STEEL CORD FOR RUBBER ARTICLE REINFORCEMENT AND PNEUMATIC TIRE USING THE STEEL CORD

摘要

This invention provides a steel cord for rubber article reinforcement which has a cord strength improved by preventing the occurrence of advance breaking of the outermost layer filament in the steel cord having a multitwisted structure, and a pneumatic tire using the steel cord as a reinforcing material. The steel cord for rubber article reinforcement has a multitwisted structure formed by twisting a plurality of strands having a layer twisted structure comprising a core of two or three core filaments (11) and at least one layer of sheath disposed around the core. The gap (x) between filaments (13) constituting the outermost layer sheath of the strand is 0.5 to 4.0% of the diameter (d) of the outermost layer sheath filament (13).