Donuts

Ink is drying too fast

Add small amounts of slower drying solvents

Ink viscosity is too high

Reduce ink viscosity and adjust for better flow out

Foaming is occurring in the ink

Minimize ink freefall and avoid over agitation

Solvent balance is poor

Consult your local Sun representative

Film treatment is marginal

Check film for proper treatment

Porosity in substrate is too high

Use lower porosity substrate or try adding wetting agent to the ink

Cell volume is excessive for high hold out substrates

Reduce cell volume on high hold out substrates

Cell geometry is inappropriate

Adjust cell geometry

Ink may be too tacky

Make the ink harder using an alternate resin

Solvent (blend) is too Polar, picking up moisture

Add Ester or Aromatic Aliphatic Hydrocarbon