| 摘要 |
PROBLEM TO BE SOLVED: To develop an apparatus and a method for manufacturing a pneumatic tire for providing the tire having excellent uniformity by suppressing the unevenness of the circumferential thickness of a side tread by primary shaping (radial expansion). SOLUTION: The apparatus for manufacturing the pneumatic tire comprises an extrusion molding machine having a pair of molding rolls 1, 2 for forming a rubber 4 for a side tread by extruding a rubber 3 fed from a rubber kneading step. In this case, the rolls 1, 2 each has a truncated conical shape substantially gradually increasing in the diameter of the roll from one of the ends 1a, 2a toward one of the other ends 1b, 2b. The rolls 1, 2 are oppositely disposed at a predetermined interval at the ends 1a, 2a and the other ends 1b, 2b. The rubber 3 is rotated so as to be extruded in one direction. Thus, the rubber 4 for the side tread bend at a predetermined curvature is formed.
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