25% Dot Gain on Press Sheet

[jsnkiefer]

Hello all,
I've output the magenta plate and the 40% patch reads 38.7% (close enough).
The same patch on the press sheet reads 65%. I know a 100# gloss sheet
should not have 25% press gain, but the pressman insist they're running the correct density and it IS NOT THEM (big suprise, right?).

Any ideas on what is going on is GREATLY appreciated.

You out there Gordo?

[Lukas Engqvist]

25% on gloss? What process are you talking about? and what screening? I think it should be more like 13% @40%

[jsnkiefer]

he is running 4/C process on a Heidelberg SM 74 @ 150 line screen.
Thanks, Lukas.

[Ti7]

Only the magenta unit is gaining? Are the other colors within tolerance?

[Bob Peterson]

Take a look at the dots on the color bar. Is there any doubling or slurring? This will cause excessive dot gain.

[jsnkiefer]

Only the magenta unit is gaining? Are the other colors within tolerance?

Sorry Ti7, ALL colors are gaining C+17, M+25, Y+25, K+15.

[jsnkiefer]

Take a look at the dots on the color bar. Is there any doubling or slurring? This will cause excessive dot gain.

Not that I can notice, they look pretty clean.

[Ti7]

Are the blankets loose? Are they over packed? Is the stock distorted (wavy) or not square on the gripper edge? try increasing the gripper bite by maxing out the head stops to the most foward position to gain more grip.

[Lukas Engqvist]

Do you have slurr marks on yourtest stripp? (Concentric circles and/or parallell lines horisontally and vertically)

[Bob Peterson]

Has the pressman added tack reducer to the ink? If so, he may have over done it.