Piling

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