Shape memory cords for reinforcing pneumatic tyres,...

D - Textiles – Paper – 07 – B

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D07B 1/06 (2006.01) B60C 9/00 (2006.01) D07B 5/00 (2006.01)

Patent

CA 2250441

Process for the manufacture of a reinforcing fabric for articles made from rubber, such as pneumatic tyres, conveyor belts flexible tubes, and similar, comprising a plurality of metal cords orientated parallel to each other in a single direction and in which each cord comprises metal wires wound spirally around each other, wherein at least one of the wires of the cord consists of a shape memory material. During the phase of incorporation of the cords into the elastomeric material, the shape memory wire tends to recover the shape memorized initially and, by means of the force generated during this recovery, transmits by friction to the surrounding wires forces tending to shorten the pitch of the cord with spacing of each wire from the next, resulting in good penetration of elastomeric material between the wires. The closure of the cord is maintained in the subsequent heat cycles, owing to the memory degradation characteristics imparted to the wire. The invention is particularly suitable for fabrics forming belt layers and casing plies in pneumatic tyres.

Procédé de fabrication d'un tissu de renforcement pour articles en caoutchouc, par exemple des pneumatiques gonflables, des courroies transporteuses et des tubes souples. Le tissu est composé de plusieurs câbles métalliques orientés parallèlement dans la même direction. Chaque câble est constitué de fils métalliques enroulés en spiral l'un autour de l'autre, au moins un des fils du câble étant composé d'un matériau à mémoire de forme. € l'étape de l'intégration des câbles dans le matériau élastomère, le fil à mémoire de forme tend à reprendre sa forme initiale et, grâce à la force générée pendant la reprise de forme, il transmet aux fils avoisinants des forces qui tendent à réduire le pas du câble avec espacement entre chaque fil, ce qui permet au matériau élastomère de bien pénétrer entre chaque fil. La soudure du câble est assurée par des cycles de chauffage subséquents, grâce aux caractéristiques de dégradation de la mémoire de forme ainsi conférées au fil. L'invention est particulièrement utile pour les tissus constituant les couches de ceintures et les plis de carcasses de pneus.

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