Patent ID: 6162529
Filing Date: 2000-12-19
Classification: B29C,B29D,B29K,B65H,Y10T

Abstract:
A film roll of a thermoplastic resin film wherein(1) the distance between at least one of the two film ends extending in a film winding direction of the film roll and the center line of the film roll changes in the film winding direction of the film roll;(2) the center line average surface roughness Ra.sup.E of each of the two edge faces of the film roll is in the range of 3 to 200 .mu.m;(3) the maximum depth of the concave portion of the edge faces of the film roll is in the range of 50 to 5,000 .mu.m; and(4) the distance between the apices of two adjacent convex portions in a diametric direction of the edge face is in the range of 200 to 1,000 .mu.m.