High elongation steel cord with preformed strands
AssigneeNV Bekaert SA
InventorsJavier Del Río Rodriguez, Steven Wostyn
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Abstract
A steel cord (30) with a high elongation at break of at least 5% comprises n strands (20), each of said strands (20) has m filaments (10) twisted together, n ranges from 2 to 7. m ranges from 2 to 9. The strands and the filaments are twisted in a same direction. The lay length of the cord is Lc and the lay length of said strand is Ls. The ratio of Ls to Lc (Ls/Lc) ranges from 0.25 to 1. Lc ranges from 16 mm to 26 mm. The strands are helically preformed. The E-modulus of the cord is more than 150000 N/mm2. The helical preforming of the strands allows to obtain a high elongation at break and a high E-modulus despite its long lay length Lc.
Claims11
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 has 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, the lay length of said cord being Lc and the lay length of said strand being Ls, characterized in that the ratio of said Ls to said Lc (Ls/Lc) ranges from 0.25 to 1, said Lc ranges from 16 mm to 26 mm, the E-modulus of said steel cord is more than 150000 N/mm2.
Dependencies are inferred from the claim text.