Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1983-02-28
1984-11-06
Thurlow, Jeffery
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
264 406, 425144, 425162, B29F 308
Patent
active
044809816
ABSTRACT:
A system for controlling a temperature of a molten resin in a cylinder of an extruder includes a plurality of temperature detecting elements which are disposed in a wall of the cylinder generally in a plane perpendicular to a longitudinal axis of the cylinder to detect the temperature of the cylinder. The temperature detecting elements are radially spaced by different distances from an inner peripheral surface of the cylinder wall. Detecting devices are provided for detecting an ambient temperature of the extruder and the number of revolutions of a screw of the extruder. A microprocessor unit is programmed to be responsive to detecting signals from the temperature detecting elements and detecting devices to calculate a proper estimated temperature of the molten resin and to calculate a difference between a desired temperature of the resin and the estimated temperature and to determine in accordance with this difference a set temperature of the cylinder wall. A temperature regulating device compares the set temperature with one of the temperatures detected by the temperature detecting elements to produce a temperature control signal in response to which the temperature of the portion of the cylinder where the one temperature detecting element is disposed is brought into agreement with the set temperature.
REFERENCES:
patent: 3733059 (1973-05-01), Pettit
patent: 3751014 (1973-08-01), Waterloo
patent: 3866669 (1975-02-01), Gardiner
patent: 4262737 (1981-04-01), Faillace
patent: 4272466 (1981-06-01), Harris
patent: 4290986 (1981-09-01), Koschmann
Ito Katuhiko
Iwata Mitsuo
Nakamoto Teruyuki
Sano Hideo
Sekine Nobutaka
Fujikura Ltd.
Thurlow Jeffery
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