Hybrid elastic cable and process for manufacturing such a cable

A hybrid elastic cable comprising at least one filament yarn of a first type and at least one filament yarn of a second type, the filament yarn of the first type having a lower degree of tenacity than that of the filament yarn of the second type, and the filament yarn of the second type having a lower degree of elasticity than that of the filament yarn of the first type;

• the filament yarn of the second type, when a predetermined maximum rate of elongation of the hybrid cable is reached, is fully elongated and the filament yarn of the first type is wound in a helix around the filament yarn of the second type, wherein the filament yarn of the first type with the said maximum rate of elongation is wound in a helix around the filament yarn of the second type with a specific number of turns per linear metre of the cable ranging between nsE−15% and nsE+15%, nsE being determined based on the following formula:
• n
• sE
• =
• 1000
• π
• 
• (
• ϕ
• e
• +
• ϕ
• K
• )
• ×
• K
• max
• ×
• (
• K
• max
• +
• 200
• )
• K
• max
• +
• 100
• in which φe is the diameter in mm of the filament yarn of the first type at rest, φK is the diameter in mm of the filament yarn of the second type, and Kmax is the predetermined maximum rate of elongation of the hybrid cable,
• the filament yarn of the first type moreover being also twisted about itself with a specific number of distinct turns about itself per linear metre of the cable ranging between nsE and 3×nsE, with the distinct turns about itself of the filament yarn of the first type being wound in the opposite direction from that of the said helix,
• in a manner such that when the hybrid cable is at rest, the filament yarn of the second type is wound in a helix around the filament yarn of the first type, substantially without the separation of the yarn of the second type or deformation of the hybrid cable.