Electric heating – Heating devices – With heating unit structure
Patent
1975-08-04
1977-04-12
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219505, 219548, 252511, 264105, 338 22R, H05B 310
Patent
active
040177157
ABSTRACT:
Described herein are self-regulating heating articles. The article comprises a constant wattage layer and a layer that exhibits a positive temperature coefficient of resistance (PTC layer). At its steady state condition, the heater is self-regulated by the switching or anomaly temperature T.sub.s of the PTC layer. However, the constant wattage layer has a higher resistance at temperatures below T.sub.s and heats first when the article is connected to a source of electrical power. Means are provided to impede the temperature increase in the PTC layer caused by the heating of the constant wattage layer so that it can heat above T.sub.s before the PTC layer rises to T.sub.s and reduces the current flow to the heater. Further increases in temperature render the PTC layer, for most purposes, non-conductive. Specific impeding means include an electrically conductive, but thermally insulating layer and means that provide for non-uniform heating of the PTC layer so that it remains conductive across a part of its thickness.
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patent: 3823217 (1974-07-01), Kampe
J. Meyer, "Glass Transition Temperatures as a Guide to the Selection of Polymers Suitable for PTC Materials," Polymer Engineering and Science, Nov. 1973, vol. 13, No. 6, pp. 462-468.
T905001, Dec. 1972, Day, 264/25.
Horsma David August
Whitney Wells
Mayewsky Volodymyr Y.
Raychem Corporation
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