Hydraulically controlled extruder injection molding units for th

Details Hydraulically controlled extruder injection molding units for th Hydraulically controlled extruder injection molding units for th

1984-06-04

1986-12-30

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

264403, 264405, 425145, 425149, 425542, B29C 4577

Patent

active

046326510

ABSTRACT:
Disclosed is a hydraulically controlled extruder injection molding unit which includes a measured value pick-up for the position of the piston rod of the working cylinder and/or of the injection piston. A pressure control valve which can be switched on is provided in the line leading to the surge chamber of the working cylinder for the piston. A proportionally controlled pressure valve is provided in the line to the other surge chamber, the value being controlled as a function of dropping control values when switching from subsequent pressure to dynamic pressure until the measured value pick-up emits an output signal. The then existing instantaneous value of the dynamic pressure is then added to the preselected dynamic pressure. Consequently, the dynamic pressure phase takes place under a corrected dynamic pressure.

REFERENCES:
patent: 3148231 (1964-09-01), Spencer
patent: 3932083 (1976-01-01), Boettner
patent: 4135870 (1979-01-01), Wallace
patent: 4207047 (1980-06-01), Kolb et al.
patent: 4208176 (1980-06-01), Salerno
patent: 4256678 (1981-03-01), Fujita et al.
patent: 4325896 (1982-04-01), Rodgers, Jr.
patent: 4426341 (1984-01-01), Tsuzuku et al.

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