Polyester film roll

摘要

A polyester film roll free from wrinkles over a long period of storage consists of a polyester film having a thickness of 25 microns or less and a centerline average surface roughness of from 0.001 to 0.05 microns and is characterized in that the roll hardness (H) and the centerline average surface roughness (Ra) of the film roll satisfy the relationship (I): H>/=0.67x3-10.61x2+55.54x-1.16 (I) wherein x=ln (1/Ra), which film roll can be produced by means of a surface-center-winding method or a surface-winding method wherein the surface of the film roll is pressed with a touch roll.