| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the movement of a core wire and the loosening of a steel cord. <P>SOLUTION: The steel cord is constituted as follows. A side wire sw is preformed into a helical shape by running the side wire sw along a plurality of pins arranged with difference of elevation in a preformer. The resultant side wire is twisted by prescribed turns in the same direction as the twisting direction of a strand to be twisted at a twisting machine, and twisted back by the prescribed turns to impart a residual turning stress in the same direction as the twisting direction to the side wire sw in a turning stress-regulating device. The steel cord tw is formed by twisting the core wire cw with the side wire sw by the twisting machine. The preformed rate of helical preforming is 70% or more and less than 100%, and the residual turning stress is preferably 2 turns or more and 4 turns or less. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
