| abstract |
A method of manufacturing a resin film, including the steps of, a) slitting a resin base at both edge portions, the resin base comprising cellulose acetate or a norbornene type resin so as to form a resin base to a predetermined product width; and b) providing a knurling process on both edges of the slitted resin base, resulting in a final film thickness of 30 to 125 μm, a film thickness deviation in at random points across the width of 0.1 to 1.8 μm, and a creak value of 0.4 to 1.4, wherein a mean value of knurling knob height measured at 10 random points is 5 to 15 μm, a minimum value of measured knurling knob height is more than 1 μm, a maximum value of measured knurling knob height is less than 20 μm, and a deviation of the measured knurling knob height is 1 to 10 μm. |