusion layer 50C. The diffusion layer recess 51 is a recess recessed on the back sheet 30 side 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 back sheet 30 side. The uneven structure of the diffusion layer 50C can be formed by embossing, pressing, or sonic processing. Further, the base material constituting the diffusion layer 50C may be preliminarily molded so as to have such an uneven structure. The diffusion layer 50C may have a corrugated plate-like concave-convex structure that repeats uplift and settling in the thickness direction in the length direction (direction of arrow X). The diffusion layer 50C is adhered to the core wrap sheet 41 at a portion protruding toward the absorber 40.

The uneven structure of the diffusion layer 50C shown in FIG. 5 is the shape of the diffusion layer 50C at the time of manufacture. After the diffusion layer 50C is assembled to the absorbent article 10C, the uneven structure of the diffusion layer 50C is in a crushed state. Even so, since the diffusion layer recess 51 is formed on the surface of the diffusion layer 50C on the side of the absorber 40, a gap is formed between the diffusion layer 50C and the absorber 40 because the flow path resistance is small and the liquid can easily enter. , The liquid flowability between the diffusion layer 50C and the absorber 40 is enhanced. 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 gap created by the diffusion layer recess 52 also causes the diffusion layer 50C. The flowability of the liquid with and from the back sheet 30 is enhanced.

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

D. Fourth Embodiment:
The absorbent article 10D as the fourth embodiment of the present invention will be described with reference to FIGS. 6 and 7. 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 in the 7-7 cutting 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 absorber 40D is different.

As shown in FIG. 7, in the absorber 40D of the fourth embodiment, in addition to the groove portion 42 formed on the surface on the top sheet 20 side, the absorber 40D is compressed on the surface on the back sheet 30 side in the thickness direction. It is provided with a back surface side recess 45 formed in the above. The back surface side recess 45 is formed by, for example, embossing. Since the compressed portion 46, which is a portion above the back surface side recess 45 in the absorber 40D, is squeezed, its density is higher than that of the portion other than the compressed portion 46 and the grooved portion 43. Therefore, the liquid is likely to collect in the compression portion 46 as in the groove bottom portion 43.

The back surface side recess 45 is formed by pressing the absorber 40D from above the core wrap sheet 41 arranged so as to be overlapped with the absorber 40D. Therefore, a part of the core wrap sheet 41 is inserted in the recess 45 on the back surface side. As a result, the adhesion between the absorber 40D and the core wrap sheet 41 is enhanced.

In FIG. 6, for convenience, the formation position of the back surface side recess 45 is shown by a broken line. The back surface 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 groove portions. The grooves forming the back surface side recess 45 intersect in a grid pattern. Each groove portion forming the back surface side recess 45 is provided at a position deviated from each groove portion 42 when viewed in the direction from the absorber 40D toward the diffusion layer 50, and extends so as to intersect the groove portion 42. .. More specifically, each groove portion forming the back surface side recess 45 extends substantially parallel to the two groove portions 42 between the two adjacent groove portions 42.

According to the absorbent article 10D of the fourth embodiment, in the region around the groove 42 of the absorber 40D, the liquid flows from the surface on the top sheet 20 side toward the compressed portion 46 where the capillary force is enhanced by squeezing. Is guided. Then, the liquid that has exuded from the compression 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 flows into the back surface side recess 45. It is diffused along and held in the back surface side recess 45. As described above, the liquid absorption performance and the holding performance of the absorbent article 10D are enhanced by the back surface side recess 45. The back surface side recess 45 is not limited to the groove-shaped configuration shown in FIGS. 6 and 7, and for example, the following configuration can be adopted.

The configuration of the back surface side recess 45a as another configuration example will be described with reference to FIGS. 8 and 9. FIG. 8 is a schematic front view of an absorbent article 10Da provided with an absorber 40Da provided with a recess 45a on the back surface side. FIG. 9 is a schematic cross-sectional view of the absorbent article 10Da in the 9-9 cut shown in FIG. 8 and 9, respectively, are substantially the same as FIGS. 6 and 7, except that the 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 groove portions extending linearly in the direction of the arrow Y. As shown in FIG. 8, each groove forming the back surface side recess 45a intersects in a grid 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 intersection of the groove portions 42. 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 FIGS. 10 and 11, the configuration of the back surface side recess 45b as another configuration example will be described. FIG. 10 is a schematic front view of the absorbent article 10Db including the absorber 40Db provided with the back surface side recess 45b. FIG. 11 is a schematic cross-sectional view of the absorbent article 10Db in the 11-11 cutting shown in FIG. 10 and 11 are substantially the same as FIGS. 6 and 7, except that the back surface 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 recesses. As shown in FIG. 10, each recess portion constituting the back surface side recess 45b is a grid 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 is formed in a grid surrounded by grooves 42 that intersect in a shape. With the configuration of the back surface side recess 45b, the movement of the liquid into the back surface side recess 45b is promoted by the capillary phenomenon, and the liquid can be held in the back surface side recess 45b.

As described above, according to the absorbent article 10D of the fourth embodiment, the liquid absorption performance and the holding performance are improved by the back surface side recesses 45, 45a and 45b formed on the back sheet 30 side surface of the absorber 40D. Can be enhanced. In addition, according to the absorbent article 10D of the fourth embodiment, various effects similar to those described in the first embodiment can be exhibited.

E. Modification example:
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 each of the above embodiments are referred to as "absorbent articles 10" without distinction. Similarly, the absorbers 40, 40B, 40D, 40Da, and 40Db are also referred to as "absorbent 40" without distinction, and the diffusion layers 50 and 50C are also referred to as "diffusion layer 50" without distinction. ..

E1. Modification 1:
In each of the above-described embodiments, a plurality of parallel linear groove portions 42 intersecting in a substantially lattice pattern are formed in each absorber 40, but the configuration of the groove portions 42 is the same as that of each of the above-described embodiments. There is no limitation. The groove portion 42 may not be formed in a straight line, and may be formed in a curved shape, for example. Further, the width of the groove portion 42 does not have to be constant and may change for each portion. The grooves 42 may not intersect in a grid pattern, for example, may intersect in a mesh pattern, or all the grooves 42 may intersect at one point and extend radially. Further, the groove portions 42 may be formed so as not to intersect with each other. For example, all the groove portions 42 may extend in parallel with each other, or all the groove portions 42 extend radially without intersecting with each other. May be good. The depths of the plurality of groove portions 42 may be different from each other, or the depths may be changed 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 thereof, and has a portion at the lower side where the density is locally increased. On the other hand, the groove portion 42 may not be formed by compressing the absorber 40 in the thickness direction, and may not have a portion where the density is locally increased. The groove portion 42 may be formed by reducing the amount of the constituent material in the absorber 40 as compared with other portions. Even with such a configuration, the liquid that has permeated the lower portion of the groove portion 42 can be diffused to a portion other than the lower portion of the groove portion 42 by the diffusion layer 50.

E2. Modification 2:
In each of the above embodiments, the diffusion layer 50 is partially adhered to the core wrap sheet 41 of the absorber 40. On the other hand, the diffusion layer 50 may be arranged in a state where the entire diffusion layer 50 is not adhered to the core wrap sheet 41, that is, in a state where the diffusion layer 50 is not constrained to the absorber 40. This makes it possible to form the diffusion layer 50 more easily.

E3. Modification 3:
In each of the above embodiments, the absorber 40 is wrapped in a core wrap sheet 41. On the other hand, the absorber 40 does not have 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 arranged so as to be in direct contact with the absorber 40.

E4. Modification 4:
In each of the above embodiments, the core wrap sheet 41 is composed of a single sheet-like member. On the other hand, the core wrap sheet 41 may be formed 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 forming the lower layer presses 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 a diffusion layer 50.

E5. Modification 5:
In the absorbent article 10 of each of the above embodiments, a surface groove portion 22 is formed in which a part of the top sheet 20 is inserted into the groove portion 42. On the other hand, the absorbent article 10 may not have the surface groove portion 22 formed. Such a configuration can be realized by a step of forming the groove portion 42 in the absorber 40 and then laminating the top sheet 20 on the absorber 40.

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

E7. Modification 7:
In the third embodiment, the diffusion layer 50C has a concavo-convex structure in which the diffusion layer 50C has a corrugated plate shape, so that 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. Is formed. On the other hand, 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. Further, the diffusion layer recess 51 may be formed by locally thinning the diffusion layer 50C by cutting or melting. Further, in the third embodiment described above, a diffusion layer recess 52 recessed on the side opposite to the diffusion layer recess 51 is formed on the surface of the diffusion layer 50C on the back sheet 30 side. In the diffusion layer 50C, the diffusion layer recess 51 on the absorber 40 side may be omitted, and only the diffusion layer recess 52 on the back sheet 30 side may be formed.

E8. Modification 8:
In the fourth embodiment, the configurations of the three types of recesses 45, 45a, and 45b on the back surface side are described. On the other hand, a recess on the back surface side having another configuration may be formed on the surface of the absorber 40 on the diffusion layer 50 side. For example, the back surface side recess may be formed as a groove portion having various configurations as described as a modification of the groove portion 42 in the above-mentioned modification 2. The back surface side recess may be formed as a recess having a substantially quadrangular opening shape or a recess having another polygonal opening shape.

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

The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations within a range not deviating from the gist thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the column of the outline of the invention may be used to solve some or all of the above-mentioned problems. , It is possible to replace or combine as appropriate in order to achieve a part or all of the above-mentioned effects. 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 30 ... Back sheet 40, 40B, 40D, 40Da, 40Db ... Absorber 41 ... Core wrap sheet 42 ... Groove portion 43 ... Groove bottom portion 45, 45a, 45b ... Back surface side recess 46 ... Compression portion 50, 50C ... Diffusion layer recess 60 ... Diffusion layer recess 60 ... Cover sheet 61 ... Constricted portion 62 ... Elastic member 63 ... Fixing tape 64 ... Fixing part 65 ... Elastic member 70 ... Side sheets 71, 72 ... Ends 73 ... Elastic member

Claims (5)

An absorbent article that absorbs and retains liquids
A first sheet having hydrophilicity and allowing the liquid to permeate in the thickness direction,
A second sheet that is impermeable to liquid and
An absorber that is sandwiched between the first sheet and the second sheet and absorbs and holds the liquid that has passed through the first sheet inside.
With
A groove is provided on the surface of the absorber on the first sheet side.
A diffusion layer that has hydrophilicity between the second sheet and the absorber and diffuses the liquid that has permeated to the second sheet side via the absorber is formed from the absorber to the diffusion layer. It is provided at a position where it overlaps with the groove when viewed in the direction toward
The base material constituting the diffusion layer is arranged so as not to cover the surface of the absorber on the first sheet side.
A core wrap sheet, which is a single member that encloses the entire absorber, is further provided.
The diffusion layer is partially adhered to the core wrap sheet .
The diffusion layer is an absorbent article made of a member having a higher hydrophilicity than the core wrap sheet. The absorbent article according to claim 1.
The absorber contains an absorbent resin which is a resin material having a property of absorbing and retaining the liquid.
An absorbent article in which the weight of the absorbent resin contained in the absorbent body 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 absorber on the second sheet side, a recess on the back surface side, which is a recess formed by compressing the absorber, is formed when viewed in the direction from the absorber toward the diffusion layer. An absorbent article provided in an area that overlaps with. The absorbent article according to any one of claims 1 to 3.
The diffusion layer is an absorbent article having a diffusion layer recess recessed in the thickness direction. The absorbent article according to any one of claims 1 to 4.
An absorbent article in which the diffusion layer is made of a member whose hydrophilicity is less likely to decrease when the liquid is repeatedly absorbed than the member constituting the first sheet.

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