film manner and film device null from the sheet metal surface in after

摘要

PURPOSE: To prevent local browning of a metallic thin sheet at the time of releasing a resist film from the thin sheet after etching by positively polarizing the thin sheet in potential in a release soln. under specified conditions. ;CONSTITUTION: A continuous long-sized metallic thin sheet 10 (aperture grill sheet, etc.) coated with a resist film of desired pattern is introduced into a release soln. 18 in a film releasing tank 20, a voltage is impressed between the sheet 10 and a counter electrode 24 from an external DC power source 28, and the resist film is released. At this time, the potential between the sheet 10 and a reference electrode 22 is measured at any time by a potentiometer 26, and the sheet 10 is positively polarized with the boundary potential between the alkaline corrosion region and passive region toward the passive region. Consequently, a passive film is formed on the sheet 10 surface to protect the surface, and local browning of the sheet is prevented.;COPYRIGHT: (C)1994,JPO&Japio