Abstract: An oxidation electrode is formed with a front-surface-side electrode member and a back-surface-side electrode member, and two switches are provided respectively between a power supply and the front-surface-side electrode member and between the power supply and the back-surface-side electrode member. Since the front-surface-side electrode member and the back-surface-side electrode member are separate, an aluminum plate and other structures provided in a anodizing bath do not hinder a replacement of the electrode members, so that the replacement can be carried out easily and at low costs. Since the front-surface-side electrode member and the back-surface-side electrode member can be independently turned on and off for a single side treatment, the energy efficiency can be improved and switching between the single side treatment and the double treatment can be facilitated.

Abstract: A process for drying a coated web which comprises drying a continuously traveling web coated with a coating composition containing an organic solvent by hot air up to set to touch, and evaporating the residual solvent in the coated membrane by heating a heating roll. In the process of the invention, since a coated web is first dried by a hot air at a relatively low temperature, such as lower than 150.degree. C., up to set to touch state and then further dried by a heating roll being excellent in heat conductivity, a temperature distribution occurs little in the cross direction. Moreover, the present drying process rarely affects adversely the coated membrane of the web.