| 摘要 |
PURPOSE:To prevent a bulged resin part from being formed to the inner wall of a molded form and to secure uniform inside diameter by spilitting a mandrel into a first and second mandrels and molding the main body of the molded form with the first mandrel and a mold, and utilizing the second mandrel to form a flange. CONSTITUTION:A second mandrel 12 is positioned on the line of the descending direction of a parison 6 in the lower part of the flange forming parts 7, 7 of molds 3, 4 and fitted to the outer circumference of a first mandrel 11 in a slidable state. In such a state, firstly the molds 3, 4 are moved to the directions shown in the arrows (a) and mold clamping is performed. Air is blown into the cavity 9 of the molds 3, 4 at the same time as mold clamping thereof and molding of a body 1 exclusive of a flange is performed. Then the second mandrel 12 is moved to the upper part (the direction shown in an arrow (c)). The lower end of the parison 6 is pushed into the flange forming parts 7 to form a flange 2. Thereafter, the molds 3, 4 are opened and the first and second mandrels 11, 12 are lowered to the lower part. The molded form having the flange 2 is taken out. |
