Process for producing bumper made of synthetic resin for automobile vehicle

摘要

An outer layer forming material (M2) is injected into a cavity (17) in a mold (13) and then a core forming material (M1) is injected, whereby the core forming material is allowed to flow into the outer layer forming material existing in the cavity, and both the materials are allowed to flow within the cavity. The cavity has a main area (171) for forming a bumper main portion (41), and side areas (172) for forming bumper sides (42). A relation, d1 > d2 is established between a distance d1 determining a bumper thickness of a first section (17a) for forming an upper portion (4a) of the bumper main portion and a distance d2 determining a bumper thickness of a second section (17b) for forming a lower portion (4b) of the bumper main portion. A relation, d3 > d1 is established between a distance d3 determining a bumper thickness of the side areas and the distance d1. A film gate (16) opens into the first section. Thus, in the main area and the side areas, the times required for the filling of the outer layer forming material to be completed are substantially equal to each other. <IMAGE>