Method of controlling an extruder

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material

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Details

264 407, 264176R, B30B 1514, B30B 1520, B29F 300

Patent

active

041029585

ABSTRACT:
An extruder apparatus control system wherein a temperature corresponding to that of the extrusion material is sensed at each of a series of zones extending along the apparatus extrusion chamber and also the velocity of the apparatus ram. The control system includes a command device for providing operating commands corresponding to a selected operating mode of the apparatus and a velocity command corresponding to a desired velocity of the ram for the selected operating mode. From these operating commands a controller establishes for a selected operating mode, a series of temperature set points, each corresponding to the desired temperature at one of the series of zones and from the velocity command, a velocity set point representing the desired velocity. Thereafter, the control system compares the set points with the sensed values and makes corrections as required to achieve and maintain an equality between them.
The control system allows the extruder apparatus to be changed from one operating mode to any other operating mode and also has provision for monitoring the temperature of the output extrusion material and if different from the desired values, the temperature set points are altered. Also, the pressure of the output extrusion material is monitored and, if necessary, the velocity of the ram is adjusted to maintain the pressure within safe limits. A further provision is made for sensing different malfunctions as they occur.

REFERENCES:
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patent: 3721512 (1973-03-01), Ma et al.
patent: 3728056 (1973-04-01), Theysohn
patent: 3733059 (1973-05-01), Pettit
patent: 3792134 (1974-02-01), Paulson
patent: 3840312 (1974-10-01), Paulson et al.
patent: 3924840 (1975-12-01), Nelson
patent: 3937776 (1976-02-01), Hold et al.

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