FIELD: electricity.
SUBSTANCE: sheet heating coil contains a substrate sheet made of an electric insulating material, and wires made of a conductive material and distanced from each other on the substrate sheet. The sheet heating coil contains at least one resistor sheet with the positive temperature coefficient being in an electric contact with the wires and self-heated up in response to electric power supplied by wires. This at least one resistor sheet with positive temperature coefficient can contain a flame retardant and/or a moisture protection film. When the sheet heating coil according to the present invention is used for heating automobile seats or a steering wheel, a passenger sitting thereon feels comfortable, and a driver feels comfortable while holding a steering wheel.
EFFECT: sheet heating coil according to the present invention exhibits excellent flexibility, strength and reliability, and has low manufacturing price.
60 cl, 44 dwg
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