| 摘要 |
<p>The present invention relates to a method of producing a pneumatic tire in which, while using a cord material of a secondary belt layer having larger thermal shrinkage rate than that of the primary belt layer to effectively suppress the radial expansion of a tire and advantageously improve cutting-resistance of a tread as in the conventional tire, deterioration of durability of belts including the primary belt and the secondary belt can be effectively prevented without increasing the tire weight, the pneumatic tire having: a pair of bead cores; a carcass troidally extending between the bead cores; a primary belt including a plurality of primary belt layers disposed on the outer peripheral side of the carcass in the crown region thereof; and a secondary belt including at least one secondary belt layer disposed on the outer peripheral side of the primary belt, each primary belt layer being formed by aromatic polyamide cords having a spirally wound structure, the secondary belt layer being formed by a ribbon-shaped strip of organic fiber cords having a larger thermal shrinkage rate than that of the aromatic polyamide cords, the ribbon-shaped strip being bent in a zigzag shape at positions corresponding to respective side ends of the secondary belt layer to extend in the circumferential direction, the method comprising: folding the ribbon-shaped strip 22 in a region R, in a developed plan view of a material 21 forming the secondary belt layer, between a side end e of the forming material 21 and a position distanced from the side end toward the tire equatorial side by 1/4 of the overall width of the forming material, such that the thus bent ribbon-shaped strip 22 extends in a curved manner to build a green tire.</p> |
