| 摘要 |
PURPOSE:To vent during vulcanizing smoothly and leave no residues of vulcanized rubber by utilizing a pore forming component formed by bonding each of the ends of tapered metallic components and buried in a rib and drawing rubber out of both ends of said pores after vulcanizing. CONSTITUTION:As the central part of a pore forming component 8 is held firmly to a rib 16, the same moves from a core 1 to a mold 15 and its both ends come out of a filling material and protrude out of the outer face of the rib 16. Then, the pore forming component 8 protruding out of the outer face of the rib 16 is drawn out of the rib 16. By vulcanizing a raw tire by means of said mold 15, gas and air generated during vulcanizing are drawn out and also raw rubber flowing from the both openings into a vent hole 17 is cut in the central step section of the vent hole 17 and drawn out when removing the tire, to leave no residues of rubber in the vent hole. |
