Patent ID: 7987659

Claim:
A method for manufacturing a twisted electric heating cable, comprising: inputting and twisting first and second electric heating strands in angled arrangement, wherein an angle between a first axial line along which the first and second electric heating strands are twisted and a second axial line along which the first electric heating strand is input is equal to an angle between the first axial line along which the first and second electric heating strands are twisted and a third axial line along which the second electric heating strand is input, and wherein the second axial line along which the first electric heating strand is input, the third axial line along which the second electric heating strand is input, and the first axial line along which the first and second electric heating strands are twisted are simultaneously rotated in the same direction such that the twisted first and second electric heating strands are resistive to untwisting so as to maintain the twisted state without loosening.