Troubleshooting Guide - Pressroom Conventional
On Press Issue: Drying
Potential Causes
Ink taking on too much water
Solution: Adjust ink/water balance.
Ink film thickness is excessive
Solution: Run less ink. Check formula for proper ink strength. Increase strength of ink if appropriate.
Plate dampening uneven
Solution: Keep dampeners clean and free from accumulated dirt. Prevent drafts, check windows, vents, and forced air systems. Check metering roller skew.
pH or conductivity incorrect
Solution: Adjust fountain solution pH and conductivity if necessary
Ink isn't formulated for the substrate
Solution: Review formula. Make sure the proper drier has been added.
Insufficient air/oxygen circulation between sheets
Solution: Wind sheets between printing and other operations. Use anti-set-off spray to keep sheets apart. Impervious sheets such as plastics and foil should be kept in small lifts, slip sheeted, or winded frequently.
Relative humidity too high
Solution: Control pressroom humidity if possible.
