Method for manufacturing EVA (ethylene vinyl acetate copolymer) multi-color and multi-hardness sole

Abstract

The invention discloses a method for manufacturing an EVA (ethylene vinyl acetate copolymer) multi-color and multi-hardness sole, and the method comprises the following steps: material obtaining, injection-molding and mould cooling, first mould setting, moulding foaming, performing and second mould setting, and secondary foam forming, wherein the step of material obtaining means selecting at least two types of EVA particles which are different in color and hardness but same in foam expansion ratio; and the step of cold mould injection-molding means respectively injecting the EVA particles into different injection units, then sequentially injecting the EVA particles into different sole parts of a same sole mould and then cooling the different sole parts simultaneously. By using the method disclosed by the invention, a complete sole fork is combined with a side fork or a shoe sheet, so that the two are integrated firmly, thereby avoiding the occurrence of a situation that the complete sole wedge is separated from the side wedge after the sole is alternately contacted with sunshine, and rain for a long time; and the existing combined binding production line is saved, the production cost is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of sports shoes, in particular to a sports shoe sole and a method for making the EVA multi-color and multi-hardness sole. Background technique [0002] In order to increase the value of sports shoes, the soles are generally made into multi-color and multi-hardness shapes on the market. The main production process is to pre-dig recesses on the side or bottom of the soles, corresponding to the recesses. Side fork or shoe cover, and the hardness and color of the shoe side fork or shoe cover are different from the sole. The specific production process is as follows: separately make the EVA foaming of the shoe side fork and the EVA foaming of the whole fork of the sole, that is, select the EVA material of the shoe side fork and the full fork of the sole, respectively, injection molding cold molding treatment, and then carry out molding foaming and foaming respectively. The first mold setting step: then the EVA f...

AI Technical Summary

Problems solved by technology

[0003] However, the products obtained in this way have the most important disadvantages in production and use. The sole and the shoe side fork or the shoe cover are made of different foam materials, and then bonded. The effect of such a combination is not good. , the cost is high; due to the combination of the sole and the shoe side fork or the shoe cover, the adhesive is mainly used as the medium to make the two stick together as one; therefore, when the sole is continuously affected by sunlight, temperature and rain, The adhesive at the junction often deteriorates, causing the sole, side fork or shoe cover to separate from each other, resulting in damage to the shoe

In addition, it is necessary to increase the combined bonding production line in the production, which increases the production cost and increases the labor, glue raw materials, equipment and product workload.

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