Verstärkungskabel aus einer Formgedächtnislegierung für Elastomererzeugnisse, insbesondere für Luftreifen, und Luftreifen mit solchen Kabeln

摘要

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 (1) orientated parallel to each other in a single direction and in which each cord comprises metal wires (4) wound spirally around each other, wherein at least one (3) of the wires of the cord consists of a shape memory material. During the phase of incorporation of the cords (1) into the elastomeric material, the shape memory wire (3) tends to recover the shape memorized initially and, by means of the force generated during this recovery, transmits by friction to the surrounding wires (4) forces tending to shorten the pitch of the cord (1) with spacing of each wire (4) from the next, resulting in good penetration of elastomeric material between the wires (4). The closure of the cord (1) 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.