C
cjwworld
Guest
Thats great news.. at least maybe someone else might have the same issue and your solution might help
problem solved
10% gain difference was caused by a plate developing unit.
we changed the developer circulator pump, as it stalled from time to time.
It seems that I missed those plates where the difference was biggest.
We had to get digital microscope for accurate reading, handheld Gretag was off by (+ -) 4%
And cyan dot gain issue was completely ink`s fault.
This 5% extra gain magically disappeared when I added ink manually from new container.
Hi to all,
been looking for web offset related forum for a long time
I have some strange problems on my press.
On our press it looks like the dot gain has a mind of its own, one day the gain on 50% area is 15%, next day the gain on the same area and the same paper is 25%. (similar job)
Ink roller temp.(77F) and dampening temp.(52F) don't deviate very much.
Dots on the plates are always the same.
What are the most important things to look for when controlling dot gain?
Running Goss M600 4 unit press with Sun Chemical universal inks.
Thanks in advance.
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