| 摘要 |
To wind a rubber strip material around a forming drum, a rubber strip material S extruded from a die 2 of an extruder 1 is spirally wound by an applicator 6 and formed around the forming drum 5 which is being rotated. In the forming operation, the peripheral speed Vd of the forming drum 5 is set lower than the extrusion speed Ve of the rubber strip material S from the die 2 of the extruder 1, that is, to a peripheral speed of 0.6 to 0.95 times the extrusion speed Ve and preferably to a peripheral speed about 0.9 times the extrusion speed Ve. With this arrangement, the rubber strip material stretched by die swelling can be contracted, a tire structural member can be formed around the forming drum with high accuracy at all times independently of the kind of the rubber strip material, and workability as well as shape stability after the rubber strip material is formed can be enhanced.
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