JP6081422B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article mainly used for incontinence pads, disposable diapers and the like, and has at least one groove for inflow of urine formed along the longitudinal direction on the skin side surface. About.

  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 proposals have been made in which concave grooves are formed in the longitudinal direction on the surface side.

  For example, in the following Patent Document 1, an absorbent article including a top sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and an absorbent layer interposed between both sheets, The layer is formed by laminating an upper absorbent layer and a lower absorbent layer having different areas, and a step is formed in the absorbent layer, and a recess extending integrally with the topsheet and the absorbent layer in the longitudinal direction of the absorbent article. An absorbent article in which is formed is disclosed.

JP 2008-173247 A

  Since the recess formed in the absorbent article described in Patent Document 1 is a recess that is relatively narrow and formed along the longitudinal direction, when the amount of urine is small, the diffusion / absorption of urine However, when a large amount of urine was discharged at one time, there was a concern that the amount of urine flowing into the recess was small and could leak along the surface. Moreover, since the said recessed part is formed in the thin width | variety, if an absorbent article has shifted | deviated even a little during mounting | wearing, it will shift | deviate from the discharge part of a body and urine will not be discharged | emitted directly into a recessed part. The urine is discharged outside. As a result, urine diffuses in the central direction and the outward direction, and the urine that flows in the outward direction sometimes causes side leakage.

  Therefore, the main problem of the present invention is that an absorber is interposed between the liquid surface sheet and the back sheet, and at least one groove for inflow of urine is formed along the longitudinal direction on the skin side surface. In the absorbent article, the flow direction is controlled so that the discharged urine is transmitted to the concave groove side even if the absorbent article is laterally shifted during wearing, and the storage volume of the concave groove is increased. Accordingly, an object of the present invention is to provide an absorbent article in which urine is quickly absorbed by an absorbent body without causing side leakage.

In order to solve the above-mentioned problems, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and at least one strip along the longitudinal direction on the skin side surface. In the absorbent article in which the concave groove for urine inflow was formed,
The cross-sectional shape of the concave groove satisfies the following conditional expressions (1) to (3),
(1) When the depth of the bottom surface of the concave groove is h, the relationship with the distance S from the bottom edge G of the concave groove to the upper edge K where the concave groove starts is 1.5h <S. .
(2) When the bottom width of the concave groove is b, the bottom width b of the concave groove is 5 to 30 mm, and the liquid collection is represented by the distance between the upper edges K and K on both sides across the concave groove. The relationship with the area width B is B ≧ 3b.
(3) When the area when the groove represented by the product of the bottom face width b and the bottom face depth h of the groove is a rectangular groove is a, the relationship with the cross-sectional area A of the groove is A ≧ 2a.

  In addition, an absorbent article is provided in which the concave groove has an absorbent density ρ1 at the bottom that is 1.5 times or more the density ρ2 of the peripheral general absorbent body that has not been compressed.

  The invention described in claim 1 is characterized by the cross-sectional shape of the groove. Specifically, the groove cross section satisfies the conditional expressions (1) to (3).

  First, the first conditional expression (1) indicates that the width B of the collecting area in which the drainage urine flows to the bottom side of the groove is defined as the depth h of the groove. It is specified in relation to. Specifically, when the depth of the bottom surface of the concave groove is h, the relationship with the distance S from the bottom edge G of the concave groove to the upper edge K where the concave groove starts is 1.5h <S. If there is, the liquid collection area width becomes 2S + b, and even if the absorbent article is laterally shifted during wearing, as long as the urine drainage part of the body is located within the liquid collection area width B, the discharged urine will be discharged. It is possible to control the flow direction so as to flow along the bottom of the concave groove.

Next, the second conditional expression (2) is the same, and the width B of the liquid collection area is defined in relation to the bottom surface width b of the groove. Specifically, when the bottom surface width of the concave groove is b, the bottom surface width b of the concave groove is 5 to 30 mm, and is expressed by the distance between the upper edges K on both sides across the concave groove. If the relation with the width B of the liquid collection area is B ≧ 3b, a sufficient width can be secured as the width of the liquid collection area, and even if the absorbent article is laterally displaced during wearing, the discharged urine is recessed It is possible to control the flow direction so as to flow to the side.

  Furthermore, the third conditional expression (3) defines the storage cross-sectional area A of the concave groove in relation to the storage cross-sectional area a when the concave groove is formed in a rectangular shape. Specifically, the relationship between the groove area represented by the product of the bottom surface width b and the bottom surface depth h of the groove is a rectangular groove, and the relationship with the sectional area A of the groove. When A ≧ 2a, it is possible to secure a sufficient volume as the storage volume of the concave groove, and even when a large amount of urine is discharged at once, the urine is once stored in the concave groove. Then, it becomes possible to quickly absorb the absorbent body.

  In the present invention, the concave groove is further conditioned on the condition that the absorber density ρ1 at the bottom is 1.5 times or more the density ρ2 of the peripheral general absorber not subjected to pressing. Therefore, since the absorptivity density of the absorber bottom is higher than the others, urine can quickly flow to the groove bottom side and be absorbed by the absorber.

As the present invention according to claim 2, absorber basis weight β1 before Symbol groove bottom, the absorbent article according to claim 1, wherein 55% or less of the mass per unit area β2 general portion absorber around not receiving compressed Provided.

Invention of the second aspect, the absorber basis weight β1 before Symbol groove bottom, it is an 55% or less of the mass per unit area β2 general portion absorber around not receiving compressed. The absorbent body recess, protrusion of the bottom during urine absorbent is suppressed extremely small so after urine absorbed state of the groove can be maintained.

  As this invention which concerns on Claim 3, the said absorbent article is equipped with the solid gathers in the both sides by the side of a skin surface, respectively, and the width B of the said liquid collection area is set to W in the standing inside end dimension of a solid gather. The absorbent article according to any one of claims 1 and 2, which is 1/3 or more of a dimension W inside the standing end of the three-dimensional gather.

  In the invention according to the third aspect, the width B of the liquid collection area is defined in relation to the internal dimension W of the standing end of the three-dimensional gather. Specifically, the width B of the liquid collection area is set to 1/3 or more of the dimension W within the standing end of the three-dimensional gather. By forming the width B of the liquid collection area with a width that is 1/3 or more of the inner end dimension W of the three-dimensional gather, which is the width that can absorb urine, a large part of the discharged urine is recessed more effectively. It can flow into the groove and be absorbed by the absorber.

As the present invention according to claim 4, the absorbent article according to any one of claims 1 to 3 longitudinal length of the groove is 100~180mm is provided.

Invention of the fourth aspect is obtained by defining a longitudinal length of the groove. Specifically, the longitudinal length of the groove is desirably a 100～180Mm.

  As described above in detail, according to the present invention, the flow direction is controlled so that the discharged urine is transmitted to the groove side even when the absorbent article is laterally displaced during wearing, and the storage volume of the groove is increased. As a result, it is possible to provide an absorbent article in which the urine is quickly absorbed by the absorbent body without causing side leakage.

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. 3 is a cross-sectional view schematically showing a cross-sectional shape of a concave groove 22. FIG. FIG. 4 is a cross-sectional view of the absorber 4. 3 is an enlarged plan view of a concave groove 22. FIG. (A) of the concave groove 22 is before deformation and (B) is after deformation, and is a view taken along the line VII-VII in FIG. It is sectional drawing which shows the embossing convex part of an embossing roll. It is an enlarged plan view of the groove 22 according to another embodiment. It is an enlarged plan view of the groove 22 according to another embodiment. It is an enlarged plan view of a ditch | groove when only the 1st embossing 24 is used. FIG. 12 is a view taken along the line XII-XII in FIG. 11, showing (A) of the groove before deformation and (B) after deformation. (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.

  Hereinafter, embodiments (incontinence pads) 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. An absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3 and a hydrophilic substance disposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as necessary. A pair of left and right three-dimensional bodies provided on the skin side in a predetermined section in the longitudinal direction so that the second sheet 6 and the substantially lateral edge of the absorbent body 4 are standing base ends and include at least the urine discharge site H Gather BS, mainly composed of side nonwoven fabrics 7 and 7 forming BS, and around the absorbent body 4, the liquid-impervious back sheet 2 and the liquid-permeable top sheet at the longitudinal edge thereof The outer edge with 3 is hot melt The liquid-impermeable back sheet 2 and the side nonwoven fabric 7 that are joined by any adhesive or adhesive means such as heat seal and that extend laterally from the absorbent body 4 at both side edges thereof are hot-melted. It is joined by adhesive means such as adhesive or heat seal. The absorber 4 can be surrounded by an encapsulating sheet (not shown) such as crepe paper or non-woven fabric in order to maintain the shape and improve the diffusibility.

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, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. 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. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.

  The absorbent body 4 is composed of, for example, absorbent fibers such as fluffy pulp and the superabsorbent 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. Although not shown, when the absorbent body 4 is surrounded by the encapsulating sheet, the encapsulating sheet is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result, and the above-described excellent absorbency is achieved. The urine is quickly diffused by the encapsulating sheet and the urine is prevented from returning. The pulp basis weight (general portion that is not compressed (.beta.2)) ^{is, 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. The water-absorbing polymer having the water-absorbing performance can be adjusted in water absorption (absorption capacity) and water absorption speed by adjusting the crosslinking density and the crosslinking density gradient in the production process. Basis weight of the ^{polymer, 150g / m 2 ~500g / m} 2, and it is preferably a ^{200g / m 2 ~450g / m 2} .

  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 second sheet 6 only needs to be hydrophilic to urine. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used. Further, the second sheet 6 may have a porous film layer on the back surface side (absorbent body 4) in order to give elasticity, and may be a laminated sheet with an encapsulating sheet. You may use the raw material to contain.

  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.

[Concave groove 22]
In the incontinence pad 1 according to the present embodiment, one groove 22 for inflow of urine is formed along the longitudinal direction on the surface side (skin surface 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. To 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 advance, and the embossed portion 21 is provided along the absorbent body recess 20 to squeeze the constituent members that are higher than the absorbent body 4 from the surface side (skin surface side) of the liquid-permeable surface sheet 3. What was formed by this is desirable for the reason that deformation of the concave groove 22 due to leg pressure can be prevented.

  Before the embossed portion 21 is formed, the absorbent body 4 is previously formed with an absorbent recess 20 that is formed in a concave groove shape or a slit shape without being compressed, and in the illustrated example, a concave groove shape. For example, as shown in FIG. 5, the absorbent body recess 20 is not compressed, and (A) stacked fiber, or (B) the lower layer absorbent body 4 a formed with the thickness of the bottom of the absorbent body recess 20, 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. 13 to 13). FIG. 15). 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 180 mm and the groove width (bottom groove width) is 5 to 30 mm. In the case where the concave groove 22 is formed after the absorber concave portion 20 is provided in advance, the depth of the absorber concave portion 20 before the embossed portion 21 is provided is 45% or more of the thickness of the general portion absorber 4, specifically In particular, the thickness is preferably about 5 to 8 mm.

The basis weight β1 (excluding the polymer) of the absorbent body 4 interposed in the bottom of the absorbent body recess 20 before providing the embossed portion 21 (part on the liquid-impermeable back sheet 2 side, non-skin side part) is 70 g. / ^{m 2} ~280g / ^m 2, preferably better to the ^{90g / m 2 ~260g / m 2} , 55% of the weight of the general portion absorber not receiving compressed .beta.2 (not including polymers) or less, preferably It is desirable that it is 40 to 55%. Also, the basis weight of the water-absorbing polymer 8 in this ^{portion, 0g / m 2 ~270g / m} 2, and it is preferably a ^{0g / m 2 ~35g / m 2} .

  The planar dimension when the embossed part 21 is provided may be larger or smaller than the dimension of the absorber recess 20. On the bottom surface of the embossed portion 21, a high-pressure squeezed portion 23 squeezed deeper than the bottom surface of the peripheral concave groove 22 is formed in an appropriate pattern. The pattern of the high pressure part 23 will be described later.

<Cross-sectional shape of the concave groove 22>
In the incontinence pad 1 according to the present embodiment example, the cross-sectional shape of the concave groove 22 increases the range that promotes the inflow into the concave groove 22, so that even if the incontinence pad 1 is laterally shifted during mounting, the incontinence pad 1 is discharged The flow direction is controlled so as to flow along the concave groove 22 side, and the storage volume of the concave groove 22 is increased, so that the absorbent body 4 can quickly absorb the urine without causing side leakage. ing.

Specifically, the cross sectional shape of the concave groove 22 satisfies the following conditional expressions (1) to (3) when described with reference to the cross sectional view shown in FIG.
(1) When the depth of the bottom surface of the concave groove 22 is h, the relationship between the distance S from the bottom edge G of the concave groove 22 to the upper edge K where the concave groove 22 begins to be depressed is 1.5h <S (First conditional expression).
(2) When the bottom surface width of the concave groove 22 is b, the relation with the width B of the liquid collection area expressed by the distance between the upper edges K on both sides across the concave groove 22 is B ≧ 3b. Be (second conditional expression).
(3) When the area when the concave groove 22 represented by the product of the bottom face width b and the bottom face depth h of the concave groove 22 is a rectangular groove is a, the sectional area A of the concave groove 22 The relationship is A ≧ 2a (third conditional expression).

  In the first conditional expression (1), the width (B) of the collection area in which the drained urine flows to the bottom side of the groove 22 is defined as the groove 22. It is defined in relation to the depth h of In many conventional absorbent articles, the urine inflow recesses are formed with a relatively narrow width. However, when a large amount of urine is discharged at one time, the amount of urine flowing into the recesses is small and is transmitted across the surface. There is a risk of leakage, and if the absorbent article is slightly displaced during wearing, it will be displaced from the body's discharge site and urine will not be discharged directly into the recess, but will be discharged outside the recess. However, in the case of the incontinence pad 1, the width of the upper opening of the concave groove 22 is considerably widened in the width direction. Specifically, when the depth of the bottom surface of the concave groove 22 is h, the relationship with the distance S from the bottom edge G of the concave groove 22 to the upper edge K where the concave groove 22 begins to be depressed is 1.5 h. <S, preferably 2h <S, the liquid collection area width B is 2S + b, and even if the incontinence pad 1 is laterally displaced during wearing, the body's urine drainage portion is within the liquid collection area width B. As long as it is located, the flow direction can be controlled so that the discharged urine flows along the bottom side of the groove 22. The depth h of the bottom surface of the concave groove 22 (depth to a position other than the high pressing portion 23) is 3 to 20 mm, preferably 7 to 9 mm.

  The bottom edge G of the concave groove 22 to the upper edge K where the concave groove 22 starts to be depressed can be an arcuate inclined surface (illustrated example) or a linear inclined surface slightly protruding outward.

  The second conditional expression (2) defines the width B of the liquid collection area in relation to the bottom surface width b of the groove. If the depth h is small only by the first conditional expression (1), a sufficient liquid collection area width B cannot be secured. Therefore, in addition to the first conditional expression (1), the second conditional expression (2) The dimension of the liquid area width B is defined. Specifically, when the bottom surface width of the groove 22 is b, the relationship with the width B of the liquid collection area expressed by the distance between the upper edges K on both sides across the groove 22 is B ≧ When 3b, preferably B ≧ 4b, a sufficient width can be secured as the liquid collection area width B, and even if the incontinence pad 1 is laterally shifted during wearing, the body urine drainage portion is not disposed in the liquid collection area width. As long as it is located within B, the flow direction can be controlled so that the discharged urine flows along the bottom side of the groove 22. As described above, the bottom width b of the concave groove 22 is preferably 5 to 30 mm, more preferably 10 to 20 mm.

  The third conditional expression (3) is obtained when the concave groove 22 is formed in a rectangular shape so that the storage cross-sectional area A of the concave groove 22 can be accommodated in the concave groove 22 even when a large amount of urine is discharged at once. This is defined in relation to the storage cross-sectional area a. Specifically, the cross-sectional area A of the concave groove 22 is defined as a when the concave groove 22 represented by the product of the bottom surface width b and the bottom surface depth h of the concave groove 22 is a rectangular groove. When A ≧ 2a, it is possible to secure a sufficient volume as the storage volume of the groove 22, and even when a large amount of urine is discharged at once, the urine is stored in the groove 22. After being accommodated once, it can be quickly diffused and absorbed by the absorber 4.

Furthermore, in order to allow the urine to flow quickly to the bottom side of the concave groove 22 in the concave groove 22, the concave groove 22 has a general structure around the periphery where the absorber density (excluding polymer) ρ1 of the bottom is not squeezed. The condition is that the density of the partial absorber (not including the polymer) ρ2 is 1.5 times or more, preferably 1.7 times or more. The relative difference in the absorber density can be provided by forming the embossed portion 21 with respect to the bottom of the concave groove 22 or forming a high-pressure portion 23 described later. By providing such a density difference of the absorber, urine can quickly flow to the bottom side of the groove 22 and be absorbed by the absorber 4. The absorber density ρ1 at the bottom of the concave groove 22 is 0.060 to 0.150 g / cm ³ , preferably 0.070 to 0.140 g / cm ^3. ρ2 is 0.020 to 0.070 g / cm ³ , preferably 0.030 to 0.060 g / cm ³ .

  Furthermore, when the inside dimension of the standing end of the three-dimensional gather BS is W, the width B of the liquid collection area is 1/3 or more, preferably 1/2 or more of the inside dimension W of the three-dimensional gather BS. Is desirable. By forming the width B of the liquid collection area with a width of 1/3 or more with respect to the inner dimension W of the standing end of the three-dimensional gather BS, which is the width that can absorb urine, much of the urine discharged more effectively It becomes possible to flow into the concave groove 22 and to be absorbed by the absorber 4.

<High pressure squeezed part 23 of the concave groove 22>
Hereinafter, the said high pressing part 23 is demonstrated. The high-pressure portion 23 is a portion that is squeezed deeper than the bottom surface of the peripheral concave groove 22, and is formed in a predetermined pattern on the bottom surface of the concave groove 22. Specifically, as shown in FIG. 6, the high-pressure portion 23 extends in the groove width direction and inclines in the groove longitudinal direction in a unit section 26 in which the concave groove 22 is partitioned in the longitudinal direction in a plan view. The concave groove 22 is formed so as to cross from one side end to the other side end, and the unit section 26 is repeatedly reversed in the longitudinal direction of the groove, along the concave groove 22 as a whole. Wave-shaped first embosses 24 formed in a pattern in which concaves and convexes are repeated on both sides in the width direction so as to reciprocate both side edges of the groove 22; It is comprised from the 2nd embossing 25 formed along the said ditch | groove 22 in the side edge part of the said ditch | groove 22 of the opposite opposite side.

  The wavy first emboss 24 is formed in a wavy shape such as a wavy curve that repeats reciprocating between one side edge 22a and the other side edge 22b of the concave groove 22, a zigzag line (see FIG. 9). It consists of continuous lines. The corrugated first emboss 24 is provided with alternately and repeatedly convex portions 24a projecting toward one side edge 22a and projecting portions 24b projecting toward the other side edge 22b. The wavy first emboss 24 is formed so as to extend in the same direction in the longitudinal direction of the groove without crossing or connecting one emboss line. Therefore, a closed region surrounded by the emboss line is not provided on the bottom surface of the concave groove 22.

  The wavy first emboss 24 is preferably formed over the entire width of the groove 22. That is, the first emboss 24 is configured so that the tops of the convex portions 24 a and 24 b coincide with or are close to the side edges 22 a and 22 b of the concave groove 22. Thereby, the concave groove 22 can be reinforced over the entire width, and the collapse of the concave groove 22 due to pressure from both sides in the width direction can be surely prevented. The term “adjacent” means that the tops of the convex portions 24a and 24b are arranged in the range of 2 mm or less, preferably 1 mm or less, inside the side edges 22a and 22b of the groove 22.

  As shown in FIG. 6, the wavy first emboss 24 is preferably formed in a rounded curved shape that bulges outward in the width direction. Thereby, it becomes possible to reliably prevent crushing due to pressure from the outside. The wavy first emboss 24 is preferably formed in a sine wave shape as a whole, but may be formed by a pattern in which semicircular arcs are alternately reversed and continued.

  The distance T between the adjacent convex portions 24a, 24a in the same direction of the corrugated first emboss 24 (period of the corrugated first emboss 24) is 16 mm to 25 mm, preferably 18 mm to 22 mm. Thereby, while being able to reinforce the ditch | groove 22 reliably, the wrinkles of a surface material, a twist, and a tear can be prevented, and operativity improves. The wavy first emboss 24 is formed at substantially the same distance T over the entire length of the concave groove 22 (formed with substantially the same period).

  On the other hand, the second emboss 25 is a plurality of embosses formed in a continuous line shape along the groove longitudinal direction of the concave groove 22 in a predetermined range. The fact that the second emboss 25 is formed along the concave groove 22 means that a straight line connecting the end portions of the emboss is substantially along the groove longitudinal direction of the concave groove 22, and this straight line is parallel to the groove longitudinal direction line. In addition to the above case, those having an angle difference of up to about ± 20 ° with respect to the groove longitudinal direction line are also included. Further, the line along the longitudinal direction does not need to be a straight line, and can be formed by a curved line, a broken line, a wavy line, or the like.

  The second emboss 25 is formed at the side edge of the concave groove 22 on the opposite side of the convex portions 24a, 24b from which the wave-shaped first emboss 24 projects outward in the width direction. That is, in the convex part 24a protruding toward the one side edge 22a of the concave groove 22, the second emboss 25 is formed along the other side edge 22b on the opposite side, and the other side edge of the concave groove 22 is formed. In the convex part 24b which protrudes toward 22b, the 2nd emboss 25 is formed along one side edge 22a on the opposite side.

  The second embossing 25 is provided such that the outer edge portion coincides with or is close to the side edge 22 a or 22 b of the concave groove 22. The term “adjacent” means that the outer edge of the second emboss 25 is arranged in the range of 2 mm or less, preferably 1 mm or less, inside the side edges 22 a and 22 b of the groove 22. As a result, similar to the wavy first emboss 24, the concave groove 22 can be reinforced over a wide range in the width direction.

  The wavy first emboss 24 is provided so as to reciprocate on both side edges 22a, 22b of the groove 22, and the second emboss 25 is provided on the side edges 22a, 22b of the groove 22, thereby 24 and the 2nd emboss 25 are arrange | positioned so that it may overlap with respect to a groove | channel longitudinal direction. Thereby, the said wavy 1st embossing 24 and the 2nd embossing 25 are made to provide resistance with respect to the leg pressure from the width direction outer side in the equivalent position with respect to the groove width direction.

  The second emboss 25 is preferably formed by a straight line along the groove longitudinal direction of the groove 22 within a predetermined range in which the wavy first emboss 24 becomes a recess. Accordingly, since the second emboss 25 is provided along the side edge of the concave groove 22, a wider range of reinforcement is possible with respect to the pressure from the outer side on the side where the second emboss 25 is provided. .

  The second emboss 25 is provided at a position where the central portion in the groove longitudinal direction coincides with the top of each convex portion 24a, 24b of the wavy first emboss 24 in the groove width direction. That is, when a groove width direction line is drawn at the top of each convex portion 24a, 24b of the wavy first emboss 24, the groove length direction line is used as a boundary to form the same length on both sides in the groove longitudinal direction. Yes.

  Moreover, in this incontinence pad 1, the said 1st embossing 24 of a wave form and the 2nd embossing 25 are not connected, but each embossing line is spaced apart so that it may become independent. For this reason, the high pressing portion 23 is formed with one first emboss 24 that is continuous along the concave groove 22, and each of the second embosses 25 at a portion that becomes a concave portion of the wavy first emboss 24. Is arranged. That is, a plurality of the second embosses 25 are provided at a predetermined position with respect to the concave groove 22.

  As shown in FIG. 6, the separation width C between the wavy first emboss 24 and the second emboss 25 is the portion where the linear distance between the two embosses is the shortest, and is preferably 2 mm or more and 5 mm or less ( 2 mm ≦ C ≦ 5 mm). When the separation width C is smaller than 2 mm, the pressure at the time of embossing is not easily dispersed and wrinkles or the like are likely to occur, and paper powder or the like easily enters the gap portion of the embossing roll and becomes clogged. On the other hand, when the separation width C is larger than 5 mm, the strength of the concave portion of the wave-like first emboss 24 cannot be sufficiently reinforced, and the concave groove 22 is easily crushed.

  As described in detail above, in the incontinence pad 1, the high-pressure squeezed portion 23 composed of the wavy first emboss 24 and the second emboss 25 is formed on the bottom surface of the groove 22. Temporarily, when a high pressing part is comprised only with the said wavy 1st embossing 24, as shown in FIG.11 and FIG.12, in the recessed part in which the said wavy embossing is not formed, the resistance force with respect to the leg pressure from the width direction outer side Therefore, the ditch is crushed, the urine storage capacity of the ditch is reduced, and urine is hardly absorbed by the absorber. On the other hand, in the incontinence pad 1, as shown in FIG. 7, the second emboss 25 is provided in a portion corresponding to the concave portion of the wavy first emboss 24. The resistance force against the pressure is increased, and the concave groove 22 is not easily crushed.

  Moreover, in this incontinence pad 1, the said 1st embossing 24 of a wave form and the 2nd embossing 25 are not connected, but each embossing line is spaced apart so that it may become independent. For this reason, the area | region enclosed by the high pressing part 23 following the bottom face of the ditch | groove 22 is not formed. Therefore, when embossing, the space between the embosses becomes the escape route of the squeezing force and the pressure is dispersed, so that the distortion of the surface material due to the squeezing does not accumulate, the surface material is broken and the embossing roll is clogged Etc. will not occur, and operability will be improved.

  By the way, in this incontinence pad 1, in order to prevent tearing of the surface material at the time of processing the high-pressure squeezed part 23, the basis weight of the superabsorbent polymer 8 disposed at the bottom of the absorbent body recess 20 of the absorbent body 4 is set in another region. It is preferable to make it smaller than the basis weight. If a large amount of the superabsorbent polymer 8 is arranged in this region, the surface material is easily broken by the superabsorbent polymer 8, and therefore the risk of breakage during embossing is reduced by reducing the amount of polymer.

  Moreover, when giving the said high pressing part 23, what provided the embossing convex part of the predetermined pattern in the embossing roll is used, but as FIG. 8 shows, the embossing convex part of an embossing roll is a tip. It is preferable to use a corner portion subjected to R treatment. Thereby, the tear of the liquid-permeable surface sheet 3 can be surely prevented as compared with a corner portion not subjected to the R treatment or a chamfered C treatment.

  Further, the groove widths and depths of the wavy first emboss 24 and second emboss 25 may be different, but they are made the same so as to generate an even resistance against pressure from both sides in the width direction. Is desirable.

  The concave groove 22 can be arranged in various forms. As shown in FIG. 1, the concave groove 22 is preferably formed at the center of the pad width direction corresponding to the urine discharge site H and only in the middle in the longitudinal direction. 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 forming a plurality of strips separated in the pad width direction, the even strips shown in FIG. 13 (A) or the odd strips shown in FIG. 13 (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 with a different groove width as shown in FIG. Also good. In FIG. 14 (A), 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 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. 14 (B), or may be provided at the front and rear end portions as shown in FIG. 14 (C).

  As shown in FIG. 15, 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. 15A to 15C, as the branching portion 22b, the front side, the rear side, or the front side and the rear side in the longitudinal direction of the pad extend outward from both side edges of the concave 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. 15D to 15F, 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 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.

[Other examples]
(1) The wavy first emboss 24 extends in the groove width direction and inclines in the groove longitudinal direction in the unit section 26 in which the concave groove 22 is partitioned in the longitudinal direction, and is on one side end of the concave groove 22. If the unit section 26 is formed in a pattern in which the unit section 26 is repeatedly positively inverted in the groove longitudinal direction, as shown in FIG. 9, the protrusion protruding outward in the width direction is formed. The parts 24a and 24b may be formed in a triangular shape, a trapezoidal shape, or a rectangular shape.
(2) If the second emboss 25 is formed along the concave groove 22, as shown in FIG. 10, the planar shape is formed by a graphic pattern such as (A) semicircle or (B) triangle. May be. Further, as shown in FIG. 10A, when the wavy first emboss 24 is formed with a curve, the second emboss 25 is formed with a semicircular pattern in which the outline of the emboss is a curve in accordance with this curve. As shown in FIG. 10 (B), when the wavy first emboss 24 is formed by a straight zigzag line, the second emboss 25 has an embossed outline in accordance with the zigzag line. It is preferable to form with a triangular pattern that is a straight line.

  DESCRIPTION OF SYMBOLS 1 ... Incontinence pad, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 7 ... Side nonwoven fabric, 8 ... Super absorbent polymer, 10 ... Inside solid gather, 11 ... Outside solid gather , 12... ... thread-like elastic elastic member, 20 ... absorber recess, 21 ... embossed part, 22 ... recessed groove, 23 ... high-pressure part, 24 ... first embossed, 25 ... second embossed, 26 ... unit section

Claims (4)

In an absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and at least one groove for inflow of urine is formed along the longitudinal direction on the skin side surface,
The cross-sectional shape of the concave groove satisfies the following conditional expressions (1) to (3),
(1) When the depth of the bottom surface of the concave groove is h, the relationship with the distance S from the bottom edge G of the concave groove to the upper edge K where the concave groove starts is 1.5h <S. .
(2) When the bottom width of the concave groove is b, the bottom width b of the concave groove is 5 to 30 mm, and the liquid collection is represented by the distance between the upper edges K and K on both sides across the concave groove. The relationship with the area width B is B ≧ 3b.
(3) When the area when the groove represented by the product of the bottom face width b and the bottom face depth h of the groove is a rectangular groove is a, the relationship with the cross-sectional area A of the groove is A ≧ 2a.
And the said recessed groove is 1.5 times or more of the density (rho) 2 of the surrounding general part absorber which the absorber density (rho) 1 of a bottom part does not receive pressing, The absorbent article characterized by the above-mentioned. Before Symbol absorber basis weight β1 groove bottom absorbent article of claim 1 wherein 55% or less of the mass per unit area β2 general portion absorber around not receiving compressed.   The absorbent article includes three-dimensional gathers on both sides of the skin surface side, and when the dimension of the standing end of the three-dimensional gather is W, the width B of the liquid collection area is the dimension of the standing end of the three-dimensional gather. The absorbent article according to claim 1, which is 1/3 or more of W. The absorbent article according to any one of claims 1 to 3 longitudinal length of the groove is 100～180Mm.

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