| 摘要 |
PROBLEM TO BE SOLVED: To obtain a steel cord for reinforcing a tire having excellent rubber permeation, capable of controlling break, buckling, etc., by twisting a core wire and plural side wires in the same direction at a time and providing the core wire with an approximately spiral habit. SOLUTION: One of three wires having 0.15-0.40 mm wire diameter d is used as a core wire 1 and the residual two wires are used as side wires 2. The wires are twisted at 5-20 mm twisting pitch P in the same direction at a time to form a cord 3. The core wire 1 has an approximately spiral habit composed of a habit pitch P1 mm and a habit outer diameter d1 mm satisfying the relations P1=0.1 P to 0.7 and d1=(d+2/100) to (d+2/10) and a habit outer diameter d1 mm. In the cross section of the cord, a state in which the three core wires are brought into contact with one another or in an adjacent state and a state in which the three wires are arranged in a line with placing the core wire 1 at the center are repeated at approximately 1/2 pitch in the longer direction in the same orientation to give the objective steel cord for reinforcing a tire.
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