JP2019170625A - Absorbent article - Google Patents

Abstract

An object of the present invention is to make it difficult for a highly water-absorbing polymer to move, not to reduce a feeling of wearing, to prevent gel blocking, and to maintain a water absorbing ability. A raised portion 8 in which at least an area corresponding to a body fluid discharge portion of a wearer on a skin side surface of a nonwoven fabric 2 has a relatively large interfiber gap formed by a raised process as compared with a base layer 3a; The non-raised portions 9 that are not subjected to the treatment each extend linearly in the front-rear direction of the wearer when worn, and are alternately arranged in a direction perpendicular to the extended portions. The water-absorbing polymer 4 is disposed. Most of the superabsorbent polymer 4 is disposed in the raising processing section 8, and the non-raising processing section 9 has a higher basis weight than the superabsorbent polymer 4 disposed in the raising section 8. It has a polymer sheet 1 on which a water-absorbing polymer 4 is arranged. [Selection diagram] Fig. 1

Description

  The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, a panty liner, an incontinence pad, and more particularly to an absorbent article in which a polymer arrangement layer is formed by performing a raising treatment on one side surface of a nonwoven fabric.

  Conventionally, as the absorbent article, a body fluid is absorbed and retained 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. The thing which interposed the absorber provided with the function to perform is known.

  Many improvements have been made to this type of absorbent article, and in the case of a relatively bulky absorbent article using pulp as the absorbent body, it is inconvenient to carry because it easily affects the body line. In addition to problems such as certain or poor storage properties, absorbent articles using thin absorbent bodies tend to be preferred due to demands for more efficient logistics and resource saving.

  As the thin absorbent body, one having a polymer sheet in which a powdery superabsorbent polymer is disposed between two layers of sheets has been proposed. The polymer sheet is excellent in that it absorbs and retains a large amount of bodily fluids, but since a collection of powdery superabsorbent polymers is disposed inside, the liquid permeability is low and the absorption speed is low. There was a problem of being slow. For this reason, when a large amount of body fluid is discharged at once, the body fluid may overflow on the polymer sheet without being absorbed by the superabsorbent polymer.

  As an absorbent article using such a polymer sheet, the following patent documents 1 and 2 can be mentioned, for example. In the following Patent Document 1, an absorbent sheet including a fiber material and superabsorbent polymer particles, wherein the superabsorbent polymer particles are dispersed in the thickness direction of the absorbent sheet while being held by the fiber material. When the region where the superabsorbent polymer particles in the thickness direction of the absorbent sheet are arranged is divided into a plurality of layered regions on a plane orthogonal to the thickness direction, An absorptive sheet is disclosed in which the average particle diameter of the superabsorbent polymer particles arranged is decreasing from one side of the absorbent sheet to the other side.

  Moreover, in the following Patent Document 2, the fiber assembly layer includes a multi-branched fiber branched so as to be able to carry a granular material, and when the multi-branched fiber is heated, the branched part has a granular particle. A granular material carrying sheet which is a fiber that can be fused to a body is disclosed.

JP 2007-167193 A JP 2005-307383 A

  However, in the absorbent sheet described in Patent Document 1, the superabsorbent polymer is dispersed throughout the entire fiber material. Therefore, when the amount of superabsorbent polymer is increased, When the water-absorbing polymer absorbs water and swells, the particles of the adjacent high water-absorbing polymer are bonded to each other, so-called “gel blocking” may occur, and a desired water absorbing power may not be expressed. In addition, when the amount of the superabsorbent polymer is increased, the superabsorbent polymer is likely to slip out of the fiber material or move inside the fibre-material to cause a bias in the superabsorbent polymer. (Particle feeling) may be given, or when the water swells and swells, a part of it may swell greatly, which may cause a reduction in wearing feeling.

  Moreover, in the granular material carrying | support sheet | seat described in the said patent document 2, since the fiber assembly layer is heat-seal | fused to the high water absorption polymer by heating, there exists a possibility that the water absorption capability of a high water absorption polymer may fall. was there.

  Therefore, the main problem of the present invention is that, in an absorbent article provided with a polymer sheet, the highly water-absorbing polymer is difficult to move, the wearing feeling is not lowered, gel blocking is unlikely to occur, and the water absorbing ability can be maintained. It is to provide an absorbent article.

In order to solve the above problems, the present invention according to claim 1 is an absorbent article including at least a polymer sheet,
The polymer sheet is subjected to the raised treatment portion in which the inter-fiber gap is formed relatively larger than the base layer by the raising treatment in the region corresponding to the body fluid discharge portion of the wearer at least on the skin side surface of the nonwoven fabric. Each non-raising treatment part extends linearly along the wearer's front-rear direction at the time of wearing, and is alternately arranged in a direction orthogonal thereto, and at least the high-absorption polymer is arranged in the raising treatment part. An absorbent article is provided which is characterized in that

  In the first aspect of the present invention, a raised treatment portion is formed by raising a predetermined interval in a region corresponding to the body fluid discharge portion of the wearer at least on the skin side surface of the nonwoven fabric. Since a polymer sheet with a conductive polymer is provided, it becomes easy to embed a superabsorbent polymer in the inter-fiber gap that has been enlarged by the raising process, and the superabsorbent polymer can be maintained fixed on the non-woven fabric. It becomes difficult for the conductive polymer to move. For this reason, the bias | inclination of a super absorbent polymer can be prevented and a feeling of mounting | wearing becomes favorable. Moreover, since the said raising process part is formed in the skin side surface of a nonwoven fabric, the body fluid which permeate | transmitted from the skin side becomes easy to be absorbed by the nonwoven fabric through this raising process part by which the space | gap between fibers was largely formed by the raising process. Furthermore, the body fluid absorbed by the nonwoven fabric diffuses to a wide range through the base layer due to capillary action, so that the body fluid can be brought into contact with a wide range of superabsorbent polymers, while preventing gel blocking of the superabsorbent polymers, and efficiency Can absorb water well.

  In addition, the polymer arrangement layer has a raised portion and a non-raised portion that extend in a continuous line along the front-rear direction and are alternately arranged in a direction perpendicular to the front and rear direction. Thus, a space for swelling can be secured, gel blocking is unlikely to occur, and a desired water absorption capacity can be obtained.

  As the present invention according to claim 2, there is provided an absorbent article according to claim 1, wherein most of the superabsorbent polymer is disposed in the raised treatment portion.

  In the second aspect of the present invention, since most of the highly water-absorbing polymer is disposed in the raised treatment part, the non-raised treatment part absorbs water from the highly absorbent polymer disposed in the raised treatment part. It functions as a buffer zone when swollen and can prevent the superabsorbent polymers in the adjacent raised portions from joining.

  As the present invention according to claim 3, the superabsorbent polymer is disposed in the non-raised treatment portion with a basis weight that is lower than the basis weight of the superabsorbent polymer disposed in the raised treatment portion. 2. An absorbent article according to any one of 2 is provided.

  In the invention according to the third aspect, when the superabsorbent polymer is sprayed on the raised treatment portion, a part is arranged also on the non-raised treatment portion. As a result, a certain amount of water absorption function can be added even in the non-raised portion. However, since most of the superabsorbent polymer is placed in the raised treatment part, the basis weight of the superabsorbent polymer placed in the non-raised part is the basis weight of the superabsorbent polymer placed in the raised part. It is lower than

  As this invention which concerns on Claim 4, the said raising process part is extended in the linear form which continues between the area | region corresponding to a wearer's bodily fluid discharge | emission part, its front side area | region, and a rear side area | region. 3. An absorbent article according to any one of 3 is provided.

  In the invention described in claim 4, since the raised portions are arranged in a continuous line from the front region to the rear region, sufficient water absorption ability is obtained while preventing gel blocking in almost all regions. In addition, by applying the raising process in a continuous line shape, by continuously applying the rotary blade to the nonwoven fabric, it is possible to surely raise the hair, and the fixability of the superabsorbent polymer to the raised treatment part is good. Become.

  As the present invention according to claim 5, the raised treatment part is disposed only in an area corresponding to the body fluid discharge part of the wearer, and has high water absorption in at least the front and rear areas separated from the raised treatment part. A polymer non-arranged region in which no polymer is arranged is formed, or a second raised treatment portion in which a gap between fibers is formed relatively larger than the base layer by raising treatment, and the second raised treatment portion A polymer arrangement region in which a highly water-absorbing polymer is arranged is formed, or a second non-raising treatment portion that is not subjected to raising treatment is formed, and the highly water-absorbing polymer is arranged in the second non-raising treatment portion. The absorptive article according to any one of claims 1 to 3 with which the polymer arrangement field formed was formed.

  In the invention of claim 5, the raised treatment part is provided only in the region corresponding to the body fluid discharge part of the wearer, and (1) a polymer non-arranged region is formed in each of the front side and rear side regions thereof. (2) The polymer arrangement region is formed after raising treatment, and (3) The polymer arrangement region is formed without raising treatment. In the form (1) in which the polymer non-arrangement region is formed, since the superabsorbent polymer is not disposed in the front region and the rear region, the flexibility of the nonwoven fabric can be maintained and the wearing feeling is excellent. In the embodiment in which the polymer arrangement region is formed after performing the raising process of (2), the highly water-absorbing polymer is easily fixed in the front region and the rear region, and the water absorption ability can be improved. In the form in which the polymer arrangement region is formed without performing the raising process of (3), the production process can be simplified and the water absorption ability can be improved because there is no raising process step.

  As the present invention according to claim 6, there is provided the absorbent article according to any one of claims 1 to 5, wherein the raised portions are arranged in a lattice shape.

  In the invention described in claim 6, by arranging the raised portions in a lattice pattern, a sufficient water absorption amount can be secured while preventing gel blocking.

  The absorbent article according to any one of claims 1 to 6, wherein a second nonwoven fabric is laminated adjacent to at least a surface of the nonwoven fabric on which the raised treatment portion is formed. Provided.

  In the invention of claim 7, since the second nonwoven fabric is laminated adjacent to the surface of the nonwoven fabric on which the raised portion is formed, the state in which the superabsorbent polymer is disposed in the polymer arrangement layer is It is easy to maintain, it is difficult to feel the foreign body feeling of the superabsorbent polymer when worn, and it can swell to the height of the second nonwoven fabric when the superabsorbent polymer absorbs water, so that gel blocking in the polymer arrangement layer can be prevented. become.

  As the present invention according to claim 8, the second nonwoven fabric and the third nonwoven fabric are laminated adjacent to the surface of the nonwoven fabric on which the raised portions are formed and the surface opposite to the surface. The absorbent article in any one of -7 is provided.

  In the invention according to claim 8, since both sides of the nonwoven fabric are laminated with the second nonwoven fabric and the third nonwoven fabric, respectively, the foreign material feeling of the superabsorbent polymer is more difficult to feel when worn.

  As described above in detail, according to the present invention, the highly water-absorbing polymer is difficult to move and the feeling of wearing is not lowered, gel blocking is unlikely to occur, and the water absorbing ability can be maintained.

It is a partially broken development view of pad 10 concerning the present invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. 1 is a plan view of a polymer sheet 1. FIG. FIG. 5 is a view taken along line VV in FIG. 4. It is sectional drawing which shows the conventional method which embeds a super absorbent polymer in a nonwoven fabric. 3 is a cross-sectional view showing a manufacturing process of the polymer sheet 1. FIG. It is a top view of the nonwoven fabric 2 which shows the arrangement pattern of the raising process part (the 1). It is the top view (the 2) of the nonwoven fabric 2 which shows the arrangement pattern of the raising process part. It is the top view (the 3) of the nonwoven fabric 2 which shows the arrangement pattern of the raising process part. It is sectional drawing of the polymer sheet 1 which concerns on a modification.

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

<Example of basic pad structure>
The pad 10 according to the present invention is a pad such as a urine collecting pad that is used by being attached to a skin contact surface such as an underwear or a paper diaper. As shown in FIGS. 1 to 3, a leak-proof sheet made of a polyethylene sheet or the like. 11, a surface sheet 12 that forms a skin contact surface and quickly transmits urine, the polymer sheet 1 interposed between both sheets 11, 12, and the outermost surface (non-skin contact surface) of the pad 10 Left and right provided in a predetermined section in the front-rear direction including at least the wearer's urination port and having a substantially lateral edge of the polymer sheet 1 as an upright base end. A pair of three-dimensional gathers BS, mainly composed of side nonwoven fabrics 14 and 14 forming BS, and around the polymer sheet 1, a leak-proof sheet 11, a surface sheet 12 and an exterior at the upper and lower edges The outer edge of the sheet 13 is bonded by bonding means such as an adhesive such as hot melt, heat sealing, ultrasonic sealing, etc., and the both sides of the leakage preventing sheet 11 extends laterally from the polymer sheet 1. The top sheet 12, the exterior sheet 13, and the side nonwoven fabric 14 are joined by a bonding means such as an adhesive such as hot melt, heat sealing, or ultrasonic sealing.

  As the leak-proof sheet 11, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be 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. As the leak-proof sheet 11, a polylaminated nonwoven fabric in which a plastic film and a nonwoven fabric are laminated may be used.

  Next, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like is preferably used as the top sheet 12. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulkiness and high compression recovery. When a large number of through-holes are formed in the top sheet 12, body fluid is quickly absorbed and the dry touch properties are excellent. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Moreover, a core-sheath fiber, a side-by-side fiber, or a split fiber composite 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 suitably used.

The exterior sheet 13 covers the leak-proof sheet 11 so that the outer surface of the pad 10 looks and feels like a cloth. The exterior sheet 13 is preferably formed from a nonwoven fabric. As the material fiber, olefin fiber such as polyethylene or polypropylene, polyester fiber, polyamide fiber, etc., recycled fiber such as rayon and cupra, and natural fiber such as cotton can be used. The spun bond method, the thermal bond method, the air through method, the needle punch method and the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved.
In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can also be used. When a plurality of nonwoven fabrics are used, it is preferable to fix the nonwoven fabrics together with an adhesive such as hot melt. Moreover, when using a nonwoven fabric, the fiber basis weight is 10-50 g / m < ² >, Especially 15-30 g / m < ² > is preferable.

  One or more temporary fixing layers (not shown) may be formed on the non-use surface side (outer surface) of the exterior sheet 13. The temporary fixing layer may or may not be provided. However, by providing the temporary fixing layer, the pad 10 can be fixed to an undergarment or a paper diaper when worn on the body. As the temporary fixing layer, a mechanically bonded hook material or an adhesive may be used.

In the illustrated example, the exterior sheet 13 is slightly wider than the width of the polymer sheet 1, and the both side portions are wound around the side edges of the leak-proof sheet 11 and the surface sheet 12 to the skin side of the surface sheet 12. The outer side in the width direction of the surface sheet 12 is extended to the outer surface side of the exterior sheet 13 extending to the skin side by side nonwoven fabrics 14, specifically urine and the like, extending from both side surfaces of the surface sheet 12. A side nonwoven fabric 14 made of a nonwoven fabric material subjected to appropriate water-repellent treatment or hydrophilic treatment is disposed in accordance with the purpose of preventing it from occurring or enhancing the feeling of touch. The side nonwoven fabric 14 may be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 14 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 13 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. in order to reliably prevent permeation of body fluids. A water repellent nonwoven fabric coated with is preferably used.

  The inner side portion of the side nonwoven fabric 14 is folded substantially double, and inside this double sheet, one or a plurality of both ends or appropriate positions in the longitudinal direction are fixed to the intermediate portion in the height direction, In the illustrated example, three thread-like elastic elastic members 15, 15... Are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. As shown in FIG. 3, the double sheet portion is attached to the polymer sheet 1 side in a state where it is folded once outward and laminated, thereby including at least the urination port of the wearer. As shown in FIG. 2 within a predetermined section in the direction, the three-dimensional gathers BS and BS standing on the skin side are formed in a pair of left and right.

<Polymer sheet>
As shown in FIGS. 4 and 5, the polymer sheet 1 has an interfiber spacing relatively to the region corresponding to at least the wearer's body fluid discharge portion on the skin side surface of the nonwoven fabric 2 compared to the base layer 3 a by raising treatment. The brushed treatment portion 8 formed with a large length and the non-raised treatment portion 9 not subjected to the raised treatment each extend in a linear shape along the wearer's front-rear direction when worn, and in a direction orthogonal thereto Alternatingly arranged, the superabsorbent polymer 4 is disposed at least in the raised treatment part 8. In FIG. 5, the polymer arrangement layer 3 is a raised treatment portion raised (bulged) on the skin side from the base layer 3 a of the nonwoven fabric 2 by raising treatment with a predetermined interval. As shown in FIG. 5, the polymer sheet 1 includes a single nonwoven fabric 2 composed of a base layer 3 a on the non-skin side and the polymer arrangement layer 3 on the skin side. The region corresponding to the body fluid discharge portion of the wearer described above is a region in the center in the width direction in the longitudinal section corresponding to the wearer's crotch when the pad 10 is worn, so that it can easily fit around the wearer's leg. In the case where a leg-periphery cut line is formed by cutting out both side portions of the polymer sheet 1, this is a region in the center in the width direction where the leg-periphery cut line is provided. In the case where the leg-around cut line is not provided, it is a central region in the width direction of the central 1/3 section when the polymer sheet 1 is divided into three equal parts in the longitudinal direction. The above-mentioned central region in the width direction is a central 3/5 section excluding the 1/5 sections on both sides when the polymer sheet 1 is roughly divided into 5 in the width direction.

  As shown in FIGS. 2 and 3, it is preferable that the polymer sheet 1 has the nonwoven fabric 2 in which the superabsorbent polymer 4 is disposed alone in the raised treatment portion 8 subjected to a predetermined raised treatment. That is, the polymer sheet 1 is composed of one layer of the nonwoven fabric 2, the surface sheet 12 is disposed adjacent to the skin side of the nonwoven fabric 2, and the leak-proof sheet 11 is disposed adjacent to the non-skin side. It is preferable to do this. As a result, the pad 10 can be made thinner and more comfortable to wear. Further, since the body fluid that has permeated the surface sheet 12 is directly absorbed by the polymer sheet 1 through the raised treatment portions 8..., The raised water treatment portion 8 in which the inter-fiber gap is increased by the raising treatment has a high initial water absorption capability. The initial water absorption capacity can be sufficiently increased by fully utilizing.

  The base layer 3a is a layer that has a relatively small inter-fiber gap and does not bulge to the skin side by the raising process, and is a layer that has substantially the same thickness as the nonwoven fabric before the raising process. The polymer arrangement layer 3 is a layer that includes a raised treatment portion 8 in which a gap between fibers is formed relatively larger than the base layer 3a by the raising treatment, and bulges to the skin side from the base layer 3a.

  As the nonwoven fabric 2, a porous or non-porous nonwoven fabric is used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and hydrophilic cellulosic fibers. Examples of the hydrophilic cellulosic fibers include naturally derived fibers such as cotton fibers and pulp fibers, and artificial cellulosic fibers such as rayon fibers, acetate fibers, and lyocell fibers. Examples of the cotton fibers include raw cotton, refined / bleached cotton fibers, or refined / bleached cotton fibers that have been dyed, refined / bleached cotton wool fibers, and yarns or fabrics that have been defibrated. Any cotton fibers such as hair can be used, but in order to increase the absorption speed and diffusibility of the liquid in the non-woven fabric 2, it is particularly preferable to use absorbent cotton obtained by degreasing the natural oil of cotton wax adhering to the surface of the cotton fibers. . Although the processing method of the said nonwoven fabric is not ask | required, in order to prevent the superabsorbent polymer 4 from falling off, such as an air through method, a spun bond method, a melt blown method, a needle punch method, etc. It is preferable to do this. In particular, an air-through method that can increase the bulk is desirable.

Basis weight of the nonwoven fabric 2 is preferably at 15 g / ^{m 2} or more, particularly preferably 40~150g / ^{m 2.} When the basis weight of the nonwoven fabric is less than 15 g / m ² , the bulk is small and sufficient raising treatment cannot be performed.

  As a conventional technique for dispersing and disposing a superabsorbent polymer in a nonwoven fabric, there is one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-167193). In this conventional technique, as shown in FIG. 6 (A), the superabsorbent polymer is first sprayed from above one side of the nonwoven fabric in a dry state, and then shown in FIG. 6 (B). In this way, vibration is applied to the nonwoven fabric on which the superabsorbent polymer is dispersed. In this conventional method, the superabsorbent polymer particles move downward through the gap formed by the fibers constituting the nonwoven fabric by vibration. A superabsorbent polymer having a small particle size is more easily moved downward, and a superabsorbent polymer having a larger particle size is less likely to move. However, in this conventional method, as shown in FIG. 6B, there is a problem that a superabsorbent polymer having a particle size larger than the gap between fibers constituting the nonwoven fabric cannot be embedded in the nonwoven fabric. In order to penetrate into the inside of the nonwoven fabric, the average particle size of the superabsorbent polymer had to be 100 to 300 μm, and those having a large particle size of 500 μm or more could not be buried. Moreover, since the average particle diameter of the highly water-absorbing polymer disposed inside the nonwoven fabric is substantially constant, there is also a problem that gel blocking tends to occur when water is absorbed and swollen.

  Therefore, in the polymer sheet 1 according to the present invention, as described above, the raised treatment portion 8 is formed by subjecting the nonwoven fabric 2 to a raised treatment with a predetermined interval, and the raised treatment portion 8 is formed with a superabsorbent polymer. 4 is arranged.

  In order to form the raised treatment portion 8 on the nonwoven fabric 2, the raised treatment shown below is used. As the means for forming the raised treatment portion 8, as shown in FIG. 7B, a plurality of cutter blades are provided on the peripheral surface of the nonwoven fabric 2 having a flat surface as shown in FIG. Are arranged in parallel at a predetermined interval, and are subjected to a raising process that damages the constituent fibers of the nonwoven fabric 2 at a predetermined depth on one side surface of the nonwoven fabric 2 to cause fluffing or thread breakage. Thus, the brushed portion 8 is formed at a predetermined height. The portion subjected to the raising process by the rotary blade 7 becomes a protruding portion in which the fibers are fluffed and relatively protruded, while the raising process is not performed between the adjacent rotary blades 7 and 7, but the adjacent raised It becomes the non-raising processing part 9 by which the surface was covered with the fiber protruded by the raising process of the process part 8. FIG. The brushed portion 8 is a region where the superabsorbent polymer 4 is mainly disposed, and as shown in FIG. 7C, a large particle size is obtained by spraying the superabsorbent polymer 4 on the brushed portion 8. The superabsorbent polymer 4 can also be disposed in the inter-fiber gap that has been enlarged by the raising treatment (FIG. 7D).

  The surroundings of the raising treatment part 8 are always surrounded by the non-raising treatment part 9, and the superabsorbent polymer 4 disposed in the raising treatment part 8 is prevented from spilling out of the polymer sheet 1 immediately. . By spreading the superabsorbent polymer 4 on the raised treatment part 8, the superabsorbent polymer 4 is disposed in the raised treatment part 8 and between the fibers of the base layer 3 a constituting the bottom of the raised treatment part 8. The superabsorbent polymer 4 having a very small particle diameter is embedded, and the superabsorbent polymer 4 spilled from the raised treatment portion 8 is between the fibers protruding from the adjacent raised treatment portion 8 or between the non-raised treatment portions 9. It is also embedded between the fibers of the base layer 3a. The superabsorbent polymer 4 embedded in the base layer 3a has a particle size smaller than these interfiber spaces.

  As shown in FIG. 7C, the polymer arrangement layer 3 formed by the above-described raising treatment has an end portion of the cut fiber protruding from the upper end of the raising treatment portion 8 to the surface. For this reason, after the superabsorbent polymer 4 is disposed in the raised treatment portion 8, the surface of the superabsorbent polymer 4 is covered with the fiber protruding from the surface of the raised treatment portion 8, thereby serving as a lid. The state in which the superabsorbent polymer 4 is disposed in the raised treatment portion 8 is easily maintained.

  As shown in FIG. 7 (C), the width W1 of the raised treatment portion 8 is arbitrary, but 1-30 mm is preferable from the viewpoint of ensuring water absorption by the highly water-absorbing polymer 4 and preventing gel blocking. preferable. The width W1 substantially matches the blade thickness of the rotary blade 7 when the raising process is performed. The width W1 of the raised treatment portion 8 is such that a cut surface of the nonwoven fabric 2 is produced by a line that crosses the raised treatment portion 8 substantially vertically, and this cut surface is obtained using a digital microscope (for example, VHX-1000 manufactured by Keyence Corporation). It is possible to take an enlarged photograph of and measure based on this enlarged photograph.

  Moreover, the width | variety (space | interval of the adjacent raising part 8 and 8) W2 of the non-raising process part 9 is 1-30 mm from a viewpoint of preventing the gel blocking at the time of water absorption of the highly water-absorbing polymer 4. FIG. This width W2 substantially coincides with the separation width of the adjacent rotary blades 7 and 7 when the above-described raising process is performed. As for the relationship between the widths W1 and W2, W1 and W2 can be equal or larger, but it is preferable to make the width W1 of the raised treatment portion 8 smaller than the width W2 of the non-raised treatment portion 9. Thereby, the gel blocking when the highly water-absorbing polymer 4 absorbs water and swells between the adjacent raised portions 8 and 8 can be reliably prevented. Even in this case, a certain amount of the highly water-absorbing polymer 4 is disposed also in the non-raised portion 9 that is relatively wide, so that sufficient water absorption can be secured.

  On the other hand, the depth of the polymer arrangement layer 3 is also arbitrary, but is 10 to 80%, preferably 50 to 70%, based on the total thickness of the base layer 3a and the polymer arrangement layer 3 after the raising treatment. It is good.

  As shown in FIG. 4, the polymer arrangement layer 3 extends in a linear shape in which the raised treatment portion 8 and the non-raised treatment portion 9 are continuous along the wearer's front-rear direction when worn, and is orthogonal thereto. In the direction, the raised treatment portions 8 and the non-raised treatment portions 9 are alternately arranged. Thereby, the arrangement | positioning area | region of the highly water-absorbing polymer 4 comes to be provided over two or more strips, and while this superabsorbent polymer 4 can absorb a body fluid reliably, a gel blocking can be prevented now reliably. In this case, in order to prevent the superabsorbent polymer 4 from spilling off from both sides of the nonwoven fabric 2, the non-raised portion 9 is positioned at both ends of the nonwoven fabric 2, and the raised portion 8 and the non-raised portion 8 are not located at the middle in the width direction. It is preferable to arrange the raised treatment portions 9 alternately.

  The raised treatment part 8 is preferably formed in an intermediate part that does not reach the edge of the nonwoven fabric 2 in plan view of the nonwoven fabric 2. That is, both ends in the front-rear direction and both ends in the width direction of the nonwoven fabric 2 are regions where the raised portions 8 are not formed. Thereby, it is possible to prevent the superabsorbent polymer 4 that has fallen off from the raised portion 8 from spilling out of the nonwoven fabric 2.

  The said raising process part 8 can be formed by arbitrary plane patterns. For example, as shown in FIG. 8, the raised treatment part 8 is arranged in a continuous line between the area A corresponding to the body fluid discharge part of the wearer and the front area B and the rear area C thereof. can do. That is, while the raising part 8 passes from the front side region B to the rear side region C through the region A corresponding to the body fluid discharge unit, it is a linear line continuously extending in the front-rear direction without being intermittent or It is formed in a band shape. Thereby, sufficient water absorption ability can be obtained while preventing gel blocking in almost all regions from the front region B to the rear region C of the polymer sheet 1. Further, by applying the raising process in a continuous line shape, a predetermined portion can be raised with certainty by continuously applying a rotary blade to the nonwoven fabric 2, and the superabsorbent polymer 4 for the raising treatment part 8 can be raised. The fixability of is improved.

  As shown in FIG. 8 (A), the raised portions 8 are formed to have substantially the same width and may be arranged at substantially equal intervals, as shown in FIGS. 8 (B) and 8 (C). Moreover, you may change either the width | variety of the raising process part 8, and an interval (width | variety of the non-raising process part 9) or both. For example, as shown in FIG. 8B, it can be formed such that the separation distance between the adjacent raised portions 8 is gradually increased toward the outer side in the width direction. Thereby, the density of the superabsorbent polymer 4 in the width direction center part in which a wearer's bodily fluid discharge | emission part is located becomes high, and can improve a water absorption capability. Further, as shown in FIG. 8C, the width of the raised treatment unit 8 may be gradually reduced toward the outer side in the width direction. Thereby, while maintaining the water absorption capability in the center in the width direction where the wearer's body fluid discharge portion is located, the width of the arrangement site of the high water absorption polymer 4 on both sides is reduced, thereby achieving a high density and high water absorption polymer. Hardness due to the arrangement of 4 can be suppressed, and when used for a pad or the like, the resistance to the inner part of the base of the leg can be reduced.

  Further, as shown in FIG. 9, the raised treatment part 8 may be disposed only in the area A corresponding to the body fluid discharge part of the wearer, and may not extend to the front area B and the rear area C. . If this form can prevent gel blocking in the region corresponding to the body fluid discharge part of the wearer, the body fluid can be absorbed by the nonwoven fabric 2, and once the body fluid is absorbed by the nonwoven fabric 2, the interfiber spaces of the nonwoven fabric 2 can be absorbed by capillary action. It is based on the idea that it can diffuse to obtain a sufficient water absorption capacity. The raised treatment part 8 may be disposed only in the region corresponding to the body fluid discharge part of the wearer, that is, in the center region in the width direction, and the raised treatment part 8 is not provided on both sides in the width direction. Is preferred. Accordingly, the raised treatment portions 8 bulge to the skin side in the region corresponding to the body fluid discharge portion of the wearer, and the outer peripheral portion thereof is formed relatively low on the skin side, so that the raised treatment portions 8. The adhesion of the wearer to the body fluid discharge portion can also be improved.

As shown in FIG. 9A, a polymer non-arranged region where the superabsorbent polymer 4 is not disposed is formed in at least the front and rear regions of the raised portions 8. The polymer non-arrangement region is arranged in the non-raised treatment portion 9 although a superabsorbent polymer 4 is not arranged at all, or a slight amount of polymer is arranged, for example, when spilled down when sprayed on the raised treatment portion 8. The area is less than the amount to be done. Specifically, the basis weight of the polymer is preferably less than 1 g / m ² . The boundary between the non-raised portion 9 and the polymer non-arranged region is not necessarily clear, and the non-raised portion 9 is formed around the raised portions 8... From the outer side to the edge of the nonwoven fabric 2. Is a polymer non-arrangement region. Although it is not clear in the illustrated example, it is preferable to form the outer side of the non-raising portion 9 in both side regions of the raising portions 8 in addition to the front and rear regions of the raising portions 8. By forming the polymer non-arranged region, the flexibility of the outer edge portion of the nonwoven fabric 2 can be maintained, the skin contact with the base of the leg, the abdomen, or the buttock becomes soft, and the feeling of wearing becomes excellent.

  Further, as shown in FIG. 9 (B), at least the front and rear regions of the raised treatment portions 8... In the illustrated example, in addition to this, both side regions of the raised treatment portions 8. In each of the regions a), a second raised treatment portion in which the inter-fiber gap is formed relatively larger than the base layer 3a by the raising treatment is formed, and the superabsorbent polymer 4 is formed in the second raised treatment portion. An arranged polymer arrangement region may be formed. The region a is formed in an intermediate portion that does not reach the outer edge of the nonwoven fabric 2 with a predetermined separation distance corresponding to the width of the non-raising treatment portion 9 from the raising treatment portions 8. In the second raising processing part, the region a may be raised over the entire surface, or may be raised with a plurality of linear patterns along the front-rear direction with a predetermined interval in the width direction. Good. The basis weight of the superabsorbent polymer 4 in the region a is preferably lower than that in the raised treatment portion 8 in order to suppress an increase in hardness due to the superabsorbent polymer 4 in the region a. The rate of decrease is preferably about 1/10 to 1/30 of the basis weight of the superabsorbent polymer 4 sprayed on the raised treatment portion 8. Further, the depth of the second raising process is preferably reduced accordingly. By arranging the highly water-absorbing polymer 4 by performing the second raising process, the highly water-absorbing polymer 4 can be easily fixed and the water absorbing ability can be improved.

  Moreover, in the said area | region a, the 2nd non-raising process part which does not perform a raising process may be formed, and the polymer arrangement | positioning area | region where the super absorbent polymer 4 is arrange | positioned at this 2nd raising process part may be formed. In the second non-raising portion, the superabsorbent polymer 4 is directly sprayed on the non-woven fabric that is not subjected to the raising treatment, and the superabsorbent polymer 4 is embedded in the non-woven fabric by applying vibration or the like. In this polymer arrangement region, it is preferable to make the amount smaller than the basis weight of the superabsorbent polymer 4 sprayed on the raised treatment portion 8 as in the case where the second raised treatment is performed. In this form, since the polymer arrangement | positioning area | region is formed without performing a raising process, since there is no raising process process, a manufacturing process can be simplified and water absorption ability can be improved.

  As shown in FIG. 10, the raised treatment portions 8 may be arranged in a lattice shape. By setting it as a lattice pattern, sufficient water absorption capability can be secured while preventing gel blocking. As shown in FIG. 10 (A), the lattice pattern may be formed continuously between the region A corresponding to the body fluid discharge portion of the wearer and the front region B and the rear region C thereof. Alternatively, as shown in FIG. 10B, it may be formed only in the region A corresponding to the body fluid discharge portion of the wearer. Further, as shown in FIG. 10 (C), the raised pattern processing portion 8 having a lattice pattern is disposed only in the region A corresponding to the body fluid discharge portion of the wearer, and at least the front side separated from the raised treatment portion 8 In addition, in the illustrated example, a second raised portion is formed by raising in the both sides (region a) in addition to the above in the illustrated example, respectively, and high water absorption is formed in the second raised portion. The polymer arrangement | positioning area | region where the conductive polymer 4 was arrange | positioned was formed, or the 2nd non-raising process part which does not perform a raising process was formed, and the superabsorbent polymer 4 was arrange | positioned in this 2nd non-raising process part A polymer arrangement region may be formed.

The superabsorbent polymer 4 includes “powder” in addition to “particles”. The superabsorbent polymer 4 having a particle size used for this type of absorbent article can be used as it is. The average particle size is 1000 μm or less, and preferably 99 μm or more when not absorbed. It is desirable that the weight is not less than 99% by weight, in particular, 150 to 850 μm. The average particle size at the time of non-absorption is preferably about 250 to 500 μm. In addition, it is desirable that the superabsorbent polymer 4 has an average particle size after absorption of at least three times the average particle size when not absorbed, specifically 500 μm or more. In addition, the average particle diameter of the superabsorbent polymer 4 when not absorbed means a particle diameter at an integrated value of 50% in the weight-based particle size distribution. The weight-based particle size distribution in this case is measured according to JISZ8815-1994. That is, 710 μm, 500 μm, 300 μm, 150 μm, and 106 μm aperture sieves having an inner diameter of 150 mm and a depth of 45 mm are stacked with a narrow aperture sieve on top, and the top 710 μm sieve having the widest aperture. 50 g of a measurement sample is placed in a sieve shaker for 10 minutes, the weight of the measurement sample remaining on each sieve is measured, and the measurement sample remaining on each sieve is measured based on the weight of the first measurement sample. Measured by determining weight percent.
The basis weight of the superabsorbent polymer 4 in the raised portion 8 can be appropriately determined according to the amount of absorption required for the use of the polymer sheet. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer is given.

The superabsorbent polymer 4 may be disposed only in the raised treatment portion 8, but as shown in FIG. 5, the superabsorbent polymer dispersed in the raised treatment portion 8 in the non-raised treatment portion 9. A part of 4 may be embedded. The highly water-absorbing polymer 4 disposed in the non-raising treatment portion 9 is disposed such that a part of the highly water-absorbing polymer 4 sprayed on the raising treatment portion 8 is spilled, etc. This is smaller than the weight per unit area arranged in FIG. The basis weight of the superabsorbent polymer 4 disposed in the non-raising portion 9 is preferably about 1 to 50 g / m ² from the viewpoint of preventing gel blocking.

  In the above embodiment, the polymer sheet 1 is composed of a single nonwoven fabric 2, but as shown in FIG. 11 (A), adjacent to the surface of the nonwoven fabric 2 on the side where the raised portions 8 are formed. Then, the second nonwoven fabric 5 may be laminated. By laminating the second nonwoven fabric 5, it becomes easy to maintain the state in which the superabsorbent polymer 4 is embedded in the polymer arrangement layer 3, and it is difficult to feel the foreign matter of the superabsorbent polymer 4 when worn. When 4 absorbs water, it can swell to the height of the second nonwoven fabric 5. As the second nonwoven fabric 5, the same material as the nonwoven fabric 2 can be used. The second nonwoven fabric 5 is preferably thinner than the nonwoven fabric 2 so that the thickness of the polymer sheet does not increase.

  Moreover, as shown in FIG. 11 (B), the second nonwoven fabric 5 and the third nonwoven fabric 6 are respectively adjacent to the surface of the nonwoven fabric 2 on which the raised portions 8 are formed and the surface on the opposite side. May be laminated. Thereby, the foreign material feeling of the highly water-absorbing polymer 4 is further less felt when worn. From the viewpoint of reducing the thickness of the polymer sheet 4, it is desirable that the second nonwoven fabric 5 and the third nonwoven fabric are formed thinner than the nonwoven fabric 2.

  In the polymer sheet 1 having the above-described configuration, a raised treatment portion 8 is formed by a predetermined raising treatment at least in a region corresponding to the body fluid discharge portion of the wearer on the skin side surface of the nonwoven fabric 2. Since the water-absorbing polymer 4 is disposed, the superabsorbent polymer 4 is easily embedded in the inter-fiber gaps enlarged by the raising process, and the superabsorbent polymer 4 can be maintained in a fixed state on the nonwoven fabric 2. The movement of the polymer 4 can be prevented. Therefore, the superabsorbent polymer 4 does not slip out of the non-woven fabric 2 and the superabsorbent polymer 4 is not biased, thereby improving the wearing feeling. In addition, since the highly water-absorbing polymer 4 is dispersed and arranged in the raised treatment portion 8 that has undergone the raising treatment, a space for the highly water-absorbing polymer 4 to absorb water and swell can be secured, and liquid absorption failure due to gel blocking can be secured. Is less likely to occur, and a desired water absorption capacity can be obtained.

  DESCRIPTION OF SYMBOLS 1 ... Polymer sheet, 2 ... Nonwoven fabric, 3 ... Polymer arrangement | positioning layer, 3a ... Base layer, 4 ... Superabsorbent polymer, 5 ... 2nd nonwoven fabric, 6 ... 3rd nonwoven fabric, 7 ... Rotary blade, 8 ... Brushed processing part, 9 ... non-raising processing part, 10 ... pad, 11 ... leak-proof sheet, 12 ... surface sheet, 13 ... exterior sheet, 14 ... side nonwoven fabric, 15 ... thread-like elastic elastic member

Claims (8)

An absorbent article comprising at least a polymer sheet,
The polymer sheet is subjected to the raised treatment portion in which the inter-fiber gap is formed relatively larger than the base layer by the raising treatment in the region corresponding to the body fluid discharge portion of the wearer at least on the skin side surface of the nonwoven fabric. Each non-raising treatment part extends linearly along the wearer's front-rear direction at the time of wearing, and is alternately arranged in a direction orthogonal thereto, and at least the high-absorption polymer is arranged in the raising treatment part. Absorbent article characterized by being made.   The absorptive article according to claim 1 in which most of the superabsorbent polymer is arranged in said raising part.   The absorbent article according to any one of claims 1 and 2, wherein the superabsorbent polymer is disposed in the non-raised treatment portion with a basis weight that is lower than a basis weight of the superabsorbent polymer disposed in the raised treatment portion. .   The absorptive article according to any one of claims 1 to 3 in which said raising treatment part is prolonged in the shape of a line which continues between a field corresponding to a wearer's bodily fluid discharge part, and its front field and back field. .   The raised part is disposed only in a region corresponding to the body fluid discharge part of the wearer, and a polymer non-arranged region in which the superabsorbent polymer is not disposed in at least the front and rear regions separated from the raised part. A second raised treatment part in which the interfiber gap is formed relatively larger than the base layer by the raised treatment is formed, and the superabsorbent polymer is disposed in the second raised treatment part A polymer arrangement region is formed, or a second non-raising treatment portion not subjected to raising treatment is formed, and a polymer arrangement region in which a superabsorbent polymer is arranged in the second non-raising treatment portion is formed. The absorbent article according to any one of claims 1 to 3.   The absorbent article according to any one of claims 1 to 5, wherein the raised portions are arranged in a lattice pattern.   The absorptive article according to any one of claims 1 to 6, wherein a second nonwoven fabric is laminated adjacent to at least a surface of the nonwoven fabric on which the raised portion is formed.   The absorptivity according to any one of claims 1 to 7, wherein a second nonwoven fabric and a third nonwoven fabric are laminated adjacent to a surface of the nonwoven fabric on which the raised portion is formed and a surface opposite to the surface. Goods.

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