Electrical devices comprising ptc elements

Details Electrical devices comprising ptc elements Electrical devices comprising ptc elements

H - Electricity

05

B

309/84

H05B 3/14 (2006.01) H05B 3/34 (2006.01)

Patent

CA 1234597

ABRIDGEMENT A laminar electrical heater in which at least one of the electrodes is in the form of an elongate element forming part of a fabric and which comprises a PTC element, e.g. of a conductive polymer, to render the heater self-regulating. Preferably the heater is prepared by weaving together (a) a first elongate element comprising a first electrode and a layer of PTC conductive polymer surrounding that electrode, and (b) a second elongate element comprising a second electrode. The resulting fabric can if desired be lami- nated to a sheet of a ZTC conductive polymer. A shrinkable fabric heater can be made by incorporating a heat-shrinkable non-conductive filament into the fabric, perpendicular to both electrodes, and is useful for example for enclosing splices in telephone cables.

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