摘要 |
PURPOSE: Steel cord for reinforcing contact between rubber and tire is provided, to improve the rubber permeation and the rubber adhesion and to reduce the manufacturing process. CONSTITUTION: The steel cord (1) comprises an innermost layer (2), a middle layer (3), an outermost layer (4) and a spiral wrap (5), wherein the innermost layer (2) comprises three strands of filaments (2a) and is twisted along any one direction with the twist frequency of 5-18 mm; the middle layer (3) comprises 8 strands of filaments (3a), is twisted along any one direction with the twist frequency of 5-18 mm, and has the same twist direction and frequency to those of the innermost layer (2); the outermost layer (4) comprises 13 strands of filaments (4a), is twisted along any one direction with the twist frequency of 10-25 mm, and has the same twist frequency to those of the innermost layer (2) and the middle layer (3) or the larger one and the opposite twist frequency to those of the innermost layer (2) and the middle layer (3); and the spiral wrap (5) comprises one strand of filament and is twisted along opposite direction to that of the outermost layer (4), with the twist frequency of 3-10mm. |