POLYMER FILM, FILM ROLL AND KNURLING APPLYING ROLLER

摘要

PURPOSE: A polymer film, a film roll and a knurling applying roller are provided to prevent the twisting and loosing of the winding and the extension of an ear portion by forming the knurling in a knurling applying area. CONSTITUTION: A polymer film includes a knurling applying area in which a plurality of knurling is arranged and a ridge formed at the end of the knurling. The plurality of knurling protrudes from the film surface. The knurling applying area is included in both ends of a polymer film(11) in a width direction. The total of the ridge length forms a band shape of 0.95mm or more and 3mm or less per 1mm2 of knurling applying area.