| 摘要 |
PURPOSE:To obtain a steel cord having proper clearances between strands and excellent in fatigue resistance by twisting plural strands twisted at a fixed pitch in the same twisting direction and at the same pitch using a cylindrical stranding machine. CONSTITUTION:A strand is manufactured by left hand lay for instance, four wires of specified diameter at a fixed pitch using a cylindrical stranding machine. Seven bobbins on which the strands are wound are set to the cylindrical stranding machine making them side strands 2 and core strands 3. Under this condition, these are stranded by left hand lay at nearly the same pitch as above, and taken up by a take-up capstan 11, and wound on a reel 12. In this case, reforming as a steel cord 6 is made by an end plate 8, a reforming pin 9, die 10 etc. Consequently, tendency of each wire is remarkably characteristic, and clearance between wires is generated uniformly, and a stable steel cord 6 of nearly parallel stranding free from deformation can be obtained. |
