Ink - Water curve not adjusted properly
Consider rechecking & adjust the curve with current ink with minimum water
Ink flow in the duct is uneven.
Agitate ink & check the evenness of ink film in the duct roller.
Ink Roller glazed & variances in ink transfer
Deglazed the rollers with good deglazer and try again
Ink roller is not set as per OEM
Check the ink rollers and set them as per OEM
Print with over emulsified ink
Clean the rollers & remove the old ink from duct and add fresh ink. Print start with minimum water value.
Water hardness is more than desired level
Check the pH , Conductivity & TDS of process water & adjust as per standard (PH- 6.5 to 7.5.Conductivity -280 to 450 & TDS- 140ppm to 220ppm) to maintain 8 Deg to 12 Deg German Hardness.
For more information, please contact us.