Foil element

Details Foil element Foil element

1986-12-10

1989-01-10

Goldberg, E. A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219508, H05B 334

Patent

active

047975377

ABSTRACT:
A foil element for the electric heating of objects comprises a resistance heating coil placed between insulating plastic foils and a sensor coil placed between the plastic foils beside the heating coil. The sensor and heating coils are formed of the same metallic material. The sensor coil is spaced sufficiently far from the heating coil to assure that the sensor coil is heated mainly by heat flowing to or from the object being heated and only slightly by heat directly from the heating coil. The electric resistance of the sensor coil is sensed to determine the temperature thereof. The heating coil is controlled in accordance with the temperature of the sensor coil.

REFERENCES:
patent: 2834862 (1968-05-01), Meyers
patent: 3130289 (1964-04-01), Katzman et al.
patent: 4642887 (1987-02-01), Fredriksson

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