Automatic control of extrusion

Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control

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Details

264 407, 425145, 425379R, B29F 308

Patent

active

040884309

ABSTRACT:
The actual temperature of the extrudate issuing from a long land die extruder is measured and a measurement signal representative thereof is established. The measurement signal is then compared with a setpoint signal representing 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.

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patent: 3887319 (1975-06-01), Cottingham
patent: 3907961 (1975-09-01), Carrow
patent: 3993421 (1976-11-01), Adair

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