Twisted electric heating cables and method for manufacturing thereof
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United States of America Patent
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Aug 2, 2011
Grant Date -
Jul 30, 2009
app pub date -
Nov 13, 2006
filing date -
Nov 13, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed herein is an electric heating cable which is used in an electric heating apparatus and minimizes an electromagnetic field effect. The electric heating cable is manufactured by twisting first and second electric heating strands in three axial directions. Each electric heating strand includes a core wire comprising a stranded wire of a resistor, and an insulating sheath made of fluorine resin. According to the invention, the electric heating cable is resistive to untwisting in a free state even if no adhering means is used, and is compactly twisted, so that the electric heating cable maintains a secured state and has superior flexibility, while reducing leakage flux, and the electric heating cable has a reduced outer diameter and is light, so that it is useful for a thin electric heating apparatus, and incurs a low manufacturing cost.
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