| 摘要 |
PURPOSE:To attain high stability for the dimensions of a tire, by making its carcass ply of nylon cords. CONSTITUTION:In a tire, bead wires 2 are provided at both the sides of a carcass ply layer 1 made of single or plural plies of woven cords and curved as an arc. A breaker layer 4 is provided on the crown portion 3 of the carcass ply layer 1 to reinforce it. The layers 1, 4 are covered with a rubber layer 5. The carcass play is made of nylon 6. To prepare the nylon 6, nylon of 8.0 or more in relative viscosity is spun at the rate of 2,000-4,500m/min and extended to at least 85% of the maximum extension ratio and provided with lower and upper twistings. |
