Manufacturing method of double-layer multi-color multi-physical-property foaming product

Abstract

The invention relates to a manufacturing method of a double-layer multi-color multi-physical-property foaming product, which comprises the following steps of: manufacturing a multi-color multi-physical-property spliced non-foamed upper-layer cold blank or lower-layer cold blank by using a double-color or three-color disc machine, separating the upper-layer cold blank and the lower-layer cold blank by using a middle plate in a vacuum cover, independently heating to reach a hot pressing temperature, and carrying out hot pressing on the upper-layer cold blank and the lower-layer cold blank to obtain the double-layer multi-color multi-physical-property foaming product. After the middle plate is pulled out, the contact surfaces of the upper-layer cold blank and the lower-layer cold blank are subjected to thermal compression bonding, so that the upper-layer cold blank and the lower-layer cold blank are bonded with each other, the mold continues to be heated to enable thermal foaming to reach a preset expansion coefficient, and foaming forming is performed at the moment of mold opening; and cooling to form a double-layer multi-color multi-physical-property foaming product with multiple colors, multiple physical properties and bright color boundary. The process method has the following beneficial effects that the problem of color overflow between the upper layer and the lower layer of the shoe sole in the vulcanizing process is effectively avoided through the middle plate, and the yield of the shoe sole is increased. And air in the foaming mold is pumped out by vacuumizing the vacuum cover, so that the problems of bubbles or scorching or material shortage and the like are solved, and the yield of soles is increased.

Description

technical field [0001] The invention relates to the field of foamed products, in particular to a method for making a double-layer multicolor multiphysical foamed product. Background technique [0002] The existing technology of double-layer foamed products is to inject two or more granulated and composite materials into a cold mold through a disc machine first to obtain the designed unfoamed primary shapes (cold embryos) of different shapes, and then put them into a cold mold. Several initial shapes are spliced ​​into a foaming mold and foamed in the mold under high temperature and high pressure conditions, thereby splicing several materials with different colors and physical properties on the same product. [0003] The existing double-layer foamed sole manufacturing method is to carry out injection molding and one-shot injection molding. For example, CN105885147A A manufacturing method of a high-elasticity sole is disclosed by using a rubber mold to firstly inject the elast...

AI Technical Summary

Problems solved by technology

As the upper and lower soles are stacked together to add sulfur and heat, there are mixed and uneven spilled materials (commonly known in the industry as overflowing or color shifting) at the boundary between the upper and lower soles, which will affect the overall exquisiteness of the finished sole. Secondly, Foamed products are mainly formed by expanding the foamed material in the mold and then shaping it. However, during the expansion process, the foamed material will squeeze the space in the mold cavity, and the existing mold does not have the ability to remove air. Function, during production, the air in the existing mold tends to accumulate together and occupy the space in the mold, resulting in the formation of large-volume holes or bulges or scorching of the produced soles, resulting in insufficient hardness and low density. equal disadvantage

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