Machine for press-molding thermoplastic resin
AssigneeChisso Corporation
InventorsKazuo Aoki, Tsutomu Moteki, Kazuhiro Kimura
Life of this patent
Estimating the term…
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.
Claims13
A machine for press-molding a plasticized resin extruded from a resin extruding machine and charged into a mold cavity of a mold comprising:
- an accumulating means operatively connected to an outlet port of the extruding machine for accumulating the plasticized resin in an amount exceeding that required for one resin charging shot into a mold cavity;
- means for supplying the accumulated resin from said accumulating means under a constant pressure;
- means for measuring an amount of the supplied resin required for one molding operation under a regulated resin flow rate condition said measuring means comprising a rotary type volumetric meter for measuring the plasticized resin in accordance with the revolution number thereof;
- means for charging the thus measured resin into a lower member of a mold cavity of a press-molding machine in an open state;
- means for controlling operation of said measuring means;
- means for controlling movement and operation of said measuring and charging means for charging the measured resin in predetermined portions into the mold cavity;
- and
- means for clamping the mold halves after charging of the resin into the mold cavity.
A machine for 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:
- an accumulating means comprising a piston-cylinder assembly operatively connected to an outlet port of the extruding machine for accumulating the plasticized resin in an amount exceeding that required for one resin charging shot into a mold cavity;
- means for supplying the accumulated resin from said piston-cylinder assembly at a constant pressure;
- means for measuring an amount of the supplied resin required for one molding operation at a regulated resin flow rate condition operatively connected to said accumulating means, said measuring means comprising an intermittently operating gear pump means;
- means for charging the thus measured resin into a lower member of the mold cavity in an open state;
- means for providing heated fluid flow of resin between said accumulating means and said charging means;
- means for controlling operation of said measuring means;
- means for controlling operation of said charging means for charging the measured resin in a predetermined portion into the mold cavity;
- and
- means for clamping the mold halves after charging the resin into the mold cavity.
Dependencies are inferred from the claim text.