Instant cold and hot forming method and forming equipment for multi-color products

Abstract

The invention provides an instant cold and hot forming method for multi-color products. The conventional forming process form is broken through, and multi-color product blanks are formed by injection molding under a cold die state; the multi-color product blanks are kept in the same die and not separated from a die cavity, so that no manmade operation errors are caused between the multi-color product blanks and the die, no gaps are formed, and no air enters; the phenomenon that formed products are low in quality such as requirement for painting and surface burning due to color crossing is avoided; furthermore, the phenomena that the vacuumizing operation is needed to be carried out before forming and the products cannot be completely vacuumized in the conventional process are avoided; moreover, the die is quickly heated to the forming temperature, to form the multi-color products; the die is opened to take out the finished multi-color products; the die is quickly cooled to the cold die state, and new multi-color product blanks are formed by injection molding under the cold die state; and therefore, instant cooling and heating are cyclically carried out, to simply, efficiently and successfully form the multi-color products with high quality. The invention further provides instant cold and hot forming equipment for the multi-color products.

Description

technical field [0001] The invention relates to the field of molding technology and equipment for multicolor materials, in particular to a method for instantaneous cold and hot molding of multicolor products and molding equipment. Background technique [0002] At present, EVA and rubber materials are widely used in various industries due to their superiority, especially in the shoemaking industry; these materials are currently using a thermal mold vulcanization molding system, so the mold temperature must be controlled at a constant temperature The condition is injected into the mold cavity for thermocompression molding or directly in the mold cavity for thermocompression molding to produce products. [0003] It is well known that EVA and rubber materials can be injected into the mold cavity after being plasticized in the screw before reaching the melting point temperature before the vulcanization temperature, and can be vulcanized in the mold cavity; but the raw material be...

AI Technical Summary

Problems solved by technology

This method uses the injection molding machine to inject molten EVA and rubber materials into the cooled mold cavity when the mold is cooled, and can directly produce multi-color blanks or make multiple single-color blanks and then combine them into multi-color blanks; After the multi-color blank is placed in the high-temperature mold cavity in the pressing machine, the vulcanization molding process is realized while the mold is closed to vacuum or the mold is opened and closed multiple times to exhaust; this method mainly has the following defects: (1) multi-color The cavity volume requirements of the cold mold and the hot mold of the mold are very precise, and the processing is extremely difficult; (2) During the process of transferring the blank from the cold mold to the hot mold, the various colors of the blank melt rapidly after encountering the high temperature mold, The situation of mutual entrainment of colors is very easy to form; (3) After the blank is placed, it is easy to squeeze the blank pigment that is in contact with the upper cavity during the process of pressing down the upper cavity of the hot mold after the blank is placed, causing the colors to cross each other. Multiple opening and closing are used It is easier to form cross-color when the mold is exhausted; (4) Air is easy to remain in the mold, and the finished product of multi-color products is easily burnt; (5) The defective products produced by the process method also need to be solved by painting or spraying Cross-color problem

[0008] To sum up: At present, there are many problems in the molding process of multi-color EVA and rubber materials, such as large equipment investment, long process flow, many staff, many defective products, poor environmental protection, low output and many other defects.

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