Process for producing bumper made of synthetic resin for automob

Details Process for producing bumper made of synthetic resin for automob Process for producing bumper made of synthetic resin for automob

1996-11-07

2000-05-09

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264255, 2643288, 425130, 293120, B29C 4516, B60R 1903

Patent

active

060600047

ABSTRACT:
An outer layer forming material is injected into a cavity in a mold and then, a core forming material 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 for forming a bumper main portion, and side areas for forming bumper sides. A relation, d.sub.1 >d.sub.2 is established between a distance d.sub.1 determining a bumper thickness of a first section for forming an upper portion of the bumper main portion and a distance d.sub.2 determining a bumper thickness of a second section for forming a lower portion of the bumper main portion. A relation, d.sub.3 >d.sub.1 is established between a distance d.sub.3 determining a bumper thickness of the side areas and the distance d.sub.1. A film gate 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.

REFERENCES:
patent: 4174413 (1979-11-01), Yasuike et al.
patent: 5059361 (1991-10-01), Da Re'264 25

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