Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1980-08-04
1981-06-09
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
165 14, 165 27, 165 30, 366 79, 366142, 366145, 366149, 425144, 425379R, B29F 100
Patent
active
042724660
ABSTRACT:
A system and method of temperature control for a plastics extruder uses a deep well sensor and a shallow well sensor in each temperature control zone along an extruder barrel. The temperature indications of these sensors are not combined. The shallow sensor detects temperature near the barrel surface. An associated controller compares the sensor temperature with a manually preset temperature set point. The differences between the detected and set temperature are used by the controller to effect heating or cooling of its associated temperature control zone. Each deep sensor is located proximate the bore in which the plastic is moved. The deep sensor temperature indication is compared with the set point of a second controller. Variations of the deep temperature from the set point generate an error signal that is applied to the first, shallow well temperature controller to vary its set point. A melt temperature control addition can be made by adding a melt temperature sensor directly in the path of melt between the extruder screw and the extrusion die. A further controller compares its set point with that of the melt temperature and modifies the deep temperature controller set points of the several zones along the extruder barrel to correct the melt temperature.
REFERENCES:
patent: 3698844 (1972-10-01), Grimm
patent: 3733059 (1973-05-01), Pettit
patent: 3751014 (1973-08-01), Waterloo
patent: 3822867 (1974-07-01), Evans
patent: 3866669 (1975-02-01), Gardiner
patent: 4197070 (1980-04-01), Koschmann
Harrel Incorporated
Thurlow Jeffery R.
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