Automatic control of extrusion

Details Automatic control of extrusion Automatic control of extrusion

1978-02-24

1979-09-18

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 401, 264 407, 264176R, B29F 308

Patent

active

041682904

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.

REFERENCES:
patent: 3119148 (1964-01-01), Chambers et al.
patent: 3507939 (1970-04-01), Williams et al.
patent: 3887319 (1975-06-01), Cottingham
patent: 3950118 (1976-04-01), Adair
patent: 3993421 (1976-11-01), Adair

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