Preparation and Transmission Characteristics of Hybrid Structure Yarns with Nylon fiber for Smart Wear

Twisted Copper Filaments (TCF) were made by a yarn covering process in order to transmit signals and power for electronic textiles. The 560 denier polyurethane filaments were covered in the S-twist direction by urethane-coated copper wires. Two TCF's twisted in the Z direction were further covered in the S direction by nylon filaments to make final hybrid structure yarns (HSY). The HSY prepared was proportionally increased in apparent resistance and showed resistivity of 1.6210– ⁸ Ω·m. The number of ply was critical in terms of resistance variation, showing a linear increase in resistance with ply number. The twist factor, however, was not as significant. Final filaments were found to be changed in resonance frequency mainly due to the change of di-electricity and thus capacitance caused by the nylon covering. It is concluded that while resonance frequency was primarily determined by filament length and dielectric constant of the covering yarns, resonance frequency S11 and S21 were mainly determined by measurement length and ply number.