JP6972470B2 - Highly absorbent sheet and absorbent article comprising the highly absorbent sheet - Google Patents

Description

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

Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, whereby urine and the like are formed. The body fluid is absorbed by the absorber through the top sheet. There are various types of these absorbent articles, whether for adults or infants, depending on the application, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads. ..

For the absorbents constituting these absorbent articles, it was common to use fluff pulp and a super absorbent polymer (also referred to as SAP) in combination, but the feeling of wearing, appearance and touch when worn are generally used. A so-called superabsorbent sheet (also referred to as SAP sheet), which is composed of a base material and a superabsorbent polymer, may be used as an absorber for the purpose of improving the above and reducing the return of urine.

In such a highly absorbent sheet, the highly absorbent polymer moves due to the movement of the wearer when wearing the absorbent article provided with the highly absorbent sheet, and the distribution of the highly absorbent polymer becomes uneven, resulting in absorbability. There was a problem that it decreased. Further, especially in the high-absorbent sheet containing no fluff pulp, the high-absorbent polymer is fixed only by the adhesive, so that it becomes difficult to fix and support the high-absorbent polymer by the adhesive as the amount of the high-absorbent polymer increases. Therefore, it was difficult to maintain the highly absorbent polymer in a uniformly distributed state. Therefore, studies have been made on the fixed support of a highly absorbent polymer in a highly absorbent sheet.

As a highly absorbent sheet for which such an examination has been made, for example, Patent Document 1 describes a highly absorbent sheet containing no fluff pulp, and the high absorbent sheet is provided with two non-woven fabrics provided between the non-woven fabrics. A highly absorbent polymer is adhered by a network layer consisting of two upper and lower layers of hot melt adhesive, and only near the center in the thickness direction between the upper and lower layers of the hot melt adhesive. The highly absorbent sheet is characterized in that the two non-woven fabrics are partially welded to each other in the non-existent portion of the highly absorbent polymer, and the reticulated body layer has a large number of voids. Is disclosed.

Further, in Patent Document 2, a step of advancing the first non-woven layer whose first surface faces the suction chamber at a first speed and a step of advancing the first non-woven layer opposite to the first surface are described. It is movable with respect to the first non-woven layer having a difference in speed and the step of distributing the highly absorbent polymer on the second surface, and penetrates the first non-woven layer through the second surface. A method for producing a highly absorbent sheet is disclosed, which comprises a step of volumizing a first non-woven layer using a tooth portion to be formed.

Japanese Patent No. 3908403 Japanese Unexamined Patent Publication No. 2017-99855

However, in the highly absorbent sheet described in Patent Document 1, the highly absorbent polymer is fixedly supported on the network layer made of the hot melt adhesive, but when the highly absorbent polymer is fixedly supported by the network layer, it is produced. The speed slowed down and the production efficiency was not satisfactory.

Further, in the method for producing a highly absorbent sheet described in Patent Document 2, a method is disclosed in which a nonwoven fabric layer is volumized before and after distribution of a highly absorbent polymer on a nonwoven fabric, and a substrate nonwoven fabric is bonded to the nonwoven fabric. Since the highly absorbent polymer is present in the volumeized non-woven fabric without using an adhesive, the highly absorbent polymer may move during use.

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

The inventor of the present invention has conducted diligent research in view of the above problems. As a result, they have found that the above problems can be solved by devising the mode of the nonwoven fabric as the substrate and the method of fixing and supporting the highly absorbent polymer, and have completed the present invention. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a highly absorbent sheet in which a highly absorbent polymer is fixedly supported between two substrate nonwoven fabrics, and at least one substrate nonwoven fabric has a surface on one side. It is raised by being brushed, an adhesive is applied to the brushed surface of the substrate nonwoven fabric, and the highly absorbent polymer is quantitatively fixedly supported on the brushed surface of the substrate nonwoven fabric. , Highly absorbent sheet.

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

(3) The third aspect of the present invention is the highly absorbent sheet according to (1) or (2), and the substrate 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) The fourth aspect of the present invention is the highly absorbent sheet according to any one of (1) to (3), wherein the two substrate nonwoven fabrics are air-through nonwoven fabrics and the two substrate nonwoven fabrics. A highly absorbent polymer is fixedly supported between each of the bulky surfaces of the above, and one of the bulky surfaces is brushed.

(5) A fifth aspect of the present invention is any of (1) to (4) arranged between a liquid-permeable top sheet, a liquid-impermeable back sheet, and the top sheet and the back sheet. The highly absorbent sheet according to the above, and an absorbent article having.

The highly absorbent sheet of the present invention is a highly absorbent sheet in which a highly absorbent polymer is fixedly supported between two substrate nonwoven fabrics, and at least one substrate nonwoven fabric is brushed 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 highly absorbent polymer is quantitatively fixedly supported on the raised surface of the substrate nonwoven fabric. Therefore, it is possible to maintain a good state in which the highly absorbent polymer is fixedly supported. In addition, since the highly absorbent polymer is fixedly supported by the simple structure of brushing treatment and adhesive application, it is also excellent in productivity. Therefore, according to the present invention, it is possible to obtain a highly absorbent sheet which is excellent in productivity and can maintain a state in which a highly absorbent polymer is fixedly supported.

It is sectional drawing in the width direction of the high absorption sheet of this invention. It is sectional drawing in the width direction of the high absorption sheet of this invention. It is a figure which shows the embodiment which provided the highly absorbent polymer non-insertion part and the high-absorbent polymer insertion part in the flow direction according to the cut width.

<Highly absorbent sheet>
The highly absorbent sheet 1 is not particularly limited to various absorbent articles such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads, regardless of whether they are for adults or infants. It can be used as an absorber. In the description of the present specification, the longitudinal direction of the highly absorbent sheet 1 is the direction in which the substrate nonwoven fabric 2 runs during the production of the highly absorbent sheet 1. Further, the width direction of the high absorption sheet 1 is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by X in the drawing. Further, the thickness direction of the highly absorbent sheet 1 is indicated by Y in the figure.

1 and 2 are cross-sectional views in the width direction of the highly absorbent sheet 1. In the highly absorbent sheet 1 of the present invention, as shown in FIGS. 1 and 2, the highly absorbent polymer 3 is fixedly supported between two substrate nonwoven fabrics 2. Further, at least one substrate nonwoven fabric 2 is raised by being brushed on one side surface. An adhesive is applied to the surface to which the two substrate nonwoven fabrics 2 are bonded, and the highly absorbent polymer 3 is quantitatively fixedly supported on the raised surface to which the adhesive of the substrate nonwoven fabric 2 is applied. Therefore, the state in which the highly absorbent polymer 3 is fixedly supported can be maintained satisfactorily. In addition, since the highly absorbent polymer 3 is fixedly supported by a simple structure of brushing treatment and adhesive application, it is also excellent in productivity. When the highly absorbent sheet 1 is used as an absorber of the absorbent article, any of the two substrate nonwoven fabrics 2 is incorporated so as to be on the skin contact surface side of the wearer of the absorbent article. But it may be.

(Base non-woven fabric)
As described above, the highly absorbent polymer 3 is supported between the two substrate nonwoven fabrics 2. Examples of the substrate non-woven fabric 2 include non-woven fabrics such as air-through non-woven fabric, point-bonded non-woven fabric, spunbond non-woven fabric, and melt-blow non-woven fabric, and composite non-woven fabric in which spunbond non-woven fabric / melt-blow non-woven fabric, spunbond non-woven fabric / melt-blow non-woven fabric / spunbond non-woven fabric are laminated. be able to. Of these non-woven fabrics, it is preferable to use an air-through non-woven fabric that is easy to obtain bulkiness.

Further, at least one substrate nonwoven fabric 2 is raised by being brushed on one side surface. Here, each of the two substrate nonwoven fabrics 2 may be brushed, or any one of them may be brushed. FIG. 1 shows an embodiment in which two substrate nonwoven fabrics 2 are brushed, and FIG. 2 shows an embodiment in which one substrate nonwoven fabric 2 is brushed. By the brushing treatment, the substrate nonwoven fabric 2 is imparted with appropriate softness in addition to the original bulkiness of the nonwoven fabric, and the wearing feeling can be improved.

By the way, in the process of passing hot air during the production of the air-through nonwoven fabric, the surface not in contact with the drum or the transport belt has a feature of being bulky. Therefore, the highly absorbent polymer 3 is easily supported on the bulky surface of the air-through nonwoven fabric, and the air-through nonwoven fabric is easier to fix and support the highly absorbent polymer 3 as compared with other nonwoven fabrics. Therefore, when the substrate nonwoven fabric 2 is an air-through nonwoven fabric, it is preferable that the highly absorbent polymer 3 is fixedly supported between the bulky surfaces thereof. The brushing treatment makes it easier to fix and support the highly absorbent polymer 3, and it becomes possible to distribute a larger amount of the highly absorbent polymer 3. Therefore, from the viewpoint of improving the absorbability, it is preferable that each of the two substrate nonwoven fabrics 2 is brushed, and the highly absorbent polymer 3 is fixedly supported on the brushed surface of the substrate nonwoven fabric 2.

Here, in the manufacturing process of the highly absorbent sheet 1 described later, when the raising treatment is applied to each of the two substrate nonwoven fabrics 2, two devices for raising the raising treatment must be installed, which is costly. And it may lead to the problem of installation space. Therefore, when the substrate nonwoven fabric 2 is an air-through nonwoven fabric, one of the two substrate nonwoven fabrics 2 is not brushed and the substrate nonwoven fabric 2 is not brushed. Even if the highly absorbent polymer 3 is fixedly supported between the bulky surface and the raised surface of the brushed substrate nonwoven fabric 2, a good balance between absorption performance and economic aspects is maintained. Is excellent.

The thickness of the substrate nonwoven fabric 2 is preferably 0.3 mm or more and 5.0 mm or less from the viewpoint of the balance between wearing feeling and absorption performance. The basis weight of the substrate 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. If it is smaller than 20 g / m ² , it is easily deformed by the tension applied in the processing process, and the manufacturing efficiency is significantly lowered. If it ^{is larger than 90 g / m 2} , the highly absorbent sheet 1 becomes too thick, so it is used by incorporating it into an absorbent article. When this happens, the wearer tends to feel uncomfortable.

Further, the thickness of the fibers constituting the substrate 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. It is more preferable to have. By adjusting the thickness of the fibers constituting the base nonwoven fabric 2 in the above range in this way, the highly absorbent polymer 3 can be dispersed between the fibers of the raised portion of the substrate nonwoven fabric 2 to facilitate fixing and supporting. can.

An adhesive is applied to the raised surface of the substrate nonwoven fabric 2. By applying the adhesive to the raised surface of the substrate nonwoven fabric 2, the highly absorbent polymer 3 can be maintained in a fixed and supported state. The type of the adhesive is not particularly limited as long as it can support the highly absorbent polymer 3, but a highly versatile hot melt adhesive is preferable. As the hot melt adhesive, a synthetic rubber-based polymer such as a styrene-butadiene-styrene-based copolymer, a styrene-isoprene-styrene-based copolymer, or an ethylene-vinyl acetate copolymer having a melting point of 100 ° C. or higher and 180 ° C. or lower, or an ethylene-vinyl acetate copolymer. Styrene-based hot melt adhesives such as the above can be used. As a method for applying the hot melt adhesive, known methods such as a curtain coat method in which the hot melt adhesive in a molten state is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which the hot melt adhesive is applied by a contact method can be used. The amount of the adhesive applied is per unit area of the highly absorbent polymer 3 in order to prevent stains due to transfer to each roll in the manufacturing process while ensuring a coating amount for fixing and supporting the highly absorbent polymer 3. It is preferably 5% or more and 30% or less of the weight of the product.

(Highly absorbent polymer)
The highly absorbent polymer 3 is not particularly limited as long as it can absorb urine and prevent backflow, and is a sodium polyacrylate-based, polyasparaginate-based, or (starch-acrylic acid) graft copolymer. , (Acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and those formed from materials such as a saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. Further, the basis weight of the highly absorbent polymer 3 is preferably ^{200 g / m 2} or more and 900 g / m ² or less in order to secure the absorption performance required for various absorbent articles. Further, from the viewpoint of further improving the absorption performance, the feel after absorption and the ease of movement of the wearer, the basis weight of the highly absorbent polymer 3 is more preferably ^{300 g / m 2} or more and 600 g / m ^{2 or less.}

Further, from the viewpoint of improving the basic performance regarding absorption by avoiding fine powder having poor fluidity as a powder and reducing the rugged tactile sensation generated by the hardening of the highly absorbent sheet 1, high absorption is achieved. The medium particle size of the sex 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)
It is preferable that the high-absorbent sheet 1 of the present invention is entirely wrapped with the hydrophilic sheet 4 in order to prevent the high-absorbent polymer 3 which is not fixed from the cross section of the high-absorbent sheet 1 from flowing out. Further, since the entire surface is wrapped with the hydrophilic sheet 4, the feel when worn can be improved. As shown in FIGS. 1 and 2, the entire surface may be wrapped by folding the hydrophilic sheet 4, or the hydrophilic sheet 4 may be attached to each of the two substrate nonwoven fabrics 2 in advance, and in that state. The highly absorbent sheet 1 may be produced.

Examples of the hydrophilic sheet 4 include hydrophilic non-woven fabrics such as tissue, absorbent paper, spunbonded nonwoven fabric and airlaid nonwoven fabric, and it is preferable to use hydrophilic nonwoven fabric or tissue from the viewpoint of availability and cost, and hydrophilicity is preferable. The basis weight of the sex 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. It is preferable to fix the hydrophilic sheet 4 by hot melt adhesive or heat embossing.

(Manufacturing method of highly absorbent sheet)
The method for producing the highly absorbent sheet 1 of the present invention will be described. Here, as described above, in the highly absorbent sheet 1 of the present invention, each of the two substrate nonwoven fabrics 2 may be brushed, or any one of them may be brushed. good. The method for producing the highly absorbent sheet 1 of the present invention will be described separately for the case where each of the two substrate nonwoven fabrics 2 is brushed and the case where one of the two substrate nonwoven fabrics is brushed. In addition, in explaining the manufacturing method of the highly absorbent sheet 1, each substrate nonwoven fabric 2 is described as a first substrate nonwoven fabric and a second substrate nonwoven fabric.

First, a method for producing the highly absorbent sheet 1 in the case where any one of the substrate nonwoven fabrics 2 is brushed will be described. The first substrate nonwoven fabric to be brushed is rotated in the same direction as the line at a rotation speed V2 slower than the line speed V1 of the first substrate nonwoven fabric, and is brushed by a rotary blade whose cutting edge is in contact with the surface of the first substrate nonwoven fabric. NS. Raising occurs due to the load on the first substrate nonwoven fabric from the cutting edge caused by the speed difference between V1 and V2. On the other hand, the adhesive is applied to the bulky surface of the second substrate nonwoven fabric. After the adhesive is applied to the raised surface of the first substrate nonwoven fabric, it is attached to the second substrate nonwoven fabric that has not been brushed. At this time, the highly absorbent polymer 3 is quantitatively inserted between the first substrate nonwoven fabric and the second substrate nonwoven fabric, and further wrapped in the hydrophilic sheet 4 to produce the highly absorbent sheet 1. The hydrophilic sheet 4 and the substrate nonwoven fabric 2 are adhered by hot melt.

Next, a method for producing the highly absorbent sheet 1 in the case where each of the two substrate nonwoven fabrics 2 is brushed will be described. The method up to the raising treatment is the same as above. After the adhesive is applied to the raised surfaces of the first substrate nonwoven fabric and the second substrate nonwoven fabric that have been brushed, the highly absorbent polymer 3 is quantitatively inserted, and the brushed surfaces are brought together. The highly absorbent sheet 1 can be manufactured by being bonded so as to face each other.

The method of spraying the highly absorbent polymer 3 between the substrate nonwoven fabric 2 is not particularly limited, and a known feeder that can be used for powder 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 highly absorbent polymer 3 can be stably supplied at high speed.

The highly absorbent sheet 1 thus produced 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 highly absorbent sheet 1 is cut according to the size of the absorbent article to be finally incorporated, in the process of producing the highly absorbent sheet 1, as shown in FIG. 3, the flow direction is adjusted to the cut width L. It is preferable to provide a highly absorbent polymer non-inserted portion 100 and a highly absorbent polymer inserted portion 200.

<Absorbent article>
Another embodiment of the present invention is an absorbent article comprising the highly absorbent sheet 1 of the present invention. Examples of the absorbent article include various types depending on the application, such as a tape type disposable diaper, a pants type disposable diaper, a urine absorbing pad, and a light incontinence pad, regardless of whether they are for adults or infants. The absorbent article is a liquid-permeable top sheet arranged on the body side, a liquid-impermeable back sheet arranged facing the top sheet, and a height arranged between the top sheet and the back sheet. The absorbent sheet 1 is provided. As a result, the absorber has a structure sandwiched between the top sheet and the back sheet, and body fluid such as urine is absorbed by the absorber through the top sheet. In addition, three-dimensional gathers, leg gathers, waist gathers, side flaps and the like can be appropriately provided depending on the use and type of the absorbent article. Of the two substrate nonwoven fabrics 2, any of the substrate nonwoven fabrics 2 may be incorporated so as to be on the skin contact surface side of the wearer of the absorbent article.

(Top sheet)
The top sheet allows the body fluid to quickly pass toward the highly absorbent sheet 1, and is arranged so as to face the back sheet with the absorbent body interposed therebetween. Since the top sheet is a sheet that comes into contact with the skin, the top sheet has the property of having a soft feel and not irritating the skin, synthetic fibers such as polypropylene and polyethylene, and recycled fibers such as rayon. Openings of hydrophilic non-woven fabrics obtained by known processing methods such as air-through method, thermal bond method, spunlace method, spunbond method, etc. using natural fibers such as cotton, composite non-woven fabrics laminated with these, open polyethylene film, etc. A synthetic film, a foamed film such as urethane foam, or the like can be used. Further, the surface of the top sheet may be embossed or perforated in order to improve the liquid permeability. As a method for performing these embossing and drilling processes, known methods can be carried out without limitation. Further, 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 moisturizer 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. The shape of the top sheet is not particularly limited, but may be any shape that covers the highly absorbent sheet 1 required for guiding the body fluid to the absorber so as not to leak.

(Back sheet)
The back sheet may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber does not wet the clothes, and may be a resin film or a composite in which a resin film and a non-woven fabric are laminated. It is formed from a material such as a sheet. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method, for example, spunbonded non-woven fabric, melt-blow non-woven fabric, spunbonded non-woven fabric / melt-blow non-woven fabric, spunbonded non-woven fabric / melt-blow non-woven fabric / composite non-woven fabric in which spunbonded non-woven fabric is laminated, 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. Further, in order to prevent stuffiness during mounting, it is preferable to give the back sheet breathability. In order to provide the back sheet with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet may be embossed for perforation. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Manufacturing method of absorbent articles>
As a method for manufacturing an absorbent article, the highly absorbent sheet 1 obtained as described above is sandwiched between the top sheet and the back sheet, and the top sheet and the back sheet are partially or completely covered. It can be manufactured by fixing with a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, or the like. Then, after individually packaging this in a package, it may be folded in three in the longitudinal direction and folded. Further, three-dimensional gathers, leg gathers, waist gathers, side flaps and the like can be provided as needed. Further, particularly for absorbent articles having a large area such as tape-type disposable diapers, pants-type disposable diapers, and urine absorbing pads, it is preferable to combine an absorbent body made of fluff pulp and a highly absorbent polymer 3 with a highly absorbent sheet 1. .. In that case, the highly absorbent sheet 1 may be layered on either the top or the bottom of the absorbent body composed of the flap pulp and the highly absorbent polymer 3.

Although the present invention has been described above with reference to the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. It is also clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

(Example 1 and reference example 1 )
First, as the first substrate nonwoven fabric and the second substrate nonwoven fabric, an air-through nonwoven fabric having a width dimension of 120 mm and a basis weight of 40 g / m ² is used as a highly absorbent polymer and has high absorbency of a commercially available sodium polyacrylate. Using the polymer as a hydrophilic sheet, spunbonded nonwoven fabrics having a width dimension of 290 mm and a basis weight of 8 g / m ² were prepared, respectively, and then, by the above-mentioned production method, high absorption of Example 1 and Reference Example 1 was performed. Obtained a sex sheet. The hot melt adhesive was applied to each of the first substrate nonwoven fabric and the second substrate nonwoven fabric at 1.5 g / m ² . The presence or absence of the raising treatment in each substrate nonwoven fabric is shown in Table 1. Further, 20 g of the highly absorbent polymer was inserted into a region of 10 cm in the width direction × 35 cm in the line direction at the central portion in the width direction of each of the first substrate nonwoven fabric and the second substrate nonwoven fabric. Further, it was cut so that the dimension in the longitudinal direction was 40 cm at the center of the longitudinal direction of the portion in which the highly absorbent polymer was not inserted, which was provided at intervals of 5 cm from the end of the highly absorbent polymer inserted portion in the flow direction.
( Reference example 2 )
As the first substrate nonwoven fabric, an air-through nonwoven fabric having a width direction dimension of 120 mm and a basis weight of 90 g / m ² is used, and as a second substrate nonwoven fabric, an air-through nonwoven fabric having a width direction dimension of 120 mm and a basis weight of 20 g / m ² is used. The highly absorbent sheet of Reference Example 2 was obtained by the same method as in Example 1 and Reference Example 1 except that only the first substrate nonwoven fabric was brushed.
(Comparative Examples 1 and 2)
Comparative Example 1 was subjected to the same method as in Example 1 except that none of the substrate nonwoven fabrics was brushed and Comparative Example 2 was not provided with the second substrate nonwoven fabric. Highly absorbent sheets of No. 1 and Comparative Example 2 were obtained.

(Evaluation method)
First, the hydrophilic sheet in contact with the first substrate nonwoven fabric was cut with scissors at three positions at positions that divide it into four equal parts in the longitudinal direction. Then, on a stainless steel container whose weight was measured in advance, the cut end was turned down and the polymer was shaken by hand for 30 seconds, and then the weight of the highly absorbent polymer flowing out into the stainless steel container was measured.

From the above, according to the present invention, it is possible to obtain a highly absorbent sheet which is excellent in productivity and can maintain a state in which a highly absorbent polymer is fixedly supported.

1 Highly absorbent sheet 2 Base non-woven fabric 3 Highly absorbent polymer 4 Hydrophilic sheet 100 Highly absorbent polymer uninserted part 200 Highly absorbent polymer inserted part

Claims (2)

A highly absorbent sheet in which a highly absorbent polymer is fixedly supported between two substrate nonwoven fabrics, and at least one substrate nonwoven fabric is raised by being brushed on one side surface. An adhesive is applied to the raised surface of the substrate nonwoven fabric, and the highly absorbent polymer is quantitatively fixedly supported on the raised surface of the substrate nonwoven fabric .
The whole is wrapped by a hydrophilic sheet,
The substrate non-woven fabric has a basis weight of 40 g / m ² or more and 70 g / m ² or less, the hydrophilic sheet has a basis weight of 8 g / m ² or more and 15 g / m ² or less, and the highly absorbent polymer has a basis weight of 300 g / m ^2. More than 600 g / m ² or less,
The two substrate non-woven fabrics are air-through non-woven fabrics.
A highly absorbent polymer is fixedly supported between the bulky surfaces of each of the two substrate nonwoven fabrics.
A highly absorbent sheet with both bulky surfaces brushed. Absorbent article having a liquid permeable topsheet, a liquid impermeable backsheet, and a highly absorbent sheet according to claim 1 disposed between the topsheet and the backsheet, the.

Images