Method and apparatus for controlling retracting speeds of inject

Details Method and apparatus for controlling retracting speeds of inject Method and apparatus for controlling retracting speeds of inject

1987-12-29

1989-02-07

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

264 401, 425145, B29C 4582

Patent

active

048022675

ABSTRACT:
In a method of controlling a charging speed of an injection molding machine, a molten resin is charged by accumulating the same in a space in a heated barrel and in front of a screw by rotating the screw, the screw is moved rearward by a back pressure produced by the accumulated resin, the screw retracting speed is detected, the detected retracting speed is compared with a reference speed, and the back pressure acting upon the screw is controlled such that the difference between the screw retracting speed and the reference speed will become zero.

REFERENCES:
patent: 3693946 (1972-09-01), Merritt
patent: 3825235 (1974-07-01), Schwertfeger et al.
patent: 3857658 (1974-12-01), Muzsnay
patent: 4511319 (1985-04-01), Takoyama
patent: 4735564 (1988-04-01), Sasaki et al.

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