| 摘要 |
Semi-circular cover members 17 and 17 having a spring function for opening and closing the openings of pores 15 S are provided on the cavity inner wall side of a porous air vent 15 in order to close the openings of the above pores 15 S while a small space remains between the above cover members 17 and 17 and the openings of the pores 15 S of the porous air vent during vulcanization, whereby the occurrence of the occlusion of the above pores 15 S is reduced and stains adhered to the cavity inner wall side of the mold 10 are removed by physical means such as a blast treatment while the above cover members 17 and 17 are closed at the time of cleaning to remove the stains of the above mold 10 . Further, the above openings are opened as required to allow a cleaning liquid 24 go into the above pores 15 S to clean the above mold 10 and remove stains in the pores 15 S.
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