| abstract |
In a conventional bladder consisting of only a rubber sheet, the shape with respect to the inner wall surface of the tire varies during repeated vulcanization molding, and it is necessary to replace the bladder early. In the case of a bladder in which rubber is reinforced by a tire cord, the bladder does not extend much because the tire cord hardly extends, and therefore, it is difficult to favorably follow the inner wall surface of the tire. Therefore, an object of the present invention is to provide a bladder in which the shape of the inner wall surface of the tire hardly varies and which can favorably follow the inner wall surface of the tire. A bladder (10) for pressing an inner wall surface of a tire with a pressurized heat medium during vulcanization molding of a green tire, wherein silicone rubber layers (11, 13) are integrally laminated on both front and back surfaces of a pearl knitted fabric layer (12). Things. Since the pearl knitted fabric layer 12 exhibits good elasticity, it can be stretched together with the silicone rubber layers 11 and 13 to satisfactorily press the green tire. [Selection diagram] Fig. 1 |