Blankets are not releasing ink well
Check blanket compatibility with ink system. Change to a new blanket if required.
Heavy ink films/densities in prior units are increasing the opportunity for poor trapping
Lower densities of prior colors and increase density of latter units or change rotation. Lower the tack of the ink if necessary with 2-5% gelled reducer
Paper may have high hold out (low absorption)
This prevents the inks from setting into the paper and tacking up between units leading to poor trapping and tacking up between units leading to poor trapping
For more information, please contact us.