Method for producing lithographic printing plate original plate and method for roughening surface of aluminum support body

Abstract

A method for producing a lithographic printing plate original plate, the method comprising an electrolytic surface-roughening treatment step to perform an electrolytic surface-roughening treatment of an aluminum support body, wherein, in the electrolytic surface-roughening treatment step, an electrolysis treatment is performed in an acidic solution having a dissolved oxygen concentration of 6.0 mg/l or less.

1 . A method for producing a lithographic printing plate original plate, the method comprising an electrolytic surface-roughening treatment step to perform an electrolytic surface-roughening treatment of an aluminum support body,
 wherein, in the electrolytic surface-roughening treatment step, an electrolysis treatment is performed in an acidic solution having a dissolved oxygen concentration of 6.0 mg/l or less.   
     
     
         2 . The method for producing the lithographic printing plate original plate according to  claim 1 , wherein the electrolysis treatment is alternating current electrolysis treatment, or direct current electrolysis treatment by an anode reaction. 
     
     
         3 . The method for producing the lithographic printing plate original plate according to  claim 1 , wherein a dissolved oxygen concentration is adjusted to be 6.0 mg/l or less by removing oxygen contained in the acidic solution by any of methods of film degassing, a nitrogen purge, and a pressure reduction. 
     
     
         4 . The method for producing the lithographic printing plate original plate according to  claim 2 , wherein a dissolved oxygen concentration is adjusted to be 6.0 mg/l or less by removing oxygen contained in the acidic solution by any of methods of film degassing, a nitrogen purge, and a pressure reduction. 
     
     
         5 . A method for roughening a surface of an aluminum support body, comprising a step of providing an electrolysis treatment to the aluminum support body in an acidic solution having a dissolved oxygen concentration of 6.0 mg/l or less. 
     
     
         6 . The method for roughening the surface of the aluminum support body according to  claim 5 , wherein the electrolysis treatment is alternating current electrolysis treatment, or direct current electrolysis treatment by an anode reaction. 
     
     
         7 . The method for roughening the surface of the aluminum support body according to  claim 5 , wherein the dissolved oxygen concentration is adjusted to be 6.0 mg/l or less by removing oxygen contained in the acidic solution by any of methods of film degassing, a nitrogen purge, and a pressure reduction. 
     
     
         8 . The method for roughening the surface of the aluminum support body according to  claim 6 , wherein a dissolved oxygen concentration is adjusted to be 6.0 mg/l or less by removing oxygen contained in the acidic solution by any of methods of film degassing, a nitrogen purge, and a pressure reduction. 
     
     
         9 . The method for roughening the surface of the aluminum support body according to  claim 5 , wherein the aluminum support body is a support for lithographic printing plates. 
     
     
         10 . The method for roughening the surface of the aluminum support body according to  claim 6 , wherein the aluminum support body is a support for lithographic printing plates. 
     
     
         11 . The method for roughening the surface of the aluminum support body according to  claim 7 , wherein the aluminum support body is a support for lithographic printing plates. 
     
     
         12 . The method for roughening the surface of the aluminum support body according to  claim 8 , wherein the aluminum support body is a support for lithographic printing plates.