JP6457764B2 - Absorbent articles - Google Patents

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. An absorbent article is disclosed in which a recess extending in the form of a hollow is formed by embossing, and a high pressing portion and a low pressing portion are alternately formed on the bottom thereof.

  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

  However, in the absorbent article described in Patent Document 1, the recesses are embossed for the purpose of improving the absorbability associated with the liquid transferability between the absorbent layers, maintaining flexibility and providing a good wearing feeling, and the like. Since it is formed and has a high-pressure squeezed part and a low-pressure squeezed part at its bottom, there are the following problems.

  (1) Since the high-pressure squeezed part is further squeezed from the bottom of the concave part, the topsheet is stretched excessively and easily breaks. (2) A fine high-pressure squeezed part and a low-pressure squeezed part are formed at the bottom of the concave part. Since it is provided alternately, there are technical difficulties such as embossing rolls clogged with paper dust and lowering operability. (3) Depending on the conditions of the high-pressure and low-pressure parts, urine There is also a problem that it is difficult to physically cause migration and diffusibility.

  Moreover, since the absorbent article described in Patent Document 2 is simply provided with a recess in the absorbent body, it has low rigidity when subjected to leg pressure from both sides in the width direction during mounting, and the concave groove is easily deformed. There was a problem.

  Therefore, the main problem of the present invention is to prevent the tearing of the surface material, improve the urinary transferability / diffusibility, facilitate the maintenance of the groove shape, and stabilize the manufacturing operability. It is to provide.

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 large number of convex portions having a relatively high basis weight, and concave portions that are formed around the convex portion and have a relatively low basis weight.
In the state where the concave groove is formed, the bottom of the concave groove is formed in a flat planar shape, and a plurality of high-compression portions in which the convex portions of the liquid-permeable surface sheet are compressed, and the liquid-permeable surface An absorbent article is provided in which a concave portion of a sheet is compressed to form a low compression portion having a density lower than that of the high compression portion.

In the first aspect of the present invention, the liquid-permeable surface sheet is formed in a concavo-convex shape with different basis weights. In the state where the concave groove is formed by embossing from the surface side of the liquid-permeable surface sheet with a flat planar embossed convex portion, the bottom of the concave groove is formed into a flat planar shape, and A large number of high compression portions in which the convex portions of the liquid-permeable surface sheet are compressed and a low compression portion having a density lower than that of the high compression portions in which the concave portions are compressed are formed. Due to the difference in density of the fibers, the transferability / diffusibility of urine absorbed by the liquid-permeable surface sheet is improved. Moreover, since a high compression part and a low compression part can be formed only by embossing from the surface side of a liquid-permeable surface sheet once, what provided the high pressing part compressed further from the bottom face of a ditch | groove like before In comparison with this, the tensile stress is not excessively applied to the surface material, and the surface material can be prevented from being torn. Furthermore, since many high compression parts are formed in the bottom part of a ditch | groove, the rigidity of a ditch | groove increases, the deformation | transformation with respect to external forces, such as leg pressure, can be prevented, and it becomes easy to maintain the shape of a ditch | groove. Moreover, since the high compression part and the low compression part are formed by embossing by the flat embossing convex part with a flat front end from the surface side of a liquid-permeable surface sheet, ie, giving flat embossing. There is no clogging of the embossing roll and the operability of manufacturing is stabilized.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the high compression portion is arranged in a staggered pattern or a lattice pattern in a plan view.

  In the invention of claim 2, by arranging the high compression portions in a staggered pattern or a lattice shape in plan view, the rigidity of the concave grooves is increased, the deformation of the concave grooves can be prevented, and the density of the fibers can be prevented. The transferability / diffusivity of urine due to the difference is further improved.

  As this invention which concerns on Claim 3, the said liquid-permeable surface sheet consists of a laminated structure of the upper layer arrange | positioned by the skin side, and the lower layer arrange | positioned by the absorber side, and the said lower layer contains a heat-shrinkable fiber. An absorbent article according to any one of claims 1 and 2 comprising a nonwoven fabric is provided.

  In the invention of claim 3, the liquid-permeable surface sheet has a laminated structure in which an upper layer and a lower layer are laminated as the liquid-permeable surface sheet, and the lower layer is composed of a nonwoven fabric containing heat-shrinkable fibers, whereby the liquid-permeable surface sheet is After being consolidated in the direction and partially joined at a joint portion of a predetermined pattern, the lower layer is heat-treated and thermally contracted, thereby forming a number of convex portions where portions other than the joint portion protrude toward the skin side. It becomes like this.

As a fourth aspect of the present invention, a plurality of the high compression portions are arranged in the groove width direction of the groove, and the low compression portions are continuously provided over the entire bottom surface of the groove. The absorbent article in any one of 1-3 is provided.

In the invention according to the fourth aspect , a plurality of high compression portions are disposed in the groove width direction of the groove, and the low compression portion is continuously provided over the entire bottom surface of the groove. Therefore, since the high compression portion and the low compression portion exist in the groove width direction, diffusion of urine along the groove longitudinal direction is not hindered.

  As described above in detail, according to the present invention, it is possible to prevent tearing of the surface material, improve urine migration / diffusibility, easily maintain the groove shape, and stabilize the operability of production. Become.

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. 3 is a cross-sectional view of a liquid-permeable top sheet 3. FIG. (A)-(C) are process drawings which show the manufacturing method of the liquid-permeable surface sheet 3. FIG. FIG. 5 is a cross-sectional view showing a processing procedure for a concave groove 22. 3 is an enlarged cross-sectional view of a concave groove 22. FIG. 3 is an enlarged plan view of a concave groove 22. FIG. (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.

  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.

  Next, the liquid-permeable surface sheet 3 is made of a nonwoven fabric. As a material fiber constituting this nonwoven fabric, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester, polyamide, etc., recycled fibers such as rayon and cupra, natural fibers such as cotton, A nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond 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 dissolving pulp, and artificial cellulose fibers such as rayon and acetate. 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 liquid-permeable surface sheet 3]
As shown in FIGS. 5 and 6, the liquid-permeable surface sheet 3 is formed with a relatively high basis weight and has a large number of dome-shaped convex portions 15, 15. Each is formed along the periphery of the convex portion 15, and has a relatively low basis weight compared to the convex portion 15, and a concave portion 16 that is recessed toward the skin side from the convex portion 15.

  As the liquid-permeable surface sheet 3 having such an uneven shape, those disclosed in Japanese Patent Application Laid-Open Nos. 2004-466 and 2003-250836 can be used. In these gazettes, a large number of dome-shaped parts that are partially joined by a large number of joints 17, 17... In a predetermined pattern consolidated in the thickness direction, and parts other than the joints 17, 17. Are made of the convex portions 15, 15. The joint portions 17, 17... Are arranged in a zigzag plane pattern, and the convex portions 15, 15... Are arranged in a zigzag plane pattern.

  Further, as disclosed in the publication, the liquid-permeable surface sheet 3 is disposed on the skin 4 side and the absorber 4 side as shown in FIGS. 5 and 6. It is preferable to form a laminated structure with the lower layer 3B. The upper layer 3A and the lower layer 3B are partially joined at the numerous joints 17, 17.

  The lower layer 3B is preferably composed of a nonwoven fabric containing heat-shrinkable fibers that exhibit thermoplasticity. That is, by forming the lower layer 3B from a nonwoven fabric including heat-shrinkable fibers, the upper layer 3A and the lower layer 3B are joined at the joint portion 17, and then the lower layer 3B is thermally contracted to thereby join the joint portion 17 of the upper layer 3A. The part surrounded by is protruding so as to protrude to the skin side.

  As shown in FIG. 7 (A), the manufacturing method of the liquid-permeable surface sheet 3 is a state in which the upper layer 3A is laminated as shown in FIG. 7 (B) in a state where the upper layer 3A and the lower layer 3B are laminated. After the upper layer 3A and the lower layer 3B are partially joined by a large number of joints 17, 17... In a predetermined pattern by pressing from the outer surface side, the heat contained in the lower layer 3B as shown in FIG. It is performed by shrinking the lower layer 3B by performing a heat treatment such as applying warm air at a temperature higher than the temperature at which the shrinkable fiber starts to shrink. When the lower layer 3B is thermally shrunk, the space between the adjacent joints 17 and 17 is narrowed, so that the fibers of the upper layer 3A between them are gathered together and the basis weight becomes relatively high, and is surrounded by the joints 17, 17. As the area goes to the center side, the basis weight becomes higher, and a convex part 15 protruding toward the skin side is formed in a dome shape.

  Moreover, as shown in the publication, the fiber density of the lower layer 3B may be set higher than the fiber density of the upper layer 3A. In such a liquid-permeable surface sheet 3, urine quickly moves from the upper layer 3A having a relatively low fiber density toward the lower layer 3B having a relatively high fiber density due to the fiber density gradient.

[About the groove 22]
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. 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 incontinence pad 1, as shown in FIG. 2, the absorbent body 4 has urine drainage on the skin side (liquid-permeable surface sheet 3 side) surface in advance in the portion where the concave groove 22 is to be formed. Along the longitudinal direction including the portion H, an absorbent recess 20 having a groove shape or a slit shape, in the illustrated example, is formed without being squeezed. 2 has a non-skin contact surface side (liquid-impervious back sheet 2 side) from the periphery on the skin contact surface side (liquid-permeable surface sheet 3 side) of the absorbent body 4. ) Is a non-penetrating concave groove portion having a bottom surface. 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. 11 to 11). (See FIG. 13). In addition, when providing the some absorber recessed part 20, it is preferable to provide the embossed part 21 with respect to each absorber recessed part 20. As shown in FIG.

  As for the planar dimensions of the absorber recess 20, the length in the pad longitudinal direction is preferably 100 to 180 mm, and the groove width (bottom groove width) is 5 to 30 mm. The depth of the absorber recess 20 is preferably 50% or more of the thickness of the absorber 4, specifically about 5 to 8 mm.

  The absorber 4 is preferably set so that the density of the bottom surface of the absorber recess 20 and the density of the periphery (portion other than the absorber recess 20) are substantially the same. That is, the density of the absorbent body can be made substantially the same by forming the absorbent body concave part 20 in a concave groove shape without squeezing.

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.

  In the incontinence pad 1, as shown in FIG. 8, the absorbent body is absorbed by the embossed convex part 24 in a state where the liquid-permeable surface sheet 3 is laminated on the skin side of the absorbent body 4 in which the absorbent body recessed part 20 is formed. An embossed portion 21 is provided on the bottom surface of the recess 20. Accordingly, as shown in FIGS. 9 and 10, a large number of high compression portions 18, 18... In which the convex portions 15, 15. While being formed, a low compression portion 19 having a density lower than that of the high compression portion 18 in which the concave portion 16 of the liquid-permeable surface sheet 3 is compressed is formed.

  The high compression portion 18 is a portion which is relatively densified from the surrounding low compression portion 19 by compressing the convex portion 15 formed with a relatively high basis weight of the liquid-permeable surface sheet 3. is there. The density of the high compression portion 18 is relatively higher than the density of the low compression portion 19, specifically 5% to 50%, preferably 10% to 50%, more preferably the density of the low compression portion 19. It is better to set it about 20% to 50% higher.

  The boundary between the high compression portion 18 and the low compression portion 19 is not necessarily clear, and the top portion of the convex portion 15 before embossing the liquid-permeable surface sheet 3 and a relatively high range of a predetermined range in the vicinity thereof. The portion formed with the basis weight can be defined as the high compression portion 18, and the other portion can be defined as the low compression portion 19.

  The embossing convex part 24 is formed narrower than the absorber recess 20 and embosses only the bottom surface of the absorber recess 20. Therefore, at least the thickness of the liquid-permeable surface sheet 3 is not provided between the side surface of the absorber concave portion 20 and the side portion of the embossed convex portion 24 so that the convex portion 15 of the liquid-permeable surface sheet 3 is not crushed by embossing. A gap S corresponding to the thickness of the convex portion 15 is provided. The tip of the embossing convex part 24 is formed in a flat planar shape, and a substantially uniform compressive force is applied to the bottom surface of the absorber concave part 20.

  By providing the high compression portion 18 and the low compression portion 19 at the bottom of the concave groove 22, diffusibility of urine due to fiber density difference of the liquid-permeable surface sheet 3 is improved, and the diffused urine is quickly absorbed by the absorbent body. To move on.

  Moreover, since the high compression part 18 and the low compression part 19 can be formed only by embossing the bottom surface of the absorber concave part 20 once by the flat embossing convex part 24 having a flat tip, the conventional absorptivity. After the embossing for the low-pressure squeezing part such as the article is applied, the trouble of applying the embossing for the high-pressure squeezing part is not required, and the surface sheet by applying the high-pressure squeezing part deeper than the low-pressure squeezing part Excessive stretching is eliminated, and tearing of the topsheet can be prevented.

  Furthermore, since a large number of high compression portions 18 are formed at the bottom of the concave groove 22, the rigidity of the concave groove 22 is increased, and deformation of the concave groove 22 can be prevented even when an external force such as leg pressure is applied from both sides in the width direction. The shape of the concave groove 22 can be easily maintained. Therefore, a urine storage space can be secured and urine leakage can be prevented.

  Further, since the embossed portion 21 is provided by the embossed convex portion 24 having a flat tip, the embossed convex portion 24 is not clogged with paper dust and the like, and the operability of the manufacturing process is stabilized.

  As shown in FIG. 10, it is preferable that the high compression portions 18 are discretely arranged in a zigzag shape or a lattice shape in a plan view. In order to arrange the high compression portions 18 in a zigzag or grid pattern, the convex portions 15 of the liquid-permeable surface sheet 3 are formed in a zigzag or grid plane pattern. It is particularly desirable to arrange the high compression portions 18 in a staggered manner. By arranging in a staggered pattern, the high compression portions 18 can be arranged at higher density, and the effect of increasing the rigidity of the concave groove 22 is increased, and the adjacent high compression portions 18 and 18 are in the groove longitudinal direction. Therefore, urine is easily diffused in the longitudinal direction of the groove. By disposing the high compression portion 18 in a staggered or grid-like plane pattern, the diffusibility of urine due to fiber density difference can be improved, the strength of the concave groove 22 is further increased, and the deformation of the concave groove 22 is further increased. It becomes difficult to occur.

  It is preferable that a plurality of the high compression portions 18 be arranged in the groove width direction of the concave groove 22. In the example shown in FIG. 10, the high compression portions 18 arranged in a staggered pattern are arranged in three rows in the groove width direction of the concave grooves 22. If one high compression part is provided across the groove width direction of the concave groove, urine absorbed in the liquid-permeable surface sheet is blocked by the high compression part and extends along the groove longitudinal direction. Urine diffusion is less likely to occur. On the other hand, when a plurality of high compression portions 18 are arranged in the groove width direction of the concave groove 22, the high compression portions 18 and the low compression portions 19 exist in the groove width direction. Therefore, the diffusion of urine along the longitudinal direction of the groove is not hindered.

  The low compression part 19 is provided around each high compression part 18, and the low compression parts 19 formed around the adjacent high compression part 18 are provided continuously. For this reason, the low compression portion 19 is continuously provided over the entire bottom surface of the concave groove 22.

  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 part of the longitudinal direction in the center part in the pad width direction corresponding to the urine discharge site H, but only one line is formed 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 from each other in the pad width direction, the even strips shown in FIG. 11 (A) or the odd strips shown in FIG. 11 (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 different groove widths as shown in FIG. Also good. In FIG. 12A, a widened portion 22a with 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 dripped 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. 12B, or may be provided at the front and rear end portions as shown in FIG. 12C.

  The concave groove 22 may be provided with one or a plurality of branch portions 22b and 22c as shown in FIG. 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. 13A to 13C, as the branching portion 22b, the front side, the rear side, or the front side and the rear side in the pad longitudinal direction extend outward from both side edges of the groove 22, 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. 13D to 13F, 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. 14, 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.

  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 elastic elastic member, 15 ... Convex part, 16 ... Concave part, 18 ... High compression part, 19 ... Low compression part, 20 ... Absorber concave part, 21 ... Embossed part, 22 ... Ditch

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 large number of convex portions having a relatively high basis weight, and concave portions that are formed around the convex portion and have a relatively low basis weight.
In the state where the concave groove is formed, the bottom of the concave groove is formed in a flat planar shape, and a plurality of high-compression portions in which the convex portions of the liquid-permeable surface sheet are compressed, and the liquid-permeable surface An absorbent article, wherein a concave portion of a sheet is compressed to form a low compression portion having a density lower than that of the high compression portion.   The absorptive article according to claim 1 in which said high compression part is arranged in a zigzag form or a lattice form by plane view.   The said liquid-permeable surface sheet consists of a laminated structure of the upper layer arrange | positioned at the skin side, and the lower layer arrange | positioned at the absorber side, The said lower layer consists of a nonwoven fabric containing a heat-shrinkable fiber. Absorbent article according to crab.   The absorption according to any one of claims 1 to 3, wherein a plurality of the high compression portions are arranged in the groove width direction of the groove, and the low compression portions are continuously provided over the entire bottom surface of the groove. Sex goods.

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