Plates become sensitive during the run, and will start to transfer ink in the non-image area.
|Improper fountain solution mix
|Check fountain solution mix for proper conductivity and pH, adjust according to manufacturer’s specifications.
|Water and/or ink settings are too high emulsifying the ink
|Reduce ink and waters settings
|Contaminated press mix
|Rebatch fountain solution chemistry.
|Temperatures of fountain solution and ink vibrators are too high.
|Check temperature of fountain solution and ink vibrators, adjust to recommended specifications.
|Ink not formulated properly.
|Consult ink manufacturer.
|Plate non-image area becomes contaminated.
|Stop press and clean plate with a recommended plate cleaner. Can use a cleaner designed to be used while running for web applications.
|Paper stock fillers such as calcium carbonate cause non-image area to become sensitive.
|Consult paper supplier, consult chemistry supplier for a fountain solution that has additives to combat this. Utilize a cleaner for calcium.
|Press roller settings are incorrect.
|Check roller stripes to make sure settings are correct. Adjust to manufacturers specifications.