Water absorbent sheet

A water-absorbing sheet and water-absorbing technology, applied in the field of water-absorbing sheet, can solve the problems of leakage, the absorption performance may not show sufficient effect, etc., and achieve the effect of realizing leakage, avoiding the phenomenon of gel blocking, and realizing the phenomenon of gel blocking.

Active Publication Date: 2012-11-28
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Absorbers with the above-mentioned structure may not have improved performance in conventional products with a high ratio of hydrophilic fibers, but the current development trend is to reduce the ratio of hydrophilic fibers and increase the ratio of water-absorbent resin. In this case, the liquid to be absorbed may flow along grooves or creases until the liquid to be absorbed is absorbed, which may cause leakage and may not necessarily exhibit sufficient effects in terms of absorption performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] Add 55 parts by mass of ethylene-vinyl acetate copolymer (melting point 95° C., median particle size: 200 μm ), and 270 parts by mass of sodium polyacrylate cross-linked product A (manufactured by Sumitomo Seika Co., Ltd., Accurate SA55SX-11, median particle size: 360 μm, physiological saline water absorption speed: 42 seconds, physiological Salt water retention capacity: 35 g / g, abbreviated as "resin A" in the table) the mixture obtained by uniform mixing. On the other hand, lay a 30 cm wide nonwoven fabric A (rayon spunlace nonwoven fabric with a weight per unit area of ​​45 g / m2) on the conveyor belt at the lower part of the spreader. 2 , thickness: 400 μm, rayon content 100%), except image 3 All areas other than area A (width: 10 cm, interval between area A and B: 2 cm) are covered with paper. Then, the spreading roller and the lower conveyor belt are operated, so that the weight per unit area is 325 g / m 2 The above-mentioned mixture was uniformly laminated only...

Embodiment 2

[0141] Add 55 parts by mass of copolyester (melting point 80° C., median particle size: 150 μm) and 270 parts by mass of The resulting mixture was uniformly mixed with the cross-linked sodium polyacrylate A as a water-absorbent resin. On the other hand, lay a 30 cm wide nonwoven fabric C (rayon-PET spunlace nonwoven fabric with a weight per unit area of ​​50 g / m2) on the conveyor belt at the lower part of the spreader. 2 , thickness: 500 μm, rayon content 70%, PET content 30%), except Figure 4 All areas other than area C (width: 10 cm, interval between area C and D: 2 cm) were covered with paper. Then the spreader roller and the lower conveyor belt are run, so that the weight per unit area is 325 g / m 2 The above-mentioned mixture was uniformly laminated only at the region C of the above-mentioned nonwoven fabric.

[0142] The laminate was once again carefully laid down on the roller spreader belt, taking care not to shift the mixture, and then placed on Figure 4 Cover wi...

Embodiment 3

[0147] A nonwoven fabric C with a width of 30 cm was spread on a hot-melt coater (manufactured by Harries Co., Ltd.: Marshall 150) with the heating temperature set at 150°C, and then styrene-butadiene was coated on the nonwoven fabric. - Styrenic block copolymer (SBS, softening point 85° C.) as binder. The coating method is right Figure 4 The area C shown is based on a weight per unit area of ​​20 g / m 2 , a line width of 100 μm, and a weight per unit area of ​​5 g / m for area D 2 , Line width 60 μm for coating.

[0148] The cross-linked sodium polyacrylate A as a water-absorbent resin was charged into a feed port of a roll spreader (manufactured by Hashima Co., Ltd., Synter Ace M / C). On the other hand, the above-mentioned nonwoven fabric coated with adhesive is spread on the conveyor belt at the lower part of the spreader, except Figure 4 Areas other than C are covered with paper. Then, the spreader roller and the lower conveyor belt are operated, so that the weight per ...

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Abstract

The invention relates to a water absorbent sheet having a structure wherein an absorbent layer that contains a water absorbent resin and an adhesive is held between hydrophilic nonwoven fabrics. The water absorbent sheet is characterized by satisfying the conditions (1) and (2) described below, and having a structure wherein the absorbent layer is divided into a primary absorbent layer and a secondary absorbent layer by a base layer that is obtained by bonding and laminating two or more air-permeable bases using an adhesive. (1) The weight of the base layer is not less than 25 g / m<2>. (2) The adjacent air-permeable bases are bonded together with 0.1-50 g / m<2> of the adhesive. The water absorbent sheet can be formed thin and prevents a gel blocking phenomenon and liquid leakage, while securing the fundamental properties required for water absorbent sheets at high levels, even though the water absorbent sheet contains extremely little pulp.

Description

technical field [0001] The present invention relates to a thin water-absorbent sheet usable in the field of hygienic materials and the like. More specifically, it relates to a water-absorbent sheet with very little pulp, which has high absorbency despite being thin, and is applicable to absorbent articles such as paper diapers and incontinence pads. Moreover, this invention relates to the absorbent article which used this water-absorbent sheet. The present invention further relates to a method for efficiently producing the above-mentioned water-absorbent sheet with stable performance. Background technique [0002] Absorbent articles for body fluids represented by paper diapers have a structure in which an absorbent body for absorbing liquids such as body fluids is arranged on a soft liquid-permeable surface sheet (top sheet) on the body contact side, and an absorbent body arranged on the side opposite to the body. The liquid impermeable backsheet (backsheet) on the opposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/49A61F13/53
CPCA61F2013/530554A61F13/535A61F13/539A61F13/53752A61F2013/15406A61F13/53409A61F13/15747A61F13/531A61F13/53713A61F13/15699A61F13/534A61L15/22A61F2013/530226
Inventor 上田耕士鄙山铁博津野修司半田昌良
Owner SUMITOMO SEIKA CHEM CO LTD
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