Hydraulically controlled extruder injection molding units for the processing of rubber
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United States of America Patent
Stats
-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Jun 4, 1984
filing date -
Jun 7, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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