Verify whether the pilling is defective paper coating or ink
If defective paper coating, try a different batch of paper or lower the tack of the ink slightly if necessary
If the Ink becomes over-emulsified/waterlogged, this changes the physical properties of the ink and results in poor transfer
Check that pH, conductivity, Brix level and tempera-ture are to specification and try to run less water
Ink roller train or ink fountain is too cool
Adjust form rollers to 72°-80°F (22°-26°C) and be sure ink fountain is 70°F (21°C) or above to ensure proper ink flow and transfer
Inadequate or excessive blanket cylinder pressure and/or plate or blanket packing
Check blanket cylinder pressures and/or plate and blanket packing are all to manufacturer’s specifica-tions
Rollers are the wrong durometer or improperly set
Check roller settings, clean and condition / deglaze rollers
Ink film thickness may be too high or too low
Verify densities are in normal range
Ink is poorly ground
Check grind. Consult your ink supplier