| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a pneumatic radial tire for improving load durability and high speed durability by making the most of a characteristic of polyketone fiber. <P>SOLUTION: After imparting an RFL liquid (a resorcinol-formalin-latex liquid) to a polyketone fiber cord having single thread fineness of 0.5 to 7 dtex, when performing heating tensioning processing of a heat set and normalizing, the tension ratio Th/Tn of tension Th in the heat set to tension Tn in the normalizing is set to 1 to 2, and a cord dimension after the heating tensioning processing is extended longer by 2.5 to 5.0% than a cord dimension before the heating tensioning processing, and an unvulcanized tire is vulcanized and molded by molding the unvulcanized tire of using the polyketone fiber cord after the heating tensioning processing for a tire reinforcing part. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
