JPH08207192A - Hygroscopic skin material - Google Patents

Abstract

PURPOSE: To uniformly add a binder to uniformize various capacities, in a hygroscopic skin material, by enhancing hygroscopic capacity through a binder and preventing a surface from becoming uneven in a moisture absorbing state. CONSTITUTION: A hygroscopic skin material 1 consists of a hygroscopic intermediate layer 30, a skin layer 10 and a base layer material 20 and the hygroscopic intermediate layer 30 constitutes a three-dimensional reticulated structure wherein a plurality of hygroscopic fiber layers are bonded by a binder and the binder is entangled with hydroscopic fibers in a fibrous form and cooperated to provide a large number of moisture absorbing voids and, since hygroscopic capacity is enhanced by the absorption of moisture to a large number of moisture absorbing voids and the hygroscopic fibers are restricted three-dimensionally by the three-dimensional reticulated structure, the surface of the hygroscopic skin material is not made uneven in a moisture absorbing state to become smooth.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a hygroscopic skin material,
Particularly, the present invention relates to a hygroscopic skin material suitable as a skin material for automobile seats and interiors.

[0002]

2. Description of the Related Art Conventionally, artificial skin materials made of synthetic resin materials have been widely used as skin materials for automobile seats and interior materials, but this type of skin material has poor hygroscopicity and a hard and cold feeling. Therefore, natural leather is said to be the most suitable as the above-mentioned skin material, but natural leather is disadvantageous because it is expensive and there are restrictions on the availability of materials. Therefore,
It is known to add a hygroscopic agent (eg, chitosan, collagen, carboxymethylcellulose, highly crosslinked acrylic hygroscopic fiber, etc.) to the artificial skin material in order to impart a hygroscopic function. On the other hand, Japanese Unexamined Patent Publication (Kokai) No. 3-97910 describes a natural gelatin fiber obtained by kneading a fine powder of natural gelatin into a polymer for a chemical fiber such as a synthetic resin polymer and spinning the mixture.

[0003]

In order to form a sheet-shaped hygroscopic skin material by adding hygroscopic fibers to the above-mentioned skin material, a binder is added to the hygroscopic fibers to form the hygroscopic fibers and the hygroscopic fibers. Although it is necessary to bond the fiber and the skin material, the amount of the binder added, the addition method, the material of the binder, if the form of the binder material is not properly set, the flexibility of the hygroscopic skin material is reduced, There are problems that the hygroscopicity decreases, the surface of the skin material becomes uneven in the hygroscopic state, and the like.

Further, at the stage of manufacturing the hygroscopic skin material,
When adding the binder to the hygroscopic fibers arranged in a layer of a predetermined width, it is difficult to add the binder uniformly to the hygroscopic fibers, and if the binder is added non-uniformly, the hygroscopic skin material is hygroscopic There is also a problem that it is impossible to make uniform performances such as flexibility and flexibility. An object of the present invention is to increase the hygroscopic performance of a hygroscopic skin material through a binder, to prevent the surface from becoming uneven in a hygroscopic state, and to uniformly add various properties by adding a binder. , Etc.

[0005]

The hygroscopic skin material according to claim 1 comprises a hygroscopic fiber layered between a moisture permeable skin layer and a flexible base layer material, and these three materials are bound by a binder. In the hygroscopic skin material adhered by, the binder forms a three-dimensional network structure having hygroscopic voids in association with the hygroscopic fibers in a fibrous entanglement with the hygroscopic fibers. A hygroscopic skin material according to a second aspect is the same as the first aspect, wherein the binder is made of a polyamide-based synthetic resin. In the hygroscopic skin material of claim 3, in the invention of claim 2, the binder material is made of fine powder of polyamide synthetic resin.

According to a fourth aspect of the present invention, there is provided a hygroscopic skin material according to the third aspect, wherein a plurality of layers of the hygroscopic fibers are provided. According to a fifth aspect of the present invention, in the hygroscopic skin material according to the fourth aspect, the hygroscopic fiber is a highly crosslinked acrylic hygroscopic fiber. The hygroscopic skin material according to claim 6 is
In the invention of claim 4, the blending weight ratio of the hygroscopic fiber and the binder is about 3: 1. According to a seventh aspect of the present invention, in the hygroscopic skin material according to the fourth aspect of the invention, the skin layer is formed of a moisture permeable urethane resin layer. In the hygroscopic skin material of claim 8, in the invention of claim 4, the base layer material is made of a woven fabric or a non-woven fabric.

[0007]

In the hygroscopic skin material of claim 1, hygroscopic fibers are attached in layers between the moisture permeable skin layer and the flexible base layer material, and these three are used as binders. In a hygroscopic skin material formed by adhering together, the binder is
The three-dimensional mesh structure having a hygroscopic gap is formed in cooperation with the hygroscopic fiber which is entangled in the hygroscopic fiber in a fibrous manner. The hygroscopic fiber secures hygroscopicity, but the binder cooperates with the hygroscopic fiber to form a three-dimensional network structure having a moisture absorbing void, so that the moisture absorbing action of the capillarity-like moisture absorption into the moisture absorbing void. Is also obtained, and the moisture absorption performance is excellent. Moreover, since the hygroscopic fibers are three-dimensionally constrained by the three-dimensional network structure, free random expansion of the hygroscopic fibers at the time of moisture absorption is suppressed. Therefore, the surface of the hygroscopic skin material in the hygroscopic state is made uneven. Can be suppressed to obtain a smooth surface.

In the hygroscopic skin material of claim 2, the same action and effect as in claim 1 are exhibited, but the binder is made of polyamide synthetic resin. Although this polyamide-based synthetic resin is a hydrophilic material, its hygroscopic property is improved by about 20% or more through the three-dimensional network structure (however, this has been experimentally verified).

In the hygroscopic skin material of claim 3, the same action and effect as in claim 2 can be obtained, but since the binder material is made of fine polyamide synthetic resin powder, the binder is uniformly dispersed in the hygroscopic fiber. Can be mixed into the three-dimensional mesh structure to improve the moisture absorption performance,
The various properties of the hygroscopic skin material can be made uniform throughout.

In the hygroscopic skin material of claim 4, the same action and effect as in claim 3 are exhibited, but since a plurality of layers of the hygroscopic fiber are provided, a binder is mixed with the hygroscopic fiber in the manufacturing stage. In doing so, by blending each layer, it is possible to blend uniformly throughout the layer, so that the various properties of the hygroscopic skin material can be made uniform throughout.

In the hygroscopic skin material of claim 5, the same action and effect as in claim 4 are achieved, but the hygroscopic fiber is a highly crosslinked acrylic hygroscopic fiber (moisture absorption rate about 400 times).
Therefore, it is possible to secure a moisture absorption performance that is far superior to that of natural leather. In the hygroscopic skin material of claim 6, the same action and effect as in claim 4 are achieved, but the compounding weight ratio of the hygroscopic fiber to the binder is about 3: 1.
When the amount of the binder is larger than this mixing ratio, it is disadvantageous in terms of hygroscopicity and flexibility, and when the amount of the binder is smaller than the above mixing ratio, it is disadvantageous in forming the three-dimensional network structure.

In the hygroscopic skin material of claim 7, the same action and effect as in claim 4 are obtained, but since the skin layer is made of a moisture permeable urethane resin layer, the surface feel of the hygroscopic skin material is touched. It is soft, has good texture, and is advantageous in cost. In the hygroscopic skin material according to claim 8,
Although the same action and effect as in claim 4 are exhibited, since the base layer material is made of woven or non-woven fabric, it is advantageous in terms of cost,
The work load for sewing is also low, which is advantageous in terms of handling.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example of the case where the present invention is applied to a hygroscopic skin material suitable for being applied as a skin material for automobile seats and interiors. First, the hygroscopic skin material 1
The structure will be described with reference to the drawings together with the description of the manufacturing method thereof.

As shown in FIG. 1, in the first step, highly crosslinked acrylic hygroscopic fiber (for example, fiber length 57 mm,
A raw material intermediate layer 30M having a predetermined width and a thickness of about several mm to several tens of mm is manufactured by using a hygroscopic fiber 31 having a thickness of 3 denier) and a binder 32 made of fine powder of a polyamide-based synthetic resin. At this time, the mixing ratio of the hygroscopic fiber 31 and the binder 32 is about 3: 1.

The raw material intermediate layer 30M comprises a first layer hygroscopic fiber 31a, a first layer binder 32a evenly distributed on the surface thereof, and a second layer hygroscopic fiber 31b formed on the surface thereof. And a third layer hygroscopic fiber 31c formed on the surface of the second layer binder 32b uniformly dispersed on the surface of the second layer binder 32b.
In this way, the distribution of the hygroscopic fiber 31 and the binder 32 can be made uniform over the entire surface direction and thickness direction.

Next, in the second step, as shown in FIG. 2, the raw material intermediate layer 30M is provided with a pair of upper and lower heat rollers 41, 42.
The binder 32 is formed by heating while applying pressure by
Is melted and then solidified so that the binder 32 becomes the hygroscopic fiber 31.
Then, the hygroscopic intermediate layer 30 is manufactured in a state in which a three-dimensional mesh structure is formed in which the hygroscopic fibers 31 are entangled with each other to form a hygroscopic gap. Next, in the third step, the hygroscopic intermediate layer 30
A skin layer 10 made of a moisture-permeable urethane resin layer having a thickness of several 100 μm is arranged on the upper side of the above, and a nonwoven fabric made of synthetic resin fiber having a thickness of 2 to 3 mm is formed on the lower side of the hygroscopic intermediate layer 30. The base layer material 20 is arranged, and the adhesive is sprayed onto the upper and lower surfaces of the hygroscopic intermediate layer 30 from the adhesive injection nozzles 43 and 44, and lightly pressed by the pressure rollers 45 and 46, and the skin layer 10 and the hygroscopic property are absorbed. The intermediate layer 30 and the base layer material 20 are closely adhered to each other to have a thickness of about several mm (for example, 3.0 to 8.0 m).
The sheet-like hygroscopic skin material 1 of m) is used.

As described above, the hygroscopic skin material 1 is the skin layer 1
0, a hygroscopic intermediate layer 30, and a base layer material 20, the hygroscopic intermediate layer 30 is composed of a hygroscopic fiber 31 and a binder 32 having a three-layer structure, and the binder 32 is a hygroscopic fiber 3
1 has a three-dimensional mesh structure in which a hygroscopic fiber 31 is entangled in a fibrous shape and cooperates with the hygroscopic fiber 31 to form a moisture absorption void. As shown in FIG. 4, the fine powdery binder 32 is three-dimensionally attached to the hygroscopic fibers 31 in the raw material intermediate layer 30M in the first step, and after the pressurizing and heating in the second step, as shown in FIG.
As shown in FIG. 3, the binder 32 adheres the hygroscopic fibers 31 to each other, and the binder 32 solidifies into a mesh fiber shape, and cooperates with the hygroscopic fibers 31 to provide a large number of hygroscopic voids 33.
Forming a three-dimensional mesh structure 34.

The operation of the hygroscopic skin material 1 described above will be described. In this hygroscopic skin material 1, since the hygroscopic fiber 31 adsorbs and captures water molecules by its electric force, it absorbs moisture with a hygroscopic performance of about 400 times the hygroscopic rate, and the hygroscopic fiber 31 is fibrous. Since it has a large surface area, it exhibits its original moisture absorption performance. Moreover, since the large number of moisture absorbing voids 33 are minute voids, as shown in FIG. 6, the water molecules 40 permeate and be captured by the large number of moisture absorbing voids 33 due to the capillary phenomenon. That is, the hygroscopic fiber 31 itself absorbs moisture and expands, while the large number of hygroscopic cavities 33 also exert a hygroscopic effect by a capillary phenomenon. Then, it was experimentally confirmed that the three-dimensional network structure 34 of the binder 32 and the hygroscopic fiber 31 can enhance the hygroscopic performance by about 20 to 25%.

Moreover, due to the three-dimensional mesh structure 34,
Since the hygroscopic fiber 31 is three-dimensionally restrained over the whole and free random expansion at the time of moisture absorption is suppressed, the surface of the hygroscopic skin material 1 does not become uneven in the hygroscopic state and is smooth. It becomes a smooth surface. Since the skin layer 10 is composed of a urethane resin layer having moisture permeability, the hygroscopic skin material 1
The surface feels soft, the texture is good, and it is cost effective. Further, since the base layer material 20 is made of a non-woven fabric, it is advantageous in terms of cost, the sewing load when sewing the hygroscopic skin material 1 is low, and it is advantageous in terms of handling.

In the raw material intermediate layer 30M, the powdery binder 32a of the first layer is uniformly dispersed on the hygroscopic fiber 31a of the first layer, and the binder 3 of the first layer is formed.
The second layer of hygroscopic fibers 31b is provided on the surface of 2a, and the powdery binder 32b of the second layer is evenly dispersed on the second layer of hygroscopic fibers 31b. Since the third layer of hygroscopic fiber 31c is placed on the binder 32b of No. 1 and then heat-molded under pressure, the heat-molded under pressure with the binder 32 evenly distributed over the entire hygroscopic fiber 31. Since the three-dimensional mesh structure 34 can be formed uniformly over the entire hygroscopic fiber 31, the various properties of the hygroscopic skin material 1 are made uniform over the whole.

Although the blending weight ratio of the hygroscopic fiber 31 and the binder 32 is set to about 3: 1, if the binder 32 is more than this blending ratio, it is disadvantageous in terms of hygroscopicity and flexibility. Yes, binder 32 more than the above blending ratio
If the number is small, there is a disadvantage in forming a three-dimensional network structure.

Next, a description will be given of a modification mode in which a part of the above embodiment is partially modified. 1] As the skin layer 10, a porous vinyl chloride layer and other synthetic resin porous layers can be applied in addition to the moisture-permeable urethane resin layer. The skin layer 10 is composed of a plurality of porous membrane materials. It may have a laminated structure, or may have a structure in which porous membrane materials of plural kinds of materials are laminated. 2] As the base layer material 20, in addition to synthetic resin fiber non-woven fabric, natural fiber or synthetic resin fiber woven fabric or non-woven fabric can be applied. For example, felt, flannel, thick knitted fabric, etc. can be applied. is there.

3] As the hygroscopic fiber 31, in addition to the highly cross-linked acrylic hygroscopic fiber, almost fibrous chitosan, almost fibrous collagen, carboxymethyl cellulose, and other various water-absorbing polymer fibers or almost fibrous ones Can be applied.

4] As the binder 32, in addition to the polyamide resin fine powder, short fibers and powders of polyester resin, short fibers and powders of polyethylene resin, other short fibers and powders of thermoplastic synthetic resins, and various other types. It is possible to apply a binder made of a short fiber or powder of the thermoplastic resin. 5] As shown in FIG. 7, the hygroscopic intermediate layer 30 and the skin layer 10
A cushion layer 50 made of a non-woven fabric or a woven fabric may be provided between the above and the cushion layer 50, and the cushion layer 50 may be bonded to the hygroscopic intermediate layer 30 and the skin layer 10. In this case, since the cushion layer 50 can ensure elasticity, the skin layer 10
The thickness of can be reduced.

6] The hygroscopic skin material of the above embodiment can be applied as a skin material for automobile seats and as a skin material for automobile interiors, but the use of the hygroscopic skin material is limited to these. The present invention can be applied not only to ordinary household or commercial sofas and chairs, but also to clothing such as jumpers. 6) The present invention should not be construed as being limited to the above-mentioned embodiments, but can be carried out in a mode in which various modifications are added without departing from the gist of the present invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a raw material intermediate layer of a hygroscopic skin material according to an example of the present invention.

FIG. 2 is a cross-sectional view showing a state where a hygroscopic intermediate layer is manufactured by molding the raw material intermediate layer.

FIG. 3 is a cross-sectional view showing a state where a hygroscopic skin material is manufactured by adhering the hygroscopic intermediate layer, the skin layer, and the base layer material.

FIG. 4 is a partially enlarged view of the raw material intermediate layer.

FIG. 5 is a partially enlarged view of a hygroscopic intermediate layer.

FIG. 6 is a partially enlarged view of a hygroscopic intermediate layer in a hygroscopic state.

FIG. 7 is a cross-sectional view of a hygroscopic skin material according to another example.

[Explanation of symbols]

 1 Hygroscopic Skin Material 10 Skin Layer 20 Base Layer Material 30 Hygroscopic Intermediate Layer 31 Hygroscopic Fiber 32 Binder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B32B 27/30 A 27/34 (72) Inventor Hideo Katsuta 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture No. Mazda Co., Ltd.

Claims (8)

[Claims] 1. A hygroscopic skin material comprising a hygroscopic fiber layered between a moisture-permeable skin layer and a flexible base layer material, and bonding these three members with a binder, wherein the binder However, the hygroscopic skin material is entangled in a fibrous manner with the hygroscopic fiber to cooperate with the hygroscopic fiber to form a three-dimensional mesh structure having a hygroscopic void. 2. The hygroscopic skin material according to claim 1, wherein the binder is made of a polyamide synthetic resin. 3. The hygroscopic skin material according to claim 2, wherein the binder material is a fine powder of a polyamide-based synthetic resin. 4. The hygroscopic skin material according to claim 3, wherein a plurality of layers of the hygroscopic fiber are provided. 5. The hygroscopic skin material according to claim 4, wherein the hygroscopic fiber comprises a highly crosslinked acrylic hygroscopic fiber. 6. The hygroscopic skin material according to claim 4, wherein the blending weight ratio of the hygroscopic fiber to the binder is about 3: 1. 7. The hygroscopic skin material according to claim 4, wherein the skin layer is made of a moisture permeable urethane resin layer. 8. The base layer material skin material according to claim 4, wherein the base layer material is made of a woven fabric or a non-woven fabric.