PROCESS FOR MANUFACTURING THERMOPLASTIC RESIN MOLDINGS

摘要

A process is described for manufacturing thermoplastic resin moldings in a short molding cycle but with good appearance, nearly free from resin warp and deformation, and free from weldlines on the surface. The process uses a mold assembly comprising a pair of male and female molds, either of which has two or more freely opening and closing resin feeding gates open to the cavity surface. Also, there is a mechanism for controlling the quantity of resin to be fed from each gate and the timing of the initiation of resin feeding.