Two-layer multi-strand cords having very low, low and medium moduli

US11346049B2 · kind B2 · utility

Assignee

• COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN · FR

Inventors

• Emmanuel Clement · Clermont-Ferrand, FR
• Romain Barbat · Clermont-Ferrand, FR
• Marianna Chevalley · Clermont-Ferrand, FR
• Alexandre Gianetti · Clermont-Ferrand, FR
• Stephane Laurent · Clermont-Ferrand, FR

Key dates

• Filing date: Dec 19, 2018
• Grant date: May 31, 2022
• Expiry date: Apr 1, 2039

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D07B2501/2046
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

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 95≤MC≤175, where MC=(J×MI+L×ME)/(J+L); MI=200×cos4(α)×[Q×(D1/2)2×cos4(β)+P×(D2/2)2×cos4(δ)+N×(D3/2)2×cos4(γ)]/[Q×(D1/2)2+P×(D2/2)2+N×(D3/2)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′, and D3 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′), δ is the helix angle of each intermediate thread (F2) and γ and γ′ are the helix angle of each external thread (F3, F2′).