Color is not stable during the production. This usually happens when line speeds change, and/or in start and stop situations.
Insufficient or excessive cooling.
Keep the temperature of the roller chain stable, in between 30 – 45ºC. Ensure the chiller is not clogged.
Screen work dot gain.
Keep the ink film weight as low as possible to stop the plates from becoming flooded.
Side to side color variation.
Check roller settings in order to identify the root cause of the print differential.