Chill Roll Condensation

Problem:

Streaks appear on web or signatures. This is caused by ink re-softening due to solvent condensation on chill rolls.

Solution:

Check dryer and/or chill roll temperature. Use inks with lower boiling point solvents if possible. Consult suppliers of dryer, chill rolls and inks, as necessary.

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Problem:

Dryer temperature is too high, inhibiting the ability of chill rolls to cool web efficiently.

Solution:

Decrease web exit temperature.

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Problem:

Marking appears on chills or delivery equipment.

Solution:

Check web temperature from dryer and chill rolls. Check cooling efficiency of chill roll system.