Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1979-12-13
1981-02-24
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219424, 219425, 219523, 219530, 219535, 219544, 219510, 222146HE, 425144, 336146, F27D 1400
Patent
active
042530113
ABSTRACT:
A plastic injection molding system having a temperature controlled electric heater element.
The heater element is formed by disposing a pair of heater wires and a pair of thermocouple wires and a powdered mineral material in a metal sheath which is subjected to repeated drawing and annealing operations and is then cut to a desired length after which at one end, the heater wires are welded together and the thermocouple wires are welded to the sheath and the sheath is welded to form a closed end wall. At the opposite end, the heater and thermocouple wires are connected through connection means and connection wires to a current supply and a temperature sensing circuit. The sheath is in the form of a rightly wound helical coil structure and is installed in direct heat transfer engagement on a cylindrical surface of a metal part which has an axially extending plastic flow passage therein. The metal part may be in the form of a runnerless plastic bushing and a cap may be provided having an internal surface spaced from the outside of the helical coil structure.
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Mayewsky Volodymyr Y.
Tempco Electric Heater Corporation
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