Evacuation system for injection molding machines

Details Evacuation system for injection molding machines Evacuation system for injection molding machines

1984-12-06

1986-03-04

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

With control means responsive to independently operated timer

For timing period mold is closed or period molding pressure...

425405R, 425155, 425584, 425546, 425556, 425437, B29F 100

Patent

active

045739005

ABSTRACT:
An apparatus is disclosed for controlling operating pressure within a mold cavity of an injection molding die. Finely detailed, and parts having thin walls are molded with the invention providing a process for eliminating defects. There is a pressure control apparatus which is preset to provide varying degrees of negative and positive pressure during the mold cycle, and to reset to repeat the procedure for subsequent cycles. The procedure includes a cleaning stage for preparing the mold cavity for the following mold cycle.

REFERENCES:
patent: 3452397 (1969-07-01), Newton
patent: 4019845 (1977-04-01), Birkhofer et al.
patent: 4125247 (1978-11-01), Gabrys
patent: 4185952 (1980-01-01), Hewitt
patent: 4412804 (1983-11-01), Huther

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