JPH0693841B2 - Injection molding shoe manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an injection-molded shoe.

(Prior art) Conventionally, according to Japanese Patent Publication No. 50-8375, a sock-like stretchable backing fabric with a heel reinforcement piece laminated with a woven fabric and a synthetic resin film on the heel portion is hung on the last. After that, a method for manufacturing an injection-molded shoe has been proposed in which the shoe-based molding material is set in a mold and the shoe-based molding material is injected into the mold cavity to mold the shoe-based material on the surface of the back cloth. However, since there is a large difference in expansion and contraction between the elastic backing cloth and the heel reinforcing piece, the hanging work when hanging the backing cloth while stretching it is hindered, or the heel reinforcing piece is peeled from the backing cloth, Wrinkles on the heel reinforcement pieces expose the heel reinforcement pieces to the surface of the shoe main body during shoe main molding, resulting in defective products.Wrinkles on the reinforcement pieces are fixed by the shoe main molding, and the foot contact is reduced. There was a drawback that the feeling of wearing was significantly impaired.

(Problems to be Solved by the Invention) The present invention eliminates these drawbacks and makes it easy to suspend the back cloth against the last of the back cloth. It is intended to provide a high-quality injection-molded shoe that does not cause wrinkles.

(Means for Solving Problems) Hereinafter, the present invention will be described with reference to the drawings showing an embodiment. According to the present invention, the heel portion 11 is provided with a stretchable heel reinforcing cloth 2 made of a stretchable yarn. The back cloth 1 made of a sock-like stretchable knitted cloth adhered by the adhesive layer is hung on the last 4 and then set in the mold 5, and the shoe-based molding material is injected into the mold cavity 6. , Mainly shoe 3 on the surface of lining 1
The gist of the invention is a method for manufacturing an injection-molded shoe, which is characterized in that

In the present invention, the back cloth 1 is formed by cutting an ordinary sock-shaped knitted fabric or a tricot knitted fabric and sewing it into a sock shape. And elastic heel reinforcement fabric 2
Is formed by expanding and cutting a cloth woven of elastic fiber threads such as rubber thread and spanidex, or a cloth knitted with these elastic threads along the shape of the heel portion. The elastic heel reinforcement cloth 2 is adhered to the heel portion 11 of the back cloth by the elastic adhesive layer, and the adhesive is made of natural rubber, synthetic rubber or urethane adhesive. An adhesive whose elastic layer itself is stretchable is used.

If a heat-sensitive adhesive such as a thermoplastic polyurethane or chloroprene rubber adhesive is used as the adhesive, the adhesive is applied to the heel-reinforcing cloth forming cloth before the elastic heel-reinforcing cloth 2 is expanded and cut. When the elastic heel reinforcement cloth 2 is formed and dried and then the elastic heel reinforcement cloth 2 is spread and cut, the adhesive can be efficiently applied, and the adhesive layer is formed when the elastic heel reinforcement cloth 2 is bonded. The adhesion work is simple because it is only activated by heating and pressed against the heel of the back cloth 1.

In this way, if the back cloth 1 in which the elastic heel reinforcement cloth 2 is attached to the heel portion 11 with the elastic adhesive layer is stretched and hung on the last 4, the elastic heel reinforcement cloth 2 can be stretched at the time of suspension. In addition, the elastic adhesive layer is expanded and contracted according to the expansion and contraction of the back cloth 1, and is brought into close contact with the heel portion of the last 4. After the last 4 with the back cloth 1 suspended in this way is set in the mold 5 by a conventional method, a shoe-main molding material is injected into the mold cavity 6 to mold the shoe main body 3 on the surface of the back cloth 1. It is a thing. As the shoe-based molding material, vinyl chloride resin, liquid polyurethane, thermoplastic rubber and the like which are commonly used in the production of injection-molded shoes are appropriately selected and used according to the application of the shoe.

(Effects of the Invention) Since the present invention is configured as described above, when the back cloth 1 is hung on the last 4 while being stretched, it is attached to the heel portion 11 of the back cloth by the elastic adhesive layer. The elastic heel reinforcement fabric 2 expands and contracts in accordance with the expansion and contraction of the heel portion 11 of the back cloth, which makes it convenient to hang it. Moreover, the heel portion 11 and the heel reinforcement cloth of the lining cloth at the time of hanging as in the conventional case. The heel reinforcement cloth 2 will not be peeled off due to the difference in expansion and contraction of 2, and the elastic heel reinforcement cloth 2 will not be wrinkled.

Therefore, when the shoe body is molded, the elastic heel reinforcement fabric 2 is mainly used as the shoe body 3.
Exposed on the surface of the heel, or elastic heel reinforcement fabric when hanging 2
The wrinkles formed on the upper part are not fixed by the shoe main body 3, and a high-quality injection-molded shoe can be obtained.

[Brief description of drawings]

FIG. 1 is a sketch of a backing cloth used in the present invention, and FIG. 2 is a cross-sectional view of essential parts showing a molding state of an injection-molded shoe according to the present invention. Explanation of the reference 1. Back fabric, 11. Heel part 2. Elastic heel reinforcement fabric, 3. Shoe mainly 4. Last, 5. Mold 6. Mold cavity

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29C 45/14 8823-4F // B29L 31:50 4F

Claims (1)

[Claims] 1. A back cloth 1 made of a sock-like stretchable knitted fabric in which a stretchable heel reinforcement cloth 2 made of stretchable yarn is attached to a heel portion 11 with a stretchable adhesive layer. 4 and then set this in the mold 5 and inject the shoe-main molding material into the mold cavity 6 so that the shoe main body 3 is applied to the surface of the back cloth 1.
A method for manufacturing an injection-molded shoe, which comprises molding