Molding method and mold for shoe sole of foamed colored ethylene-vinyl acetate copolymer

Abstract

The present invention is molding method and mold for shoe sole of foamed colored ethylene-vinyl acetate copolymer. At least one un-cross linked and un-foamed decorating sheet is set inside one small mold in normal temperature and the small mold is set inside one large mold at reaction temperature. After the large mold is closed, sole material in the color different from that of the decorating sheet is injected, and the sole material and the decorating sheet are cross linked and foamed owing to the reaction temperature of the large mold. After demolding, the shoe sole is cooled and trimmed to produce the sole product. The present invention can produce colored foamed sole in a simple mold.

Description

【Technical field】 [0001] The invention relates to a molding method of shoe soles and applied equipment, in particular to a molding method of multicolor ethylene-vinyl acetate copolymer foamed shoe soles and a mold thereof. 【Background technique】 [0002] Such as figure 1 As shown, there is an existing multicolor ethylene-vinyl acetate copolymer foamed shoe sole molding method, which is to prepare a sheet-shaped insert 1 and a sheet-like insert 1 in advance in a molding manner, but with the same material as the insert 1 but in different colors and in the form of an insert. The plate-shaped closure 2, the insert 1 and closure 2 are molded by heating the expandable and cross-linked ethylene-vinyl acetate copolymer raw material particles to the melting point, but not heated enough to trigger the expansion filling A higher temperature for cross-linking and decomposition of the agent occurs, and a bottom surface of the cover 2 is concavely provided with a peripheral groove 201 . ...

AI Technical Summary

Problems solved by technology

[0004] 1. Because the mold 3 itself is constantly maintained at the temperature (160°C-190°C) at which the blank material, the insert 1, and the cover 2 can reach the cross-linking and foaming reactions, when the insert 1 is placed inside the cup 405 , and then affected by the temperature of the mold 3, cross-linking and foaming reactions may have begun in a local area, and even warping and deformation will occur. Although the cover 2 is used to position the insert 1 in the cup 405, but The reaction of the insert 1 may cause the cover 2 to be lifted upwards, which may easily cause the insert 1 to overflow outside the cup 405 after the reaction, resulting in defective products

[0005] 2. The peripheral groove 201 of the cover 2 must be coupled with the top edge of the annular rib 404 in order to achieve the positioning purpose, but because the temperature of the mold 3 is quite high, the peripheral groove 201 and the annular rib 404 must be connected in a short period of time. Accurate alignment within the time, it is indeed difficult to operate, and there is a danger of burns

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