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
1990-12-21
1992-02-11
Chiesa, Richard L.
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
425159, 425542, 425588, B29C 4580
Patent
active
050871900
ABSTRACT:
A multi-plunger molding machine having a dedicated injection circuit provided for each cavity of a plurality of cavities. Each injection circuit includes a nozzle, an injection plunger, an adjustable control cylinder dedicated to each injection plunger, a pressure control valve and a flow control valve. In this way, the quality of shot introduced into each cavity is independently controllable. A process computer and timers are used to open and close various mechanical valves in accordance with a predetermined sequence. A first timer insures that each shot undergoes a complete thermal expansion before curing begins. A second timer insures that each product is fully cured and that no product is discharged from a cavity prematurely. A flexible conduit is provided between each injection circuit and its associated nozzle so that the machine is free of runners and the concomitant waste of components is eliminated.
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Chiesa Richard L.
Mason, Jr. Joseph C.
Smith Ronald E.
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