| 摘要 |
PURPOSE:To provide a molding being excellent in the impact resistance and the appearance by using an inert fluid to cool the extruded parison. CONSTITUTION:Gas such as nitrogen, carbon dioxide, helium, argon and neon and water, etc., are used as inert fluid. These are used individually or at least two kinds in combination. Especially nitrogen and carbon dioxide are preferably used in view of economy. The usage of inert fluid is not especially limited. These are introduced through a conventional introduction path for blowing air. Further, it is effective that the inert fluid is used at the opposite side or both sides of blowing. Pressure for pressing parison on the internal wall of a mold is selected by desired conditions and gage pressure of 2-20kg/cm<2> should be preferable. |
