Method for press molding thermoplastic resin

Details Method for press molding thermoplastic resin Method for press molding thermoplastic resin

1991-09-25

1992-07-14

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

264 22, B29C 4556

Patent

active

051300753

ABSTRACT:
A molded article of a thermoplastic resin having good appearance is molded with a pair of molds having a conduit for supplying a resin melt in one of the molds by closing the molds till a mold cavity clearance in a closing direction reaches a specific distance, opening the molds at a specific rate while starting supply of the resin melt into the mold cavity before the clearance reaches the thickness of the finally produced article, continuing opening of the molds while supplying the resin melt till the cavity clearance becomes larger than the thickness of the finally produced article, and closing the molds at a specific rate before or when resin supply is finished to mold and cool the supplied resin melt.

REFERENCES:
patent: 4489033 (1984-12-01), Uda et al.
patent: 4707321 (1987-11-01), Segawa et al.

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