JP2016052398A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a surface sheet from being torn during the wearing, and to improve absorption efficiency of urine inside a recessed groove.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 of a wavy cross section in which projected parts 3a and recessed parts 3b extending in the longitudinal direction of the incontinence pad 1 are alternately and repeatedly formed in a width direction of the incontinence pad 1, and the projected parts 3a and the recessed parts 3b at least provided in an area where the recessed groove 22 is formed extend in the width direction of the incontinence pad 1 while the recessed groove 22 is formed.SELECTED DRAWING: Figure 7

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.

  Here, when a normal flat nonwoven fabric was used as the surface sheet, when the embossing for forming the concave groove was performed, the surface sheet was stretched by the depth of the concave groove, so this excessively stretched There was a possibility that the strength of the surface sheet of the portion was reduced and tearing occurred during mounting.

  In addition, since the surface sheet in the groove is stretched in the width direction by embossing and disposed in a state where the surface is stretched, the contact area between the surface sheet and urine does not become larger than the surface area of the groove, The improvement of absorption efficiency was not expected.

  Therefore, the main problem of the present invention is to prevent tearing of the surface sheet during wearing in the absorbent article in which the groove is formed along the longitudinal direction on the skin side, and improve the efficiency of absorbing urine in the groove. It is to provide an absorbent article.

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 formed of a nonwoven fabric having a corrugated cross section in which convex portions and concave portions extending in the longitudinal direction of the absorbent article are alternately and repeatedly formed in the width direction of the absorbent article, and the concave grooves are formed. In this state, an absorbent article is provided in which at least the convex portions and the concave portions provided in the concave groove forming region are extended in the width direction of the absorbent article.

  In the invention of claim 1, as the liquid-permeable surface sheet, a corrugated non-woven fabric in which convex portions and concave portions extending in the longitudinal direction of the absorbent article are alternately and repeatedly formed in the width direction of the absorbent article is used. Yes. And in the state which formed the said ditch | groove, the convex part and recessed part of the liquid-permeable surface sheet provided in the formation area of the said ditch | groove were each extended | stretched in the width direction of the absorbent article. For this reason, even when the corrugated processing of the liquid-permeable surface sheet becomes a buffer and the concave groove is formed by embossing from the surface side of the liquid-permeable surface sheet, the liquid-permeable surface sheet is not excessively pulled. For this reason, the strength of the liquid-permeable surface sheet is not reduced, and tearing during mounting can be prevented. In addition, in the state where the concave groove is formed, the liquid-permeable surface sheet in the groove is not completely extended, and an uneven shape remains, so that the contact area between the liquid-permeable surface sheet and urine increases, Absorption efficiency can be improved. On the other hand, since the liquid-permeable surface sheet is formed in a corrugated cross section, the contact area with the skin is reduced, and the skin feels soft and soft.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the liquid-permeable surface sheet is provided with a number of apertures.

  In the second aspect of the invention, by providing a large number of apertures in the liquid-permeable surface sheet, urine permeates through the apertures, so that the urine absorption speed can be further increased.

  The present invention according to claim 3 provides the absorbent article according to any one of claims 1 and 2, wherein the wavy pitch is ½ or less of the depth of the concave groove.

  In the invention of claim 3, in the state where the concave groove is formed, the corrugated shape of the liquid-permeable surface sheet is formed so that the uneven shape of the liquid-permeable surface sheet is surely formed on both side surfaces of the concave groove. The pitch is set to ½ or less of the depth of the groove.

As this invention which concerns on Claim 4, the said absorber is not based on compression over the longitudinal direction range which includes a urine discharge | emission site | part while being along the longitudinal direction of an absorbent article on the surface of the said liquid-permeable surface sheet side. 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. The absorbent article in any one of Claims 1-3 currently formed is provided.

  In the invention described in claim 4, 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 concave groove is formed by embossing the bottom surface of the absorbent concave portion along the absorbent concave portion, the concave groove is formed compared with the case where the concave groove is formed by pressing together with the absorbent body. 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 described above in detail, according to the present invention, it is possible to prevent tearing of the seat being mounted, and to improve the efficiency of absorption of urine in the groove.

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. 3 is a perspective view of a liquid-permeable top sheet 3. FIG. FIG. 5 is a cross-sectional view showing a processing procedure for a concave groove 22. It is an expanded sectional view of the ditch | groove 22 which shows the transfer path | route of urine. It is sectional drawing which shows the liquid-permeable surface sheet 3 which concerns on another form example. (A), (B) is sectional drawing of the liquid-permeable surface sheet 3 of the pad width direction. It is sectional drawing which shows the processing point of the ditch | groove 22 which concerns on the other form example. It is a cross-sectional perspective view of the ditch | groove 22 which concerns on the other form example. (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. FIG. 6 is an enlarged cross-sectional view showing another example of the recessed groove 22. (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 that has been subjected to a predetermined corrugated process. 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 top sheet 3 will be described in 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.

  The concave groove 22 may be formed by integrally squeezing components from the surface side of the liquid-permeable surface sheet 3 to the absorber 4 from the surface side of the liquid-permeable surface sheet 3. The absorbent body recess 20 is formed in a portion where the concave groove 22 is to be formed, and the constituent member that is above the absorbent body 4 from the surface side (skin surface side) of the liquid-permeable surface sheet 3 along the absorber recess 20. The one formed by providing the embossed portion 21 that squeezes the surface with the embossed convex portion 24 is preferable because the deformation of the concave groove 22 due to leg pressure can be prevented (see FIG. 6).

  In the incontinence pad 1, the absorbent body 4 is formed in the absorbent body 4 in advance in a groove shape or a slit shape without being squeezed, and in the illustrated example, the concave portion of the absorbent body is formed in the groove shape. 20 is 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. 12 to 12). (See FIG. 14). 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 detail. As shown in FIG. 5, the liquid-permeable surface sheet 3 is composed of a non-woven fabric having a corrugated cross section in which convex portions 3 a and concave portions 3 b extending in the longitudinal direction of the incontinence pad 1 are alternately and repeatedly formed in the pad width direction. ing. The convex portion 3 a and the concave portion 3 b extend linearly substantially parallel to the longitudinal direction of the incontinence pad 1. The convex portions 3a and the concave portions 3b are continuously connected in the pad width direction, and are alternately arranged so as not to have a flat portion. The convex portion 3a is curved convexly toward the skin side, and the concave portion 3b is curved convexly toward the non-skin side. The convex portion 3a extends along the longitudinal direction of the pad and forms a collar portion. The concave portion 3b also extends along the pad longitudinal direction and forms a groove.

  As shown in FIG. 6, the liquid-permeable surface sheet 3 is laminated on the skin side surface of the absorbent body 4, and is embossed by the embossed convex portions 24 from the surface side (skin surface side) of the liquid-permeable surface sheet 3. The concave groove 22 is formed by applying the portion 21. In the state where the concave groove 22 is formed, at least the convex portion 3a and the concave portion 3b of the liquid-permeable surface sheet 3 provided in the formation region of the concave groove 22 are extended in the pad width direction. The extension in the pad width direction means that the liquid-permeable surface sheet 3 is stretched by the depth of the concave groove 22 by embossing, and the convex curved shape of the convex portions 3a and concave portions 3b is released or reduced. This is a state in which the liquid-permeable surface sheet 3 is stretched in the pad width direction.

  Thereby, in the processing of the concave groove 22, the wave-like processing of the liquid-permeable surface sheet 3 becomes a buffer, and the liquid-permeable surface sheet 3 is not excessively pulled. It is possible to prevent tearing during mounting without reducing the above.

  Further, as shown in FIG. 7, even in the state where the concave groove 22 is formed, the liquid-permeable surface sheet 3 does not completely extend and a concavo-convex shape remains, so that the liquid-permeable surface sheet is compared with a normal flat sheet. Since the contact area between the urine 3 and urine increases, urine absorption efficiency can be increased.

  On the other hand, in the liquid-permeable surface sheet 3 having a wavy cross section, the convex portion 3a comes into contact with the skin surface, so that the contact area with the skin is reduced, and the skin is gentle and soft. Become.

  The structure of the liquid-permeable surface sheet 3 will be described in more detail. The region formed in the cross-sectional wave shape may be formed over the entire surface of the liquid-permeable surface sheet 3, as shown in FIG. A range in which the liquid-permeable surface sheet 3 is in contact with the skin surface, specifically, a range between the left and right side nonwoven fabrics 7 and 7 may be used. Thereby, all the liquid-permeable surface sheets 3 which touch a skin surface will be formed in a cross-sectional wave shape, and it will become a soft touch gentle to skin. The corrugated region may be formed in a region including at least the concave groove 22. When only the region including the concave groove 22 is formed, it is preferable to form the concave groove 22 in the width direction range and a predetermined range on both sides thereof. Specifically, it is preferable that the predetermined range on both sides is a range on both sides that is approximately the same as the groove width of the concave groove 22. Thereby, the liquid-permeable surface sheet 3 in contact with the urine discharge site and the surrounding skin surface is formed in a corrugated cross-section, and the skin touch is gentle and soft in a particularly delicate portion.

  The wavy pitch (interval in the pad width direction between the tops of adjacent convex portions 3a, 3a or concave portions 3b, 3b) is ½ or less of the depth of the concave groove 22, preferably 1/10 to ３. It is good to do. Thereby, two or more convex portions 3a and concave portions 3b are formed on both side surfaces of the concave groove 22, respectively, and it becomes easy to serve as a buffer at the time of embossing, and the urine absorption performance can be reliably improved.

  The height difference between the convex portion 3a and the concave portion 3b is preferably 0.1 mm to 5 mm, and more preferably 0.4 mm to 1.5 mm. As shown in FIG. 6, when processing the embossed portion 21, only the height difference between the convex portion 3 a and the concave portion 3 b so that the concave-convex shape of the liquid-permeable surface sheet 3 is held on the side surface of the concave groove 22, or It is preferable to provide a slightly smaller gap S between the embossed convex portion 24 and the side surface of the absorber concave portion 20.

  In order to perform wave processing on the liquid-permeable surface sheet 3, the liquid-permeable surface sheet 3 is made to pass between processing rolls having a surface formed in a wave shape and heated to the vicinity of the surface material softening point. It can be carried out.

  The cross-sectional shape of the liquid-permeable surface sheet 3 in the pad width direction is, as shown in FIG. 9A, a convex portion 3a that curves convexly on the skin side and a concave portion that curves convexly on the non-skin side. 9b may be used, or, as shown in FIG. 9B, an irregular wave shape in which convex portions 3a that are convexly curved on the skin side are connected by a flat portion 3c may be used. In addition, it is good also as a wave form which formed both the said convex part 3a and the recessed part 3b in the trapezoid shape.

  The said liquid-permeable surface sheet 3 may provide many opening 25,25 ... as FIG. 8 shows. By providing the openings 25, 25... Urine permeates through the openings 25, so that the urine permeability can be further improved. In the illustrated example, the openings 25 are provided only in the concave portion 3b of the liquid-permeable surface sheet 3, but may be provided only in the convex portion 3a, or may be provided in both the convex portion 3a and the concave portion 3b. Good. The planar shape of the opening 25 is preferably a shape that is long in the longitudinal direction of the pad, such as an ellipse that is long in the longitudinal direction of the pad, an oval, or a rectangle. Thereby, when the embossed portion 21 is provided, the opening 25 is expanded in the pad width direction, and urine is more easily transmitted through the expanded opening 25.

  The liquid-permeable surface sheet 3 may be a non-woven fabric composed of only one layer, or may have a multilayer structure of two or more layers. In the case of a multilayer structure, the layer in contact with the skin surface can be a nonwoven fabric, and the layer on the absorber 4 side can be formed of a nonwoven fabric or a plastic film.

  As shown in FIGS. 6 and 7, when the embossed portion 21 is provided by the embossed convex portion 24, the concave groove 22 has a predetermined gap between the tip of the embossed convex portion 24 and the bottom surface of the absorber concave portion 20. Embossing can be provided to such an extent that it is provided or substantially touched. As a result, as shown in FIG. 6, the bottom surface of the groove 22 is formed in a cross-sectional wave shape by the restoring force of the cross-sectional wave-shaped liquid-permeable surface sheet 3 after embossing, and the liquid-permeable surface sheet 3 and the urine are in contact with each other. The area increases and urine easily moves to the absorber 4.

  On the other hand, as shown in FIGS. 10 and 11, when the embossed portion 21 is provided by the embossed convex portion 24, the concave groove 22 strongly compresses the bottom surface of the absorber concave portion 20 at the tip of the embossed convex portion 24. Further, embossing may be performed while heating the tip of the embossing convex portion 24 to the melting temperature of the liquid-permeable surface sheet 3. Accordingly, as shown in FIG. 11, in the convex portion 3 a having a wavy cross section of the liquid-permeable surface sheet 3, the fibers gather together at the time of pressing, and the high fiber density portions 26, 26. Will be formed. This high fiber density portion 26 improves the diffusibility of urine along the concave groove 22 and acts to maintain the shape so that the concave groove 22 is not crushed by leg pressure or the like.

  The concave groove 22 can be arranged in various forms. As shown in FIG. 1, the concave groove 22 is preferably formed in the middle of the longitudinal direction in the center in the pad width direction corresponding to the urine discharge site H, but only one strip is formed in FIG. As shown in A) and (B), a plurality of strips may be formed apart from each other in the pad width direction. Alternatively, 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. 12 (A) or the odd strips shown in FIG. 12 (B) 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 may be formed with a different groove width as shown in FIG. Also good. In FIG. 13A, 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. 13 (B), or may be provided at the front and rear end portions as shown in FIG. 13 (C).

  As shown in FIG. 14, the concave groove 22 may be provided with one or a plurality of branch portions 22 b and 22 c. 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. 14A to 14C, 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. 14D to 14F, as the branching portion 22c, a plurality of concave grooves 22 are radially formed on the front end, the rear end, or the front end and the rear end in the longitudinal direction of the pad. 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. 15, 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 an 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 in a corrugated shape like the incontinence pad 1 and the corrugated shape is maintained even at the bottom of the concave groove 22, there is almost no decrease in urine absorbability and diffusibility. Does not occur.

  The embossed 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. 16, 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. 17 (A), 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.

  In addition, since the absorber recess 20 is formed without being squeezed, as shown in FIG. 17B, 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, since the wave-like cross section provided in the formation area of the ditch | groove 22 is extended by squeezing the embossing part 21 which forms the ditch | groove 22, the liquid-permeable surface sheet 3 at the time of embossing squeezing If it is in contact with the side surface of the absorber recess 20, the expansion of the wavy cross section may be hindered. 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 leaves | separates from the side surface of the absorber recessed part 20, and a free elongating of a wavy cross section comes to be performed 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.

  In the above embodiment, the incontinence pad 1 has been described as an example. However, as shown in FIG. 18, 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. 18, it is employable similarly to a pants-type disposable diaper. Moreover, in FIG. 18, although the typical ditch | groove structure was illustrated among the said form examples, all the modifications demonstrated by the said form example are employable similarly.

  DESCRIPTION OF SYMBOLS 1 ... Incontinence pad, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 3a ... Convex part, 3b ... Concave part, 4 ... Absorber, 5 ... Encapsulating sheet, 7 ... Side nonwoven fabric, 8 ... High Water-absorbing polymer, 10 ... inner solid gather, 11 ... outer solid gather, 12.13 ... thread-like elastic elastic member, 20 ... absorbent recess, 21 ... embossed portion, 22 ... recessed groove

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 formed of a nonwoven fabric having a corrugated cross section in which convex portions and concave portions extending in the longitudinal direction of the absorbent article are alternately and repeatedly formed in the width direction of the absorbent article, and the concave grooves are formed. In the state, the said convex part and recessed part provided in the formation area of the said ditch | groove are extended in the width direction of the absorbent article, Absorbent article characterized by the above-mentioned.   The absorbent article according to claim 1, wherein the liquid-permeable surface sheet is provided with a large number of apertures.   The absorbent article according to claim 1, wherein the wavy pitch is ½ or less of the depth of the concave groove. 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 absorbent article in any one of Claims 1-3 currently formed.

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