Re: mottle problem
Hi matthew,
My guess is paper, if you changed the sequence and it stayed the same then i would not blame the inks but check ink viscosity and if possible raise chiller temp rollers two degrees to aid ink flow and lay down. If no luck check plate to blanket preassure with ink strip or packing guage. Then next thing to check is blankets, what is there surface type are they cast or ground and what is there shaw hardness. The harder the blanket the more probable a mottle will be smoothed out. Fount could play a important role to as too much water on the first unit could cause the paper on the second and third to not lay down ink as well, check conductivity and mix controlled mix in a one litre jug and compare I have had issues when i run to much IPA i get mottle. Last to check is taking the units after the CM off impression to rule out any back trap mottle on later units. If problems still persist try different a gloss sheet to see how that looks.
Paul.
Edited by: Paul Green on Feb 8, 2008 6:27 AM