| 摘要 |
PURPOSE:To simplify the steps and to improve the quality, by using a mold for vulcanizing that defines a molding space corresponding to the shape of the aimed item, and filling said space with an unvulcanized rubber followed by vulcanization. CONSTITUTION:When an unvulcanized rubber that has been heated to be plasticized into a fluidized state is injected via an injection section 11 from a quantitative injection apparatus 12 connected to a mold, the injection pressure raises gradually the movable mold until a stocking section 5 is filled with the unvulcanized rubber. When a press pressure is applied to lower the movable mold 2, the unvulcanized rubber 40 in the stocking section 5 is compressed and moved into a mold space 6 to fill it. With both molds closed completely, a prescribed heating is carried out, and after completion of the vulcanization, the molded and vulcanized bladder is removed from the molds. At this time, although the rubber of a part 10a at an annular introduction space 13 and an injection hole 10 has been hardened, since a part 10b positioned outer than the part 10a has not yet been hardened, the molding and vulcanization for the next bladder can be immediately carried out if the hardened rubber part is removed. |
