Process for electrochemically roughening a surface of a metal we

Details Process for electrochemically roughening a surface of a metal we Process for electrochemically roughening a surface of a metal we

1996-07-30

1997-09-16

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic erosion of a workpiece for shape or surface...

205658, 205659, 205651, C25F 302

Patent

active

056676662

ABSTRACT:
A process for roughening a surface of a support for a lithographic printing plate in which an electric current is supplied between a metal web and an electrode facing the metal web in an electrolyte containing metal ions so that the metal web is subjected to electrochemical processing continuously, 1-20 pause sections are provided in the electrochemical processing and the time taken for passage through once processing pause section in the electrochemical processing is set to 1-30 seconds. With the process, the grain shape can be controlled with no troublesome condition setting to improve a scumming resistance without deteriorating a printing durability and a fill-in reduction so that the plate has superior performance.

REFERENCES:
patent: 4315806 (1982-02-01), Arora
patent: 4377447 (1983-03-01), Bednarz
patent: 4533444 (1985-08-01), Oda et al.
patent: 4536264 (1985-08-01), Masuda et al.
patent: 4919774 (1990-04-01), Minato et al.
patent: 5358610 (1994-10-01), Kawasumi et al.

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