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  Anodization process of long-length aluminum plate, anodization apparatus and aluminum support for planographic printing plate materialRelated Patent Categories: Electrolysis: Processes, Compositions Used Therein, And Methods Of Preparing The Compositions, Electrolytic Coating (process, Composition And Method Of Preparing Composition), Forming Nonmetal Coating, Predominantly Aluminum Substrate, AnodizingThe Patent Description & Claims data below is from USPTO Patent Application 20070051637. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims priority from Japanese Patent Application No. 2005-259086 filed on Sep. 7, 2005, which is incorporated hereinto by reference. TECHNICAL FIELD [0002] The present invention relates to an anodization process of forming anodzation layer on the surface of a long-length aluminum plate, an anodization apparatus used in the anodization process, and an aluminum support for a planographic printing plate material manufactured according to an anodization process. BACKGROUND [0003] It is well known that an aluminum plate is used as a support for a planographic printing plate material. [0004] As the support for a planographic printing plate material is widely used an aluminum plate subjected to surface roughening treatment and anodization treatment, which provides good printing properties such as high water retention property or high printing durability. [0005] As the anodization treatment above, there is a method in which a long length metal plate is electrolytically treated by allowing the metal plate to travel in an electrolytic solution in which an electrode is provided and supplying current between the running metal plate and the electrode facing one side of the metal plate surface, wherein an electric insulator plate is provided on the side of the metal plate opposite the electrode in the region where the electrolytic treatment is carried out (refer to Patent Document 1, for example), or a method in which an anodization layer is formed on a long-length aluminum plate in an electrolytic solution of an electrolyte tank comprising a first electrode, a second electrode and a mobile electric insulator provided between the electrodes, wherein when the aluminum plate travels between the first electrode and the electric insulator, which prevents current from flowing between the aluminum plate and the electric insulator, an anodization layer is formed only on the surface of the aluminum plate facing the first electrode, and when the aluminum plate travels between the first electrode and the electric insulator and the insulator is moved so that current flows between the aluminum plate and the second electrode, an anodization layer is formed on both surfaces of the aluminum plate (refer to Patent Document 2, for example). [0006] Further, there is a method in which a long length sheet is provided between an anode and a cathode to form an anodization layer on the surface. For example, a method is known which employs a coil alumite one side processing apparatus employing direct current electrolysis, the apparatus comprising an electrolyte tank containing an electrolytic solution, an electricity supply electrode providing a (+) electricity and an electrolytic electrode provided with a (-) electricity each being opposed to each other in the electrolytic solution, two slit plates, a slit between the slit plates, a long-length sheet to be processed traveling between the both electrodes and then through the slit, and a U-shaped mask separator provided to cover the both edges in the transverse direction of the sheet, wherein the distance between the end on the sheet surface side of the slit plate and the sheet surface is not more than several millimeters, the distance between the wall of the U-shaped separator and the sheet surface is about 1 mm, and the distance between the wall of the U-shaped separator and the sheet end is not more than several millimeters, and wherein current for electrolysis flows in the thickness direction of the long length sheet (refer to Patent Document 3, for example). [0007] However, these methods result in much loss of electricity, and effective anodization of an aluminum plate has been desired. (Patent Document 1) Japanese Patent O.P.I. Publication No. 57-47894. (Patent Document 2) Japanese Patent Examined Publication No. 63-58233. (Patent Document 3) Japanese Patent Examined Publication No. 58-24517. SUMMARY [0008] It is an object of the present invention to provide a process of anodizing a long-length aluminum plate, which reduces loss of electricity, to provide an anodization apparatus used in the anodization process, and to provide a support for a printing plate material manufactured according to the anodization process. BRIEF DESCRIPTION OF THE DRAWINGS [0009] Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements numbered alike in several figures, in which: [0010] FIG. 1(a) shows a side view of one embodiment in the anodization process of the present invention, [0011] FIG. 1(b) shows a cross-sectional view of an electrolyte tank in the anodization process, [0012] FIG. 2(a) shows the shape of the opening in the electric insulator, [0013] FIG. 2(b) shows a cross-sectional view of the electric insulator in FIG. 2(a), and [0014] FIG. 3 shows a side view of one example of conventional anodization apparatuses comprising an electricity supply tank. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0015] The above object of the present invention is accomplished by the following structures. [0016] (Structure 1) A process of anodizing a long-length aluminum plate, employing an anodization apparatus possessing an electrolyte tank charged with an electrolytic solution, and provided in the electrolytic solution, an anode, a cathode and an electric insulator with an opening that forms a current flow section, the electric insulator being provided between the anode and the cathode, the process possessing the steps of providing the long-length aluminum plate between the cathode and the electric insulator in the electrolytic solution and anodizing the long-length aluminum plate by supplying current between the anode and the long-length aluminum plate through the current flow section, whereby an anodization layer is formed on the aluminum plate surface on the side facing the cathode, wherein the opening is located at a position of at most 10% in width length from an outer side of the long-length aluminum plate with respect to the width length of the long-length aluminum plate, a part of the long-length aluminum plate is brought into contact with a part of the electric insulator, and the long-length aluminum plate and the electric insulator travel in uniform speed. 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