Patent ID: 9327555
Filing Date: 2016-05-03
CPC Classification: B60C,D07B,Y10S,Y10T

Claim Text:
1. A steel cord for reinforcing rubber articles with a multi-twisted structure comprising a core strand and a plurality of sheath strands, wherein the core strand is formed by twisting a plurality of filaments, wherein each of the sheath strands is formed by twisting a plurality of filaments, wherein the core strand is constituted of an at least three-layer-twisted structure formed by twisting core filaments and sheath filaments, wherein the multi-twisted structure is formed by twisting the plurality of sheath strands around the core strand, wherein the lowest tensile breaking strength of filament bs (N) and the tensile breaking strength of steel cord Bc (N) satisfy the relationship represented by the following formula: wherein there are seven to nine sheath strands twisted around the core strand, and wherein the core strand has a structure of 3+9+11.