Heidelberg QM46-2 line in solids

I have successfully run a number of heavy solids on my QM46-2 in the past. Recently, I have gotten a light streak, running in the same direction as the grippers, 2 5/8" from the lead edge. I have reset all of the ink and dampener roller stripes, which were already in specification, and checked all ink and dampener rollers for cuts and blemishes, and there are none.

I am fairly convinced that this is dampening related, but having reset the rollers, and even "fiddled" with the settings just to see if a larger or smaller roller stripe between rollers helped, the streak has gotten larger with testing, but never gone away.

This problem does not appear on print unit #2. So it is not a blanket, packing or impression related problem.

Ideas, please?

 

Take your dampers and inkers out and give them a clean by hand using something like a Jif cream cleaner and clean the oscillators to eliminate any issues with contamination.

Regards.

 

QM banding

Hello Mr. Heidelberg,

Thank you for your response, and please excuse the delay in my reply. It took a while for me to take out and hand wash the rollers.

I did a complete re-striping, including removing the dampening assembly, in order to best get to those hard to find red and yellow adjusting screws. After all of the washing and the re-striping, the issue has lessened, but is never the less still present.

I find that slightly increasing the stripe between the pan roller and the water form roller, and going a whisker thinner on the stripe from the water form roller to the plate provided the best results. This suggests to me , that the dirometer of the rollers is getting a bit high and it may be time to replace them. This seems the only logical solution, so far as I can tell.


Thank you,

Gary