JPS5927130Y2 - injection molded shoes - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an injection molded shoe having an insole made of synthetic fiber.

Conventionally, the insole of injection molded shoes has been made by using natural fiber cotton or artificial fiber fabric as the base fabric, and paster coated the sole side of the shoe, or by bonding the base fabric with the base fabric f-y' munori, etc. An insole was used.

After these insoles are made into shoes, when they get wet in the rain or are washed, the fiber structure loosens due to moisture, and the residual elongation strain caused during injection molding is resolved and the shrinkage stabilizes, causing the insole to shrink. It is pointed out in Japanese Utility Model Application Publication No. 5,695,003, etc. that there is a defect in which the shoes warp upward.

To solve this phenomenon, by providing a thermoplastic material layer on the inner surface of the insole (opposite the sole side) made of natural fibers or man-made fibers, the surface of the insole of the shoe becomes waterproof and the fibrous tissue becomes resistant to water. Shoes with a structure that prevents them from getting wet have been proposed.

However, since the insole surface of this shoe is made of a thermoplastic material layer, it does not have sweat absorption properties, and the feet are often stuffy, and the soles of the feet become sticky, which is not desirable in terms of hygiene management, especially in the summer.

This invention achieves the original purpose of preventing warping after washing.
To provide an injection molded shoe which also solves the problem of foot swelling.

That is, the present invention relates to an injection molded shoe in which an injection molded sole is provided on a bag-like material having a knitted inner sole made of heat-treated synthetic fibers.

A manufacturing method for injection molded shoes according to the present invention will be explained based on all the drawings. An insole knitted woven fabric 1 made of heat-treated synthetic fibers is sewn to a lace 2 to form a bag-like lace material 3. is suspended in the last 4, a sole mold 5 and a side mold 6.6 are combined on the last 4 to form a molding cavity 7, and an injection material is injected into the molding cavity to mold the sole 8. Get injection molded shoes.

Materials such as nylon, Tetron, acrylic, vinylon, etc. can be used as the synthetic fibers of the insole knitted fabric 1 made of synthetic fibers used in the present invention, and these materials can be used as the base fabric for woven or knitted fabrics. Used as an insole knitted fabric.

Here, the insole knitted woven fabric 1 of the present invention is not limited to an insole knitted woven fabric made of one base fabric of woven or knitted fabric, but also an insole knitted woven fabric made of two base fabrics bonded together with rubber glue or the like. Cloth, an insole knitted woven fabric with a synthetic resin layer laminated on the outer surface of the sole side, and an insole knitted woven fabric with a part of the base fabric, such as the periphery, reinforced with synthetic resin, etc. can also be used.

In the case of a knitted woven insole fabric in which two pieces of base fabric are bonded together using rubber glue or the like, natural fibers or artificial fibers may be used as the material for the base fabric on the sole side.

As the synthetic resin used for the insole knitted fabric with a synthetic resin layer laminated on the outer surface of the sole side, urethane resin, acrylic resin, ethylene-vinyl acetate copolymer, vinyl chloride resin, etc. can be used. Laminates layers by coating, applying, pasting, laminating, transferring, etc. on cloth using knife coating, roll coating, etc.

The synthetic resin is made into a paste-like, sheet-like, or other form as appropriate so that it can be easily laminated.

The synthetic resin layer of the obtained midsole knitted fabric is preferably thin.

This is because when the insole knitted fabric is sewn to the heel, if the synthetic resin layer is thick, it will interfere with the sewing machine feed, and the preferred thickness is 0.1 myrrJa or less.

It is preferable to heat-treat the insole knitted fabric 1 made of synthetic fiber used in the present invention before sewing it to the lace.

The conditions for the heat treatment vary depending on the material and structure of the insole knitted fabric, but it is preferably carried out at a temperature of 80° C. to 180° C. for 2 minutes to 20 minutes.

By heat-treating an insole knitted fabric made of synthetic fibers, the surface of the synthetic fibers becomes nearly melted, and the fibers bond together, albeit slightly, to improve the strength of the insole knitted fabric.

Further, if the material is heated before being sewn to the laces, the workability when sewing the laces to the laces can be improved.

The injection material used in the present invention can be urethane resin or vinyl chloride resin, which are generally used in injection molding of shoes, or foamed versions of these resins.

The injection molded shoes of the present invention use heat-treated synthetic fibers as the insole fabric, so even if the insole fabric comes into contact with water, the synthetic fiber segments will bond to each other, albeit slightly. Therefore, the twists of the threads that make up the fabric do not loosen due to moisture, and the residual strain created during injection molding is not resolved, so the insole fabric does not shrink, causing the shoe to warp upward. Never.

In addition, since the inner surface of the shoe is made of base fabric, it is breathable and sweat-absorbing, and can prevent feet from getting stuffy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating a state in which the bag-shaped sleeve material for injection-molded shoes of the present invention is mounted on an injection mold, and FIG. 2 is a cross-sectional view of the injection-molded shoe of the present invention. 1... Insole knitted woven fabric made of synthetic fibers, 2... Thick skin,
3... Bag-shaped lace material, 4... Last, 5... Sole mold, 6... Side mold, 7... Molding gap, 8...
··Shoe sole.

Claims (1)

[Scope of utility model registration request] Injection-molded shoes comprising an injection-molded sole on a bag-like material having an insole knitted fabric made of heat-treated synthetic fibers.