| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel cord which is a zero-degree belt cord having moderate elongation characteristics following to the expansion in the diametral direction of a tire in a vulcanizing treatment during molding of the tire, reducing the elongation after molding of the tire and suppressing the expansion of the tire in the radial direction during running. SOLUTION: The steel cord 1 has an n×m open structure without a core strand. The external tangent line shape S2 of strands 2 has a nearly elliptical shape in nearly the same direction in the longitudinal direction. The external tangent line shape S1 of the cord 1 is a nearly elliptical shape in the same direction as the elliptical direction of the strands. The steel cord is characterized as having a structure as follows. The flatness of the strands 2 and steel cord 1 is 1.15-2.70 and the adjacent mutual two wires and the mutual strands contact or approach in both terminal regions in the major axis direction of the strands 2 and steel cord 1 and separate in other regions. The elongation when applying 50 N tensile load is 1.2-3.0%. COPYRIGHT: (C)2007,JPO&INPIT
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