Injection molding process using a resin reservoir containing a r

Details Injection molding process using a resin reservoir containing a r Injection molding process using a resin reservoir containing a r

1995-03-01

1996-01-16

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

2643287, 26432812, 26432818, 425425, 425542, B29C 4500, B29C 4503

Patent

active

054845637

ABSTRACT:
An injection molding process includes using a mold provided with a resin reservoir having a retractable piston and protruding from a mold cavity in at least one of divided resin passages ranging from the point where the injected molten resin is divided into two streams to a weld formed by the union of the resin streams, feeding the molten resin into the mold while the piston is in a retracted or advanced state to form the weld, and either advancing the piston toward the mold cavity side to force the resin from the resin reservoir into the cavity or retracting the piston to withdraw the resin from the cavity side into the resin reservoir so as to cause the migration of the resin in the weld to thereby force the resin on one side of the weld into the resin on the other side, thus reinforcing the weld, and which is capable of remarkably improving the strength of the weld and its periphery of a molding which otherwise forms a weld having an extremely low strength.

REFERENCES:
patent: 2191703 (1940-02-01), Anderson
patent: 4399093 (1983-08-01), Kirby et al.
patent: 4540534 (1985-09-01), Grendol
patent: 4563324 (1986-01-01), Kubat et al.
patent: 4925161 (1990-05-01), Allan et al.
patent: 4960557 (1990-10-01), Sorensen
patent: 5069840 (1991-12-01), Arnott
patent: 5090886 (1992-02-01), Jaroschek
patent: 5225136 (1993-07-01), Furugohri et al.
patent: 5260012 (1993-11-01), Arnott
JP-A 01267015 Jan. 19, 1990 Patent Abstracts of Japan vol. 14, No. 29.

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