Web conveying apparatus, and apparatus and method for electrodeposition using web conveying apparatus

A web conveying method comprising using an apparatus for conveying a web while holding the web and applying tension to the web, wherein the conveying apparatus comprises a plurality of rollers with which the web contacts to be conveyed, and the web is conveyed while deformation of the web is limited to Y/E or less by a mechanism provided for at least one roller of the rollers, where Y is yield strength of the web and E is Young's modulus of the web.

A continuous oxide-film electrodeposition apparatus for continuously electrodepositing an oxide film electrochemically on an elongated substrate with applying electric current between the elongated substrate to be immersed in a electrodeposition bath and an anode,

• wherein the elongated substrate is conveyed while tension is applied to the elongated substrate and a portion of the substrate is wound on an electrical supply roller that feeds or receives all electrodeposition current via an electrical supply means, and wherein inclinations of the electrical supply roller with respect to preceding and succeeding rollers during conveying are maintained within a predetermined angle that is determined based on a ratio of yield strength to Young's modulus of the elongated substrate.

A continuous oxide-film electrodeposition method for continuously electrodepositing an oxide film electrochemically on an elongated substrate with immersing the elongated substrate to be conveyed and an anode opposing thereto and applying electric current between the elongated substrate and the anode,

• wherein the elongated substrate is conveyed while the tension is applied to the elongated substrate and a portion of the substrate is wound on an electrical supply roller that feeds or receives all electrodeposition current via an electrical supply means, and wherein inclinations of the electrical supply roller with respect to preceding and succeeding rollers during conveying are maintained within a predetermined angle that is determined based on a ratio of yield strength to Young's modulus of the elongated substrate.