Fish Eyes, Orange Peel and Over Varnish Striation

There are many holes or lines on the over varnish surface in one of three ways:

• Fish Eyes: The overprint varnish is applied with foam and the bubbles tend to burst, leaving craters.
• Orange Peel: The over varnish leveling looks like an orange peel.
• Striation: There are printed over varnish lines around the can.

Fish Eyes

Problem:

Holes on the surface can.

Solution:

Keep the overprint varnish well stirred in order to avoid the separation between solid and liquid parts.

Orange Peel

Problem:

The ink film weight is too high.

Solution:

Check the can against a standard. If the shade looks stronger than standard, reduce the ink film weight by closing the fountain.

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Problem:

Too many laps of varnish.

Solution:

Slow over varnish unit until overlap is approximately 2-3 cm.

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Problem:

Incompatibility between ink and over varnish.

Solution:

Change ink or over varnish.

Striation

Problem:

The overprint varnish is drying on the applicator roller.

Solution:

Change the applicator roller.

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Problem:

Too much pressure on the applicator roller.

Solution:

Check pressure settings.