stretched composite polyester films, method for the production thereof and use of such sheets within the printing area

摘要

A thick composite polyester film of between 40 and 300 microns in thickness being crystalline or semicrystalline comprising drawn unfilled layer (A) of thickness e, covered on at least one surface thereof with a thin drawn filled layer (B) of thickness e2, having an overall roughness greater than 0.3 microns and being filled with inert particles wherein the volume median diameter of the filler being at least equal to the thickness of layer (B); the thickness ratio of layers (A) and (B) denoted by e1/e2 is lower than 5% and the percentage of scattered light transmitted from the composite film is lower than 7.