| 摘要 |
PURPOSE: To provide a method for manufacturing a stronger tire which is achieved with a better connection adhesion between a bead core metal and an elastomeric material rubber covering the metal, as well as between the rubber forming the covering portion and the other rubber parts forming the tire bead. CONSTITUTION: In the manufacture of a tire, a covering structure 6 is pre- associated with each bead core, the covering structure 6 consists of a sheet 7 made of unvulcanized elastomeric material wrapped around the bead core, and a strip of unvulcanized rubberized fabric 8 reinforced with heat-shrinkable material cords, wound around the elastomeric material sheet 7. The bead cores 3 are subsequently assembled with other tire components, and a tire vulcanization step is carried out. During this step chemical bonding between the elastomeric sheet 7 and the bead core 3 is achieved, and the bonding is promoted by the simultaneous shrinkage of the cords provided in the rubberized fabric strip 8. |
