JPH01145002A - Water-absorptive insole - Google Patents

Abstract

PURPOSE: To provide an insole with high water absorbency and resilience by overlaying hot-melt adhesive liquid permeable nonwoven fabric on both sides of a wetting agent containing hot-melt adhesive water absorbent nonwoven fabric via hot-melt adhesive web layers. CONSTITUTION: In a water absorbent insole for a boot, sports shoes, etc., hot- melt adhesive composite web layers 2 are provided on both sides of a hot-melt adhesive water absorbent nonwoven fabric 3, which is a middle layer, on both sides of which a wetting agent 4 has been applied. In addition, hot-melt adhesive liquid permeable nonwoven fabric 1 is overlayed on the outer sides of the web layer 2, and this multilayer body is fused by heat to integrate. As hot-melt adhesive water absorbent nonwoven fabric and hot-melt adhesive conjugate fibers are used in this way, it is possible to obtain an insole which is of extremely high water absorbency, lightweight, highly resilient, and provides a good fit to wear.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a water-absorbing insole that is used in shoes, particularly for rain boots and sports shoes. This invention relates to a water-absorbing insole that is used inside shoes in environments where water is likely to come out.

[Conventional technology]

Various shoe insoles have been proposed in the past, but their basic structure is generally made of a highly elastic sponge material such as urethane foam, and a base fabric is attached to the surface to create a moisture-absorbing insole. It also serves as a stopper.

There are also insoles that are made of sponge-based materials mixed with deodorizers and antibacterial agents to prevent bad odors from the feet and the growth of bacteria.

Furthermore, insoles with a large number of small holes are also available on the market to improve breathability.

Although these insoles serve their intended purpose when worn on a daily basis, and there are few problems, they may lack water absorption in environments where water and sweat are likely to be produced, such as when working with water, playing sports, or working at high temperatures. However, sponge insoles lack the ability to absorb sweat (about 0.5 to 4 times the water absorption capacity with pure water). However, even if sponge insoles absorb sweat and moisture, they will wick away sweat and moisture when pressure is applied. The problem is that it floats out, making your feet and socks wet and making you feel uncomfortable.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a water-absorbing insole that has high water-absorbing performance for absorbing moisture and sweat from the feet and is also highly elastic.

[Means for solving problems]

The present invention provides a water absorbent insole that can achieve the above object.

That is, the present invention comprises a heat-adhesive, liquid-permeable nonwoven fabric laminated on both sides of a heat-adhesive, water-absorbent nonwoven fabric containing a moisture absorption agent, with a heat-adhesive composite web layer interposed therebetween, and this lamination. This invention relates to an insole characterized in that its body is heat-fused and integrated.

To explain an example of the insole of the present invention with a drawing, as shown in Fig. 1, a wetting agent 4 is applied to both sides, a specific heat adhesive water absorbing nonwoven fabric 3 is used as an intermediate layer, and a thermoadhesive composite web layer is formed on both sides. 2. is located, and further the core web layer 2.2
A heat-adhesive, liquid-permeable nonwoven fabric 1 is laminated on the outside. This laminate is heat-sealed and integrated.

The above configuration will be described in detail below based on preferred embodiments.

(1) Heat-adhesive water-absorbing nonwoven fabric consisting of one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, with at least a portion of the low-melting point synthetic resin exposed on the surface, such as fibrillated yarn or composite fiber. attaching a water-soluble resin to at least the exposed surface of the body, and then cross-linking it;
The resulting highly water-absorbent defibrated yarn or composite fiber is made into short fibers, then made into a web, and then this web is bonded under heat to form a sheet.

The above-mentioned defibrated yarn is produced as follows. That is, a film laminate consisting of one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, in which at least a portion of the low-melting point synthetic resin is exposed on the surface, is stretched and then slit into narrow widths, or It is obtained by slitting the tape to a width and then stretching it to obtain a tape-like laminate, which is then split by a conventional method.

The tape-like laminate preferably has a thickness of 500 to 10,000 deniers, particularly 1,000 to 3,000 deniers. The fibrillated yarn is made by applying this tape-like laminate to a striped roll to make it into a net shape or completely into fibers, and the fibrillation width is preferably 0.03 to 0.2 mm, more preferably 0.03 to 0.0 mm. .11 cod, most preferably 0
．． 03 to 0.07 mm. (Defibrated yarn is 500 to 10
It can be used as is as a yarn bundle having a thickness of 1,000 denier, particularly 1,000 to 5,000 denier. If the splitting width of the fibrillated yarn single yarn exceeds 0.21, the amount of water-soluble resin attached will be small and the texture of the water-absorbent nonwoven fabric will be poor. It is difficult to split a material with a secondary split width of less than 0.03+m. ) Preferred examples of film laminates used for manufacturing tape-like laminates include a two-layer laminate of high melting point synthetic resin layer/low melting point synthetic resin layer (hereinafter abbreviated as high/low), low/high/low. 3-layer laminates, and 5-layer laminates of low/high/low/high/low.

Next, the composite fiber body used in the present invention is also composed of one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, and has a structure in which at least a part of the low-melting point synthetic resin is exposed. Specifically, there are drawn side-pie-side type composite fibers made of a high-melting point synthetic resin component and a low-melting point synthetic resin component, and cis-type fibers made of a low-melting point synthetic resin sheath and a high-melting point synthetic resin core. A drawn core-type composite fiber is used. The fineness of the drawn T-composite fiber is 10~
Preferably it is 60 denier.

Although the number of layers in the tape-like laminate and composite fiber body is not particularly limited, it is preferable that the high melting point synthetic resin constitutes the inner layer and the low melting point synthetic resin constitutes the outer layer. The larger the difference in melting point between the high melting point synthetic resin and the low melting point synthetic resin, the better, and generally it is preferably 10° C. or higher. However, the difference in melting point may be small for synthetic resins with a sharp melting point.Generally, high melting point synthetic resins are thermal 0T plastics such as crystalline polypropylene, high density polyethylene, polyester, nylon 6, and nylon 66. Selected from synthetic resins.

Furthermore, as the low melting point synthetic resin, one that exhibits good bonding properties with the high melting point synthetic resin is used.

Specific examples include polyolefins such as low-density polyethylene, linear low-density polyethylene, and high-density polyethylene; ethylene-vinyl acetate copolymers; maleic acid,
Graft-modified with unsaturated carmenic acids or their anhydrides such as fumaric acid, itaconic acid, maleic anhydride, and itaconic anhydride to produce polyolefins (ER11) such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and polypropylene. ethylene-maleic anhydride-methyl methacrylate ternary copolymer ethylene-acrylate or methacrylate copolymers, such as (ET resins), ethylene-acrylic acid copolymers (EAA resins), ethylene-ethyl acrylate copolymers (EEA resins); and ethylene-methacrylic acid copolymers. Examples include resins (ionomer resins) that are partially neutralized with metals such as IJ, zinc, etc., and become 9-thermoplastic.

Next, a water-soluble resin in powder form is uniformly adhered to the outer surface of the low melting point synthetic resin layer exposed on the surface of the composite fiber body. Preferably, a charged coating machine is used for this purpose.

The above-mentioned water-soluble resin refers to a water-soluble polymer having a carboxyl group, a sulfonic acid group, or a salt thereof, and specific examples include polyacrylic acid and its copolymer, I-lyacrylate, and polyacrylamide moiety. Examples include hydrolysates, polystyrene sulfonic acid, polyacrylamide propane sulfonic acid, and sulfuric copolymers.

The average particle diameter of the water-soluble resin is preferably as small as possible so that it can cover as densely as possible the low melting point synthetic resin layer exposed on a part of the surface of the tape-like laminate, its defibrated yarn or composite fiber body, which will be described later. . Generally, the average particle size is 10-500
μ, preferably 10-300 μ, more preferably 10-300 μ
It is 50μ.

If the average particle size exceeds 500 μm, the water-soluble resin will not form a dense coating, and the surface of the resulting composite will become rough.

Water-soluble resins with an average particle size of less than 10 microns are difficult to manufacture and handle, and are also expensive.

The amount of water-soluble resin attached is generally 5 to 6 to
0% by weight, preferably 10-60% by weight.

It is preferable to use a charged coating method for attaching the powdered water-soluble resin to the fibrillated yarn or the composite fiber body. The reason is that the adhesion work can be performed automatically, very uniform adhesion is possible, and the amount of adhesion can be controlled.

In addition, in implementing this, the low melting point synthetic resin layer may be heated to near its melting point, and then the water-soluble resin may be applied with a charged coating, or the low melting point synthetic resin layer may be first electrically coated with a water-soluble resin, and then the low melting point The synthetic resin layer may be heated to near its melting point.

In any case, the low-melting point synthetic resin layer is heated to near its melting point, but the high-melting point synthetic resin layer does not undergo any major changes due to heating, so the fibrillated yarn and composite fibers lose their orientation. It maintains good tensile strength without any stiffness.

The adhered powdery water-soluble resin is then crosslinked.

The following crosslinking agents are used for this purpose.

The crosslinking agent used in the present invention is one that has two or more functional groups capable of reacting with the carboxyl group, sulfonic acid group, or a salt thereof in the water-bathable resin and exhibits water-bathability. You can use anything. Typical examples include polyfunctional epoxies such as sorbitol polyglycidyl ether, 1,° liglycerol polyglycidyl ether, dicrycerol I liglycidyl ether, glycerol pholycidyl ether, ethylene glycol diglycidyl ether, and polyethylene glycol diglycidyl ether. Examples include compounds.

These crosslinking agents may be used as they are in contact with the water-soluble resin, but the carboxyl groups and sulfonic acid groups in the water-soluble resin facilitate the reaction with the solera salt and facilitate the crosslinking. In order to make the density uniform, it is preferable to use the crosslinking agent in the form of an aqueous solution.

The amount of crosslinking agent used is 0 based on the weight of the water-soluble resin after adhesion.
．． It is desirable that the amount is 0.01 to 2% by weight.

The reason for this is that if the amount of crosslinking agent used is less than 0.01% by weight, the degree of crosslinking will be low, and it will dissolve without obtaining sufficient water absorption performance. This is because the degree of crosslinking is too high, resulting in insufficient water absorption ability.

The defibrated yarn or composite fiber to which the water-soluble resin has been crosslinked in this way is shortened into short fibers and made into a quepe in the next step.

In other words, if you use a combing roll such as a garnet roll with a large number of needles on its surface, it will cost 3,000 to 5,000 yen.
While rotating at high speed with rprn, the treated defibrated yarn is brought into contact with a bundle of composite fibers, and these treated defibrated yarns are used to scrape the composite fibers with a needle. By cutting and depositing the obtained fine hairs (short fibers) on a screen net using a vacuum, a water-absorbing web can be formed on the screen net. Note that a cutter may be used instead of a combing roll to shorten the fibers.

The water absorbent web is then transferred to a nonwoven fabric manufacturing process. That is, this web is placed on a belt conveyor,
By press-bonding with a hot plate or hot roll, the desired sheet-like heat-adhesive water-absorbing nonwoven fabric can be obtained.

Although the above describes the process of producing a heat-adhesive water-absorbing nonwoven fabric from a fibrillated yarn or a composite fiber body, the invention need not be limited thereto.

1. For example, in the above explanation, the water-soluble resin was attached to the fibrillated yarn or composite fiber body and crosslinked, but it is also possible to use a chive-like laminate instead of the fibrillated yarn or composite fiber body. .

In this case, it is necessary to split the chive-like laminate after crosslinking to create a fibrillated yarn, and the resulting fibrillated yarn is shortened into fibers and webd in the same manner as described above, and then A sheet-like heat-adhesive water-absorbing nonwoven fabric is produced by thermocompression bonding.

Furthermore, in the present invention, it is also possible to produce a heat-adhesive water-absorbing nonwoven fabric using a polymeric water-absorbing agent.

That is, the powdered polymeric water absorbing agent is completely added and fused to the exposed surface of the low melting point synthetic resin of the defibrated yarn, composite fiber body or tape-like laminate, and then in the case of the former two, the same procedure as described above is applied. In the latter case, in the case of a tape-like laminate, fibrillated yarns are created by splitting, and then short fibers are formed into webs using the same method. It is sufficient to go through the processes of oxidation and thermocompression bonding.

As a powdered polymer water absorbing agent, the water absorption capacity is 500 to 1000.
Preferred examples include sodium polyacrylate crosslinked product, potassium polyacrylate crosslinked product, saponified product of acrylic acid-vinyl acetate copolymer, dengue-acrylic acid graft copolymer, and imbutylene-maleic anhydride. Examples include acid copolymers.

When adding and fusing the powdered polymeric water absorbing agent, the tape-shaped laminate, the defibrated yarn, and the composite fiber are heated to approximately the melting point of the low-melting point synthetic resin by circulating heated air and passing through a heating device. When the surface is almost molten, it is sent into a tank containing a powdered polymeric water absorbing agent. During this passage, the polymeric water-absorbing agent is fused to the composite fibers of the tape-like laminate and the defibrated yarn under an appropriate pressing force. It is desirable to heat the polymeric water-absorbing agent in advance to a range that does not impair its waterproofing effect (for example, 60 to 100°C).

After fusion, the tape-like laminate, defibrated yarn, or composite fiber body comes out of the polymer water-absorbing agent tank and is wound around a male pin or the like. In addition, when applying a polymeric water-absorbing agent to the defibrated yarn, in order to achieve uniform fusion of a large amount of the polymeric water-absorbing agent and to further improve the fusion effect, the expanded yarn is widened and high-polymerized. It is preferable to pass it through a tank containing a molecular water-absorbing agent.

(2) Regarding the heat-adhesive composite web The defibrated yarn machine in the previous item (1) is made by shortening the composite fiber body into short fibers in the same manner as described above, and then forming it into a web. It was stopped at a stage. It is also possible to use cards and random Unipers for web production. In addition, in this process, 5 to 20 layers of rayon thread, etc.
It may be mixed into the web in a range of .

(3) Regarding heat-adhesive liquid-permeable nonwoven fabric, see the previous section (1)
The detangled yarn or composite fibrous body is made into short fibers in the same manner as described above, further made into a web, and finally, the web is fully heat-pressed to form a sheet. Of course, the liquid permeable nonwoven fabric obtained here has a basis weight (Fi/m2)
can also be changed freely.

(4) Lamination means After preparing the thermoadhesive water-absorbing nonwoven fabric of item (1), the thermoadhesive composite web of item (2), and the thermally adhesive liquid-permeable nonwoven fabric of item (3), the following steps are performed. It is preferable to laminate the layers in a specific manner.

First, in order to impart complete hygroscopicity, a wetting agent is coated and impregnated on one or both sides of a heat-adhesive water-absorbing nonwoven fabric. The wetting agent may be present near the surface of the heat-adhesive water-absorbing nonwoven fabric, or the wetting agent may penetrate into the interior of the heat-adhesive water-absorbing nonwoven fabric. Wetting agents include glycerin, ethylene glycol, propylene glycol, polyethylene glycol, polyethylene glycol, diethylene glycol monoethyl ether, 1,3-butylene glycol, /I
Polyhydric alcohols such as J-glycerin, and hygroscopic polymer substances such as methylcellulose, sodium carboxymethylcellulose, xylitol, sorbitol, and maltitol can be used, and two or more of these can also be used in combination. In addition, when using a hygroscopic polymer substance, it is applied and impregnated in the form of an aqueous solution. At this time, it is preferable to remove excess water if necessary. The amount of the wetting agent applied and impregnated is preferably in the range of 1:1 to 1:1.5 in weight ratio to the amount of water-absorbing polymer deposited in the heat-adhesive water-absorbing nonwoven fabric.

Next, a heat-adhesive composite web is placed on both sides of the heat-adhesive water-absorbing nonwoven fabric by applying and impregnating it with a wetting agent, and a heat-adhesive liquid-permeable nonwoven fabric is further placed on both sides of this web. After that, the whole is placed in a mold and heat-sealed to a thickness of, for example, 3 mm. A hot air circulation oven is suitable as the heat fusion machine, and the fusion temperature cannot be determined unconditionally since it varies depending on the resin used, but it is generally 135 to 155°C, preferably f';i: 140 to 15.
0°C, and the fusion time is 3 to 20 minutes, preferably 10
~15 minutes. In order to improve the thermal melting of N, pressure may be applied to the laminate from both sides.

When thermal fusion is performed in this manner, each layer of the laminate is uniformly bonded, thereby obtaining the desired water-absorbing insole. be able to. Although there is no particular limitation on the basis weight of each layer, generally the heat-adhesive water-absorbing nonwoven fabric has a weight of 50 to 300.
1/m2, thermal adhesive composite web 100-30 respectively
09/m, thermal adhesive liquid permeable nonwoven fabric 20-6 respectively
It is preferable to set it to 0g/I@2. Further, although the above method is preferable as the order of the lamination process of each layer, it is not necessary to limit it to the above method as long as the structure of the insole satisfies FIG. 1.

Furthermore, an antibacterial agent or a deodorizing agent may be added to the water-absorbing insole of the present invention. For example, it suppresses the growth of bacteria.
For this purpose, N-(fluorodichloromethylthio)-phthalimide is added as an antibacterial agent to the low-melting point or high-melting point synthetic resin constituting the water-absorbing insole in advance in an amount of 0.5 to 1% of the resin amount.
．． 5! If you add % mashed and knead it, its effect will be fully exhibited.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

In addition, the measurement of the water absorption capacity of the obtained water-absorbent insole is as follows:
111 insole t Soaked in 150mJ of distilled water for 5 minutes, then 2nd wire mesh and JK Kwai 4'-150-8
Pour it on top of (Terash), drain for 10 minutes, find the amount of water that flows out, and calculate it using the formula below.

Example 1 After forming a three-layer blown film with the following composition and treatment, this film was slit as shown below, stretched with a hot roll, and then split with a sugerite roll to obtain a fibrillated yarn.

Outermost screw diameter: 40 strokes Cylinder temperature: C1: 170°C C2: 1
90℃ C3: 200℃ L-LDPE (Linear low density polyethylene, density 0
．． 92011/cm5, MFR 3.0 g/l 0 min, melting point 120°C) Pace ER resin (maleic anhydride graft ratio 0.35%, melting point 122°C) was melt extruded.

Intermediate layer screw diameter 65■φ Cylinder temperature C: 180℃C2:
200℃ C3: 210℃ pp (crystalline polyethylene, density 0.901/cm',
MFR3, O# / 10 minutes, melting point 160°C) was melt extruded.

innermost layer Screw diameter: 40 φ Other conditions are the same as for the outermost layer.

Die 9-, 7' 1kl, 2m, take-up speed 31.5m/min, thickness ER resin layer (20μ)/PP layer (10μ)/E
After taking off the three-layer blown film of the R resin layer (20μ), the film was slit into a width of 40m, stretched in the longitudinal direction at a stretching roll temperature of 103°C and a stretching ratio of 5 times, and split with a splitting width of 0. It was defibrated on 07-. The resulting yarn is 3012 denier.

Next, a large number of these defibrated threads are bundled and a large number of needles are erected on the surface.
A 7'h combing roll is rotated at a high speed of 4000 rpm, and the above bundled tM yarn is white-bladed on it, and the defibrated yarn is made into short fibers using a needle. A thermally adhesive composite web is obtained by suction depositing on top.

Next, the heat-adhesive composite web obtained in the same manner as above was placed on a belt conveyor, and three heat rolls (125°C)
A sheet-like heat-adhesive, liquid-permeable nonwoven fabric was obtained by heat-compression bonding through the wafer, and its basis weight was 209/ln2.

Next, the average particle size of the fibers was 50.
Powder of sodium polyacrylate of about μ size is applied using a charged coating device, and heated to around 130°C to make it adhere more firmly. The amount of sodium polyacrylate attached is approximately 40 times the weight of the fibrillated yarn. Afterwards, it was cross-linked with an aqueous solution of sorbitol polyglycidyl ether. The amount of polyglycidyl ether used was 0.01 kg by weight based on the weight of sodium polyacrylate. A large number of the obtained sub-water-absorbent defibrated yarns are bundled, a combing roll with a large number of needles is rotated at a high speed of 4000 rpm, and the water-absorbent defibrated yarn is brought into contact with the combing roll,
The fibers were made into short fibers, and the resulting short fibers were deposited on a screen net using a vacuum to obtain a water absorbent web.

By placing this water-absorbing web on a belt conveyor and passing it through three heat rolls (125°C) for thermocompression bonding,
Obtained heat-adhesive water-absorbent nonwoven fabric. Its basis weight is z 10 y
It is yJ.

Subsequently, glycerin is applied to both sides of this heat-adhesive water-absorbent nonwoven fabric so that the weight ratio of the water-absorbing polymer attached to the heat-adhesive water-absorbent nonwoven fabric is 1=1, and the heat-adhesive The composite webs were stacked so that the fabric weight was 1501/m2 (one side), and the heat-adhesive liquid-permeable nonwoven fabric was layered on both sides of the web so that the fabric weight was 20117m2/m2 (one side), resulting in a nine-layer structure. Body thickness 2.5 m
The insole was placed in a mt mold, the front and back sides of the mold were held down with wire mesh, and then heat fused using a heat fusion machine at a temperature of 145°C for 15 minutes to obtain an elastic water absorbent insole. The thickness of the obtained insole was 3 mm.

We measured the water absorption capacity of this water-absorbent insole using pure water and found that the water absorption capacity of pure water was 18 times. te, use this water-absorbing insole as an insole inside your rain boots when the outside temperature is 33℃.
The water absorption amount was measured after 8 hours of use at ℃ and found that each leg absorbed 5 g.

Note that this water-absorbing insole had a good feel when worn and did not slip, and the surface did not tear at t7.

Example 2 As a heat-adhesive composite Kuep, rayon yarn was added to M fiber yarn.
A water-absorbing insole was produced in the same manner as in Example 1, except that a thermoadhesive composite web mixed with 3 Nffc% cotton was used.

The water absorption rate of this water-absorbent insole is 25 times that of pure water, and when used inside a pair of rain boots, the water absorption rate of one foot was 6.
The water absorption capacity was 0 g/8hr, which was good.

The covering felt good, and there was no tearing of the surface.

Comparative Example 1 The water absorption capacity of a commercially available insole made of urethane foam with a base fabric attached was measured using pure water and found to be 3.2 times. In addition, when we actually measured the amount of water absorbed by placing it inside boots, it was as low as 0.6 g/8hr for one foot. In addition, the covering feels slimy and bends, making it uncomfortable.

The performances of the insoles of Examples 1 and 2 and Comparative Example 1 are shown in Table 1.

〔Effect of the invention〕

As mentioned above, unlike conventional insoles, the water-absorbing insole of the present invention uses a heat-adhesive water-absorbing nonwoven fabric and a heat-adhesive composite fiber, so it has extremely high water absorption performance, is lightweight, and has excellent elasticity. It's rich and has a very good feel after covering. Moreover, it has the advantage that it can be bonded by applying heat, and the process is simple and mass production is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the water absorbent insole of the present invention. DESCRIPTION OF SYMBOLS 1...Liquid permeable nonwoven fabric, 2...Thermoadhesive composite web layer, 3...Thermoadhesive water absorbent nonwoven fabric, 4...Wetting agent.

Claims (7)

[Claims] (1) A thermoadhesive liquid-permeable nonwoven fabric is laminated on both sides of a thermoadhesive water-absorbent nonwoven fabric containing a wetting agent via a thermoadhesive composite web layer, and this laminate is heat-sealed. A water-absorbing insole characterized by being integrated with (2) The heat-adhesive composite web is a fibrillated yarn or composite comprising one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, and at least a part of the low-melting point synthetic resin layer is exposed on the surface. The water-absorbing insole according to claim (1), which is obtained by shortening the fiber body and further forming it into a web. (3) The heat-adhesive water-absorbing nonwoven fabric is a fibrillated yarn or Attaching a water-soluble resin to at least the exposed surface of the low-melting point synthetic resin layer of the composite fiber body and cross-linking it, and converting the obtained water-absorbent defibrated yarn or composite fiber body into short fibers,
The water-absorbing insole according to claim 1, wherein the web is then formed into a web, and this web is further heat-pressed to form a sheet. (4) A tape-shaped laminate in which the heat-adhesive water-absorbing nonwoven fabric is composed of one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, and at least a part of the low-melting point synthetic resin layer is exposed on the surface. A water-soluble resin is attached to the above-mentioned exposed surface, which is then cross-linked, and then this tape-like laminate is split to create a fibrillated yarn, which is made into short fibers, and then made into a web. The water-absorbing insole according to claim 1, wherein the web is further thermocompressed to form a sheet. (5) The thermoadhesive water-absorbent nonwoven fabric is a fibrillated yarn or A polymeric water-absorbing agent is added and fused to at least the exposed surface of the low-melting point synthetic resin layer of the composite fiber body, then this defibrated yarn or composite fiber body is made into short fibers, then it is formed into a web, and this web is further thermocompressed. A water-absorbing insole according to claim (1), which is made into a sheet. (6) A tape-shaped laminate in which the heat-adhesive water-absorbing nonwoven fabric is composed of one or more layers of high-melting point synthetic resin and one or more layers of low-melting point synthetic resin, and at least a part of the low-melting point synthetic resin layer is exposed on the surface. Adding and fusing a polymeric water absorbing agent to the exposed surface of the tape, then splitting this tape-like laminate to create a fibrillated yarn, making the fibrillated yarn into short fibers, and then forming it into a web.
The water-absorbing insole according to claim 1, wherein the web is further thermocompressed to form a sheet. (7) The thermoadhesive liquid-permeable nonwoven fabric is a fibrillated yarn comprising at least one layer of high-melting point synthetic resin and at least one layer of low-melting point synthetic resin, and at least a portion of the low-melting point synthetic resin layer is exposed on the surface. Alternatively, the water-absorbing insole according to claim (1), which is obtained by shortening the composite fiber body, then forming it into a web, and then heat-pressing the web to form a sheet.