Inadequate Drying

Problem:

Ink is taking up too much water.

Solution:

Check ink/water balance. Run proper amount of ink and water.

______________________________________________________________________

Problem:

Rollers are not properly conditioned or set.

Solution:

Thoroughly condition or reset the roller system. (Improperly set or poorly conditioned rollers promote emulsification of ink.)

______________________________________________________________________

Problem:

Fountain solution pH or conductivity is wrong.

Solution:

Adjust to manufacturer’s specifications.

______________________________________________________________________

Problem:

Heatset solvent range for proper volatilization is too high.

Solution:

Consult your Sun Chemical representative.

______________________________________________________________________

Problem:

Excessive ink thickness is being run.

Solution:

Consult your Sun Chemical representative about stronger ink.

______________________________________________________________________

Problem:

Web exit temperature is too low.

Solution:

Increase web exit temperature.

______________________________________________________________________

Problem:

Dryer temperatures are too high, inhibiting the ability of chill rolls to cool web efficiently.

Solution:

Decrease web exit temperature and check chill roll efficiency.

______________________________________________________________________

Problem:

Marking is visible on chills or delivery equipment.

Solution:

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