JP2000210104A - Shoe fitted with one-piece waterproof interior material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoe fitted with a waterproof interior trim material of one-piece structure wherein flat sheet material is not formed by sewing, joining, etc. SOLUTION: The present invention uses a one-piece waterproof interior material capable of expanding and contracting previously shaped three- dimensionally so as to fit the foot shape. The waterproof interior material is manufactured by putting on a high-contractive meshing base cloth in a sack (sock) form or cylindrical form on a last, dipping it in a liquid-state elastomer (rubber latex), and subjecting to drying and hardening (vulcanization).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to shoes provided with a waterproof interior material.

[0002] A general shoe-making process is to form a joint between an upper member and a sole member. For the upper member, the material of the shell and various interior materials provided in the form of a flat sheet is divided into pieces of appropriate shape and size, and these are cut and sewn, joined, etc. to fit the footprint again. It is made by uniting with the shape.

[0003] The upper member made in this manner is firmly integrated with the insole in a process called hanging, and is joined or formed by sewing or bonding with a sole formed from leather or a rubber material, and integrated. Is done.

Since various performances such as comfort, durability, waterproofness, and moisture permeability are required for shoes, uppers include, for example, a skin, various backing materials, various core materials for a toe portion and a heel portion, Many members, such as various interior materials, which serve as cushioning materials for improving comfort, are used.

[0005] In particular, in the step of forming the shell and various interior materials three-dimensionally from the upper part to the sole part by sewing or pressure bonding, since the material is a flat sheet, it is divided and cut into appropriate pieces as described above. Again, these pieces need to be sutured or joined. This operation itself is a time-consuming process, but it is necessary to reinforce a portion that is easily bent, for example, a tapered portion, because a joint at a toe portion is likely to be frayed or broken. Also, since the joint of the waterproof interior material, especially the sewn joint, does not have waterproofness, it is necessary to attach a waterproof tape to the joint.

The materials of the waterproof interior materials proposed so far are a polytetrafluoroethylene (PTFE) film, a non-hydrophilic porous coating fabric, a laminated fabric of a water vapor permeable non-porous film, a water vapor permeable non-porous material. Includes coated fabrics and the like. There have been proposals to reduce the number of pieces to be joined by using a waterproof, moisture-permeable polyurethane film having elasticity as the material itself. (Japanese Unexamined Patent Publication No. 6-7080
4). However, there is no known one-piece waterproof seamless interior material. This is because it is impossible to make a one-piece interior material having a three-dimensional shape that fits a footprint as long as a flat sheet-shaped material is used.

[0007]

DISCLOSURE OF THE INVENTION The present invention uses a one-piece waterproof interior material that is three-dimensionally formed in advance to fit the shape of the foot. This waterproof interior material is manufactured using a last made of a suitable material such as metal, glass or ceramic. A sack-shaped knit base fabric with high elasticity is put on the last. Next, the shoe last covered with the base cloth is immersed in the liquid elastomer, pulled up, and the elastomer is cured (vulcanized).
Then, the mesh of the base fabric is continuously closed by the web of the elastomer.

[0008] The three-dimensionally molded one-piece waterproof interior material obtained by removing the mold is then formed into an upper, an insole and a sole formed of a shell, a backing material, a core material of a toe and a heel, a cushioning material and the like. And finished into finished shoes.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 9 show a specific example of a process for producing the preventive interior material of the present invention and a process for attaching the same to shoes.

First, as shown in FIG. 1, a last (dip type) 1 and a base cloth 2 are prepared. The shoe last (immersion mold) 1 can be made of a latex molding immersion mold material such as metal, glass, and ceramic. The base fabric 2 of this specific example is a commercially available knitted nylon sock with high elasticity. Similarly, a knitted knit sleeve with a suitable diameter, which is also highly elastic, may be cut to a suitable length, one end thereof may be sewn closed and used as a bag, or a waterproof interior material is not required for a portion corresponding to the sole. In such a case, it can be used in the form of a tubular base cloth having frays stopped at both ends.

FIG. 2 shows a state in which the last 1 on which the socks 2 are put is going to be immersed in the liquid elastomer tank 3. Typical examples of liquid elastomers that can be used for this purpose are natural or synthetic rubber latex. Other liquid elastomers such as a polyurethane elastomer emulsion or solution can be used as long as they do not substantially impair the elasticity of the base fabric when it is applied to the base fabric, dried and then cured.

In this example, a compounded latex having the following composition was used.

Component No. 1 No. 2 SBR latex 50 {natural rubber latex 50 100 potassium oleate 12 antioxidant SP 11 vulcanization accelerator ZnEDC 0.5 0.5} ZnMBT 11 sulfur 22 zinc oxide 33 (numerical values are dry weight Part)

The sock 2 put on the last 1 was immersed in the above compounded latex, taken out, air-dried for 3 hours, put in a heating oven, and vulcanized at 70 to 80 ° C. for 10 minutes.
The mold was demolded and deburred to obtain a waterproof interior material 4 shown in FIG. 3 and three-dimensionally formed in advance so as to fit the foot. At this time, the weight (one foot) of the socks 2 is about 2.
5 g, but the amount of fixed latex (dry weight)
Was about 10 g.

The shoe-making process using the stretchable waterproof socks 4 thus obtained is shown in FIGS. The shoemaking last 6 is inserted into the upper 5 prepared in advance by molding the shell, the backing material, the core material of the toe and the heel, the cushioning material, etc. (FIG. 4), and the waterproof sock 4 is inserted between the shell and other members. And put on the last 6 (FIGS. 5 and 6). Next, as shown in FIG. 7, the midsole 7 is hung on the lower surface of the waterproof sock 4 and integrated. Finally, the sole 8 is compression molded to complete the shoe 10 (FIGS. 8 and 9), and the last 6 is taken out.

As described above, according to the present invention, since the waterproof interior material has no seams or joints and can be manufactured into a three-dimensional one-piece by immersion molding, the shoe has excellent waterproof performance and durability. Provide the advantage that it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a drawing illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 2 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 3 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 4 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 5 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 6 is a view illustrating a manufacturing process and a shoe manufacturing process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 7 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 8 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

FIG. 9 is a diagram illustrating a manufacturing process and a shoe-making process of a waterproof interior material (waterproof socks) according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Immersion molding last 2 Nylon socks 3 Compounded latex tank 4 Finished waterproof socks 5 Upper assembly 6 Last 7 Middle sole 8 Sole

Claims (3)

[Claims] 1. A shoe having at least a one-piece stretchable waterproof interior material formed three-dimensionally in advance so as to fit the shape of a foot, at least at a shell. 2. The shoe according to claim 1, wherein the waterproof interior material is a one-piece member having a seamless structure in which a mesh of a highly elastic knitted base fabric is continuously closed by a highly elastic elastomer web. 3. The waterproof interior material is made by covering a bag (sock) or tubular highly elastic knitted fabric with a shoe-type immersion mold, immersing in rubber latex, drying and vulcanizing, and then removing the mold. The shoe of claim 1.