| 摘要 |
PURPOSE:To provide a bi-oriented film without gauge mottles, unevenness of scuff marks caused by adhesion by utilizing a roll of roughened surface finishing specifying roll Rmax value, the number of concave and the height of convex. CONSTITUTION:The process of precision finishing such as ultra finishing with small margin for finishing after abrading the roll surface with a comparatively rough whetstone, the process of precision finishing after blasting, or the combination of both of the said processes are carried out by utilizing a roll having more than 10 pcs./mm of convex, Rmax more than 1.0mum and less than 6.0mum and the height of convex not higher than 1.5mum than the centerline of section area. By utilizing the said roll, neither adhesion phenomenon of the roll and sheet or the roll and film, nor scuff marks are created, when the roll is heated up more than glass transition temperature.
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