| 摘要 |
PURPOSE:To manufacture a smooth film without generating creases on the film even when thermoplastic resin of comparatively high rigidity such as polyolefin resin is used in the inflation molding. CONSTITUTION:A ring film 4 is formed by extruding resin in the molten state out of a ring die 4, and while the ring film 4 is expanded by gas blown into its inner space 4a while bing cooled, and then its downstream side is immersed in a liquid path 8 to seal the space 4a without using a nip roll. After that, the film is cut along the extrusion direction in the liquid path 8 through slitters 9a and 9b and taken off through guide rolls 10a and 10b. |
