Process for producing automobile bumper made of synthetic resin

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

1998-05-11

2000-10-24

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

2643288, 26432812, 26433113, 264921, B28B 722

Patent

active

061362492

ABSTRACT:
A process for producing a bumper of synthetic resin for use in an automobile, the bumper including a core and an outer layer covering the core. The process includes the steps of preparing a core forming material that includes a main component and a polyethylene added to the main component, the main component being produced by pulverizing a recovered bumper which has been formed using a polyolefin-based resin composition modified by an olefinic elastomer and which has a thermosetting synthetic resin coating film on its surface, and an outer layer forming material that includes the polyolefin-based resin composition modified by the olefinic elastomer and the polyethylene in a content A.sub.2 which is smaller than a content A.sub.1 of the polyethylene included in the core forming material (A.sub.2 <A.sub.1); injecting the outer layer forming material through a feed channel into a bumper molding cavity in a mold; injecting the core forming material to flow into the outer layer forming material located in the feed channel and the cavity, and allowing the outer layer forming material and the core forming material to flow into the cavity; and pushing the outer layer forming material and the core forming material which are located in the feed channel into the cavity by the outer layer forming material thereby to form the core and the outer layer.

REFERENCES:
patent: 3878282 (1975-04-01), Bonis et al.
patent: 5064724 (1991-11-01), Ofstein
patent: 5094905 (1992-03-01), Murray
patent: 5122398 (1992-06-01), Seiler et al.
patent: 5125817 (1992-06-01), Yamachika
patent: 5180629 (1993-01-01), Terada et al.
patent: 5276093 (1994-01-01), Kitagawa et al.

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