Extruder viscosity control system and method

Details Extruder viscosity control system and method Extruder viscosity control system and method

1983-09-22

1988-01-26

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264 407, 425143, 425145, B29B 772

Patent

active

047215895

ABSTRACT:
An extruder control system and method controls melt temperature to maintain viscosity of the melt at the die. A constant volumetric flow to the die is delivered by a gear pump, the die is a fixed orifice, and pressure between the gear pump and the die is indicative of viscosity. Changes in pressure are sensed and compensating changes in temperature are effected to return the pressure and, hence, the viscosity to its previous value.

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Penn, W. S., Injection Moulding of Elastomers, 1969, pp. 122-125.
Brydson, J. A., Flow Properties of Polymer Melts, 1970, pp. 47-62.
Harris, Modern Plastics Encyclopedia, 1981-82, "Extrusion Controls and Instrumentation", pp. 260-266.

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