Anodization process of long-length aluminum plate, anodization apparatus and aluminum support for planographic printing plate material

Abstract

An object of the present invention is to provide a process of anodizing a long-length aluminum plate, which reduces loss of electricity. Also disclosed is an anodization process of the above plate, employing an anodization apparatus possessing an electrolyte tank, an anode, a cathode and an electric insulator with an opening forming a current flow section, the process possessing the steps of providing the plate between the cathode and the electric insulator; and anodizing the plate by supplying current between the anode and the long-length aluminum plate, wherein the opening is located at a position of at most 10% in width length from an outer side of the plate with respect to the width length of the plate, a part of the plate is brought into contact with a part of the electric insulator, and the plate and the electric insulator travel in uniform speed.

1 . A process of anodizing a long-length aluminum plate, employing an anodization apparatus comprising 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 comprising the steps of: 
 (a) providing the long-length aluminum plate between the cathode and the electric insulator in the electrolytic solution; and    (b) 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.    
   
   
       2 . The process of  claim 1 , 
 wherein the process comprises further a step of rotating the electric insulator via a plurality of rollers.    
   
   
       3 . The process of  claim 1 , 
 wherein the long-length aluminum plate is a support for a planographic printing plate material.    
   
   
       4 . The process of  claim 1 , 
 wherein a traveling speed of the long-length aluminum plate is 5-100 m/min.    
   
   
       5 . The process of  claim 1 , 
 wherein an amount of the anodization layer is 1.5-4 g/m 2 .    
   
   
       6 . The process of  claim 1 , wherein a distance between the long-length aluminum plate and the anode is 40-60 mm.  
   
   
       7 . The process of  claim 1 , 
 wherein a thickness of the long-length aluminum plate is 0.15-0.50 mm.    
   
   
       8 . An anodization apparatus comprising an electrolyte tank charged with an electrolytic solution, and provided in the electrolytic solution, an anode, a cathode, an electric insulator with an opening that forms a current flow section, the electric insulator being provided between the anode and the cathode, and a long-length aluminum plate being provided between the cathode and the electric insulator, that is anodized 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.