| 摘要 |
PURPOSE: To prevent a defective molding of a rubber roller from developing and, at the same time, realize an easy unloading of a seamless pipe after molding by a method wherein an excessive internal blowing pressure is control at vulcanization molding. CONSTITUTION: In the cavity 16 of a top and a bottom molds 14 and 15 for vulcanization molding, a seamless pipe 11, both end parts of which are plugged by core holding members 12 and 13, is installed, and a spring absorbing means 17 for absorbing the internal blowing pressure of the cavity 16 at the vulcanization molding of the green rubber 24 in the seamless pipe is provided. Further, a pressure reducing means 18 for gradually reducing the equilibrium pressure between the internal blowing pressure of the cavity 16 and the force of the coiled spring 36 of the spring absorbing means 17 is provided. |
