JPH0658931U - Laminate - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a laminate suitable as a sanitary napkin or an incontinence pad. [Structure] A first absorbent layer 2 is provided between a top sheet 1 and an intermediate sheet 3, and a second absorbent layer 4 is provided between a back sheet 5 and an intermediate sheet 3.
Of the water-absorbent resin particles having different particle size types in the two absorbent layers. Second
The powdery water-absorbent resin 10 constituting the absorber layer has the polyhydric alcohol 20 and the inorganic powder 30 attached thereto. [Effect] It was possible to improve the wet back while changing the absorption rate. It is possible to prevent gel blocking of the powdery water-absorbent resin to be the second absorbent layer and improve liquid permeability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated body having a liquid absorbing property that can be used as a sanitary napkin or an incontinence pad, and more particularly to a laminated body having a partially different liquid absorbing speed.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, there are absorbers in which water-absorbent resin particles are sandwiched between pulp, paper, and pulp non-woven fabric, or absorbers in which water-absorbent resin particles are sandwiched between cotton-like defibrated pulp layers and then compressed and integrated, but the wet back is large. In addition, the homogeneity and productivity are low, and because the liquid absorption speed is uniform, the water-absorbent resin particles close to the absorption surface absorb water and swell, forming a water-stop layer and effectively distant water-absorbent resin particles. It was not used.

Therefore, focusing on partially changing the liquid-absorbing speed of the laminate, it is an object of the present invention to exert a unique liquid-absorbing property which is thin, uniform, and good in productivity, which is not available in the conventional liquid-absorbing laminate. As the above, a laminate having two or more layers having different liquid absorbing properties was also proposed (Japanese Patent Application No. 3-98906). However, for the absorbent layer used in the laminate, the water-absorbent resin is easily gel-blocked, and a problem remains in the absorbability.

In view of the above, the present invention has an object to obtain a laminate having an absorber layer capable of preventing gel blocking of the water absorbent resin and further promoting the improvement of the water absorption rate.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the structure of the laminate according to the present invention includes a liquid-permeable top sheet, an intermediate sheet and a back sheet, and a first absorber layer and a back sheet between the top sheet and the intermediate sheet. It has a five-layer structure having a second absorbent layer between the intermediate sheets, and the first absorbent layer has a slow absorption speed and is formed of a powdery water-absorbent resin having a particle size of 150 to 1000 μm. Is formed of a powdery water-absorbent resin having a high absorption rate and a particle diameter of 30 to 150 μm, and the powdery water-absorbent resin constituting the second absorber layer is formed by adhering polyvalent alcohol and inorganic powder. It has a feature.

The amount of the polyhydric alcohol added to the powdery water-absorbent resin is preferably 0.5 to 7% by weight, and the inorganic powder is preferably 0.1 to 3% by weight.

[0007]

[Action]

 In the laminated body having the above structure, the absorbent layer is divided into two and the absorbent particles having different particle diameters and types are arranged in each of the absorbent layers to change the absorption rate and improve the wet back. I was able to. Further, by providing a liquid diffusion layer, which is an intermediate sheet made of rayon non-woven fabric, between the first absorbent layer and the second absorbent layer, the isolation layer can be fully utilized so that the characteristics of each water absorbent resin can be fully exhibited. I was able to hold the role of

Furthermore, by impregnating the polyhydric alcohol with the powdery water-absorbent resin, it prevents gel blocking of the powdery water-absorbent resin, improves the adhesiveness to other sheets when used in a laminate, and cuts the cut surface. It helps prevent the water-absorbent resin from falling off. Further, it is suitable for dispersing the powdery water-absorbent resin by impregnating the inorganic powder, and can improve the liquid permeability between the inorganic powders and the absorption rate.

[0009]

【Example】

Next, the constitutional requirements of each layer and sheet will be specifically described in each of the embodiments of the present invention. FIG. 1 shows a schematic sectional view, FIG. 2 shows a liquid transfer process, and FIG. 3 shows a schematic enlarged sectional view of a second absorber layer. First absorbent layer 2 Powdery water-absorbent resin having a particle size of 150 to 1000 μm, application amount is 15 to 40, preferably 25 to 35 g / m ² , gel strength is 200 or more (rheometer method) 4 second absorbent layer particles Powdery water-absorbent resin having a diameter of 30 to 150 μm, spray amount of 40 to 80, preferably 50 to 70 g / m ² , gel strength of 200 or more (rheometer method), surface sheet 1 long fiber pulp alone or rayon fiber mixed Paper having a basis weight of 16 to 40 g / m ² , a crepe ratio of 10 to 30% or an intermediate sheet of rayon paper 3 A basis weight of rayon fibers of at least 50% by weight of a hydrophilic non-woven fabric 15 to 40, preferably 20 to 30 g / m ² . nonwoven backsheet 5 short fibers and long fibers 1: pulp paper consisting of a mixture ratio of 1 and a basis weight 16-40 preferably clause 20~27g / m ^2, creping ratio 10-30% Further, Table Sheet may be better to use the long-fiber pulp or rayon fibers, it tends to be insufficient diffusion of the liquid in the other Material.

When the first absorber layer has a spray amount larger than this, the liquid does not transfer to the second absorber layer due to swelling when absorbing the liquid. On the other hand, if it is less than this, wet back is lowered. If the amount of the second absorbent layer is less than this, the amount of absorption is not sufficient and the absorption speed is slow. If it exceeds this, the absorption speed does not improve for the cost. FIG. 3 is an enlarged schematic sectional view of the absorbent layer of the present invention, in which 10 is a powdery water-absorbent resin, 20 is a polyhydric alcohol attached to the water-absorbent resin, and 30 is an inorganic powder similarly attached. There is.

The amount of polyhydric alcohol added to the powdery water-absorbent resin is preferably 0.5 to 7% by weight, and the inorganic powder is preferably 0.1 to 3% by weight. The particle size of the inorganic powder is preferably 10 μm or less. The polyhydric alcohol is preferably glycerin, propylene glycol, 1,3-butanediol, polyethylene glycol 400 to 2000, and the inorganic powder is silica, synthetic silicon, magnesium carbonate, magnesium silicate, calcium carbonate, titanium oxide. Etc. are preferred.

When an intermediate sheet such as a rayon nonwoven fabric is present, the liquid is sufficiently diffused and the characteristics of the two-type water absorbent resin can be fully exhibited. Cotton or rayon non-woven fabric may be used for the surface sheet 1 to enhance the primary trapping property. The following actions and specific effects can be expected by the above implementation.

Since the first absorbent layer is composed of resin particles having a low absorption rate and a large gel strength and a large particle size, the path is set before the liquid is absorbed by the second absorbent layer due to the swelling due to the liquid absorption of the resin. Prevents blockage or blockage of the path by external pressure or deformation of the gel. Since the second absorber layer is composed of resin particles having a high absorption rate and a small particle size, the liquid can be quickly drawn and trapped from the human body side to the farthest side. In addition, since a resin having a high gel strength and a small particle size is used, the liquid can be held uniformly on the plane of the sheet, gel blocking can be prevented, and the water absorbent resin can be effectively used.

By using a rayon-based non-woven fabric as the intermediate sheet, the liquid is diffused during the transfer of the liquid from the first absorbent layer to the second absorbent layer, and the water absorbent resin can be used over a wide range of the sheet. Since the manufacturing process is performed by stacking the sheet-shaped members, the productivity is high. The present invention has been able to solve the problem that the cotton-like pulp used in sanitary napkins and incontinence pads is not laminated as much as paper diapers, so that even if the production speed is increased, the uniformity of the application to the sheets cannot be obtained.

Since cotton-like pulp is not used, no dust is generated in the production process and the working environment is good. Next, a specific example will be given to compare with a comparative example. Examples 1 basis weight 20 g / m ² paper, powdery water absorbent resin 20 g / m ² of particle size 150～1000Myuemu, rayon nonwoven basis weight 20 g / m ^2, the powdery water-absorbent resin 50 g / m particle size 30~150μm ² and paper having a basis weight of 20 g / m ² were laminated in this order by embossing. Rayon paper embodiment 2 basis weight 30 g / m ^2, powdery water absorbent resins 20 g / m ² of particle size 150～1000Myuemu, rayon nonwoven basis weight 20 g / m ^2, powder powder water-absorbing resin having a particle size of 30~150μm The paper having a weight of 50 g / m ² and a basis weight of 20 g / m ² was laminated in this order by embossing. Comparative Example 1 50 g / m ² of powdery water-absorbent resin having a particle size of 150 to 1000 μm was sandwiched and integrated with a paper having a basis weight of 20 g / m ² . Comparative Example 2 A mixture of powdery water-absorbent resin having a particle size of 150 to 1000 μm and powdery water-absorbent resin having a particle size of 30 to 150 μm in a ratio of 1: 2 75 g / m ² is sandwiched between papers having a basis weight of 20 g / m ^2. Integrated. Comparative Example 3 50 g / m ² of powdery water-absorbent resin having a particle size of 30 to 150 μm was sandwiched and integrated with a paper having a basis weight of 20 g / m ² . Comparative Example 4 80 g / m ² of defibrated pulp and 50 g / m ² of powdery water-absorbent resin having a particle size of 150 to 1000 μm were sandwiched and integrated with a paper having a basis weight of 20 g / m ² .

The absorption rate by artificial menstrual blood, the wet back, and the sheet thickness of the above articles were measured (see Table 1). Absorption rate: The time required to drop artificial menstrual blood onto a 0.2 cc sheet and draw it inside from the sheet surface. Wet back: 0.2 cc of artificial menstrual blood is dropped for 1 minute and then the tissue is pressed down and the return is observed. * Artificial menstrual blood Celtrol 0.40% Glycerin 10.00% NaCl 1.00% Na ₂ CO ₃ 0.40% Ion-exchanged water 88.00% Blue No. 1 0.20% ───────── ────────── 100.00%

[0017]

[Table 1]

[0018]

[Effect of device]

 With the structure consisting of 5 layers as described above, the absorbent layer is divided into two and the absorbent particles are changed in particle size and type, respectively. I was able to. Further, by providing a liquid diffusion layer which is an intermediate sheet made of rayon nonwoven fabric or the like between the first absorbent layer and the second absorbent layer, a separating layer is formed so that the characteristics of each water-absorbent resin can be fully exhibited. I was able to concurrently serve as a role. Then, suitable products can be provided as sanitary napkins and incontinence pads.

Furthermore, in the present invention, the second absorbent layer prevents gel blocking of the powdery water-absorbent resin by impregnating the polyhydric alcohol with the powdery water-absorbent resin, and when the second absorbent layer is used in a laminated body, it is applied to another sheet. It helps to improve the adhesiveness of and prevent the water absorbent resin from falling off the cut surface. Further, it is suitable for dispersing the powdery water-absorbent resin by impregnating the inorganic powder, and can improve the liquid permeability between the inorganic powders and improve the absorption rate. And a suitable product can be provided as a sanitary napkin or an incontinence pad.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a laminated body having a five-layer structure according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a liquid transfer process in the use example of FIG.

FIG. 3 is a schematic enlarged cross-sectional view of a second absorber layer.

[Explanation of symbols]

 1 Surface Sheet 2 1st Absorber Layer 3 Intermediate Sheet 4 2nd Absorber Layer 5 Back Sheet 10 Powdery Water-Absorbent Resin 20 Polyhydric Alcohol 30 Inorganic Powder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 7603-4C A61F 13/18 307F

Claims (2)

[Scope of utility model registration request] 1. A five-layer structure having a liquid-permeable top sheet, an intermediate sheet and a back sheet, as well as a first absorber layer between the top sheet and the intermediate sheet and a second absorber layer between the back sheet and the intermediate sheet. The first absorber layer has a low absorption rate and is formed of a powdery water-absorbent resin having a particle size of 150 to 1000 μm, and the second absorber layer has a high absorption rate and a particle size of 30 to 15 μm.
A laminated body, which is formed of a powdery water-absorbent resin having a thickness of 0 μm, and the powdery water-absorbent resin constituting the second absorber layer is formed by adhering a polyhydric alcohol and an inorganic powder. 2. The laminate according to claim 1, wherein the polyhydric alcohol is 0.5 to 7% by weight and the inorganic powder is 0.1 to 3% by weight with respect to the powdered water-absorbent resin.