| 摘要 |
PURPOSE:To obtain a uniformly charged substrate by corona discharge, and to form a hydrophilic layer such as photographic emulsion, etc. having high uniformity to the surface of the substrate, by using an earth roll manufactured by coating the surface of a metallic roll with an insulating coating layer consisting of a substance having high dielectric constant. CONSTITUTION:A substrate 5 having hydrophobic surface is passed over the earth roll 1 or a roll electrode composed of a metallic roll 2 coated with an insulating coating layer 3 consisting of a substance having high dielectric constant (preferably barium titanate ceramic), and is subjected to the corona discharge treatment using the corona discharge electrode 4. Usually, the treated substrate is coated with a hydrophilic coating layer. |
