Ethylene-vinyl acetates film for crosslink foaming , parts of shoes using the same and making method thereof

Abstract

The invention relates to an ethylene-vinyl acetates film for crosslink foaming , parts of shoes using the same and making method thereof, the EVA category film for the crosslinking foaming has a height of 0.01-2mm, preferably 0.1-1.0mm.

Description

Technical field [0001] The present invention relates to an ethylene-vinyl acetate (hereinafter referred to as EVA) film for cross-linked foaming, and insoles, midsoles, midsole / outsole integrated soles, uppers or uppers using the film Footwear parts, the cross-linked foaming EVA film is compatible with conventionally used flakes or discs with a certain thickness (usually 2.5-3.0mm) or more (usually 3.0-4.0mm in diameter and 4-5.0mm in height) ) Different, it has a thickness of 0.01-2mm, preferably 0.1-1.0mm; the shoe component obtained by using the above-mentioned film manufacturing method can diversify the color tone and appearance of each layer and / or each part of a molded body, and at the same time The hue and physical properties of different parts can be designed and manufactured hierarchically, so that many mechanical properties such as density, hardness, abrasion, elasticity, degree of recovery after compression, and degree of deflection / bending are suitable for different fu...

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Problems solved by technology

However, this will cause limitations in the scope of application of the design and the expression method of the design, and problems such as a decrease in durability and productivity, and an increase in cost.

[0047] Third, if the physical properties of each part are graded in order to improve wear resistance, cushioning absorption, stability, and comfortable foot feel, if the manufacturing process and joining process of each part are not passed , there is a problem that there are two or more color tones or physical properties on one part

[0048] The 4th, when making the cross-linked foam molded product by integrating the shoe midsole and the sole as the low window part of the EVA material of the cross-linked foam molding in the past, the selection range of the material is narrow and cannot be adjusted for each molded product. Sufficient functional differentiation of different parts

For example, it is difficult to simultaneously realize the weight reduction, wear resistance, and multiple density of different parts of the final product in a single product through the above-mentioned one-time foam molding process or two-time compression re-molding process.

[0049] Fifth, as a result, in the case of using the conventional flake-like or disc-like cross-linked foaming EVA base compound, the manufacturing unit price becomes high due to the additional manufacturing process and the increase in the number of molds, and it is difficult to realize the various molded products. The diversification of the physical properties of the parts cannot realize the diversification of the design

[0050] Sixth, especially in the case of using sheet-like materials, where the surface is uneven and its size deviation is above a certain thickness, usually where the deviation (for example, 2.5mm to 3.0mm) is large, the above-mentioned 1-time hair loss process should be carried out on the part of the shoe. In the foam molding process or the secondary compression molding process, it is difficult to prevent the mutual invasion of color tone and physical properties, and it is difficult to ensure the reproducibility and consistency of product quality for mass production

[0051] This is because from the point of view that the X-Y-Z axis shape of the above-mentioned sheet-like material must be fully controlled, the shape is precisely controlled by foaming or compression molding so as to meet the design standards of the product. The characteristics of its forming process are extremely difficult to achieve

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