Patent ID: 8429888
Filing Date: 2013-04-30
Classification: D07B

Abstract:
1. A steel cord with a high elongation at break being at least 5% comprising n strands, said strands being helically preformed, each of said strands having m filaments twisted together, said n ranging from 2 to 7, said m ranging from 2 to 9, said strands and said filaments being twisted in a same direction, a lay length of said cord being Lc and a lay length of said strand being Ls, wherein a ratio of said Ls to said Lc (Ls/Lc) ranges from 0.25 to 1, said Lc ranges from 16 mm to 26 mm, and wherein an E-modulus of said steel cord is more than 150000 N/mm 2 ; and wherein said helically preformed strand has a preformation pitch Ps and a preformation amplitude As, said Ps is 50 to 120 times a diameter D of the filament and said As is 8 to 12 times the diameter D of the filament.