JP6033612B2 - Absorber and absorbent article using the same - Google Patents

Description

  The present invention relates to an absorbent used for absorbent articles such as incontinence pads, panty liners, sanitary napkins, etc. for absorbing body fluids such as urine and menstrual blood. The present invention relates to an absorbent body capable of containing a resin and an absorbent article using the same.

  2. Description of the Related Art Conventionally, in absorbent articles such as incontinence pads, an absorbent article in which a highly water-absorbent resin is dispersed and mixed in a water-absorbent fiber is known. A highly water-absorbent resin has properties such that when it comes into contact with moisture such as urine, it absorbs and swells to form a gel, and once it absorbs water, it does not release even if a certain pressure is applied. Moreover, the highly water-absorbent resin has an amazing water absorption capacity that is several times its own volume.

  In particular, light incontinence pads are required to be small and thin in consideration of handling convenience and wearing feeling, etc., but even in this case, a superabsorbent resin is absorbed in the absorber so that a certain amount of urine can be absorbed. Is densely mixed. Therefore, when the absorber is thinned to a desired level, for example, to a thickness of about 2.0 mm, the content ratio of the superabsorbent resin becomes relatively high, and the superabsorbent resin absorbs water and swells. Adjacent to each other, the superabsorbent resins adjoining each other cause so-called “gel blocking”, and eventually there is a problem that a desired water absorbing power cannot be expressed. Moreover, when the content ratio of the fibers is relatively lowered by increasing the content ratio of the superabsorbent resin, there arises a problem that the absorbent body is liable to be slid or easily broken.

  As an absorbent body having such a highly water-absorbent resin, in Patent Document 1 below, a water-absorbent sheet having a crepe has an intermediate layer formed with a large number of recesses, a water-absorbent resin accommodated in the recesses, and the water-absorbent resin. Disclosed is an absorbent sheet having a first outer layer overlaid on the middle layer so as to close the opening side of a recess in which is housed, and a second outer layer overlaid on the middle layer on the opposite side of the first outer layer Has been.

  Moreover, in the following patent document 2, an absorbent laminate has a first absorbent layer and a second absorbent layer in this order from the top sheet side, and the second absorbent layer comprises a water absorbent resin and / or pulp fibers. And the first absorbent layer discloses an absorbent article having a water-absorbing resin between nonwoven fabric sheets and having no pulp fibers.

  Furthermore, Patent Document 3 below discloses an absorbent article having interspersed portions where superabsorbent resins are densely packed in the absorber.

Japanese Patent Laid-Open No. 10-14978 JP 2011-136078 A JP 2009-173 A

  However, in the absorbent article described in Patent Documents 1 and 2, since the superabsorbent resin sandwiched between the nonwoven fabrics and the like is disposed almost entirely over the lower side of the liquid-permeable surface sheet, the absorbent article is repeatedly repeated several times. When there is urination, gel blocking is likely to occur due to the highly water-absorbent resin swollen by previous urination, and as a result, the area where urine is circulated on the lower layer side is reduced, resulting in leakage of urine on the product surface. There was a problem that made it easier.

  Moreover, in the absorptive article of the said patent document 3, although the gel blocking is prevented by providing the interspersed part of superabsorbent resin, this interspersed part was mixed with superabsorbent resin and pulp fiber. This is a portion where the basis weight of the pulp fiber in the scattered portion is lower than the basis weight of the pulp fiber outside the scattered portion. There has been concern about dropping from the weight of pulp fibers, and it has been difficult to stably dispose a large amount of superabsorbent resin in the interspersed area.

  Accordingly, the main problem of the present invention is that an absorbent body capable of stably containing a large amount of high water-absorbent resin in the absorbent body while maintaining the water absorption amount and the water absorption speed of the body fluid, and the absorptivity using the same. To provide an article.

In order to solve the above-mentioned problems, the present invention according to claim 1 is an absorbent body in which an upper layer absorber positioned on the skin contact surface side and a lower layer absorber positioned on the non-skin contact surface side are laminated. And
The lower layer absorber has a recess formed on the skin contact surface side, the super absorbent material is accommodated in the recess and the upper layer absorber is laminated so as to cover the opening of the recess, and the upper layer The superabsorbent resin is dispersed and arranged in the absorber and the lower absorber, and the basis weight of the superabsorbent resin dispersed and arranged in the upper absorber is more than the basis weight of the superabsorbent resin dispersed and arranged in the lower absorber. There is provided an absorbent body characterized by being set to be relatively small .

In the first aspect of the present invention, since the concave portion is formed on the skin contact surface side in the lower layer absorbent body, a highly water-absorbent resin is accommodated in the concave portion, and the upper layer absorbent body is laminated, the upper layer absorption The body fluid absorbed by the body is attracted to the recessed portion side of the lower layer absorbent body due to the fiber density difference of the embossed portion, and is efficiently absorbed and held by the superabsorbent resin accommodated in the recessed portion. Therefore, gel blocking by the highly water-absorbent resin can be prevented, so that the water absorption amount and the water absorption speed of the body fluid can be maintained.

  In addition, since the highly water-absorbent resin is accommodated in the embossed recess from the skin contact surface side of the lower layer absorbent body and the upper layer absorbent body is laminated on the upper surface side, the opening of the recessed portion is covered. Even when the highly water-absorbing resin is accommodated, it is possible to completely prevent the superabsorbent resin from falling off. Therefore, a large amount of superabsorbent resin can be stably contained in the absorber.

Further, a superabsorbent resin is dispersedly arranged in each of the upper layer absorber and the lower layer absorber, and the basis weight of the superabsorbent resin dispersed in the upper layer absorber is the superabsorbent polymer dispersedly arranged in the lower layer absorber. It is set relatively smaller than the basis weight of the resin .

In addition to the superabsorbent resin accommodated in the recess, the superabsorbent resin is dispersed and disposed in the pulp fibers of the upper layer absorber and the lower layer absorber, and the basis weight of the dispersed superabsorbent resin is determined in the upper layer absorber. Of basis weight ≦ weight of basis in the lower layer absorber. Thereby, a body fluid becomes easy to be absorbed and hold | maintained at the lower layer absorber side, and gel blocking when the highly water-absorbent resin in the upper layer absorber absorbs water and swells can be prevented.

As the present invention according to claim 2 , the concave portion is formed in an intermittent pattern having a spacing portion, a continuous pattern having a plurality of constricted portions with a narrow emboss width, or these absorber of claim 1 Symbol placement is formed by the combination is provided.

In the second aspect of the invention, the planar pattern of the recess formed in the lower layer absorber is defined, and specifically, an intermittent pattern, a continuous pattern having a plurality of constricted portions, or a combination thereof. In any of these patterns, the superabsorbent resin accommodated in the recesses is prevented from moving along the recesses. In the case of a continuous pattern, in particular, since the supply of the superabsorbent resin to the concave portion is continuous, the control for supplying the superabsorbent resin line becomes easy.

According to a third aspect of the present invention, there is provided the absorber according to any one of the first and second aspects, wherein a thickness of the upper layer absorber is set to be equal to or less than a thickness of the lower layer absorber.

In the invention according to the third aspect , the thickness of the upper absorbent body is reduced so that the body fluid can be easily transferred from the upper absorbent body to the lower absorbent body and can be quickly absorbed and retained in the superabsorbent resin accommodated in the recess. It is set below the thickness of the absorber.

As this invention which concerns on Claim 4 , the absorber of any one of Claims 1-3 by which the pulp density of the said lower layer absorber is set relatively larger than the pulp density of the said upper layer absorber is provided. .

In the invention according to claim 4, in order to facilitate transfer of the body fluid absorbed by the upper layer absorber to the lower layer absorber due to the difference in density of pulp fibers, the pulp density of the lower layer absorber is relative to the pulp density of the upper layer absorber. Is set to be large.

As this invention which concerns on Claim 5 , the intermediate | middle absorber of 1 layer or 2 layers or more is laminated | stacked between the said upper layer absorber and lower layer absorber, The skin contact surface side is provided in the at least 1 layer of the said intermediate absorber. recess is formed, absorbent body according to claim 1-4 or the superabsorbent polymer is contained in the recess is provided to.

In the invention according to the fifth aspect, an absorber having a laminated structure of three or more layers is defined, and a recess is formed in at least one layer of the intermediate absorber to accommodate the highly water-absorbent resin.

As the present invention according to claim 6 , in an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet,
An absorbent article using the absorbent according to any one of claims 1 to 5 as the absorbent is provided.

  As described above in detail, according to the present invention, a large amount of highly water-absorbent resin can be stably contained in the absorbent body while maintaining the water absorption amount and the water absorption speed of the body fluid.

It is a partially broken development view of the light incontinence pad 1 according to the present invention. It is the II-II arrow directional view. FIG. 4 is an exploded perspective view of the absorber 4. 3 is a cross-sectional view of the absorber 4. FIG. It is a top view of lower layer absorber 4B. It is a top view of lower layer absorber 4B concerning other forms. It is the plane pattern (the 1) of the recessed part 10. FIG. It is the plane pattern (the 2) of the recessed part 10. FIG. 2 is a cross-sectional view of a recess 10. FIG. It is a cross-sectional view of the absorber 4 which concerns on another form. It is process drawing (the 1) which shows the manufacture point of the absorber. It is process drawing (the 2) which shows the manufacture point of the absorber.

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

[Basic configuration of light incontinence pad 1]
As shown in FIGS. 1 and 2, the light incontinence pad 1 according to the present invention is provided between a liquid-impermeable back sheet 2 and a liquid-permeable surface sheet 3 (hereinafter also simply referred to as a surface sheet). As shown in the figure, the absorbent body 4 or the absorbent body 4 surrounded by the crepe paper 5 is interposed, and the three-dimensional gathers G and G are provided on both sides of the surface side.

  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, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the top sheet 3. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 includes an upper layer absorbent body 4A located on the skin contact surface side and a lower layer absorbent body located on the non-skin contact surface side. 4B is laminated, and these layers are joined together with an adhesive such as a hot melt adhesive as necessary. The absorber 4 will be described in more detail later.

  As shown in the figure, the absorbent body 4 is laminated with the upper-layer absorbent body 4A and the lower-layer absorbent body 4B in order to maintain the shape and to quickly diffuse urine and the like, and to prevent the urine etc. once absorbed from returning. It is desirable to surround the crepe paper 5 in a state.

  Side nonwoven fabrics 15 and 15 are provided on both sides of the surface side of the light incontinence pad 1 along the longitudinal direction and over the entire length of the light incontinence pad 1, and outer portions of the side nonwoven fabrics 15 and 15. The liquid-impermeable back sheet 2 is laterally extended, and the side nonwoven fabric 15 portion and the liquid-impervious back sheet 2 portion that are extended laterally are hot. Side flaps are formed by bonding with a melt adhesive or the like.

  As the side nonwoven fabric 15, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing the infiltration of urine and cages, or enhancing the feeling of touch, a water-repellent non-woven fabric coated with a silicon-based, paraffin-based, or alkylchromic chloride-based water repellent. If the emphasis is on the absorbability of body fluids, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, or stannic chloride Hydrophilic treated non-woven fabric that has been treated with a metal salt, made partially porous by dissolving the surface, making the synthetic fiber swelled or made porous by applying metal hydroxide, etc., and applying hydrophilicity by applying capillary action It is desirable to use As such a side nonwoven fabric 15, natural fibers, synthetic fibers, regenerated fibers, or the like, which are formed by an appropriate processing method can be used. Preferably, the fabric weight is reduced by suppressing the basis weight. Nonwoven fabric should be used.

  As shown in FIG. 2, the inner side of the side nonwoven fabric 15 folds the side nonwoven fabric 15 almost twice, and inside the double sheet, in the middle in the height direction, at both ends or in the longitudinal direction as appropriate. One or a plurality of, in the illustrated example, two thread-like elastic elastic members 16, 16 are disposed, and the double sheet portion is raised on the surface side by the contraction force. Is formed.

[Absorber 4]
As described above, the absorber 4 is composed of an upper layer absorber 4A and a lower layer absorber 4B as shown in FIG. In the absorbent body 4, a plurality of concave portions 10, 10... Are formed on the lower layer absorbent body 4 B by embossing from the skin contact surface side (surface sheet 3 side), and high water absorption is provided in the concave portions 10, 10. The upper absorbent body 4A is laminated in a state where the conductive resin 11 is accommodated.

  As a result, as shown in FIG. 4, the body fluid absorbed by the upper layer absorbent body 4 </ b> A moves to the lower layer side as it is in the portion where the lower layer side is the recess 10, and enters the superabsorbent resin 11 in the recess 10. Absorbed and held, and in other parts, after moving into the pulp fibers of the lower layer absorbent body 4B, the periphery of the recesses 10 is made into a high-density region squeezed by embossing, whereby the fiber density difference of this embossed part As a result, it is attracted to the concave portion 10 side and is efficiently absorbed and held by the highly water-absorbent resin 11 accommodated in the concave portion 10. Therefore, a gel with a highly water-absorbent resin produced when a layer of a highly water-absorbent resin is provided on the skin contact surface side of the absorbent body as in the past or when a large amount of a highly water-absorbent resin is dispersed and arranged in pulp fibers. Blocking can be prevented, and the amount of water absorbed and the rate of water absorption can be maintained.

  The superabsorbent resin 11 is accommodated in a recess 10 formed by embossing from the skin contact surface side (upper layer absorbent body 4A side, upper surface side) of the lower layer absorbent body 4B, and upper layer absorption is performed on the upper surface side. Since the opening of the recess 10 is covered with the upper absorbent body 4A by laminating the body 4A, even when a large amount of the superabsorbent resin 11 is accommodated in the recess 10, the superabsorbent resin 11 drops off. Can be completely prevented. In particular, since the pulp fibers are densified by embossing on the peripheral wall and bottom surface of the recess 10, dispersion of the superabsorbent resin around the recess 10 of the lower layer absorbent body 4 </ b> B can be completely prevented. Therefore, a large amount of the superabsorbent resin 11 can be stably contained in the absorber 4.

  Examples of the superabsorbent resin 11 include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked product, and 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 of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.

The amount of the superabsorbent resin 11 accommodated in the recess 10 is 0.05 to 15 g, preferably 0.1 to 10 g in total for the entire absorbent body. The volume of the recess 10 that can accommodate this amount of the superabsorbent resin 11 varies depending on the particle size of the superabsorbent resin 11, but the total of the absorber is 0.06 cm ^{3 to} 20 cm ³ , preferably 0.1 cm. ^{About 3 to} 12.5 cm ³ is required.

  The upper layer absorbent body 4A and the lower layer absorbent body 4B are formed in substantially the same planar shape, and the outer edges of both are substantially coincided with each other in the laminated state, and are formed in a substantially rectangular shape that is vertically long in the front-rear direction of the wearer, The surface other than the recess 10 is formed almost flat. The upper-layer absorber 4A is a flat-plate absorber whose front and back sides are substantially flat, and has no recess as in the lower-layer absorber 4B. If the upper absorbent body 4A is provided with a recess and a highly water-absorbent resin is disposed, gel blocking tends to occur and the penetration of body fluid is hindered. Moreover, although not shown in figure, in order to improve the adhesiveness to a crotch part on the skin contact surface side of the said upper layer absorber 4A, it is also possible to provide a high absorber middle-high part on the skin side in the center part in the width direction. is there. Such a middle-high portion of the absorbent body may be provided by being laminated on the skin contact surface side of the upper-layer absorbent body 4A, or may be formed by stacking the upper-layer absorbent body 4A.

  The upper layer absorbent body 4A and the lower layer absorbent body 4B may be made only of pulp. For example, the super absorbent polymer 12 is dispersed and arranged in the pulp, or chemical fibers are mixed in the pulp and the super absorbent polymer is absorbed. It is desirable to use the one in which the conductive resin 12 is dispersedly arranged. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten 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.

  Moreover, you may mix a synthetic fiber with each of the said upper layer absorber 4A and the lower layer absorber 4B. 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 a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  As the superabsorbent resin 12 dispersed and arranged in the pulp, the same superabsorbent resin 11 accommodated in the recess 10 can be used, for example, a polyacrylate cross-linked product, a self-crosslinked polyacrylic acid Salt, saponified acrylate-vinyl acetate copolymer cross-linked product, cross-linked isobutylene / maleic anhydride copolymer, cross-linked polysulfonate salt, water-swellable polymer such as polyethylene oxide, polyacrylamide, etc. And the like. Similarly, among these, those of acrylic acid or acrylate type that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.

Basis weight of the upper layer absorbent body 4A and a lower layer absorber 4B the total absorber whole ^{pulp, 90g / m 2 ~1000g / m} 2, and it is preferably a ^{100g / m 2 ~900g / m 2} . The weight of the entire absorbent body of the superabsorbent resin 11 accommodated in the recess 10 and the superabsorbent resin 12 dispersedly arranged in the pulp is 10 g / m ^{2 to} 500 g / m ² , preferably 15 g / m ^2. It is good to set it to -400 g / m < ² >. When the superabsorbent resin content is less than 10 g / m ² , sufficient absorbability cannot be provided, and when it exceeds 500 g / m ² , the entanglement between the pulp fibers disappears, and the sheet strength decreases. Breaking or cracking is likely to occur.

Here, as the upper layer absorbent body 4A and the lower layer absorbent body 4B, when the super absorbent polymer 12 dispersed in the pulp is used, the super absorbent polymer 12 dispersed in the upper absorbent body 4A is used. The basis weight is preferably set to be relatively smaller than the basis weight of the superabsorbent resin 12 dispersedly disposed in the lower layer absorbent body 4B. That is, the basis weight of the superabsorbent resin 12 of the upper layer absorbent body 4A ≦ the basis weight of the superabsorbent resin 12 of the lower layer absorbent body 4B. This makes it easier for urine and the like to be absorbed and held by the lower layer absorbent body 4B rather than the upper layer absorbent body 4A, and prevents gel blocking when the superabsorbent resin 12 in the upper layer absorbent body 4A absorbs water and swells. Specifically, preferably 10g / m ² ~200g / m ² as a weight per unit area of the superabsorbent polymer 12 of the upper layer absorbent body 4A, as the basis weight of the superabsorbent polymer 12 of the lower layer absorber 4B 30g / m ² ~400g / M ² is preferred.

  The thickness of the upper layer absorber 4A is preferably set to be equal to or less than the thickness of the lower layer absorber 4B. That is, the thickness of the upper layer absorber 4A ≦ the thickness of the lower layer absorber 4B. Thereby, the body fluid easily moves from the upper layer absorbent body 4 </ b> A to the lower layer absorbent body 4 </ b> B, and this body fluid can be quickly absorbed and held in the superabsorbent resin 11 accommodated in the recess 10. Specifically, the thickness of the upper absorbent body 4A is preferably 0.3 mm to 6 mm, and the thickness of the lower absorbent body 4B is preferably 0.5 mm to 10 mm.

  As shown in FIG. 5, the planar pattern of the recess 10 is preferably an intermittent pattern in which the recesses 10 and the spaced apart portions are alternately present along the longitudinal direction of the absorber 4. By providing such an intermittent pattern, the superabsorbent resin 11 accommodated in the concave portion 10 can be prevented from moving in the concave portion 10 and the bias of the superabsorbent resin 11 can be prevented, and a large amount of high absorbent resin can be stably added to the absorber. The water absorbent resin 11 can be contained. It is preferable that 1 to 5 intermittent pattern lines in the longitudinal direction are provided apart from each other in the width direction of the absorbent body. In the illustrated example, a total of 3 intermittent patterns in the longitudinal direction, one on each side in the width direction and on both sides thereof. A line is provided. In the illustrated example, the recesses 10 are arranged in a pattern that matches the width direction of the lower layer absorbent body 4B. However, the recesses 10 and the spaced-apart portions can be arranged in a staggered pattern in the width direction. .

  The dimensions of the concave portion 10 will be described. As shown in FIG. 5, the width A of the concave portion 10 is 3 mm to 20 mm, preferably 5 mm to 15 mm. For example, when a plurality of longitudinal direction intermittent pattern lines are provided in the width direction, the width dimension of the recesses 10 of the intermittent pattern lines arranged in the center part in the width direction is widened to increase the capacity of the superabsorbent resin 11. As described above, the width dimension may be changed in units of the longitudinal intermittent pattern line, or the width dimension in the vicinity of the central portion of the absorbent body 4 corresponding to the urination port may be increased so that the width dimension is determined in units of the recesses 10. You may make a mistake.

  Further, the separation distance B in the absorbent body width direction between the recesses 10 and 10 is preferably 5 mm or more in order to ensure the water permeability of the body fluid and leave a feeling of material. However, when the width A of the recess 10 is formed to be 10 mm or more, the separation distance B is preferably at least half of the width A. Further, the separation distance B does not need to have the same dimension in the width direction, and the separation distance B at the central portion in the width direction can be shortened, and the separation distance B between both sides can be lengthened.

It is preferable that the recessed part 10 is not arrange | positioned in the peripheral part of the lower layer absorber 4B. In particular, each of the longitudinal end portions, over a length F _1, F ₂ from the longitudinal edge of the absorber, and a region where the recess is not present. Urine and the like are absorbed and held by the highly water-absorbent resin 11 before reaching both ends in the longitudinal direction, so that the effect of providing this portion is small. In addition to being a cause and concern about dropping off of the superabsorbent resin 11, an uncomfortable feeling is likely to occur when the superabsorbent resin 11 absorbs water and swells. The lengths F ₁ and F ₂ vary depending on the total length of the absorber 4, but are preferably about 15% of the total length of the absorber. For the same reason, it is preferable to provide a region where the concave portion 10 does not exist on both sides of the absorber. The length C of the region in which the concave portion 10 is provided is 65% of the absorber width W. The following is preferable. Further, in the case where the recess 10 is provided more than 30 mm on the outer side in the width direction from the longitudinal center line CL, in consideration of wearability such as contact with the inner part of the base of the leg, the recess 10 is more than that provided within 30 mm. It is preferable to reduce the emboss width A or reduce the amount of the superabsorbent resin 11 accommodated in the recess 10.

  As shown in FIG. 5, when the recesses 10 are provided in an intermittent pattern, the length D of each recess 10 in the longitudinal direction of the absorbent body is 3 mm to 15 mm, preferably 5 mm to 10 mm. The length E of the 10 spaced apart portions is 1 mm to 15 mm, preferably 3 mm to 10 mm. Thereby, the bias of the highly water-absorbing resin 11 can be prevented, and quick water absorption into the highly water-absorbing resin 11 becomes possible.

  The depth of the recess 10 is set to be equal to or less than the thickness of the lower layer absorbent body 4B, and is 0.3 mm to 8 mm, preferably 2 mm to 5 mm. The amount of the superabsorbent resin 11 accommodated in the concave portion 10 is preferably about 80% of the depth of the concave portion 10, and considering the swelling when the superabsorbent resin 11 absorbs water and swells, A gap of about 20% of the depth of the recess 10 is left between the upper absorbent body 4A.

  As shown in FIG. 5, the length of the intermittent pattern lines in the longitudinal direction may be substantially the same between the intermittent pattern lines arranged in the absorber width direction, and different lengths are used as shown in FIG. It may be good. In FIG. 6, the longitudinal direction intermittent pattern lines are indicated by solid lines. In FIG. 6 (A), three intermittent pattern lines are arranged in the width direction of the absorbent body, and the intermittent pattern lines in the central part in the width direction are formed shorter than the intermittent pattern lines on both sides. The amount of water absorption in the vicinity of the part is increased. In this case, in order to secure the water absorption amount at the central portion of the absorbent body, by setting the width dimension A of the concave portion 10 of the intermittent pattern line at the central portion in the width direction to be larger than the width dimension A of the intermittent pattern line on both sides, It is preferable to increase the capacity of the resin 11. In FIG. 6B, five intermittent pattern lines are arranged in the width direction of the absorber, and the intermittent pattern lines on both sides in the width direction are gradually shortened. In this case, by setting the width dimension A of the recessed portion 10 of the intermittent pattern line in the central portion in the width direction to be larger than the width dimension A of the intermittent pattern lines on both sides, the water absorption amount in the central portion in the width direction can be secured, Leakage can be reliably prevented.

  As shown in FIG. 7, the planar shape of the recess 10 can be formed in various shapes such as (A) a rectangle, (B) a square, (C) an ellipse, and (D) a circle.

  Moreover, the said recessed part 10 can also be provided in a continuous pattern along an absorber longitudinal direction, as FIG. 8 shows. In the case of this continuous pattern, a plurality of constricted portions 10a, 10a,..., Whose emboss widths are narrowed at substantially equal intervals along the emboss line are provided. By providing a continuous pattern, it becomes continuous to supply the superabsorbent resin 11 into the recess 10 and the operation becomes easy. By providing the constricted portion 10 a, the superabsorbent resin 11 is provided along the recess 10. The bias of the superabsorbent resin 11 to which the 11 moves can be prevented. FIG. 8 (A) shows a constricted portion 10a at the center by providing protrusions at the same position on the left and right, and FIG. 8 (B) shows that left and right by providing protrusions alternately from the left and right. In FIG. 8C, the constricted portions 10a are provided in the central portion by forming both sides in an arcuate shape. Further, the recess 10 can be a combination of the intermittent pattern and the continuous pattern described above.

  As shown in FIG. 9, the cross-sectional shape of the recess 10 is (A) trapezoidal shape, (B) rectangular shape, (C) triangular shape, (D) U-shaped shape, or (E) semicircular shape. In particular, when the amount of the superabsorbent resin 11 is large, the shape of the high-pressure squeezing part and the low-pressure squeezing part is increased so as to increase the area of the inner wall surface of the recess and increase the contact area with the outer peripheral absorbent body. (See (E)).

By the way, in the said form example, although it was set as 2 layer structure which consists of upper layer absorber 4A and lower layer absorber 4B as absorber 4, as FIG. 10 shows, the said upper layer absorber 4A and lower layer absorber 4B and It is good also as a laminated structure of three or more layers in which one layer or two or more layers, in the illustrated example, one intermediate absorber 4C is laminated. As the intermediate absorbent body 4C, as in the case of the upper absorbent body 4A and the lower absorbent body 4B, those in which the superabsorbent resin 12 is dispersedly arranged in the pulp can be used.

  And the recessed part 13 can be formed in the at least 1 layer of the said intermediate absorber 4C by the embossing from the skin contact surface side, and the highly water-absorbent resin 11 can be accommodated in this recessed part 13. FIG. At this time, it is preferable to arrange | position the recessed part 13 formed in 4 C of intermediate | middle absorbers, and the recessed part 10 formed in the lower layer absorber 4B so that it may not overlap in the thickness direction of the absorber 4 as much as possible. As a result, the chance of contact with the superabsorbent resin 11 in the process of urine and the like penetrating in the thickness direction increases, and body fluid can be absorbed and held quickly. Moreover, it is preferable to arrange | position so that the quantity of the superabsorbent resin 11 accommodated in the recessed parts 10 and 13 may increase as it goes to the lower layer absorber 4B side, and the superabsorbent resin 12 disperse | distributed and arrange | positioned in a pulp. Similarly, it is preferable to arrange the amount so as to increase toward the lower layer absorber 4B side. Further, the thickness of each layer is preferably increased as it goes to the lower layer absorber 4B side, and the pulp density of each layer is preferably increased toward the lower layer absorber 4B side.

  Next, the manufacturing method of the absorbent body 4 will be described. First, after forming the lower layer absorbent body 4B by stacking the pulp mixed with the superabsorbent resin 12, the concave portion is formed by pressing from one side. 10 is formed, and the superabsorbent resin 11 is sprayed on the recesses 10. Subsequently, the upper layer absorbent body 4A formed by stacking the pulp mixed with the superabsorbent resin 12 in a separate step is laminated on the recess 10 forming surface side of the lower layer absorbent body 4B. Thereafter, if necessary, the absorbent body 4 composed of the upper layer absorbent body 4A and the lower layer absorbent body 4B is surrounded by the crepe paper 5 and sent to the next step of the manufacturing process of the light incontinence pad 1.

  Here, as the means for forming the concave portion 10, as shown in FIG. 11, a method of passing between the embossing roll 20 and the anvil roll 21 provided with a plurality of convex portions on the roll surface, or FIG. As shown in Fig. 5, any of the methods of pressing a plate-like embossed plate 22 provided with a convex portion on one surface side may be used. In the method using the embossed plate 22, a supply port of the superabsorbent resin 11 is provided on the convex portion of the embossed plate 22 (not shown), and the embossed plate 22 is at the lowest point (position where the absorber is most squeezed). At the same time as embossing is provided, the superabsorbent resin 11 starts to be discharged from the supply port and the supply of the superabsorbent resin 11 is completed in the process of pulling up the embossing plate 22. The superabsorbent resin 11 may be supplied.

  DESCRIPTION OF SYMBOLS 1 ... Light incontinence pad, 2 ... Impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 4A ... Upper layer absorber, 4B ... Lower layer absorber, 4C ... Intermediate absorber, 5 ... Crepe paper 10.13 ... concave, 11.12 ... superabsorbent resin

Claims (6)

An absorber in which an upper layer absorber positioned on the skin contact surface side and a lower layer absorber positioned on the non-skin contact surface side are laminated,
The lower layer absorber has a recess formed on the skin contact surface side, the super absorbent material is accommodated in the recess and the upper layer absorber is laminated so as to cover the opening of the recess, and the upper layer The superabsorbent resin is dispersed and arranged in the absorber and the lower absorber, and the basis weight of the superabsorbent resin dispersed and arranged in the upper absorber is more than the basis weight of the superabsorbent resin dispersed and arranged in the lower absorber. An absorber characterized by being set relatively small . Said recess is either formed in an intermittent pattern having spaced apart portions, either formed in a continuous pattern having a plurality of constricted portions narrowing the embossing width, claim 1, which is formed by a combination of these serial mounting absorber. The upper layer absorbent body has a thickness of absorbent body according to claim 1, 2 or set in less than or equal to the thickness of the lower absorbent body. The absorber according to any one of claims 1 to 3 , wherein a pulp density of the lower layer absorber is set to be relatively larger than a pulp density of the upper layer absorber. One layer or two or more layers of intermediate absorbers are laminated between the upper layer absorber and the lower layer absorber, and at least one layer of the intermediate absorber has a recess formed on the skin contact surface side. The absorber according to any one of claims 1 to 4, wherein a superabsorbent resin is accommodated. In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
An absorbent article using the absorbent according to any one of claims 1 to 5 as the absorbent.

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