| 摘要 |
In the manufacture of a tyre a covering structure (6) is previously associated with each bead core, which structure consists of a sheet (7) made of elastomeric material in a raw state wrapped around the bead core and a strip of rubberized fabric (8) in a raw state, reinforced with heat-shrinkable material cords, wound around the elastomeric material sheet (7). The bead cores (3) are subsequently assembled with other tyre components, and afterwards the tyre vulcanization step is carried out. During this step the chemical bonding between the elastomeric sheet (7) and the bead core (3) is achieved, which bonding is promoted by the simultaneous shrinkage of the cords provided in the rubberized fabric strip (8). <IMAGE> |
