Injection molding machine

Details Injection molding machine Injection molding machine

1980-07-11

1982-09-14

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

B29F 106

Patent

active

043493246

ABSTRACT:
An injection molding machine, comprises, an injection piston which is hydraulically actuated during programmed injection and dwell pressure phases. During a speed-controlled injection phase I, the pressure in a tool or mold cavity is measured and monitored. As soon as the pressure reaches an initial desired value, a pressure surge-free switching to the dwell pressure phase II is effected. During the dwell pressure phase, the pressure in the tool cavity is controlled and a pressure in a hydraulic cylinder for moving the injection piston is measured and monitored. A switch signal is produced from the tool pressure and the hydraulic pressure, by means of which a switching to a solidification phase III is effected without causing pressure surges. The actual pressure value at the instant of switching serves as the initial desired value for the solidification phase III. The hydraulic pressure is controlled during this phase.

REFERENCES:
patent: 3767339 (1973-10-01), Hunkar
patent: 3840312 (1974-10-01), Paulson
patent: 3932083 (1976-01-01), Boettner
patent: 4120631 (1978-10-01), Leutner
patent: 4208176 (1980-06-01), Solerno

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