TWO-LAYER MULTI-STRAND CORDS HAVING VERY LOW, LOW AND MEDIUM MODULI

摘要

A two-layer multi-strand cord (60) comprises an internal layer (CI) of the cord made up of J>1 internal strands (TI) and an external layer (CE) of the cord made up of L>1 external strands (TE). The cord satisfies the relationship 100≤MC≤175, where MC=(J×MI+L×ME)/(J+L); MI=200×cos4(α)×[Q×(D1/2)2×cos4(β)+N×(D2/2)2×cos4(γ)]/[Q×(D1/2)2+N×(D2/2)2]; and ME=200×cos4(α′)×[Q′×(D1′/2)2×cos4(β′)+N′×(D2′/2)2×cos4(γ′)]/[Q′×(D1′/2)2+N′×(D2′/2)2], where D1, D1′, D2, D2′ are in mm, α and α′ are the helix angle of each internal and external strand (TI), β and β′ are the helix angle of each internal thread (F1, F1′), and γ and γ′ are the helix angle of each external thread (F2, F2′).