Multilayer steel cord for tyre casing

D - Textiles – Paper – 07 – B

Patent

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Details

D07B 1/06 (2006.01) B60C 9/08 (2006.01)

Patent

CA 2377170

The invention concerns an unsaturated external multilayer cable, for use as reinforcing element of a tyre casing reinforcement, comprising a core having a diameter d0 enclosed with an intermediate layer (referenced C1) of six or seven wires (M = 6 or 7) of diameter d1 spirally wound together by a step p1, said layer C1 being itself enclosed by an external layer (referenced C2) of N wires of diameter d2 spirally wound together by a step p2, N being less by 1 to 3 than the maximum number Nmax of wires capable of being wound in one ply around the layer C1, said cord having the following characteristics (d0, d1, d2, p1 and p2 in mm): (i) 0.14 < d0 < 0.28; (ii) 0.12 < d1 < 0.25; (iii) 0.12 < d2 < 0.25; (iv) when M = 6: 1.10 < (d0/d1) < 1.40; when M = 7: 1.40 < (d0/d1) < 1.70 (v) 5 pi (d0 + d1) < p1 < p2 < 5 pi (d0 + 2d1 + d2); (vi) the wires of layers C1 and C2 are wound in the same twisting direction. The invention further concerns articles or semi-finished plastic and/or rubber products reinforced with said multilayer cord, in particular tyres for industrial vehicles, more particularly heavy truck tyres and their outer casing reinforcement plies.

Câble multicouches à couche externe insaturée, utilisable comme élément de renforcement d'une armature de carcasse de pneumatique, comportant une âme de diamètre d0 entourée d'une couche intermédiaire (notée C1) de six ou sept fils (M = 6 ou 7) de diamètre d1 enroulés ensemble en hélice selon un pas p1, cette couche C1 étant elle-même entourée d'une couche externe (notée C2) de N fils de diamètre d2 enroulés ensemble en hélice selon un pas p2, N étant inférieur de 1 à 3 au nombre maximal N max de fils enroulables en une couche autour de la couche C1, ce câble présentant les caractéristiques suivantes (d0, d1, d2, p1 et p2 en mm): (i) 0,14 < d0 <0,28; (ii) 0,12 < d1 < 0,25; (iii) 0,12 < d2 < 0,25; (iv) pour M = 6: 1,10 <(d0/d1) < 1,40; pour M = 7: 1,40 <(d0/d1) < 1,70; (v) 5 ~ (d0 + d1) < p1 < p2 < 5~ (d0 + 2d1 + d2); (vi) les fils des couches C1 et C2 sont enroulés dans le même sens de torsion. L'invention concerne en outre les articles ou produits semi-finis en matière plastique et/ou en caoutchouc renforcés par un tel câble multicouches, notamment les pneumatiques destinés aux véhicules industriels, plus particulièrement les pneumatiques Poids-lourds et leurs nappes d'armature de carcasse. Image

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