| 摘要 |
PURPOSE:To enhance the wear resistance and running stability, by forming a ferromagnetic thin film on a plastic film having a surface provided with granular, wrinkly or vermicular protrusions. CONSTITUTION:A ferromagnetic thin film 5, 5' is formed on the surfaces of granular, wrinkly or vermicular protrusions 4, 4' having surface projections 3, 3' due to residue of polymn. catalyst or added fine particles 2, 2'. The height of the projections 3, 3' is <=2,000Angstrom and the average density of projections having 300- 2,000Angstrom height is 10-10,000 per 1mm.<2> surface area. |
