Process for producing a bumper for a vehicle

摘要

A process for producing a bumper for a vehicle uses a first step of injecting an outer layer forming material (M1) into a bumper forming cavity (17) through a gate (16) in a mold (13), and a second step of injecting a core forming material (M2), thereby allowing the core forming material to flow into the outer layer forming material existing in said gate and said cavity, while allowing the outer layer and core forming materials to flow within the cavity. In the mold, the volume of a mounting portion forming area (17a) of the bumper forming cavity (17) is set so that the thickness (t1) of at least a mounting portion of the bumper for mounting to a vehicle body to extend laterally from a central portion of the vehicle body can be larger than the thickness (t2) of a bumper main portion excluding the mounting portion, and the gate opens into the mounting portion forming area. Thus, the outer layer forming material can be allowed to flow substantially uniformly over the entire cavity, thereby enhancing the filling rate of the core forming material. <IMAGE>