| 摘要 |
<p>PURPOSE:To provide a high power positive resistance temperature coefficient heating element and a manufacturing method thereof, which has no possibility of generating abnormally over heat, smoke, or fire, with safety and a long life. CONSTITUTION:A positive resistance temperature coefficient heating element is formed by a sheet-shape resistance body 4 of positive resistance temperature coefficient, consisting of conductive fine power and a crystalline polymer, a pair of electrode bodies 5, 6 provided for applying voltage in the thickness direction of the resistance body 4, hot melt layers 7, 8 for externally coating the resistance 14 as well as the electrode bodies 5, 6, an electric insulating layers 9, 10. 2, 2-thio-diethylenebis [3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate] is included in a portion A where the pair of electrode bodies 5, 6 are not overlapped at plane of projection in the thickness direction of the resistance body 4. Formation of a hot zone can be prevented at the portion A, and a positive resistance temperature coefficient heating element of high safety and a long life, and a manufacturing method thereof, are provided.</p> |
