| 摘要 |
PROBLEM TO BE SOLVED: To provide a tension member, having little agglutination among single yarns, having excellent performance in tensile strength and variation.SOLUTION: Where the longest diameter of a fiber cross section is denoted as a and the shortest diameter is denoted as b, the earphone cord uses for a core thread a melt-anisotropic aromatic polyester fiber having a cross section whose ellipticity f represented by Formula (1) below satisfies 0<f<0.5. f=(a-b)/a --- (1) |
