horizontal gear lines

[Alois Senefelder]

Hello Pilot Print,


The Cylinder pressures need Setting Correctly - NOT Light - BUT FIRM

Regards, Alois

[maas]

have you check your clearances, cylinder to blanket, undercut?, no rollers out of round?

regards
Maas

[PilotPrinting]

Seems like replacing the 2 form rollers did the trick, after trying just about everything else!
Thanks so much for all the GREAT suggestions, learned a lot!

[PilotPrinting]

the new ink form rollers helped, but the problem still persisted. replaced my Compac form roller too, that helped some more but still didn't cut the mustard. Switch back to plain blanket wash from a substitute that I had been using and that seems to help significantly. Just printed 11,000 impressions, 3 jobs and the work came out clean. If the good results continues for a bit, I'll try switching back to my blanket wash substitute and see what happens. I used to use EcoloClean CD, but had to change to an alternative when VARN discontinued producing it. I seem to have had increased problems since then but can't blame anything, yet. Thanks again for all the great suggestions!!!!!!

[RGPW17100]

The press wash you switched to a water misable? If so are you cutting it or running it full strength. That stuff full strength will really mess up rubber. I used to love the Ecolo clean. It was the only water misable that would not separate. Maybe try Varn V120 and mix 50/50 with water

[PilotPrinting]

RGP, thanks for the additional info on the blanket wash substitute. Yes I was using EcoloClean CD too, was great stuff!!! I was very bummed when they stopped making it a year or two ago, seems my troubles started shortly after. I was using the substitue straight, seemed to work pretty good that way. Kinda sucked mixing it with water, didn't seem to do a very good job. Will check on the exact brand I was using and post it here. I've gotten about 20,000 impressions now after switching back to straight blanket wash. I really think this was the culprit. Had some other issues too that didn't help, but am 70% sure it was the blanket wash substitute which I was using straight.
Best wishes, you guys are awesome!!!!
Gordon

[pressmanken]

I would suspect the plate/blanket cylinder pressure is too tight. The gears could be gummed up with paper dust/crud on an old press with a lot of impressions under it's belt. Packing your blanket may have helped by pulling the cylinders apart enough to keep the gears from bottoming out against each other. As for the water-miscible wash, it works pretty good, as long as you keep it mixed well. I have to shake mine up all the time to keep it from separating. Hope it helps. Good luck. By the way, I have an old 1250 with a T-head, if anyone's interested.