| 摘要 |
PURPOSE: To obtain a steel cord used as a reinforcing material for elastomer products such as pneumatic tires, and to improve the fatigue resistance of tires reinforced with the cord. CONSTITUTION: At least a part of strands is made up of core consisting of a single steel filament and sheath six steel filaments. The core filament is a wire which is so designed that the locus of its section perpendicular to the longer direction of the cord stands ellipsoidally preformed or postformed, having the following parameters: the ratio of the major axis (a) to minor axis (b) for the ellipsoid is 1.1<=(a/b)<=2.3; preformed or postformed rate Rc expressed by the ratio of the preformed or postformed amplitude Lc to the wire diameter (dc):(Lc/dc) is 0.30<=Rc<=1.2; and the preformed or postformed pitch Pc satisfies the relationship: 3.0(dc)/0.34<=Pc<=8.0(dc)/0.34. |
