Ink Smearing/Bleeding

Problem:

First down ink is not fully dry.

Solution:

Increase drying speed of ink by:

1. Reducing ink viscosity
2. Reducing ink thickness by changing metering conditions
3. Adding faster drying solvent
4. Adjusting air balance and heat

______________________________________________________________________

Problem:

Second down ink, top lacquer or adhesive is too rich, causing first down ink to dissolve.

Solution:

Check second down material and reformulate for non-aggressive properties. Consult your Sun Chemical representative for a more resistant first down ink.

______________________________________________________________________

Problem:

Foreign object is dragging on wet print.

Solution:

Trace web and remove dragging object.

______________________________________________________________________

Problem:

Not wiping well; doctor blade issues.

Solution:

Reset doctor blades to correct contact angles. Replace blades. Check chamber balance – side to side – in and out.