| 摘要 |
PURPOSE:To manufacture an unoriented film at high quantity and high production speed, by a method wherein regulating plates of a sheet selvage part are provided on both side end parts of a discharge opening of an extrusion die by making the discharge opening position on a revolving direction side to a perpendicular line passing through the center of a revolving cooling drum, and inclining to the revolving direction side. CONSTITUTION:Both side end parts of a molten polyester film 14 extruded through a die 11 flow by adhering to a selvage part regulating plate 30 and come into contact with the surface of a revolving cooling drum 13 without suddenly generating shrinkage in width of the sheet in a space. A resin sheet in a molten state is stuck closely on a roll surface firmly further by a liquid film 22 applied to the surface of a revolving cooling drum by an application machine 21 and cured by cooling. The die 11 is arranged by making the same position in a revolving direction of the cooling drum to a perpendicular line passing through the centre (O) of the cooling drum 13 and making a discharge opening incline. The sheet 14 becomes extremely close to a straight line a whole width direction of the film crossing a slit of the die and come into contact with the revolving cooling drum evenly. |
