JP2019042038A - High absorbent sheet and absorbent article having the same - Google Patents

Abstract

To provide a high absorbent sheet capable of preferably maintaining a state in which a high absorbent polymer is fixed and carried and excellent in productivity.SOLUTION: There is provided a high absorbent sheet 1 in which high absorbent polymers 3 are fixed and carried between two base body nonwoven fabrics 2. At least one base body nonwoven fabric 2 is raised on one surface, by being subjected to raising processing, an adhesive is applied to a raised surface of the base body nonwoven fabric 2, and the high absorbent polymer 3 is fixed and carried quantitatively on a raised surface of the base body nonwoven fabric 2, in the high absorbent sheet 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a superabsorbent sheet that is excellent in productivity and can maintain a state in which a superabsorbent polymer is fixedly supported.

  In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The body fluid is absorbed by the absorbent body through the top sheet. There are various types of these absorbent articles, such as tape-type paper diapers, pants-type paper diapers, urine collection pads, and light incontinence pads, whether for adults or infants. .

  About the absorber which comprises these absorbent articles, although it was common to use a fluff pulp and a superabsorbent polymer (also called Super Absorbent Polymer, SAP) together, the feeling of wear at the time of wear, appearance, and touch For the purpose of improving the above and reducing the return of urine, a so-called superabsorbent sheet (also referred to as SAP sheet) made of a non-woven fabric serving as a base and a superabsorbent polymer may be used as the absorber.

  In such a superabsorbent sheet, the superabsorbent polymer moves due to the wearer's action when wearing an absorbent article equipped with the superabsorbent sheet, resulting in non-uniform distribution of the superabsorbent polymer. There was a problem that decreased. In particular, in the superabsorbent sheet not containing fluff pulp, the superabsorbent polymer is fixed only by the adhesive, and therefore the fixing of the superabsorbent polymer by the adhesive becomes difficult as the amount of the superabsorbent polymer increases. Therefore, it was difficult to maintain the superabsorbent polymer in a uniformly distributed state. Thus, studies have been made on fixing and supporting a superabsorbent polymer in a superabsorbent sheet.

  For example, Patent Document 1 discloses a superabsorbent sheet that does not include fluff pulp, and the superabsorbent sheet includes two non-woven fabrics provided between the non-woven fabrics. The superabsorbent polymer is bonded only by the center layer in the thickness direction between the upper and lower two network layers of the hot melt adhesive. A superabsorbent sheet characterized in that the two nonwoven fabrics are partially welded to each other in a non-existing portion of the superabsorbent polymer, and the network layer has a large number of voids. Is disclosed.

  Patent Document 2 also includes a step of advancing a first nonwoven layer with a first surface facing the suction chamber at a first speed, and a first nonwoven layer opposite to the first surface. Distributing the superabsorbent polymer on the second surface and movable with respect to the first nonwoven layer having a speed difference and penetrating the first nonwoven layer through the second surface The manufacturing method of a superabsorbent sheet | seat provided with the step of volumeifying a 1st nonwoven layer using the tooth | gear part to do is disclosed.

Japanese Patent No. 3908403 JP 2017-99855 A

  However, in the superabsorbent sheet described in Patent Document 1, the superabsorbent polymer is fixedly supported on the network layer made of the hot melt adhesive, but if the superabsorbent polymer is fixedly supported by the network layer, The speed was reduced and the production efficiency was not satisfactory.

  Moreover, in the manufacturing method of the superabsorbent sheet described in Patent Document 2, a method is disclosed in which the nonwoven fabric layer is volumized before and after the superabsorbent polymer is distributed to the nonwoven fabric, and the base nonwoven fabric is laminated. Since the superabsorbent polymer is present in the volume of the nonwoven fabric without using an adhesive, the superabsorbent polymer in use sometimes moves.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a superabsorbent sheet that is excellent in productivity and can maintain a state in which a superabsorbent polymer is fixedly supported.

  The inventors of the present invention have conducted intensive research in view of the above problems. As a result, the inventors have found that the above-mentioned problems can be solved by devising the aspect of the nonwoven fabric to be the substrate and the method for fixing and supporting the superabsorbent polymer, and have completed the present invention. Specifically, the present invention provides the following.

  (1) A first aspect of the present invention is a superabsorbent sheet in which a superabsorbent polymer is fixedly supported between two base nonwoven fabrics, and at least one base nonwoven fabric is on one side surface, Raising is performed by raising the surface, the adhesive is applied to the raised surface of the base nonwoven fabric, and the superabsorbent polymer is quantitatively fixed and supported on the raised surface of the base nonwoven fabric. It is a highly absorbent sheet.

  (2) A second aspect of the present invention is the superabsorbent sheet according to (1), characterized in that the whole is wrapped with a hydrophilic sheet.

(3) A third aspect of the present invention is the superabsorbent sheet according to (1) or (2), wherein the base nonwoven fabric has a basis weight of 20 g / m ² or more and 90 g / m ² or less. It is characterized by.

  (4) A fourth aspect of the present invention is the superabsorbent sheet according to any one of (1) to (3), wherein the two base nonwoven fabrics are air-through nonwoven fabrics, and the two base nonwoven fabrics A superabsorbent polymer is fixedly supported between each of the bulky surfaces, and one of the bulky surfaces is brushed.

  (5) The fifth aspect of the present invention is any one of (1) to (4), wherein the liquid permeable top sheet, the liquid impermeable back sheet, and the top sheet and the back sheet are arranged. And a superabsorbent sheet as described above.

  The superabsorbent sheet of the present invention is a superabsorbent sheet in which a superabsorbent polymer is fixedly supported between two base non-woven fabrics, and at least one base non-woven fabric is subjected to raising treatment on one side surface. It is raised by being applied, and an adhesive is applied to the raised surface of the substrate nonwoven fabric, and the superabsorbent polymer is quantitatively fixed and supported on the raised surface of the substrate nonwoven fabric. Therefore, the state in which the superabsorbent polymer is fixedly supported can be favorably maintained. In addition, since the superabsorbent polymer is fixedly supported by a simple structure of raising treatment and adhesive application, productivity is also excellent. Therefore, according to the present invention, it is possible to obtain a superabsorbent sheet that is excellent in productivity and can maintain a state in which the superabsorbent polymer is fixedly supported.

It is width direction sectional drawing of the superabsorbent sheet of this invention. It is width direction sectional drawing of the superabsorbent sheet of this invention. It is drawing which shows the aspect in which the superabsorbent polymer non-insertion part and the superabsorbent polymer insertion part were provided in the flow direction according to the cut width.

<High absorbent sheet>
Regardless of whether it is for adults or infants, the superabsorbent sheet 1 is a tape-type paper diaper, a pant-type paper diaper, a urine-absorbing pad, a light incontinence pad, etc. It can be used as an absorber. In the description of the present specification, the longitudinal direction of the superabsorbent sheet 1 is the direction in which the base nonwoven fabric 2 travels when the superabsorbent sheet 1 is manufactured. Moreover, the width direction of the superabsorbent sheet 1 is a direction that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by X in the drawing. The thickness direction of the superabsorbent sheet 1 is indicated by Y in the figure.

  1 and 2 are cross-sectional views in the width direction of the superabsorbent sheet 1. As shown in FIGS. 1 and 2, the superabsorbent sheet 1 of the present invention has a superabsorbent polymer 3 fixedly supported between two base nonwoven fabrics 2. In addition, at least one base nonwoven fabric 2 is raised by performing raising treatment on the surface of one side. Further, an adhesive is applied to the surface on which the two base nonwoven fabrics 2 are bonded together, and the superabsorbent polymer 3 is quantitatively fixed and supported on the raised surface on which the adhesive of the base nonwoven fabric 2 is applied. Therefore, the state in which the superabsorbent polymer 3 is fixedly supported can be favorably maintained. Moreover, since the superabsorbent polymer 3 is fixedly supported by a simple configuration of raising treatment and applying an adhesive, the productivity is excellent. In addition, when using the superabsorbent sheet 1 as an absorbent body of an absorbent article, the base nonwoven fabric 2 of the two base nonwoven fabrics 2 is incorporated so as to be on the skin contact surface side of the wearer of the absorbent article. But you can.

(Substrate nonwoven fabric)
As described above, the superabsorbent polymer 3 is supported between the two base nonwoven fabrics 2. Examples of the base nonwoven fabric 2 include nonwoven fabrics such as air-through nonwoven fabric, point bond nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric, and composite nonwoven fabrics laminated with spunbond nonwoven fabric / melt blow nonwoven fabric, spunbond nonwoven fabric / melt blow nonwoven fabric / spunbond nonwoven fabric. be able to. Of these non-woven fabrics, it is preferable to use an air-through non-woven fabric that is easily bulky.

  In addition, at least one base nonwoven fabric 2 is raised by performing raising treatment on the surface of one side. Here, each of the two base nonwoven fabrics 2 may be subjected to raising treatment, or any one of them may be subjected to raising treatment. FIG. 1 shows a mode in which raising treatment is performed on two base nonwoven fabrics 2, and FIG. 2 shows a mode in which raising treatment is performed on one base nonwoven fabric 2. In addition to the original bulkiness of the nonwoven fabric, appropriate softness is imparted to the base nonwoven fabric 2 by the raising treatment, and the wearing feeling can be improved.

  By the way, in the process of passing hot air at the time of manufacturing the air-through nonwoven fabric, the surface that is not in contact with the drum or the conveyor belt is characterized by being bulky. Therefore, it is easy to carry the superabsorbent polymer 3 on the bulky surface of the air-through nonwoven fabric, and the air-through nonwoven fabric is easier to fix and carry the superabsorbent polymer 3 than other nonwoven fabrics. Therefore, when the base nonwoven fabric 2 is an air-through nonwoven fabric, it is preferable that the superabsorbent polymer 3 is fixedly supported between the respective bulky surfaces. By raising the hair, the superabsorbent polymer 3 can be more easily fixed and supported, and more superabsorbent polymer 3 can be distributed. Therefore, from the viewpoint of improving the absorbability, it is preferable that each of the two base nonwoven fabrics 2 is subjected to raising treatment, and the superabsorbent polymer 3 is fixedly supported on the raised surface of the base nonwoven fabric 2.

  Here, in the manufacturing process of the superabsorbent sheet 1 to be described later, in the case where each of the two base nonwoven fabrics 2 is subjected to raising treatment, two devices for raising treatment must be installed. In some cases, this may lead to a problem of installation space. Therefore, when the base nonwoven fabric 2 is an air-through nonwoven fabric, any one of the two base nonwoven fabrics 2 is not subjected to raising treatment, and is not subjected to raising treatment. Even if the superabsorbent polymer 3 is fixedly supported between the bulky surface and the raised surface of the substrate nonwoven fabric 2 that has been subjected to the raising treatment, the balance between the absorption performance and the economic aspect is favorably maintained. Is excellent.

The thickness of the base nonwoven fabric 2 is preferably 0.3 mm or more and 5.0 mm or less from the viewpoint of a balance between wearing feeling and absorption performance. The basis weight of the base nonwoven fabric 2 is preferably 20 g / m ² or more and 90 g / m ² or less, and more preferably 40 g / m ² or more and 70 g / m ² or less. Easily deformed by tension applied in the treatment process is smaller than 20 g / m ^2, the production efficiency is remarkably lowered, since greater than 90 g / m ² becomes high absorbent sheet 1 too thick, be embedded in an absorbent article When this happens, the wearer tends to feel uncomfortable.

  Furthermore, the thickness of the fibers constituting the base nonwoven fabric 2 is preferably 1.6 dtex or more and 14 dtex or less, more preferably 1.8 dtex or more and 9.0 dtex or less, and 2.0 dtex or more and 6.0 dtex or less. More preferably it is. In this way, by adjusting the thickness of the fibers constituting the base nonwoven fabric 2 within the above range, the superabsorbent polymer 3 can be dispersed between the raised fibers of the base nonwoven fabric 2 so as to be easily fixed and supported. it can.

  An adhesive is applied to the raised surface of the base nonwoven fabric 2. By applying the adhesive to the raised surface of the base nonwoven fabric 2, the state in which the superabsorbent polymer 3 is fixedly supported can be maintained. The type of the adhesive is not particularly limited as long as it can support the superabsorbent polymer 3, but a hot-melt adhesive having high versatility is preferable. As hot-melt adhesives, synthetic rubbers such as styrene-butadiene-styrene copolymers and styrene-isoprene-styrene copolymers having a melting point of 100 ° C. or higher and 180 ° C. or lower, or ethylene-vinyl acetate copolymers An olefin-based hot melt adhesive such as can be used. As a method for applying the hot melt adhesive, known methods such as a curtain coating method in which a molten hot melt adhesive is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which a contact manner is applied can be used. The amount of the adhesive applied per unit area of the superabsorbent polymer 3 in order to prevent the stain due to the transfer to each roll in the production process while securing the coating amount for fixing and supporting the superabsorbent polymer 3. The weight is preferably 5% or more and 30% or less.

(Super absorbent polymer)
The superabsorbent polymer 3 is not particularly limited as long as it absorbs urine and can prevent backflow. Sodium polyacrylate, polyaspartate, (starch-acrylic acid) graft copolymer , (Acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified products thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. The basis weight of the superabsorbent polymer 3, in order to ensure the absorption performance required for various absorbent articles, it is preferable that the 200 g / m ² or more 900 g / m ² or less. Moreover, it is more preferable that the basic weight of the superabsorbent polymer 3 is 300 g / m ² or more and 600 g / m ² or less from the viewpoint of further improving the absorption performance, the feel after absorption, and the ease of movement of the wearer.

  In addition, by avoiding fine powder having poor fluidity as a powder, the basic performance related to absorption is enhanced, and from the viewpoint of reducing the harsh tactile sensation that occurs when the superabsorbent sheet 1 becomes hard, it is highly absorbent. The median particle diameter of the conductive polymer 3 is preferably 50 μm or more and 600 μm or less, and more preferably 100 μm or more and 500 μm or less.

(Hydrophilic sheet)
In order to prevent the superabsorbent polymer 3 that is not fixed from the cross section of the superabsorbent sheet 1 from flowing out, it is preferable that the superabsorbent sheet 1 of the present invention is entirely wrapped with the hydrophilic sheet 4. Moreover, the touch at the time of wear can also be improved because the whole is wrapped with the hydrophilic sheet | seat 4. FIG. As shown in FIG.1 and FIG.2, the whole may be wrapped by the hydrophilic sheet | seat 4 being folded, the hydrophilic sheet | seat 4 is previously stuck to each of the two base nonwoven fabrics 2, and in that state The superabsorbent sheet 1 may be produced.

Examples of the hydrophilic sheet 4 include hydrophilic nonwoven fabrics such as tissue, absorbent paper, spunbond nonwoven fabrics, and airlaid nonwoven fabrics. From the viewpoint of availability and cost, it is preferable to use a hydrophilic nonwoven fabric or tissue. The basis weight of the conductive sheet 4 is preferably 7 g / m ² or more and 45 g / m ² or less, and more preferably 8 g / m ² or more and 15 / m ² or less. The hydrophilic sheet 4 is preferably fixed by hot melt adhesive or hot embossing.

(Manufacturing method of super absorbent sheet)
The manufacturing method of the superabsorbent sheet 1 of this invention is demonstrated. Here, as described above, in the superabsorbent sheet 1 of the present invention, each of the two base nonwoven fabrics 2 may be subjected to raising treatment, or any one of them may be subjected to raising treatment. Good. The method for producing the superabsorbent sheet 1 of the present invention will be described separately for the case where the raising treatment is performed on each of the two base nonwoven fabrics 2 and the case where any one is subjected to the raising treatment. In describing the manufacturing method of the superabsorbent sheet 1, each of the base nonwoven fabrics 2 is described as a first base nonwoven fabric and a second base nonwoven fabric.

  First, the manufacturing method of the superabsorbent sheet 1 in the case where any one of the base nonwoven fabrics 2 is subjected to raising treatment will be described. The first base nonwoven fabric to be raised is rotated in the same direction as the line at a rotational speed V2 slower than the line speed V1 of the first base nonwoven fabric, and the blade tip is raised by a rotary blade that contacts the surface of the first base nonwoven fabric. The Raising occurs due to the load on the first non-woven fabric from the blade edge caused by the speed difference between V1 and V2. On the other hand, an adhesive is applied to the bulky surface of the second base nonwoven fabric. After the adhesive is applied to the raised surface of the first base nonwoven fabric, it is pasted with the second base nonwoven fabric that has not been subjected to the raising treatment. At this time, the superabsorbent polymer 3 is quantitatively inserted between the first base nonwoven fabric and the second base nonwoven fabric, and the superabsorbent sheet 1 can be manufactured by wrapping with the hydrophilic sheet 4. The hydrophilic sheet 4 and the base nonwoven fabric 2 are bonded by hot melt.

  Next, the manufacturing method of the superabsorbent sheet 1 in the case where the raising treatment is performed on each of the two base nonwoven fabrics 2 will be described. The method up to the raising treatment is the same as described above. After the adhesive is applied to the raised surfaces of the first base nonwoven fabric and the second base nonwoven fabric that have been raised, the superabsorbent polymer 3 is quantitatively inserted, and the raised surfaces are The superabsorbent sheet 1 can be manufactured by being bonded so as to face each other.

  The method for spraying the superabsorbent polymer 3 between the base nonwoven fabrics 2 is not particularly limited, and a known feeder that can be used for powders such as a screw feeder, a rotary feeder, and a vibration feeder can be used. For example, it is preferable to use the method disclosed in Japanese Patent No. 6180215 because a large amount of the superabsorbent polymer 3 can be stably supplied at a high speed.

  The superabsorbent sheet 1 produced in this way is sandwiched between the top sheet and the back sheet of the absorbent article as an absorbent body and incorporated into the absorbent article. Since the superabsorbent sheet 1 is cut in accordance with the size of the absorbent article to be finally incorporated, in the process of producing the superabsorbent sheet 1, the flow direction according to the cut width L as shown in FIG. It is preferable to provide the superabsorbent polymer non-insertion part 100 and the superabsorbent polymer insertion part 200.

<Absorbent article>
Another embodiment of the present invention is an absorbent article including the superabsorbent sheet 1 of the present invention. As an absorbent article, regardless of whether it is for adults or infants, various types such as a tape type paper diaper, a pants type paper diaper, a urine picking pad, a light incontinence pad and the like can be mentioned. The absorbent article includes a liquid-permeable top sheet disposed on the body side, a liquid-impermeable back sheet disposed opposite the top sheet, and a high sheet disposed between the top sheet and the back sheet. An absorbent sheet 1. Thereby, an absorber becomes a structure pinched | interposed between a top sheet and a back sheet, and bodily fluids, such as urine, are absorbed by an absorber through a top sheet. In addition, a three-dimensional gather, a leg gather, a waist gather, a side flap, etc. can be suitably provided according to the use and type of an absorbent article. In addition, you may incorporate any base nonwoven fabric 2 among the two base nonwoven fabrics 2 so that it may become the skin contact surface side of the wearer of an absorbent article.

(Top sheet)
The top sheet allows body fluid to pass quickly toward the superabsorbent sheet 1 and is disposed to face the back sheet with the absorber interposed therebetween. Since the top sheet becomes a sheet that comes into contact with the skin, the top sheet has a soft touch and has a property that does not irritate the skin, such as synthetic fibers such as polypropylene and polyethylene, regenerated fibers such as rayon, Opening of hydrophilic non-woven fabric obtained by known processing methods such as air-through method, thermal bond method, spun lace method, spun bond method, composite non-woven fabric laminated with these, natural polyethylene fibers such as cotton, open polyethylene film, etc. A foam film such as an adhesive film or urethane foam can be used. In addition, the top sheet may be embossed or perforated to improve liquid permeability. As a method for performing these embossing and perforating processes, a known method can be carried out without limitation. In order to reduce irritation to the skin, the top sheet may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like.

From the viewpoint of strength, workability, and liquid return amount, the basis weight of the top sheet is preferably 15 g / m ² or more and 200 g / m ² or less. Although there is no restriction | limiting in particular as a shape of a top sheet, What is necessary is just the shape which covers the superabsorbent sheet 1 required in order to guide a bodily fluid to an absorber so that there may be no leakage.

(Back sheet)
The back sheet may be formed using a base material having liquid impermeability so that the body fluid held by the absorbent does not wet the clothing, and a resin film or a composite of a resin film and a nonwoven fabric laminated. It is formed from a material such as a sheet. The nonwoven fabric used for the composite sheet is not particularly limited in the production method. For example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunbond nonwoven fabric / meltblown nonwoven fabric, a composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric, and these Examples include composite materials. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet is preferably 15 g / m ² or more and 40 g / m ² or less. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable to give air permeability to a back sheet. In order to provide the back sheet with air permeability, for example, a filler may be blended in the resin film of the base material, or the back sheet may be embossed for perforation. In addition, calcium carbonate can be mentioned as a filler, The compounding method can perform a well-known method without a restriction | limiting.

<Method for producing absorbent article>
As a manufacturing method of an absorbent article, the superabsorbent sheet 1 obtained as described above is sandwiched between a top sheet and a back sheet, and the top sheet and the back sheet are partially or entirely covered. It can be manufactured by fixing using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing or the like. And after individually wrapping this in a package, what is necessary is just to fold it into three in the longitudinal direction and fold it. Moreover, a three-dimensional gather, a leg gather, a waist gather, a side flap, etc. can be provided as needed. In particular, in the case of an absorbent article having a large area, such as a tape-type paper diaper, a pants-type paper diaper, a urine removing pad, etc., it is preferable to combine the absorbent body and the superabsorbent sheet 1 made of fluff pulp and superabsorbent polymer 3. . In that case, the superabsorbent sheet 1 may be overlaid either above or below the absorbent body composed of flap pulp and superabsorbent polymer 3.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range of the invention as described in said embodiment, A various change or It will be apparent to those skilled in the art that improvements can be made. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the Example shown below at all.

(Examples 1 and 2)
First, as a first base nonwoven fabric and a second base nonwoven fabric, an air-through nonwoven fabric with a width dimension of 120 mm and a basis weight of 40 g / m ² is used as a superabsorbent polymer, a sodium polyacrylate-based superabsorbent. Using the polymer as a hydrophilic sheet, a spunbonded nonwoven fabric having a widthwise dimension of 290 mm and a basis weight of 8 g / m ² was prepared, and then the superabsorbent sheets of Examples 1 and 2 were prepared by the above-described manufacturing method. Got. The hot melt adhesive was applied to each of the first base nonwoven fabric and the second base nonwoven fabric at 1.5 g / m ² . The presence or absence of raising treatment in each base nonwoven fabric is shown in Table 1. In addition, 20 g of the superabsorbent polymer was inserted into a region of 10 cm in the width direction × 35 cm in the line direction at the center in the width direction of each of the first base nonwoven fabric and the second base nonwoven fabric. Moreover, it cut | disconnected so that the dimension of a longitudinal direction might be set to 40 cm in the center of the longitudinal direction of the superabsorbent polymer non-insertion part provided in the flow direction edge part of the superabsorbent polymer insertion part at intervals of 5 cm.
(Example 3)
An air-through nonwoven fabric having a width dimension of 120 mm and a basis weight of 90 g / m ² as the first substrate nonwoven fabric, and an air-through nonwoven fabric having a width dimension of 120 mm and a basis weight of 20 g / m ² as the second substrate nonwoven fabric. The superabsorbent sheet of Example 3 was obtained by the same method as in Example 1 and Example 2 except that only the first base nonwoven fabric was subjected to raising treatment.
(Comparative Examples 1 and 2)
Comparative Example 1 was the same as Example 1 except that none of the base nonwoven fabrics were subjected to raising treatment, and Comparative Example 2 was not provided with the second base nonwoven fabric. The superabsorbent sheets 1 and Comparative Example 2 were obtained.

(Evaluation method)
First, the hydrophilic sheet in contact with the first base nonwoven fabric was cut with scissors at three locations at a position where the hydrophilic sheet was divided into four equal parts in the longitudinal direction. Then, the weight of the superabsorbent polymer that had flowed into the stainless steel container was measured after shaking for 30 seconds by hand on a stainless steel container whose weight was measured in advance.

  As described above, according to the present invention, it is possible to obtain a superabsorbent sheet that is excellent in productivity and can maintain a state in which the superabsorbent polymer is fixedly supported.

DESCRIPTION OF SYMBOLS 1 Superabsorbent sheet 2 Base nonwoven fabric 3 Superabsorbent polymer 4 Hydrophilic sheet 100 Superabsorbent polymer non-insertion part 200 Superabsorbent polymer insertion part

Claims (5)

  A superabsorbent sheet in which a superabsorbent polymer is fixedly supported between two base non-woven fabrics, and at least one base non-woven fabric is raised on one side surface by being raised. A superabsorbent sheet in which an adhesive is applied to the raised surface of the base nonwoven fabric, and the superabsorbent polymer is quantitatively fixed and supported on the raised surface of the base nonwoven fabric.   The superabsorbent sheet according to claim 1, which is entirely wrapped with a hydrophilic sheet. The superabsorbent sheet according to claim 1, wherein the base nonwoven fabric has a basis weight of 20 g / m ² or more and 90 g / m ² or less. The two base nonwoven fabrics are air-through nonwoven fabrics,
A superabsorbent polymer is fixedly supported between the bulky surfaces of the two base nonwoven fabrics,
The superabsorbent sheet according to any one of claims 1 to 3, wherein a brushed surface is applied to any one of the bulky surfaces. An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and the superabsorbent sheet according to any one of claims 1 to 4 disposed between the top sheet and the back sheet. .