CN1074352C - Ethylene-vinyl acetate copolymer two-color double-hardness combined shoe sole injection foaming manufacturing method - Google Patents

Abstract

A method for manufacturing double-color and double-hardness combined sole of ethylene-vinyl acetate copolymer by injection molding and foaming comprises the steps of manufacturing the appearance of a shoe edge block by using harder EVA plastic, wherein the end face of the shoe edge block in the direction opposite to a shoe is provided with more than two embedding holes; placing the shoe edge block into a preset position of a shoe-shaped mold cavity in a foaming mold; the soft material EVA is used as sole plastic; injecting sole plastic into the foaming mold, and allowing the sole plastic to flow into the mold cavity to coat the shoe edge block; opening the mold and taking out the finished product; and (5) placing the finished product into a tunnel oven for shaping. The shoe edge block is made of harder EVA and is injected with softer EVA sole plastic to coat the shoe edge block, so that the shoe edge block is integrally combined with the sole, and the shoe edge block has the effects of double colors, double hardness, stable combination, quickness and attractiveness.

Description

Ethylene-vinyl acetate copolymer two-color double-hardness combined shoe sole injection foaming manufacturing method

The invention relates to a shoe manufacturing technology in shoes in the field of personal articles, in particular to a shoe sole injection foaming manufacturing method in which EVA (ethylene vinyl acetate copolymer) in the shoe sole is combined with two colors and two hardnesses.

In order to meet the needs of ergonomics more in the manufacturing design of the sole of sports shoes, a shoe edge block 30 is installed on the side of the sole 40 as shown in Figure 5 at present, and the effect of the shoe edge block 30 is to adopt a relatively The material is harder than the sole 40, which can maintain the shape of the shoe and make walking more comfortable, while reducing the possibility of injury, but the manufacturing method of the shoe edge block 30 combined with the sole 40 is: first make the sole 40 → on the side of the sole 40 Excavate the edge relative to the preset position of the shoe edge block 30 to form an interface 41, → make a shoe edge block 30 made of a harder material, and the shoe edge block 30 can be of different colors → at the position of the interface 41 of the sole 40 and Coat the opposite surface of the shoe edge block 30 with adhesive such as resin, → glue the shoe edge block 30 to the sole 40 to fill the position of the interface 41 to form a complete shoe sole 40, and can have two colors and different hardness. The shoe edge block 30 is Exposed on the sole 40. However, this manufacturing method has the following disadvantages in manufacturing:

1. The manufacturing process is troublesome and cumbersome:

It is necessary to manufacture the sole 40 first, and then dig out the interface 41 to fill and glue the finished shoe edge block 30. The manufacturing process is complicated, and it needs to wait for drying time after bonding, and it needs to be carefully positioned during the waiting period. In order to prevent sticking and displacement, the mass production efficiency is poor.

2. Increased cost:

In addition to the cumbersome manufacturing process and increased costs, the extensive use of adhesives also increases costs, and adhesives with better properties are naturally selected for retention. It is conceivable that increased costs are an inevitable result.

3. The combination effect is not durable:

If the resin bonding method is not good during the bonding process, it is easy to cause a poor adhesion between the shoe edge block 30 and the sole 40, and it must be painstakingly bonded strongly. At the same time, the shoes are more likely to be exposed to sunlight due to years of walking and wearing. And rainwater so that the material is aging, resulting in the disadvantages of poor gluing, and the instability problem that is easier to fall off.

4. There will be seams between the shoe edge block and the sole:

The shoe edge block 30 and the sole 40 are sometimes designed to be double-colored depending on the needs of the market, but the shoe edge block 30 and the sole 40 will be prone to seams, and the beauty of the two-color design will be lost in vain. If paint spraying is carried out directly on shoe side piece 30, then easily fade and reveal background color, very not attractive in appearance.

This shows that above-mentioned existing sole manufacturing method still has many defectives, and Cheng waits to be further improved.

In view of the defects in the above-mentioned existing shoe sole manufacturing method, the inventor actively researches and innovates based on rich practical experience and professional knowledge, through continuous research, design, and after repeated trial samples and improvements, finally creates a this invention.

The main purpose of the present invention is to overcome the defects in the existing shoe sole manufacturing method, and provide a shoe sole injection foaming manufacturing method combining two colors and two hardnesses of ethylene vinyl acetate copolymer, so that it mainly uses the shoe edge block as the shoe sole The plastic is integrally covered and formed. The edge block is made of harder material, while the sole is made of softer material. When the edge block is made first, it is combined with the sole plastic injection molding, so that the edge block that is different from the color and hardness of the sole is integrated. It is firmly combined with the sole of the shoe, and has the effects of durable wear, no falling off, beautiful effect and low cost.

The purpose of the present invention is achieved by the following technical solutions. A kind of ethylene-vinyl acetate copolymer two-color dual-hardness combined shoe sole injection foaming manufacturing method proposed according to the present invention, its manufacturing process is: a: make shoe edge block: make shoe edge block with harder EVA plastics The outline of the shoe edge block is also formed with more than two embedded holes on the end face facing the shoe direction; b: Insert the mold: put the shoe edge block into the preset position of the shoe-shaped mold cavity in the foaming mold ; c: Preparation of sole plastic: Prepare softer EVA as the sole plastic; d: Injection coating: inject the above sole plastic into the foaming mold, control the temperature at 160-180°C, and control the time at 5-10 minutes Inside, the plastic of the sole flows into the mold cavity to cover the edge of the shoe; e: mold opening: open the mold to take out the finished product; f: finished product: put the finished product into the tunnel oven to shape it.

The purpose of the present invention can also be further achieved through the following technical measures. In the aforementioned ethylene vinyl acetate copolymer dual-color dual-hardness combination shoe sole injection foaming manufacturing method, wherein the shoe edge block and sole plastic can be of different colors.

Compared with the prior art, the present invention has obvious advantages and positive effects. As can be seen from the above technical solutions, the features of the present invention are as follows:

1. Fast manufacturing, effectively improving batch production efficiency:

As long as the relatively hard shoe edge is made first, and the sole plastic is integrally injection-molded, a two-color, two-hardness sole is completed. Compared with the existing cumbersome manufacturing method of digging and bonding, the operation process can be greatly shortened. Manufacturing Faster and more stable, improve production efficiency.

2. The bonding effect is solid, reliable and durable:

Since the shoe edge block is combined with the plastic on the sole in a semi-fluid state, the plastic flows over the embedding hole in a flowing state and closely contacts the peripheral surface of the shoe edge block, so the bonding is quite reliable and durable, ensuring long-term use .

3. The combination of two-color and double-hardness is quite natural and not easy to fade:

Because the shoe side block is pre-formed, it can be independently made of colored plastic, and it does not need to be covered with spray paint, it is extremely difficult to fade, and it is easy to maintain the beautiful effect of two colors.

4. Cost reduction:

The invention avoids the manufacturing method of using a large amount of adhesive, saves the time cost of the bonding process and the expense of the adhesive, can reduce the cost and increase the profit.

In summary, the present invention is mainly to make the shoe edge block with harder EVA, put the harder shoe edge block in the mold, inject and coat the shoe edge block with the softer EVA sole plastic, and make the shoe The edge block is integrated with the sole, which can achieve the effect of two-color and double-hardness combination, which is stable, fast and beautiful. No matter in the manufacturing method, structure or function, it has been greatly improved, and has produced useful and practical effects, and indeed has enhanced efficacy, so it is more suitable for practical use. It is a novel, progressive and practical product. new design.

The specific structure of the present invention is given in detail by the following examples and accompanying drawings.

Figure 1 is a flow diagram of the elements of the present invention.

Fig. 2 is a perspective view of the appearance of the edge block of the present invention.

Fig. 3 is a perspective view of the sole-covered edge block of the present invention.

Fig. 4 is a cross-sectional view of the sole-covered edge block of the present invention.

Fig. 5 is an exploded perspective view of a conventional shoe edge block and shoe sole combination structure.

Below in conjunction with accompanying drawing and preferred embodiment, its specific manufacturing method, structure, characteristic and effect thereof of the sole injection foaming manufacturing method that proposes according to the ethylene vinyl acetate copolymer two-color dual-hardness combination of the present invention are described in detail as follows.

Please refer to Fig. 1, Fig. 2, shown in Fig. 3, the sole injection foaming manufacturing method that ethylene vinyl acetate copolymer two-color double hardness of the present invention combines, its manufacturing process is as follows:

a: Manufacture shoe side blocks:

The outline of the shoe edge block 10 is made of hard EVA (ethylene vinyl acetate copolymer) plastic, and the end face of the shoe edge block 10 is also formed with more than two embedded holes 11 at the same time. The shape of the embedding hole 11 is not limited.

b: Put into the mold:

Put the shoe edge block 10 into the preset position of the shoe-shaped mold cavity in the foaming mold;

c: Prepare sole plastic:

Prepare the EVA of softer material as sole plastic 20;

d: injection molding coating:

Please refer to Figure 4, inject the above-mentioned sole plastic 20 into the foaming mold, control the temperature at 160-180°C, and control the time within 5-10 minutes, so that the sole plastic 20 flows into the mold cavity and covers the edge of the shoe Block 10, because the shoe edge block 10 is formed with an embedding hole 11, so the fluid of the sole plastic 20 forms a structure and function of grasping and embedding, and the shoe edge block 10 is firmly embedded;

e: mold opening:

Open the mold to take out the finished product;

f: finished product:

Put the finished product into the tunnel oven to shape, forming the appearance structure as shown in Figure 3.

The following features of the present invention are described as follows: the present invention only needs to make the hard shoe edge block 10 first, and let the sole plastic 20 be integrally injection-molded to coat, and then complete the sole of the two-color, double-hardness, which is more complex than the existing cumbersome digging. The manufacturing method of gluing has greatly overcome its disadvantages, shortened the operation process, naturally made its manufacturing more rapid and stable, and effectively improved the efficiency of batch production; because the shoe edge block 10 is combined with the sole plastic 20 in a semi-fluid state , the flowing state of the plastic covers the embedding hole 11 and closely contacts the peripheral surface of the shoe edge block 10, so its bonding firmness is quite reliable and durable, and the problem of joint falling off will not be caused by wind and rain, and the use can be ensured. Durability; because the shoe edge block 10 is pre-formed, it can be independently made of colored plastic, so it does not need to be covered by spray painting, and it is extremely difficult to fade. Even if there is a slight flaw, it only needs to be repainted a little, and it is easy to maintain the two-color appearance. Effect, so that the two-color and double-hardness combination is quite natural and not easy to fade; it can avoid the manufacturing method of using a large amount of adhesive, save the time cost of the bonding process and the cost of adhesive, and can reduce the production cost.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

Claims (2)

1, a kind of ethylene-vinyl acetate copolymer two-color dual-hardness combination shoe sole injection foaming manufacturing method is characterized in that its manufacturing process is: a: Manufacture shoe side blocks: The outline of the shoe edge block is made of harder EVA plastic, and the end face of the shoe edge block facing the direction of the shoe is also formed with more than two embedded holes; b: Put into the mold: Put the shoe edge block into the preset position of the shoe-shaped mold cavity in the foaming mold; c: Prepare sole plastic: Prepare soft EVA as sole plastic; d: injection molding coating: Inject the above-mentioned sole plastic into the foaming mold, control the temperature at 160-180°C, and control the time within 5-10 minutes, so that the sole plastic flows into the mold cavity and covers the edge of the shoe; e: mold opening: Open the mold to take out the finished product; f: finished product: Put the finished product into the tunnel oven to shape. 2. The method for manufacturing shoe soles by injection molding and foaming based on the combination of two colors and two hardnesses of ethylene vinyl acetate copolymer according to claim 1, characterized in that the shoe edge blocks and the sole plastics can be of different colors.

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