Patent ID: 6189309
Filing Date: 2001-02-20
Classification: D07B,Y10S

Abstract:
A steel cord having a three-layer twisted construction consisting of an innermost layer, an intermediate layer, an outermost layer and a spiral wrap, wherein:said innermost layer consists of 3 filaments twisted in one of left or right twist directions while having a twist pitch length of 5 to 18 mm;said intermediate layer consists of 8 filaments twisted in the same twist direction as that of said innermost layer while having a twist pitch length that is the same as the twist pitch length of said innermost layer;said outermost layer consists of 13 filaments twisted in a twist direction opposite to those of said innermost and intermediate layers while having a twist pitch length of 10 to 25 mm and which is no less than those of said innermost and intermediate layers; andsaid spiral wrap consists of a single filament adapted to be wrapped around said outermost layer, thereby preventing said steel cord from being unwound, said filament being twisted in a twisted direction opposite to that of said outermost layer while having a twist pitch length of 3 to 10 mm, so that said steel cord exhibits improved penetration of rubber.