TH25213A - The injection molding process uses plastic compounds that can produce foam. - Google Patents

Abstract

The injection molding process for foamable plastic components involves injecting molten foamable plastic into a cavity with a volume smaller than the desired volume of the molded object. The component is then cooled to a container where a solidified layer, at least 0.2 mm thick, in contact with the mold surface mixes with the molten inner layer. The cavity volume is then expanded to match the desired volume of the molded object at a rate lower than the volume expansion caused by foaming of the foamable plastic. After further cooling, the molded object is removed. The resulting molded object consists of a dense, non-foaming or low-foaming layer on one surface and a high-foaming layer on the inside, and is lightweight and has good thermal insulation properties.

Claims (5)

1. Process for mold casting by injection Of plastic components Lather This consists of a process of a) injecting plastic foaming components. That melts into a cavity with a volume of 10-95% relative to the required volume of the molded item; At the state where the frozen layer With a thickness of not less than 0.00 mm in contact with the mold surface mixed with the molten inner layer; Due to the foaming of the foaming plastics; and d) after cooling, then Take out the formwork 2. The process of claim 1, where the foaming plastic component is composed of a thermoplastic. And emulsifier 3. The process according to claim 2, where the foamy plastic component is Also contains Anti-oxidizing The stabilizer is resistant to sunlight and rain. Ultraviolet absorbent Antistatic agent, paint stabilizer, olefin elastomer, inorganic container And like this 4. The 2 claim procedure in which 0.5 - 5% by weight of the foaming agent is included. Compared to the weight of thermoplastic 5.Bubble casting items Produced by the process referred to in any of the 1-4 claims