Hybrid cables, a process for obtaining such and composite fabrics incorporating such
Hybrid cables, a process for obtaining such and a composite fabric usable in a tire incorporating the hybrid cables are disclosed. A tire and a mounted assembly which each incorporate such a composite fabric is also disclosed. The hybrid cable has a ratio of final tangent modulus:initial tangent modulus greater than 10. This hybrid cable consists of a textile core of an initial modulus of less than 900 cN/tex and a textile wrap of an initial modulus greater than 1300 cN/tex which is helically wound around the textile core.
1. A hybrid cable, consisting of a straight textile core having an initial tensile modulus of less than 900 cN/tex, and a single textile wrap having an initial tensile modulus of greater than 1300 cN/tex which is wound in a helix around said core, wherein the hybrid cable has:
a force/elongation curve having a transition point corresponding to an elongation of between 1% and 7%;
a tensile modulus which is substantially equal to the initial modulus of said core below said transition point, and which is substantially equal to the initial modulus of said wrap beyond said transition point; and
a ratio of final tangent modulus : initial tangent modulus greater than 10.
2. A hybrid cable according to claim 1 , wherein said ratio is greater than 12.
3. A hybrid cable according to claim 1 , wherein said core has an elongation at break greater than 10%.
4. A hybrid cable according to claim 1 , wherein said transition point corresponds to an elongation of between 2% and 4%.
5. A hybrid cable according to claim 1 , wherein said core and said wrap are each formed of a single thread or a plurality of threads twisted together, each thread being formed either of a spun yam based on a multitude of elementary filaments, or of a monofilament.
6. A hybrid cable according to claim 5 , wherein said core is formed of a single spun yam and said wrap is formed of one or more spun yams twisted together.
7. A hybrid cable according to claim 5 , wherein said core is formed of a plurality of spun yarns twisted together and said wrap is formed of one or more spun yarns twisted together.
8. A hybrid cable according to claim 5 , wherein said core is formed of a monofilament and said wrap is formed of a single spun yam or of a plurality of spun yams twisted together.
9. A hybrid cable according to claim 5 , wherein said core is formed of a single spun yarn or a plurality of spun yarns twisted together and said wrap is formed of a monofilament.
10. A hybrid cable according to claim 5 , wherein said core and said wrap are each formed of a monofilament.
11. A hybrid cable according to claim 1 , wherein said core is formed of a polymer selected from the group consisting of aliphatic polyamide, aliphatic polyester, and rayon.
12. A hybrid cable according to claim 1 , wherein said wrap is formed of a polymer selected from the group consisting of aromatic polyamide, aromatic polyester, cellulose of liquid-crystal origin, and cellulose derivative of liquid-crystal origin.
13. A hybrid cable according to claim 1 , wherein said core and said wrap are both twisted spun yarns.
14. A hybrid cable according to claim 1 , wherein said core and said wrap are spun yarns which are twisted in opposite directions.
15. A hybrid cable according to claim 1 , wherein said core is formed of aliphatic polyamide and said wrap is formed of aramid.