| 摘要 |
PURPOSE: To shorten the time required for an exhaust process by completing the exhaust process for exhausting pressure gas from a bladder inserted into a green tire in a mold when the pressure in the bladder becomes lower than the set pressure. CONSTITUTION: When a tire is vulcanized, first an unvulcanized green tire 9 is carried into a bottom force 3, and then a top force 4 is lowered and the green tire 9 is fitted in a cavity. Then, pressure gas is fed into a bladder 11 inserted into the green tire 9, and a molding process is carried out. At that time, a pressure retaining process for retaining the pressure in the bladder 11 at the given pressure is carried out by closing a feed valve 13 when the pressure in the blade 11 reaches the given pressure, and when the set time, for example, 8 minutes, is passed from the start of the pressure retaining process, an exhaust process is started. The pressure gas in the bladder 11 is exhausted by opening an exhaust valve 14, and when the exhaust timing becomes more than the set exhaust time and the pressure measurement value is less than the set pressure value, the step is moved over to a stabilizing process. |
