Machine for press-molding thermoplastic resin

Details Machine for press-molding thermoplastic resin Machine for press-molding thermoplastic resin

1988-05-10

1990-05-15

Thurlow, Jeffery

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

264 407, 425150, 425166, 425375, 425412, 425449, 4254519, 425557, 425DIG1, B29C 4792, B29C 4502, B28B 1302

Patent

active

049253816

ABSTRACT:
A plasticized resin is extruded from an extruding machine into an accumulator into which the resin is stored by an amount exceeding the amount required for one resin molding operation. The stored resin, in operation, is fed through a flexible hose towards a gear pump under controlled pressure conditions. The resin is measured by the gear pump and the displacement and the rotational speed of the gear pump are controlled by a suitable controller such as microcomputer to exactly measure the plasticized resin to be charged into the mold cavity in a predetermined distributing mode. The clamping of the mold can be effected by a clamping force less than that required by a conventional press-molding machine.

REFERENCES:
patent: 3148231 (1964-09-01), Spencer
patent: 3191233 (1965-06-01), Linderoth, Jr.
patent: 3412431 (1968-11-01), Lemelson
patent: 3706827 (1972-12-01), Nott et al.
patent: 4057607 (1977-11-01), Soehngen et al.
patent: 4402901 (1983-09-01), Emura et al.
patent: 4478775 (1984-10-01), Endo et al.
patent: 4600124 (1986-07-01), Price

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