| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel cord excellent in durability by preventing the metal fatigue destruction of its core by improving the fatigue resistance of its core filament, and a pneumatic tire by using the steel cord. SOLUTION: This steel cord has a 1x19 structure obtained by twisting the core filament 14 and sheath filaments 15, 16 in the same direction and same pitch. The core filament 14 has a high tensile strength by≥5 % higher than those of the sheath filaments 15, 16 and≥60 % knot strength-holding rate, and the ratio of the diameter dc of the core filament to the diameter ds of the sheath filament satisfies the relationship of 1≤dc/ds≤1.15. COPYRIGHT: (C)2006,JPO&NCIPI
|
