JP2016052399A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve permeability of urine of a surface sheet inside a recessed groove, and to prevent the surface sheet from being torn during the wearing.SOLUTION: An incontinence pad 1 has an absorber 4 interposed between a liquid-permeable surface sheet 3 and a rear surface sheet 2 and a recessed groove 22 formed in a longitudinal direction on a skin side by embossing from a surface side of the liquid-permeable surface sheet 3 with the liquid-permeable surface sheet 3 laminated on the absorber 4. The liquid-permeable surface sheet 3 is constituted of a non-woven fabric having a plurality of opening holes 23, 23... of a long planar shape in the longitudinal direction of the incontinence pad 1, and at least the opening holes 23, 23... provided in an area where the recessed groove 22 is formed are opened to expand in a width direction of the incontinence pad 1 while the recessed groove 22 is formed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an absorbent article mainly used for incontinence pads, disposable diapers, and the like, and more particularly to an absorbent article having a groove formed along the longitudinal direction on the skin side.

  Conventionally, as the absorbent article, an absorbent body is interposed between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. It has been known.

  Numerous improvements have been made to this type of absorbent article, especially as a means of temporary storage and urine diffusion to catch urine that is dripped out at once, such as an incontinence pad, in a small area and quickly diffuse it. Various types of grooves having grooves along the longitudinal direction on the skin side have been proposed (for example, Patent Documents 1 and 2 below).

  In the following Patent Document 1, an upper absorbent layer and a lower absorbent layer having different areas are laminated, a step is formed in the absorbent layer, and the longitudinal direction of the absorbent article is integrated with the topsheet and the absorbent layer. Is formed at the center of the absorbent article across the high and low portions of the step, and the recess is formed at the step of the absorbent layer. An absorbent article that is continuously formed without interruption is disclosed.

  Moreover, in the following Patent Document 2, the upper layer absorbent body on the skin contact surface side and the lower layer absorbent body on the non-skin contact surface side have a middle and high portion formed by the upper layer absorbent body and the lower layer absorbent body. A recess formed in the contact surface side extending in the longitudinal direction, the recess being an opening penetrating the upper-layer absorber, and the lower-layer absorption on the lower surface of the upper-layer absorber so as to form a bottom surface of the opening An absorbent article in which the body is located is disclosed.

Japanese Patent No. 5105884 JP 2009-112590 A

  In the absorbent article described in Patent Literatures 1 and 2, the concave groove is formed by embossing from the surface side of the liquid-permeable surface sheet in a state where the liquid-permeable surface sheet is laminated on the surface side of the absorber. It is formed by squeezing the liquid surface sheet and the absorbent body integrally or by squeezing the liquid permeable surface sheet against the absorbent body provided with a recess or slit in advance. Accordingly, since the surface sheet is stretched by the depth of the groove by embossing, strictly speaking, the inter-fiber distance α of the groove portion and the inter-fiber distance β other than the groove have a relationship of α> β. . For this reason, it is considered that urine temporarily stored in the groove is likely to pass through the surface sheet with the increased interfiber distance and easily transferred to the absorber.

  However, when a non-porous nonwoven fabric is used as the top sheet, the distance between fibers stretched when embossing for forming the concave grooves is very small, and the effect of improving liquid permeability is extremely high. Low. For this reason, the urine temporarily stored in the concave groove overflows to the surface without being absorbed by the absorber and remains on the surface, which may cause a sticky feeling.

  On the other hand, when embossing for forming a concave groove is performed, the surface sheet is stretched, so that the strength of the stretched portion of the surface sheet is reduced, and the problem arises that it is easily broken during mounting.

  In addition, if the topsheet is pulled when embossing to form a ditch, the absorber around the ditch is crushed by the topsheet, so the urine can be smoothly transferred from the ditch to the absorber. There was a problem that the permeability of urine was lowered.

  Therefore, the main problem of the present invention is to improve the urine permeability of the surface sheet in the recessed groove in the absorbent article in which the groove is formed along the longitudinal direction on the skin side, and the surface sheet being worn It is providing the absorbent article which prevented tearing.

In order to solve the above-described problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and the liquid-permeable surface sheet is laminated on the absorber. In the absorbent article in which a groove is formed along the longitudinal direction on the skin side by embossing from the surface side of the liquid-permeable surface sheet,
The liquid-permeable surface sheet is composed of a nonwoven fabric provided with a large number of apertures having a long planar shape in the longitudinal direction of the absorbent article, and is formed with at least the concave groove forming region. The absorbent article is characterized in that the apertures provided in are expanded in the width direction of the absorbent article.

  In the first aspect of the present invention, in the state where the liquid-permeable surface sheet is laminated on the absorber, embossing is performed from the surface side of the liquid-permeable surface sheet, thereby forming a groove along the longitudinal direction on the skin side. Is forming. At this time, as the liquid-permeable surface sheet, since a non-woven fabric having a large number of apertures having a long planar shape in the longitudinal direction of the absorbent article is used, at least the concave grooves are formed in the state where the concave grooves are formed. The opening provided in the formation region is expanded in the width direction of the absorbent article. For this reason, the urine temporarily stored in the ditch is easy to permeate the liquid-permeable surface sheet through the expanded hole, and can be quickly transferred to the absorber. Therefore, the urine in the ditch is prevented from overflowing to the surface, so that the urine does not remain on the surface and a smooth feeling continues.

  In addition, by embossing to form a concave groove, the liquid-permeable surface sheet is excessively pulled to reduce the strength of the liquid-permeable surface sheet, and the liquid-permeable surface sheet can be prevented from being torn, Since it can avoid that an absorber is crushed by the pulled liquid-permeable surface sheet, it can prevent that the absorption performance of an absorber falls.

  As the present invention according to claim 2, the liquid permeable surface sheet has a convex portion having a relatively high basis weight and a concave portion having a relatively low basis weight respectively extending in the longitudinal direction of the absorbent article. The absorbent article according to claim 1, wherein the absorbent article is alternately and repeatedly formed in the width direction, and the opening is provided in the recess.

  In the invention according to claim 2, as the liquid-permeable surface sheet, a convex portion having a relatively high basis weight and a concave portion having a relatively low basis weight than the convex portion respectively extend in the longitudinal direction of the absorbent article. In addition, since the absorbent article is alternately and repeatedly formed in the width direction and the recess is provided with the opening, it is relatively low when embossing for forming the recess is performed. Tensile stress tends to concentrate on the concave portion of the basis weight, and the concave portion is stretched in the width direction, so that the opening tends to expand more greatly.

As this invention which concerns on Claim 3, the said absorber follows the longitudinal direction of an absorbent article on the surface at the side of the said liquid-permeable surface sheet, and it does not depend on pressing over the longitudinal direction range containing a urine discharge | emission part. Provided with a concave recess or slit-shaped absorber recess,
The groove is embossed along the absorber recess from the surface side of the liquid permeable surface sheet to the bottom surface of the absorber recess in a state where the liquid permeable surface sheet is laminated on the absorber. An absorbent article according to any one of claims 1 and 2 is provided.

  In the invention described in claim 3, the absorbent body is provided with a concave groove-shaped or slit-shaped absorbent concave portion on the liquid-permeable surface sheet side of the absorbent body at a position where the concave groove is to be formed without being compressed. Since the groove is formed by embossing the bottom of the absorber recess along the absorber recess, the recess is recessed compared to the case where the recess is formed by pressing the absorber integrally. The density of the absorber around the groove can be prevented from becoming extremely high, and the urine temporarily stored in the concave groove is easily transferred to the absorber.

  As the present invention according to claim 4, there is provided the absorbent article according to claim 3, wherein the emboss is provided with an emboss width smaller than a groove width of the absorber recess.

  In the invention according to the fourth aspect, since the emboss when forming the concave groove is provided with an emboss width smaller than the groove width of the absorber concave portion, the liquid-permeable surface sheet and the absorber are provided in the concave groove. A predetermined space (buffer zone) is formed between the side surface and the opening, and the opening is expanded without resistance, so that the absorption efficiency of urine can be improved.

  As described above, according to the present invention, the urine permeability of the liquid-permeable surface sheet can be improved in the concave groove, and the tearing of the surface sheet during mounting can be prevented.

It is a partially broken developed view of the incontinence pad 1 according to the present invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. FIG. 4 is a cross-sectional view of the absorber 4. FIG. 5 is a cross-sectional view showing a processing procedure for a concave groove 22. (A) is a plan view of the liquid-permeable surface sheet 3 before processing the groove 22 and (B) is after processing the groove 22. It is an expanded sectional view of the ditch | groove 22 which shows the transfer path | route of urine. The liquid-permeable surface sheet 3 which concerns on another form example is shown, (A) is sectional drawing, (B) is a top view. (A)-(C) are the expanded views of the incontinence pad 1 which shows the other Example of the groove 22. (A)-(C) are the expanded views of the incontinence pad 1 which shows the other Example of the groove 22. (A)-(F) are the expanded views of the incontinence pad 1 which shows the other Example of the groove 22. It is a principal part expanded sectional view of the incontinence pad 1 which shows the other Example of the absorber recessed part 20. FIG. It is an expanded sectional view of the ditch | groove 22 which shows another example of a form. (A) is a cross-sectional view showing a urine permeation state, and (B) is a cross-sectional view showing an expanded state during liquid absorption. It is an expanded view at the time of employ | adopting the concave groove 22 for 1 A of disposable diapers.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic configuration of incontinence pad 1]
As shown in FIGS. 1 to 3, the incontinence pad 1 according to the present invention includes a liquid-impermeable back sheet 2 made of a polyethylene sheet and the like, a liquid-permeable surface sheet 3 that quickly transmits urine, and the like. Absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between both sheets 2 and 3, and crepe paper or non-woven fabric surrounding the absorbent body in order to maintain the shape and improve the diffusibility of the absorbent body 4 And the like, and a substantially side edge portion of the absorbent body 4 as an upright base end, and provided at least in a predetermined section in the longitudinal direction so as to include the urine discharge site H. It is mainly composed of a pair of left and right three-dimensional gathers BS, side nonwoven fabrics 7 and 7 forming the BS, and around the absorbent body 4, the liquid-impervious back sheet 2 and the transparent material are disposed at the longitudinal edges. Liquid surface sheet 3 and The liquid-impervious back sheet 2 and the side nonwoven fabric whose outer edge portions are bonded by an adhesive such as hot melt or an adhesive means such as heat seal, and whose both side edge portions extend laterally from the absorbent body 4. 7 is bonded by an adhesive such as hot melt or an adhesive means such as heat sealing. In addition, a hydrophilic second sheet can be arrange | positioned between the said liquid-permeable surface sheet 3 and the absorber 4 as needed.

Hereinafter, the structure of the incontinence pad 1 will be described in detail.
The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  The liquid-permeable surface sheet 3 is preferably a non-woven fabric having openings having a predetermined shape. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulkiness and high compression recovery. The liquid-permeable surface sheet 3 will be described in more detail later.

  The absorbent body 4 is composed of absorbent fibers such as cotton-like pulp and a highly water-absorbing polymer 8, and in the illustrated example, the planar shape is an oblong shape that is long in the longitudinal direction of the pad. The superabsorbent polymer 8 is, for example, granular powder, and is dispersed and mixed in the pulp constituting the absorber 4.

Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. In this incontinence pad 1, since the absorbent body 4 is surrounded by the encapsulating sheet 5, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The excellent encapsulating sheet 5 diffuses urine quickly and prevents the urine from returning. Basis weight of the ^{pulp, 100g / m 2 ~600g / m} 2, and it is preferably a ^{200g / m 2 ~500g / m 2} .

  Examples of the superabsorbent polymer 8 include a cross-linked polyacrylate, a self-crosslinked polyacrylate, a saponified acrylate-vinyl acetate copolymer cross-linked product, and a cross-linked isobutylene / maleic anhydride copolymer. , A crosslinked polysulfonate, and a partially crosslinked water-swellable polymer such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water-absorbing performance can be adjusted in absorption capacity (water-absorbing power) and absorption rate by adjusting the crosslinking density and the crosslinking density gradient.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilizing agent so as to have affinity for urine.

  The encapsulating sheet 5 can be a paper material such as tissue or a liquid-permeable sheet such as a nonwoven fabric. In particular, it is preferable to use a nonwoven fabric that does not easily cause destruction (breaking) of materials. As such a nonwoven fabric, a nonwoven fabric processed by a spunbond method and an SMS method excellent in balance between thinness and strength, and an elastic fiber made of a thermoplastic elastomer resin are directly connected to a spinning process such as a spunbond method or a melt blow method. Nonwoven fabrics mainly made of stretchable materials such as nonwoven fabrics, latex, urethane and olefinic fibers processed by the method of forming a web are suitable. In the encapsulating sheet 5, the hydrophilicity of the sheet is not particularly limited as long as at least the skin contact surface side (surface side) of the absorbent body 4 is not water-repellent.

  Side nonwoven fabrics 7 and 7 are provided on both sides of the surface of the incontinence pad 1 along the longitudinal direction and over the entire length of the incontinence pad 1, and the outer portions of the side nonwoven fabrics 7 and 7 extend laterally. The liquid-impermeable back sheet 2 is laterally extended, and the side nonwoven fabric 7 portion and the liquid-impermeable back sheet 2 portion that are extended to the side are formed by a hot melt adhesive or the like. Joined to form side flaps.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing the penetration of urine, etc. or enhancing the feeling of touch, such as SSMS, SMS, and SMMS coated with a silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric, and if emphasis is placed on urine absorbability, a method of polymerizing a compound having a hydrophilic group, such as an oxidation product of polyethylene glycol, in the synthetic fiber production process, Treating with metal salt such as stannic, partially dissolving the surface to make it porous and making the synthetic fiber swell or porous by applying a metal hydroxide, etc., applying capillary action to impart hydrophilicity It is desirable to use a hydrophilic treated nonwoven fabric. As this side nonwoven fabric 7, what was formed by a proper processing method using natural fiber, synthetic fiber, regenerated fiber, etc. as a raw material can be used.

  The side nonwoven fabrics 7 and 7 are appropriately folded, and a pair of left and right inner solid gathers 10 and 10 that stand on the skin side with the position near the side edge of the absorbent body 4 as a standing base end, and the inner side relatively A pair of left and right outer three-dimensional gathers 11 standing on the skin side formed by the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that are located outside the three-dimensional gather 10 and extend laterally from the absorbent body 4, 11 is a three-dimensional gather BS having a double gather structure. Note that the three-dimensional gather BS may have a single gather structure including only the inner three-dimensional gather 10 or the outer three-dimensional gather 11, or a three-dimensional gather standing up on the skin side simply by disposing the side nonwoven fabric 7. It does not have to be formed into a shape.

  The structure of the inner three-dimensional gather 10 and the outer three-dimensional gather 11 will be described in more detail. As shown in FIG. 2, the side nonwoven fabric 7 is folded back on both sides in the width direction toward the back side of the pad. In the illustrated example, one or a plurality of double sheet portions 7a and 7b are formed on the outer side, and both ends or appropriate positions in the longitudinal direction are fixed inside the double sheet portion 7a on the inner side in the width direction. One or a plurality of thread elastic elastic members 12 are arranged in the double sheet portion 7b on the outer side in the width direction, and two appropriate positions in the longitudinal direction are fixed. Of the liquid-permeable surface sheet 3, in which the base end portion of the double sheet portion 7 a on the inner side in the width direction is disposed on the side portion of the absorbent body 4. While being bonded by a hot-melt adhesive or the like, the base end portion of the double sheet portion 7b on the outer side in the width direction is hot on the side end portion of the liquid-impermeable back sheet 2 that extends to the side of the absorbent body 4. By being bonded by a melt adhesive or the like, the inner solid gathers 10 are formed on the skin side by the double sheet portion 7a on the inner side in the width direction, and the skin side is formed by the double sheet portion 7b on the outer side in the width direction. An outer three-dimensional gather 11 that stands up is formed. As shown in FIG. 3, the side nonwoven fabric 7 is not provided with the elastic elastic members 12 and 13 at both ends in the longitudinal direction of the pad, and the double sheet portion 7a on the inner side in the width direction is hot. It is joined to the absorber 4 side by a melt adhesive or the like.

[About the concave groove 22 and the liquid-permeable surface sheet 3]
In the incontinence pad 1, a concave groove 22 for inflow of urine is formed along the longitudinal direction on the skin side. The concave groove 22 receives urine discharged on the surface of the liquid-permeable surface sheet 3, temporarily stores urine, induces urine diffusion in the front-rear direction, and absorbs urine into the absorber 4. This is to increase the speed and prevent side leakage.

  Although the said groove 22 may be formed by pressing together the structural member from the liquid-permeable surface sheet 3 to the absorber 4 from the surface side of the liquid-permeable surface sheet 3, it is shown by FIG. Thus, the absorber recessed part 20 is formed in the said absorber 4 previously, and the structural member of the upper layer rather than the absorber 4 from the surface side (skin surface side) of the liquid-permeable surface sheet 3 along this absorber recessed part 20 is formed. Is formed by providing an embossed portion 21 that is pressed by the embossed convex portion 24 for the reason that deformation of the concave groove 22 due to leg pressure can be prevented.

  In the absorber 4, an absorbent recess 20 formed in a groove shape or a slit shape in the illustrated example without being pressed is formed in advance in a portion where the embossed portion 21 is to be formed. . For example, as shown in FIG. 4, the absorbent body recess 20 is formed by (A) stacking fiber, or (B) the lower layer absorbent body 4 a formed with the thickness of the bottom of the absorber recess 20, and A portion corresponding to the absorber recess 20 is formed by a laminated structure with the upper absorber 4b opened.

  As shown in FIG. 1, the absorbent recess 20 is formed only on the absorbent body 4 at the center in the pad width direction corresponding to the urine discharge site H and in the middle in the longitudinal direction. However, the incontinence pad 1 may be formed in a plurality of strips spaced apart in the width direction, or may be formed in various forms such as being formed in a discontinuous line shape spaced apart in the pad longitudinal direction (FIGS. 9 to 9). FIG. 11). In addition, when providing the several absorber recessed part 20, it is preferable to provide the said embossed part 21 with respect to each absorber recessed part 20. As shown in FIG.

  The planar dimensions of the absorber recess 20 are preferably such that the length in the pad longitudinal direction is 100 to 320 mm and the groove width (groove width on the bottom surface) is 5 to 45 mm. The depth of the absorber recess 20 is preferably 50% or more of the thickness of the absorber 4, specifically about 2 to 8 mm. This numerical range is set in consideration of not only the incontinence pad exemplified in this embodiment but also a case where a concave groove structure is adopted for the disposable diaper. In the case of a disposable diaper, it is formed with a size relatively larger than the incontinence pad.

The absorbent 4 portion interposed in the bottom of the absorbent recess 20 (the liquid-impermeable back sheet 2 side portion, the non-skin side portion) has a pulp basis weight of 0 g / m ^{2 to} 210 g / m ² , preferably preferably set to ^{70g / m 2 ~190g / m 2} . Also in this absorber portion, the water-absorbing polymer 8 is dispersed and mixed with a predetermined basis weight.

  Next, the liquid-permeable surface sheet 3 used in the incontinence pad 1 will be described in more detail. As shown in FIG. 6 (A), the liquid-permeable surface sheet 3 is composed of a nonwoven fabric having a large number of apertures 23, 23,. The said opening 23 is a part which penetrates from the one side surface of the liquid-permeable surface sheet 3 to the other side surface, and a nonwoven fabric fiber does not exist. The planar shape is preferably the oval shape shown in the drawing, and may be any shape as long as it is formed long in the pad longitudinal direction, such as an oval, a rectangle, a rhombus, or a polygon.

  In order to make a large number of openings 23, 23 ... in the liquid-permeable surface sheet 3, it is formed by perforation, formed by spraying fluid, formed by piercing a heated pin, etc. Known means can be employed. Alternatively, the perforation treatment may be performed using the perforated sheet manufacturing apparatus described in Japanese Patent Application Laid-Open No. 2008-18537.

  As the liquid-permeable surface sheet 3 having a large number of apertures 23, 23..., For example, JP 2011-135979 A, JP 2008-25083 A, JP 2009-185408 A, JP 2010-185 A, and the like. 84317, JP, 2014-68954, etc. can be used.

  A large number of the openings 23, 23... Are arranged at predetermined intervals in the pad width direction and the longitudinal direction over the entire surface of the liquid-permeable surface sheet 3. As shown in FIG. 6 (A), the openings 23 may be arranged in a lattice shape arranged in a straight line with respect to the pad width direction and the longitudinal direction, or arranged in every other row in the pad width direction. A staggered staggered pattern may be used.

  The size of the opening 23 is a natural state in which no stretching force is applied by the embossed portion 21, and the longitudinal dimension (dimension in the pad longitudinal direction) is 0.1 mm to 6.0 mm, preferably 0.5 mm to 3.0 mm. It is good to do. The opening 23 may be formed with a substantially constant size over the entire surface of the liquid-permeable surface sheet 3, or may be different in size only in the formation region of the concave groove 22. In the case of forming with different sizes, it is preferable that the size of the opening 23 arranged in the formation region of the concave groove 22 is larger than the size of the opening 23 arranged in another region.

  In the opening 23, the ratio of the dimension L in the longitudinal direction of the incontinence pad 1 to the dimension W in the width direction is L: W = 1.1: 1 to 10: 1, preferably 1.5: 1 to 5: 1, more preferably 2: 1 to 3: 1. When L: W is smaller than 1.1: 1, when a tensile force is applied in the pad width direction by the embossed portion 21, the opening 23 is elongated in the pad width direction, and urine transfer cannot be improved. . On the other hand, when L: W is larger than 10: 1, there is a possibility that problems such as turning over from the opening 23 may occur in a portion where the tensile force by the embossed portion 21 is not applied.

  Moreover, the center-to-center distance between the adjacent openings 23 and 23 is 0.5 mm to 30 mm, preferably 1.0 mm to 15 mm. The openings 23 may be arranged at almost constant intervals over the entire surface of the liquid-permeable surface sheet 3, or may be arranged at different intervals only in the formation regions of the concave grooves 22. When arranging only the formation region of the concave groove 22 at different intervals, it is preferable to make the interval smaller than other regions in order to improve urine migration in the concave groove 22 and to easily deform the liquid-permeable surface sheet 3. .

  As shown in FIG. 5, the liquid-permeable surface sheet 3 is formed with the concave grooves 22 formed by embossing from the surface side (skin surface side) of the liquid-permeable surface sheet 3. As shown in FIG. 5, at least the openings 23, 23... Provided in the formation region of the concave groove 22 are expanded in the pad width direction. That is, in the state where the liquid-permeable surface sheet 3 is laminated on the surface side of the absorbent body 4 on which the absorbent body recessed portion 20 is formed, the embossed convex portion 24 extends from the surface side of the liquid-permeable surface sheet 3 to the bottom surface of the absorbent body recessed portion 20. When the embossed portion 21 is applied, the liquid-permeable surface sheet 3 is stretched by an amount corresponding to the cross-sectional shape of the absorber concave portion 20, and the tensile force at this time is concentrated on the apertures 23, 23. The holes are expanded in the pad width direction.

  The range in which the openings 23, 23... Expand mainly corresponds to the both side surfaces and the bottom surface of the concave groove 22, but may extend to a range slightly outside the both side surfaces of the concave groove 22.

  The size of the opening 23 expanded by forming the concave groove 22 is about 1.3 to 4.2 times, preferably about 1.5 to 3.0 times in the pad width direction. Like that. The expansion ratio of the openings 23 in the pad width direction can be adjusted by the planar shape of the openings 23, the arrangement pitch in the pad width direction, and the like.

  Thus, in this incontinence pad 1, in the state which formed the ditch | groove 22 by giving the embossed part 21 from the surface side of the liquid-permeable surface sheet 3, the opening 23 provided in the formation area of the ditch | groove 22 at least , 23... Expand in the pad width direction, so that the urine temporarily stored in the groove 22 through the expanded openings 23, 23... Is easily transferred to the absorber 4 as shown in FIG. Become. In this way, urine in the groove is quickly transferred to the absorber 4 through the liquid-permeable surface sheet 3, so that urine in the groove is prevented from overflowing to the surface, and urine remains on the surface. The surface feels smoother. Moreover, since the tensile force applied to the liquid-permeable surface sheet 3 at the time of embossing is absorbed by deforming the openings 23, 23 ..., the liquid-permeable surface sheet 3 is not excessively pulled, The absorbent body 4 around the concave groove 22 is not compressed, and the urine absorbability and wearability of the absorbent body can be maintained.

  The liquid-permeable surface sheet 3 may be formed with a substantially constant thickness over the entire surface, and as shown in FIG. 8, a convex portion 3a having a relatively high basis weight, and this convex portion. The recesses 3b having a relatively low weight per unit area 3a may extend in the pad longitudinal direction and may be alternately and repeatedly formed in the pad width direction. In the case of the liquid-permeable surface sheet 3 composed of the convex portions 3a and the concave portions 3b, it is preferable to provide the openings 23, 23... At least only in the concave portions 3b. By providing the opening 23 in the recess 3b having a low basis weight, stress is concentrated in the recess 3b having a small resistance when the liquid-permeable surface sheet 3 is stretched during embossing, so that the opening 23 is provided in the recess 3b. The openings 23, 23... Can be expanded larger. In addition, you may provide an opening in the said convex part 3a. The convex portions 3a and the concave portions 3b are preferably approximately the same density, but may be formed with different densities.

  Examples of the liquid-permeable surface sheet 3 having the convex portions 3a and the concave portions 3b and having a large number of openings include, for example, JP 2008-25083, JP 2009-185408, and JP 2010-84317. And those disclosed in Japanese Patent Laid-Open No. 2014-68954 and the like can be used. Further, for example, a large number of apertures 23, 23,... Are formed in the liquid-permeable surface sheet 3 provided with the convex portions 3a and the concave portions 3b disclosed in Japanese Unexamined Patent Application Publication No. 2004-466 and Japanese Unexamined Patent Publication No. 2003-250836. You may use what gave.

  It is preferable that the height (thickness) of the convex portion 3a is higher by about 0.1 mm to 15 mm than the height (thickness) of the concave portion 3b. The width of the recess 3b (the width in the pad width direction) is formed to be larger than the width of the opening 23.

  The concave groove 22 can be arranged in various forms. As shown in FIG. 1, it is preferable to form only one groove in the center portion in the pad width direction corresponding to the urine discharge site H and in the middle portion in the longitudinal direction, as shown in FIG. As shown in A) and (B), a plurality of strips may be formed apart in the pad width direction, or as shown in FIG. You may form in a shape. When a plurality of strips are formed, the urine diffusion effect can be more reliably enhanced even when a large amount of urine is discharged at once. Moreover, when it forms in a discontinuous line shape, the crushing when the ditch | groove 22 receives external forces, such as leg pressure, from the width direction both sides can be prevented more reliably. When a plurality of strips are formed apart in the pad width direction, the even strips shown in FIG. 9A or the odd strips shown in FIG. 9B may be used.

  Further, the planar shape of the concave groove 22 may be formed with a uniform width along the longitudinal direction of the pad as shown in FIG. 1, or with a different groove width as shown in FIG. Also good. In FIG. 10A, a widened portion 22a having an enlarged groove width is provided at the front end portion of the concave groove 22 in the pad longitudinal direction. By providing the widened portion 22a, a temporary storage space for urine can be expanded, and even when a large amount of urine is discharged at a time such as urge incontinence, the urine can be reliably received by the groove 22 It becomes. The widened portion 22a may be provided at the end portion on the rear side of the pad as shown in FIG. 10 (B), or may be provided at the front and rear end portions as shown in FIG. 10 (C).

  As shown in FIG. 11, the concave groove 22 may be provided with one or a plurality of branch portions 22b and 22c. By providing the branch portions 22b and 22c, the urine temporarily stored in the concave groove 22 is diffused along the concave groove 22 to a wide area of the absorbent body 4, and the urine is spread over a wider area of the absorbent body 4. Can absorb. In the example shown in FIGS. 11 (A) to 11 (C), the branching portion 22b extends outward from both side edges of the groove 22 on the front side, the rear side, or the front side and the rear side in the pad longitudinal direction, There are provided a plurality of inclining toward the end in the longitudinal direction of the pad, three each on the left and right in the illustrated example. Further, in the example shown in FIGS. 11D to 11F, as the branching portion 22c, a plurality of concave grooves 22 are radially formed at the front end, the rear end or the front end and the rear end in the pad longitudinal direction. In the example shown, the one that is branched into five is provided.

  In addition, when providing the said absorber recessed part 20 in the formation planned part of the recessed groove 22 of the absorber 4 previously, the absorber recessed part 20 is provided along the shape of the said recessed groove 22.

  In the above embodiment, the absorber recess 20 is formed in the shape of a groove with a bottom as shown in FIG. 2, but as shown in FIG. 12, the slit penetrated from the front side to the back side. You may form in a shape. When the absorber recess 20 is slit-shaped, the embossed portion 21 has a liquid-impermeable back sheet 2 that penetrates the absorber recess 20 disposed on the bottom surface of the absorber recess 20 as shown in FIG. To be applied to. Even when the absorber recess 20 is formed in a slit shape and the absorber 4 is not interposed at the bottom of the groove 22, urine is absorbed through the liquid-permeable surface sheet 3 interposed at the bottom of the groove 22. Since the urine absorbed in the liquid-permeable surface sheet 3 on the bottom surface of the groove is diffused along the groove 22, a decrease in absorption performance is suppressed to a slight extent. In particular, when the liquid-permeable surface sheet 3 is formed with the above-mentioned uneven shape and the uneven shape is maintained even at the bottom of the concave groove 22, the urine absorbability and diffusibility are hardly lowered.

  The embossing width A of the embossed portion 21 applied from the surface side of the liquid-permeable topsheet 3 when forming the recessed groove 22 may be substantially equal to the groove width B of the absorber recessed portion 20, and is shown in FIG. Thus, you may provide with the emboss width A smaller than the groove width B of the absorber recessed part 20 (A <B). That is, in the state which embossed from the surface side of the liquid-permeable surface sheet 3, as shown in FIG. 13, the liquid-permeable surface sheet which interposes in the both sides | surfaces of the absorber recessed part 20, and this absorber recessed part 20 3, spaces (buffer zones Z) are formed respectively. In this buffer zone Z, as shown in FIG. 14A, the urine that has flowed into the concave groove 22 permeates the liquid-permeable surface sheet 3, and the side surface of the absorber recess 20 and the liquid-permeable surface sheet 3 The urine temporarily stored in the buffer zone Z diffuses in the front-rear direction along the absorber recess 20 and passes through the side surface of the absorber recess 20. It will be absorbed and held inside. For this reason, even when a large amount of urination occurs at a stretch, urine can be absorbed quickly by being temporarily stored in the buffer zone Z.

  Further, since the absorber recess 20 is formed without being squeezed, as shown in FIG. 14B, urine penetrates into the absorber recess 20 and the polymer 8 around the absorber recess 20 When the pulp expands due to water absorption, the bulge of the bottom can be suppressed to be extremely small as compared with the case where a high density region of pulp or polymer is formed at the bottom by pressing. Moreover, since the embossed part 21 is given with respect to this absorber recessed part 20 with respect to the bottom face of the absorber recessed part 20 from the surface side of the liquid-permeable surface sheet 3, both the side surfaces of the absorber recessed part 20 swell inside. Even if it comes out, since it acts so as to firmly hold down both side surfaces of the absorber recess 20 to be expanded by the tension of the liquid-permeable surface sheet 3 interposed in the absorber recess 20, expansion of both sides can be suppressed to a small level. It becomes like this. Therefore, it is possible to prevent the absorbent recess 20 from being blocked by the polymer 8 or the pulp that has expanded during liquid absorption, thereby reducing the urine absorbability.

  Furthermore, in this incontinence pad 1, the embossed squeezed holes 23 are formed in the pad width direction by expanding the embossed portions 21 that form the recessed grooves 22 in the pad width direction. When the liquid-permeable surface sheet 3 is in contact with the side surface of the absorber recess 20 sometimes, the opening of the openings 23 may be prevented. On the other hand, as described above, the emboss width A of the concave groove 22 is made smaller than the groove width B of the absorber concave portion 20, and the buffer zone Z is formed between the side surface of the absorber concave portion 20 and the liquid-permeable surface sheet 3. By providing, the liquid-permeable surface sheet 3 separates from the side surface of the absorber recessed part 20, and the open hole 23 ... is freely expanded at the time of embossing pressing.

  The ratio A / B between the emboss width A and the groove width B of the absorber recess 20 is 0.5 or more and less than 1, preferably 0.5 or more and less than 0.8. Thereby, while the urine which permeate | transmitted between the side surface of the absorber recessed part 20 and the liquid-permeable surface sheet 3 is temporarily stored, the buffer used as a buffer area | region when the highly water-absorbing polymer 8 or pulp absorbs water and swells. Zones Z and Z are appropriately formed.

[Other examples]
In the above embodiment, the incontinence pad 1 has been described as an example. However, as shown in FIG. 15, the groove structure according to the present invention is made of cotton-like pulp or synthetic pulp, for example, an hourglass shape (or rectangular shape). Etc.), a liquid-permeable surface sheet 3 that quickly transmits urine and the like disposed so as to cover the skin surface side (use surface side) of the absorber 4, A liquid-impervious leak-proof sheet 2 made of a polyethylene sheet or the like disposed on the non-skin surface side (non-use surface side) of the absorbent body 4 and covering at least the entire area of the absorbent body 4; In order to form the nonwoven fabric provided on the outer surface side (non-skin surface side) of the leak-proof sheet 2, and to maintain the outer back sheet 2a that defines the outer shape of the diaper and to improve the shape and diffusibility of the absorbent body 4, Crepe paper and non-woven fabric surrounding the absorbent body 4 Left and right provided in a predetermined section in the longitudinal direction so as to include at least a urine discharge site, with a substantially side edge portion of the absorbent body 4 as an upright base end A disposable diaper 1A mainly composed of a pair of three-dimensional gather BS, side nonwoven fabrics 7 and 7 forming BS, and mechanical joining type fastening tapes F and F provided on both sides of the diaper rear side (back side) Can be adopted as well. Moreover, although the tape-type disposable diaper was shown in FIG. 15, it is employable similarly to a pants-type disposable diaper. Further, in FIG. 15, a typical concave groove structure is illustrated among the above-described embodiments, but all the modifications described in the above-described embodiments can be similarly employed.

  DESCRIPTION OF SYMBOLS 1 ... Incontinence pad, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 7 ... Side nonwoven fabric, 8 ... Super absorbent polymer, 10 ... Inside solid gather , 11 ... outer three-dimensional gather, 12 · 13 ... thread-like elastic elastic member, 20 ... absorber recess, 21 ... embossed part, 22 ... recessed groove, 23 ... opening

Claims (4)

Embossing is performed from the surface side of the liquid-permeable surface sheet in a state where the absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and the liquid-permeable surface sheet is laminated on the absorber. By the absorbent article in which a ditch is formed along the longitudinal direction on the skin side,
The liquid-permeable surface sheet is composed of a nonwoven fabric provided with a large number of apertures having a long planar shape in the longitudinal direction of the absorbent article, and is formed with at least the concave groove forming region. The absorbent article, wherein the opening provided in the opening is expanded in the width direction of the absorbent article.   The liquid-permeable surface sheet has convex portions having a relatively high basis weight and concave portions having a relatively low basis weight that extend in the longitudinal direction of the absorbent article and are alternately and repeatedly formed in the width direction of the absorbent article. The absorbent article according to claim 1, wherein the opening is provided in the recess. The absorbent body has a groove-shaped or slit-shaped absorbent body on the surface of the liquid-permeable surface sheet side along the longitudinal direction of the absorbent article and over the longitudinal range including the urine discharge site without being squeezed. With a recess,
The groove is embossed along the absorber recess from the surface side of the liquid permeable surface sheet to the bottom surface of the absorber recess in a state where the liquid permeable surface sheet is laminated on the absorber. The absorptive article according to claim 1 or 2 currently formed.   The absorbent article according to claim 3, wherein the emboss is provided with an emboss width smaller than a groove width of the absorber recess.

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