B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/719
B29C 47/92 (2006.01)
Patent
CA 1079466
AUTOMATIC CONTROL OF EXTRUSION Abstract of the Disclosure The actual temperature of the extrudate issuing from a long land die extruder is measured and a measurement signal representative thereof is estab- lished. The measurement signal is then compared with a setpoint signal rep- resenting the desired extrudate temperature to produce a control signal which is responsive to the difference between the measurement signal and the setpoint signal. The cooling fluid being circulated in heat exchange relationship with the extrudate in the long land die is manipulated responsive to the control signal to maintain the actual temperature of the extrudate substantially at the desired extrudate temperature. When the magnitude of the difference between the measurement signal and the setpoint signal exceeds a predetermined value. the rate of heat input to the plasticization section of the extruder and/or the rate of extrusion of the extrudate can be varied to reduce said difference to less than said predetermined value.
271826
Na
Phillips Petroleum Company
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