| 摘要 |
PURPOSE:To make it possible to finish the appearance of a closed part neatly, by blowing a heated and pressurized gas against the side wall of an open end of a blow hole of a hollow molded item obtained by blow molding, and moving the melted part of said side wall to close the blow hole. CONSTITUTION:The top of an expanded part 4 is formed with a blow hole 5 through which a pressure fluid has been introduced when blow molding has been effected. That is, the top of the expanded part 4 is notched to have the shape of a dome, and is formed with a semi-cylindrical expanded cylinder part 6 on the one side wall of the resulting notched part 4a, and the blow hole 5 is open in the top of the expanded cylinder part 6. The blow hole 5 is closed by blowing a heated and pressurized gas and moving the melted resin of the side wall 6 of the open part of the blow hole 5. The temperature of the heated and pressurized gas is suitably selected depending on the material constituting the hollow container 1 and is suitably in the range of 200-600 deg.C. The pressure lies pref. in the range of 100-1,000mm.Aq measured at the part of the side wall of the blow hole 5. |
