| 摘要 |
PURPOSE:To form effectively thermoliquid crystalline resin by achieving inflation forming, while rotating in a specified rotation number the rotary die wherein a die lip and a core rotate in reverse directions mutually. CONSTITUTION:The rotation numbers of a movable lip 2 and a core 3 are regulated in a value equal to or more than the rotation index S shown by a general formula (G: annular slip width, MFI: melt flow index, t: film thickness, BUR: flow up ratio, D: annular slip diameter) and equal to ten times of S value or less. The thermoliquid crystalline thermoplastic resin is fed from a resin path 4, while rotating the movable die lip 2 and the core 3 in reverse directions mutually, and inflation forming is achieved. The thermoliquid crystalline resin whose forming has been difficult, is orientated equally in longitudinal and transverse direction, and the film excellent in tensile strength is obtained. |
