| 摘要 |
PURPOSE:To eliminate the apprehension of the clogging with a molten resin and to guide a pressure fluid introduced under pressure into the molten resin and to discharge the pressure fluid remaining in the hollow part of a molded object within a short time. CONSTITUTION:A pressure fluid is introduced under pressure and discharged through the pressure fluid passage 3 formed by the inner wall of the passage 1 of which the leading end is opened to the space part of an injection mold and the shaft core 2 inserted in the passage 1 so as to be axially movable before and behind. The specific shaft core 2 consisting of a core body 21 and a flange 22 is used and, by moving the leading end part 21a of the core body 21 before and behind within the specific range of the passage 1, the pressure fluid passage can be regulated and, at the same time, the front of the flange 22 is brought into contact with the rear end of the passage 1 and separated therefrom to close and open the pressure fluid passage. |
