Rollers are improperly or inadequately cleaned
Thoroughly clean-up with a good quality roller glaze remover. (To remove glaze apply hot water to roll-ers after removing ink. This will remove gum glaze that is not soluble in standard wash-up solvents)
Rollers are improperly set; rollers are swollen or distorted
Check and adjust roller settings. Check roller surface conditions
Ink is unstable
Consult your Sun Chemical representative
Gum arabic and gum substitutes are in fountain solution; wetting agents used indiscriminately
Control use of additives and use proven fountain solution
Roller surfaces have calcium build-up on them
Consult your Sun Chemical representative