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Print Density Control

 
Problem:
Printed Sheets show color variation from sheet to
sheet during the run. Ink film densities are very unstable.
Causes:
Low ink level in the fountain
Improper roller setting
Ink Emulsification
Ink backing away from the "fountain" roller
Roller Stripping
Contaminated ink fountain – dust, grit, etc.
Solutions:
Keep ink fountain full to maintain head pressure
Reset rollers
Decrease water or add heavy body varnish
Agitate ink in the fountain or increase ink flow
Deglaze the rollers
Remove ink, clean fountain, replace with fresh ink