JP2015027342A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article excellent in preventing extrusion and leakage of excrement such as urine.SOLUTION: An absorbent article 1 comprises: a liquid permeable top sheet 11; a liquid impermeable back sheet 12; and an absorber 13 arranged between the top sheet 11 and the back sheet 12 and containing highly absorbent resin 15. The absorber has high density layers 16, made of the highly absorbent resin 15, at both edges in the longitudinal direction and/or lateral direction of the absorber 13. The high density layer 16 includes a highly absorbent resin 15 and hot melt adhesive and is compressed.

Description

  The present invention relates to an absorbent article that is excellent in preventing bleeding and leakage of excrement such as urine.

  In general, absorbent articles such as disposable diapers and sanitary napkins include a fluff pulp, a super absorbent polymer (hereinafter referred to as “SAP”) between a liquid-permeable top sheet and a liquid-impermeable back sheet. ”), And has a structure including an absorbent body made of a hydrophilic sheet or the like. Excrements such as urine and blood are absorbed by the absorber via the top sheet that comes into contact with the skin, and the back sheet placed on the back surface of the absorber prevents the excrement from leaking to the outside such as clothing. .

  In such an absorbent article, the excrement has reached the ends of the absorbent body in the front-rear and left-right direction (here, front-rear and left-right directions refer to the front-rear direction and the left-right direction when the absorbent article is attached to the wearer) In some cases, the excrement that could not be absorbed began to ooze out of the absorbent body and flow backward from the top sheet to cause leakage.

  In order to prevent bleeding and leakage of excrement, for example, a disposable diaper has been proposed in which a pair of three-dimensional gathers that contract in the longitudinal direction of the absorbent body are provided, and an auxiliary absorbent body is disposed in the three-dimensional gather (Patent Document). 1).

JP 2004-081575 A

  However, since the three-dimensional gather used for such an absorbent article is folded and stored, the absorbent article is attached to the wearer in a state where the three-dimensional gather is not completely spread, and the three-dimensional gather is prevented from leaking. There was a problem that the function did not work properly. In addition, the auxiliary absorber disposed in the three-dimensional gather has no effect in the front-rear direction even though it is effective for preventing leakage of excrement in the left-right direction.

  This invention is made | formed in view of this point, and it aims at providing the absorbent article excellent in the exudation of excrement, such as urine, and leakage prevention.

In order to achieve such an object, the present invention is grasped by the following configuration.
(1) The absorbent article of the present invention is an absorbent article, and is disposed between a liquid-permeable top sheet, a liquid-impermeable back sheet, and the top sheet and the back sheet. An absorbent body containing an absorbent resin, wherein the absorbent body has a high-density layer of the superabsorbent resin along each of both end portions in the longitudinal direction and / or the lateral direction. .

  According to this configuration, it is possible to provide an absorbent article that is excellent in preventing bleeding of urine and other excrement and preventing leakage, as compared with the case where this configuration is not provided.

(2) In the absorbent article of the present invention, in the configuration of (1), the high-density layer is 120% or more and 300% or less with respect to other regions in the basis weight of the high-absorbency resin. Features.

  According to this configuration, it is possible to provide an absorbent article having a good balance between the liquid diffusibility and the absorption speed of the absorbent body and its high blending region.

(3) In the absorbent article of the present invention, in the configuration of either (1) or (2), the high-density layer includes the superabsorbent resin and a hot melt adhesive, and is consolidated. It is characterized by being.

  According to this configuration, it is possible to suppress the dropping of the superabsorbent resin in the high blending region.

(4) The absorbent article of the present invention is characterized in that, in the configuration of (3), the high-density layer is 80% or more and 97% or less with respect to the central portion of the absorber in thickness. .

  According to this structure, the mounting | wearing fall at the time of the superabsorbent resin which absorbed the excretion swelled can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the absorbent article excellent in the exudation of excrement, such as urine, and leak prevention.

It is a schematic structure figure showing an absorptive article concerning this invention. It is a schematic block diagram of the absorber which concerns on this invention. It is XX sectional drawing in the absorbent article shown in FIG.

(Embodiment)
In order to solve the above problems, a preferred embodiment (hereinafter referred to as “embodiment”) of the absorbent article of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the embodiments, the same numbers are assigned to the same elements throughout. Moreover, among the terms of the present invention, the “longitudinal direction” means the up and down direction in FIG. 1, and the “short side direction” means the left and right direction.

  As shown in FIG. 1 thru | or FIG. 3, the absorbent article 1 becomes a structure which contains the liquid-permeable top sheet 11, the absorber 13, and the liquid-impermeable back sheet 12 in an order from the side which contacts skin. Yes. The top sheet 11 and the back sheet 12 are laminated such that the absorber 13 is sandwiched between the top and bottom, and the periphery thereof is partially or entirely fixed by a hot melt adhesive (not shown).

  Although there is no restriction | limiting in particular as the absorbent article 1 of this invention, For example, a disposable paper diaper, a sanitary napkin, a panty liner, a light incontinence pad, a liner etc. can be mention | raise | lifted.

The top sheet 11 of the present embodiment only needs to have liquid permeability so that excrement such as urine can penetrate into the absorbent body 13. For example, a nonwoven fabric such as a thermal bond nonwoven fabric and a thermal bond / spun bond are laminated. It is formed using a material such as a composite nonwoven fabric, a foamed film such as an open polyethylene film, a polyethylene foam, a urethane foam, or a composite sheet obtained by laminating these. In order to reduce irritation to the skin, it is also preferable that the top sheet 11 contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, in terms of strength and workability, the basis weight of the top sheet 11 is preferably 10 g / m ² or more and 50 g / m ² or less, more preferably 15 g / m ² or more and 30 g / m ² or less.

The back sheet 12 of the present embodiment may have any liquid impermeability so that excrement such as urine held by the absorbent body 13 does not ooze out or leak into the underwear, such as a nonwoven fabric, a resin film, Alternatively, a material such as a composite sheet obtained by laminating these materials is used as a base material. Such a nonwoven fabric is not particularly limited in its production method, and examples thereof include spunbond and meltblown nonwoven fabrics, or composite nonwoven fabrics in which spunbond / meltblown, spunbond / meltblown / spunbond are laminated, and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. From the viewpoint of strength and workability, the basis weight of the back sheet 12 is preferably 15 g / m ² or more and 40 g / m ² or less. Further, it is preferable that the back sheet 12 has moisture permeability in order to prevent stuffiness at the time of wearing. In order to provide moisture permeability, for example, a filler is blended in the resin film of the base material, and the back sheet 12 is embossed. An example of the filler is calcium carbonate, and the processing method thereof can be a known method without limitation.

  As shown in FIGS. 2 and 3, the absorbent body 13 of the present embodiment is made of a base material 14 and a superabsorbent resin (SAP) 15, and both ends of the absorbent body 13 in the longitudinal direction and / or the width direction. In the part, a high-density layer 16 of SAP 15 is formed so as to surround the periphery of the absorber 13.

  The substrate 14 is not particularly limited as long as it has liquid absorbency, liquid conductivity, and adhesion to the SAP 15, and examples thereof include fluff pulp and hydrophilic sheets. Examples of such fluff pulp include those obtained by defibrating wood pulp and synthetic fibers into cotton, and examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven fabric.

  SAP15 is generally known as an absorbent material for absorbent articles such as disposable paper diapers, sanitary napkins, urine pads, etc., and has a water absorption capacity of 0.9% sanitary saline and has a hydrophilicity of several tens of times its own weight. The resin is not particularly limited, and examples thereof include sodium polyacrylate, starch graft polymer, carboxymethyl cellulose, and polyvinyl alcohol. From the viewpoint of absorption performance such as absorption rate and water retention, sodium polyacrylate is preferred. The SAP 15 includes “powder” and “fiber” in addition to “particles” normally used in absorbent articles.

  The absorber 13 is comprised by the sheet | seat form of single layer or multiple layers using said material. The absorbent body 13 does not necessarily need to be formed including SAP 15 in other regions other than the high-density layer 16, but from the viewpoint of securing the amount of absorption, a hydrophilic fiber matrix of a fluff pulp web such as a wood fluff pulp Is preferably formed by mixing SAP 15 with SAP 15 or a SAP sheet in which SAP 15 is coated on a hydrophilic sheet and a high-density layer 16 of SAP 15 is formed.

  The shape of the absorbent body 13 is not particularly limited as long as it is generally used for absorbent articles such as disposable diapers, sanitary napkins, and urine pads. For example, a rectangular shape, an hourglass shape, an I-shape, etc. I can give you.

  The high density layer 16 scatters the SAP 15 in a strip shape along both ends of the absorbent body 13 in the longitudinal direction and / or the lateral direction, and the SAP 15 dispersed on the absorbent body 13 is absorbed by the hot melt adhesive. 13 is formed by bonding. As a result, when the excrement such as urine reaches the both ends of the absorbent body 13 in the longitudinal direction and / or the lateral direction, the SAP 15 of the high-density layer 16 absorbs the excrement and swells and gels, thereby blocking the excrement. From the both ends of the absorbent body 13 in the longitudinal direction and / or the lateral direction, it is possible to prevent bleeding and leakage of the excrement. The high-density layer 16 is preferably formed on the upper surface (top sheet side) of the absorber 13 from the viewpoint of productivity.

  The hot melt adhesive is not particularly limited as long as it is generally used in absorbent articles. For example, SIS (styrene / isoprene / styrene block copolymer) -based hot melt adhesive, SBS (styrene / butadiene) / Styrene block copolymer) hot melt adhesive, SEBS (styrene / ethylene / butylene / styrene block copolymer) hot melt adhesive, and the like. In addition, the amount of hot melt adhesive applied can be appropriately set according to the type of hot melt adhesive used and the basis weight of SAP 15 as long as it does not impair the absorbability.

  The high-density layer 16A at both ends in the longitudinal direction has a width of 3% or more and 10% or less with respect to the dimension in the short direction (width direction) of the absorber 13, and the length is the longitudinal direction (length direction) of the absorber. It is preferably 90% or more with respect to the dimension. The high-density layer 16B at both ends in the lateral direction has a width of 80% to 95% with respect to the longitudinal dimension of the absorber 13, and a length of 3 with respect to the lateral dimension of the absorber. % To 10% is preferable. The high-density layer 16A and the high-density layer 16B may be in contact with each other or have a gap.

  As a method for forming the high-density layer 16, (a) a hot melt adhesive is applied to one side of the absorbent body 13, and the SAP 15 is intermittently dispersed and adhered. (B) the SAP 15 is intermittently dispersed on one side of the absorbent body 13, (C) Apply hot melt adhesive on one side of the absorber 13, spray SAP 15 intermittently, and apply hot melt adhesive on it to adhere There are methods. From the viewpoint of preventing desorption of the SAP 15 from the absorber 13, the method (c) is preferable.

  As a method for applying the hot melt adhesive, a method in which the head is applied in contact with the absorber 13, a curtain coating method or a spiral method in which the hot melt adhesive in a molten state is discharged from a nozzle in a thread form and applied in a non-contact manner. Can give. Among them, the curtain coating method and the spiral method are preferable from the viewpoint that they can be applied in a non-contact manner and do not inhibit the water absorption of the absorber.

Further, the SAP 15 that has absorbed the excrement swells and increases in volume and thickness in the high-density layer 16, thereby causing a decrease in the wearability of the absorbent article 1. From the viewpoint of preventing this wearability deterioration, it is preferable to reduce the thickness by densifying the high-density layer 16. The consolidation treatment can be performed by pressing the high-density layer 16 with a hot embossing machine or a roll press machine, for example. The pressure during the consolidation process may be within a range where the SAP 15 is not damaged. When the SAP 15 is broken, the particle pieces are peeled off from the absorber 13 and the absorbent capacity of the absorbent article 1 is reduced. Dense layer 16 has a thickness _{T 1} is, is 80% or more 97% or less of the thickness _{T 0} of the absorbent central portion. Moreover, 90% or more and 97% or less are more preferable.

In light of the balance between the absorption rate of the base material 14 and the SAP 15, water retention, and liquid returnability, the basis weight of the SAP 15 in the absorbent body 13 is preferably 150 g / m ² or more and 300 g / m ² or less. In addition, the basis weight of the SAP 15 in the high-density layer 16 is 120% or more with respect to other regions of the absorber 13 from the viewpoint of the balance between the absorption speed and the liquid diffusibility between the absorber 13 and the high-density layer 16. It is set as the structure which is 300% or less, More preferably, it is 150 to 250%, More preferably, it is 150 to 200%. The basis weight of the SAP 15 between the high-density layer 16A at both ends in the longitudinal direction and the high-density layer 16B at both ends in the short direction may be the same or different.

  The absorbent body 13 is preferably formed with a compressed groove (not shown) extending in the longitudinal direction along the longitudinal center of the absorbent body 13. By this compressed groove, the absorbent article 1 can be easily bent in the longitudinal direction, and a local fit feeling can be improved during wearing. Further, it is preferable to emboss the surface of the absorbent body 13 to control the diffusion of excrement such as urine and to easily deform the absorbent body 13 according to the body shape of the user.

  In order to prevent leakage of the SAP 15 and stabilize the shape of the absorber 13, it is preferable to wrap the absorber 13 in a hydrophilic carrier sheet 17 such as tissue. For example, as shown in FIG. 3, the carrier sheet 17 is wrapped in the lower surface (back sheet side) and the front and rear side surfaces (back side and abdomen side) along the longitudinal direction of the absorber 13. Then, the two end surfaces are overlapped on the upper surface (top sheet side) and bonded with a hot melt adhesive (not shown), but this is not restrictive.

In order to promote diffusion of excrement such as urine to the upper surface of the absorbent body 13, a liquid diffusable sheet 18 can be provided between the top sheet 11 and the absorbent body 13. Examples of the liquid diffusive sheet 18 include an air-through nonwoven fabric, a point bond nonwoven fabric, and a spunbond nonwoven fabric. The thickness of the liquid diffusion sheet 18 is preferably 0.1 mm or more, and the basis weight is preferably 15 g / m ² or more. If the thickness is less than 0.1 mm or the basis weight is less than 15 g / m ² , the liquid is not sufficiently diffused over the entire upper surface of the absorber 13, which is not preferable. Further, the shape of the liquid diffusive sheet 18 is not particularly limited, but is a shape that can completely cover the surface of the absorbent body 13 so that liquid such as urine can diffuse throughout the absorbent body 13. Is preferred.

  Furthermore, in order to prevent the side leakage of the excrement, a three-dimensional gather 19 made of an elastic elastic member such as a water-repellent nonwoven fabric and thread rubber can be provided on both side edges in the longitudinal direction of the absorbent article 1.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. Further, it is apparent from the description of the scope of claims that the embodiment added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Absorbent article 11 Top sheet 12 Back sheet 13 Absorbent body T ₀ Thickness of absorber center T ₁ Thickness of SAP high blending region 14 Base material 15 Super absorbent resin (SAP)
16 High-density layer 16A High-density layer 16B at both ends in the longitudinal direction High-density layer 17 at both ends in the short-side direction 17 Carrier sheet 18 Liquid diffusible sheet 19 Solid gather

Claims (4)

An absorbent article,
A liquid-permeable topsheet;
A liquid-impermeable backsheet;
Arranged between the top sheet and the back sheet, and comprising an absorbent containing a superabsorbent resin,
The absorbent article has a high-density layer of the superabsorbent resin along each of both end portions in the longitudinal direction and / or the lateral direction. The absorbent article according to claim 1, wherein the high-density layer is 120% or more and 300% or less with respect to other regions in the basis weight of the superabsorbent resin. The absorbent article according to any one of claims 1 and 2, wherein the high-density layer is a consolidated layer including the superabsorbent resin and a hot-melt adhesive. The absorbent article according to claim 3, wherein the high-density layer has a thickness of 80% or more and 97% or less with respect to a central portion of the absorber.

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