Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or...
Patent
1978-08-03
1980-04-08
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
264 403, 264 406, 366 79, 366142, 366145, 425143, 425161, 425162, B29F 100, B29F 308
Patent
active
041970705
ABSTRACT:
A control system for a plastic extruder which automatically controls both the melt pressure and the melt temperature of the plastic material at the outlet of the extruder barrel. The extruder barrel is divided into a plurality of heating zones and a zone temperature control means individually controls the temperature of each zone in accordance with predetermined zone temperature set points. A melt temperature control means automatically adjusts certain zone temperature set points such that the actual melt temperature is maintained at its desired value. The speed of a rotatable extruder screw is controlled by a melt pressure control means such that the actual melt pressure is maintained at its desired value. In accordance with the present invention, a separate feedforward controller and separate feedback controller are provided in the melt temperature control loop and in each zone temperature control loop such that independent specification of set point and disturbance responses can be achieved. Also, the melt temperature control means and the melt pressure control means are each provided with an interaction controller such that the interactions between melt temperature and melt pressure are minimized.
REFERENCES:
patent: 3698844 (1972-10-01), Grimm
patent: 3733059 (1973-05-01), Petit
patent: 3822867 (1974-07-01), Evans
patent: 3924840 (1975-12-01), Nelson
"Technical Data Sheet", by Harvel, Inc., TDS-247.
Heberling Richard D.
Owens--Illinois, Inc.
Woo Jay H.
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