| 摘要 |
PURPOSE:To provide a polyester film roll capable of preventing longitudinal wrinkles generated heretofore under a high temp. and high humidity condition. CONSTITUTION:In a film roll formed by rolling a biaxially oriented film wherein a layer of polyester A containing particles is laminated to the single surface of the layer of polyester B so that the layer of polyester A becomes outside, the ratio t/d of the thickness (t) of the layer A and the mean particle size (d) of the particles contained in the layer A is 0.1-2.5 and the ratio SRmax/SRa of the three-dimensional surface roughness SRa and SRmax of the layer A is 20 or more. |
