Dried ink particles
Avoid ink skin when handling ink; cover exposed ink; clean press well and often; remove dried ink from fountain edges and roller ends.
Excessive dampening solution may lift coating
Adjust ink/water balance to reduce the dampning effect
Foreign particles are adhering to the plate or blanket
1. Check for contamination in ink and/or fountain solution and rollers for deterioration
2. Use scotch tape to remove hickey for examination. If pigment or ink skin, remove old ink from fountain and replenish with ink from a freshly opened can
3. If paper fibers, try a different run of paper or if necessary, gradually reduce the tack of ink
Foreign particles are adhering to the plate or blanket
Check for the contamination in ink and / or fountain solution or paper
Loose paper coatings or dust
Consult paper manufacturer to install vacuum sheet cleaner or to change stock.
For more information, please contact us.
