| 摘要 |
PURPOSE:To manufacture a crystalline polyolefine resin sheet or film showing excellent transparency, by a method wherein after a sheetlike thing has been stuck closely to the upper part of a cooling roll by an air knife and a noncontacting surface side of the sheetlike thing with the cooling roll has been pressed by a touch roll and the noncontacting surface side of the cooling roll is cooled with a cooling agent until a frost line is generated through cooling and solidification. CONSTITUTION:Crystalline polyolefine resin is extruded in a sheetlike state by passing the same through a T die in a molten state, the extruded sheetlike thing is stuck closely to the upper part of a cooling roll by an air knife and the said sheetlike thing with the cooling roll is pressed further by a touch roll on a noncontacting surface side. Then a noncontacting surface side of the said sheetlike thing with the cooling roll is cooled by a cooling agent until a frost line is generated on the said sheetlike thing through cooling and solidification. At this time, the touch roll to be used is an elastic roll having a mirror surface, which is a rubber roll coated with fluorine resin or silicon resin. Then as cooling by a cooling agent, it is performed by applying cooling water to the said sheetlike thing through a broad slit. |
