Method and apparatus for controlling injection compression moldi

Details Method and apparatus for controlling injection compression moldi Method and apparatus for controlling injection compression moldi

1989-04-18

1991-04-30

Smith, Jerry

Boots, shoes, and leggings

364473, 425149, G06F 1500, B29C 4792

Patent

active

050124269

ABSTRACT:
In a method of controlling an injection compression molding of the type wherein resin is injected into a mold cavity while the metal molds are separated away a little, and thereafter the metal molds are clamped together, a pulsating mold clamping pressure is applied to the metal molds during compression. The apparatus for controlling injection compression molding comprises a mold clamping pressure setter for outputting a mold clamping signal, a pulse waveform setter for generating a pulse signal, a signal calculating unit connected to receive the mold clamping signal and the pulse signal for outputting a mold clamping control signal, a mold clamping device, and a valve responsive to the mold clamping control signal for controlling a pressurized operating fluid supplied to the mold clamping device.

REFERENCES:
patent: 4473215 (1984-09-01), Rathfon, II et al.
patent: 4674053 (1987-06-01), Bannai et al.
patent: 4881186 (1989-11-01), Tsuboi et al.
patent: 4889667 (1989-12-01), Kojima et al.

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