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Problems with lithographic plate anodizing




1999

Our company has a lithographic plate production line and the process is as follow:

The problems are

Any advice or consultant will be very welcomed.

wailok yee
- Hong kong



I have never seen electrograining of aluminum, but agitation is important in most electrode processes. You may get a more even graining if you use high agitation, either through solution movement, air agitation, rocker agitation and the like. If your graining is an anodic process, make sure you keep the anode solution below the solubility of the reaction products over the entire surface. -tom

tom pullizzi monitor   tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania
1999



To Wailok Yee

It may be a little late but not to worry I'll bet you still have these problems or if not others. We specialise in troubleshooting especially on coil lines, but know and understand the sheet method. The process as you list it seems a little short of parts. Do you degrease/pre-etch and do you have a post anodising treatment? To help we would need to know more about the condition in your process e.g., current densities, types of acids and approx. concentrations. You may be walking a tightrope on specifications.

Ray Scott
- Leeds, UK
2000


Can litho plates be re-grained and resensitised and used a second time? How is it done?

Jagan Ridrich
- Mauritius
2001




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