| 摘要 |
PURPOSE:To reduce difference in degrees of vulcanization in a thick part and a thin part and to attempt to improve quality of a product i.e., a tire, by providing a path for a heating medium both ends of which are only opened on the outer face of a vulcanization mold, an intermediate part of which is passed through on the neighbor of a thick part of a raw tire and wherein a heating medium is passed through, in the vulcanization mold. CONSTITUTION:A raw tire 6 is put in a vulcanization mold 27 and the whole vulcanization mold 27 is heated by feeding a heating medium for vulcanization of high temp. and high pressure in a closed space 22. If the raw tire 6 is large, a thick part, a bead part 11 and a shoulder part 35 of the raw tire 6 have large heat capacities and a large amt. of heat is therefore taken from parts of the vulcanization mold being brought into contact with them. Therefore, the temp. tends to drop more than the temp. of other parts, e.g., a side wall part 9. However, as a number of outer heating medium paths 33 and 34 and inner heating medium paths 36 and 37 are provided in the vulcanization mold 27, a heating medium in the closed space 22 is passed through them. Heat transfer area in the neighbor of the bead part 11 and the shoulder part 35 is thereby increased and the temp. becomes close to the temp. of other parts in the vulcanization mold 27. Vulcanization of the bead part 11 and the shoulder part 35 is thereby accelerated. |
