Method for press-molding thermoplastic resin
AssigneeChisso Corporation
InventorsKazuo Aoki, Tsutomu Moteki, Kazuhiro Kimura
Life of this patent
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Abstract
A process is provided in which a plasticized resin is extruded from an extruding machine into an accumulator into which the resin is stored by an amount which exceeds the amount required for one resin molding operation. The stored resin, in operation, is fed through a flexible hose to a supply and measuring device, such as a gear pump, under controlled pressure conditions. The resin is measured by the supply and measuring device by regulating the flow rate of the resin and is then charged into the mold cavity in a measured amount. The clamping of the mold can be effected by a clamping force less than that required by a conventional press-molding machine.
Claims8
A method of press-molding a plasticized resin extruded from a resin extruding machine and charged into a mold cavity of a mold of a press-molding machine comprising the steps of:
- storing an amount of plasticized resin extruded from the extruding machine which exceeds that required for one molding operation;
- supplying a stored resin under a constant supply pressure;
- measuring an amount of the stored resin required for one molding operation by controlling the rotational speed of a rotary volumetric flow meter means to thereby regulate the resin flow rate;
- charging the thus measured amount of plasticized resin into the mold cavity;
- and
- clamping the mold to effect a press-molding operation.
Dependencies are inferred from the claim text.