Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1985-05-14
1986-06-03
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
264 403, 425166, 425555, B29C 4554
Patent
active
045927120
ABSTRACT:
A plastification and injection device for an injection molding machine includes a plunger rod on the pressurized piston coupled to a spindle on which the valve body of a directional control valve is guided axially. The spindle is axially rotatable and is coupled to a stepping motor controlled in accordance with the injection pressure and/or the injection rate. The shaft of a hydromotor driving the plastification and injection screw is guided by means of another directional control valve, the valve body of which is guided so as to slide axially on the shaft. And, this shaft is further coupled to another stepping motor. This, upon completion of the plastification process, the direction of rotation of the hydromotor is reversed in order to close the backflow and, because of the interaction of the other stepping motor and the other directional control valve, the screw moves axially by a predetermined amount to close the backflow.
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Fortenberry J.
Klockner-Werke Aktiengesellschaft
Woo Jay H.
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