Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – Molding of thermosetting or cross-linking stock
Patent
1988-06-29
1989-11-21
Hart, Charles
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
Molding of thermosetting or cross-linking stock
2643286, 425546, B29F 100
Patent
active
048818909
ABSTRACT:
A moulding apparatus for moulding a reaction composition including a metering cylinder having an open head-end, a piston in said cylinder, screw operable for advancement towards and retraction from said head-end, a cylinder head on said head-end, an intake port and a discharge port both opening to said head-end and both extending through said head, a circularly sectioned valve chamber extending through said head and intersecting both said ports, a plug valve rotatably housed in said chamber and having two angularly phased-apart passages through it respectively able to register with said ports, and means for actuation of said piston and rotation of said plug-valve under such co-ordinated or independent control that when said piston is retracting from said head-end the intake port is open and the discharge port is closed, and when said piston is advancing towards said head-end the intake port is closed and the discharge port is open.
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"New RIM Metering System", Process Engineering, p. 15, Pub. Date Unknown.
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