Injection molding process of foamed multicolor material

Abstract

The invention discloses an injection molding process of a foamed multicolor material, and belongs to the field of injection molding process. The injection molding process of the foaming multicolor material comprises the following steps: mixing of a polymer melt and a foaming agent: uniformly mixing the foaming agent with the polymer melt through a microcellular foaming injection molding machine, and keeping a high-pressure environment; forming of a preformed blank: injecting the mixed system of the polymer melt and the foaming agent into a special-shaped mold, and performing pressure maintaining and cooling to obtain the preformed blank; heating and foaming: starting foaming after softening the preformed blank; foaming and expanding the polymer melt; and cooling: after foaming and expansion, starting to cool the mold to room temperature, and finally, opening the mold to take a part to obtain a final finished product. According to the scheme, the original step of transferring the preformed blank is omitted, heating and foaming treatment is directly carried out after the preformed blank is formed, the preformed blank does not make contact with the outside before foaming, the influence of external uncertain factors is avoided, by deleting the working procedures, the injection molding process is accelerated, and the injection molding quality can be optimized.

Description

technical field [0001] The present invention relates to the field of injection molding technology, more specifically, relates to a kind of injection molding technology of foaming multi-color material. Background technique [0002] Microcellular foamed plastics are defined as polymer materials with a cell size of 1-10 μm, a cell density of 109-1010 cells / cm3, and a closed-cell structure. The main design idea of ​​this material is: when the size of the cell in the plastic is smaller than the crack inside the material, the existence of the cell will passivate the original crack tip of the material, which is beneficial to prevent the crack from expanding under stress, so that the material The mechanical properties are improved. Since the advent of microcellular foam injection molding technology for more than 30 years, although it has received widespread attention in the fields of automobiles, home appliances, aerospace, and biomedicine, there is still a technical problem in thi...

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Problems solved by technology

[0004] The injection molding process in the above technical solution needs to go through preform forming, preform transfer and heating and foaming. The intermediate preform transfer process is relatively cumbersome, which slows down the injection molding process. In addition, there are many external factors during the preform transfer process. Influenced by uncertain factors, it is easy to cause preform deformation

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