MULTILAYER INJECTION-MOULDING AND BLOW-MOULDING METHOD

摘要

The present invention relates to a molding process by superimposed injection and blowing regarding the field of mechanical engineering applied to the processing of thermoplastic polymer materials. The proposed process allows the combination of injection molding superimposed with blowing molding. The injection of superimposed material may occur before, simultaneously, or after the blowing process. Combining these two processes allows obtaining a piece consisting in one or more thermoplastic raw materials of polymer matrix, taking advantage of each process at the same time. This process can be carried out using only a mould, allowing the production of pieces with characteristics of each of the processes in a single molding cycle. It also allows obtaining plastic pieces combining the features of each process. The raw material used for the second injection may be equal to the raw material used in the first injection, but may also be different providing different color or other physical distinctive characteristics to the final product.