| 摘要 |
PURPOSE:To manufacture a film of high quality having excellent mechanical performance, smooth surface, and no irregular thickness from polymer liquid crystal by extruding a melt or solution of polymer liquid crystal at a mean shearing speed of a bending point or more in the relationship between the viscosity and the shearing velocity of the polymer liquid crystal as a mean extruding speed at the time of extruding from a die. CONSTITUTION:In a method for manufacturing a film from polymer liquid crystal, when polymer liquid crystal is discharged from a die, it is extruded at such a speed as to attain a mean shearing speed of a point (a) or higher where its viscosity is abruptly reduced. The film discharged and obtained in this range has remarkably excellent surface roughness and thickness irregularity obtained by discharging it at a mean shearing speed lower than the point (a) or lower. A die lip liquid contact part is desirably mirror-finished. Further, the so-called land length of the lip liquid contact part is desirably relatively shorter such as approx. 0.5 - 3mm to be desirably to obtain the higher shearing speed at the point (a) or higher. |
