Ceramic heater roller with thermal regulating layer

Details Ceramic heater roller with thermal regulating layer Ceramic heater roller with thermal regulating layer

1993-06-02

1995-04-18

Evans, Geoffrey S.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219216, 219548, 427453, G03G 1520

Patent

active

054080703

ABSTRACT:
A thermal conduction roller for use in industrial and office equipment includes a ceramic heater layer and a second ceramic layer disposed in between the ceramic heater layer and the core. The second ceramic layer has a resistance characteristic such that resistance of the roller decreases with heating to approximately the same order of magnitude as resistance in the longitudinal direction. This causes electrical current to be diverted from the ceramic heater layer to limit the temperature in that layer and any outer layer contacting a work object. The resistance of the second ceramic layer is controlled in part by controlling the parameters of plasma spraying process, including hydrogen secondary gas flow.

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