Injection molding method forming strengthened weld by using well

Details Injection molding method forming strengthened weld by using well Injection molding method forming strengthened weld by using well

1992-04-09

1993-07-06

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432812, B29C 4518

Patent

active

052251365

ABSTRACT:
In a method of injection-molding a thermoplastic resin wherein a weld is formed in the mold cavity by the fusion of separate resin streams, use is made of a mold provided with a resin well protruding from the molded cavity or a runner on at least one of the separate resin streams at a point between where the injected molten resin is separated into streams and the weld. The resin is poured into the resin well after the formation of the weld from the feed of the molten resin into the mold cavity to cause migration of the resin at the weld, thus forcing the resin on one side of the weld into the resin of the other side of the weld to thereby strengthen the weld.

REFERENCES:
patent: 3880978 (1975-04-01), Apostoleris et al.
patent: 4399093 (1983-08-01), Kirby et al.
patent: 4420452 (1983-12-01), van Dalen et al.
patent: 4925161 (1990-05-01), Allan et al.
patent: 4994220 (1991-02-01), Gutjahr et al.
patent: 5069840 (1991-12-01), Arnott

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