| 摘要 |
PROBLEM TO BE SOLVED: To form the lamination surface with another tire component of a rubber member for tread in which grooves corresponding to the grooves in the circumferential direction of a pneumatic tire are formed in advance in the shape of a plane without unevenness. SOLUTION: A nozzle 1 comprising an upper mold 2 formed with a groove-forming projection 5 and a lower mold 3 with a correction groove-forming projection 6 arranged at an opposite position of the projection 5 is fitted to the rubber discharge opening of an extruder. Unvulcanized rubber is extruded from an opening part 4 formed by the upper mold 2 and the lower mold 3 to mold the rubber member for the tread. The grooves corresponding to the grooves in the circumferential direction are formed in one surface of the rubber member for the tread by the groove-forming projection 5. A recess formed by the correction groove-forming projection 6 is filled and eliminated by rubber pushed out at the time, and the other surface of the rubber member for the tread is formed in the shape of the plane without unevenness. COPYRIGHT: (C)2007,JPO&INPIT |
