Injection molding method

Details Injection molding method Injection molding method

1994-08-18

1996-02-20

Heitbrink, Jill J.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425587, B29C 4550

Patent

active

054926700

ABSTRACT:
An injection molding method characterized in that after resin charging is completed, with the screw allowed to rotate, process is shifted to the metering process, and using the back pressure in the metering process as a dwelling pressure, dwelling is performed simultaneously with the resin metering. In addition, with the back pressure required for metering set to a higher value as a primary back pressure, and using the back pressure as a dwelling pressure, dwelling is performed simultaneously with the resin metering, and after the dwelling time has elapsed, with the pressure allowed to lower so as to use as a secondary back pressure, the metering is continued to a set time. According to the above-mentioned method, as a whole, the required cycle time becomes shorter than in a conventional case where metering is started after dwelling.

REFERENCES:
patent: 4208176 (1980-06-01), Salerno
patent: 5219512 (1993-06-01), Tsitsumi

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