Paper Packaging

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Mottled Print

Problem:

Surface finish or caliper of substrate is inconsistent.

Solution:

Increase plate to substrate impression or switch to softer plates.

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Problem:

Plate impression is incorrect.

Solution:

Adjust plate to substrate impression.

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Problem:

Substrate surface finish or textured pattern appears on surface.

Solution:

Replace stock. Check with a Sun Chemical representative for additives.

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Problem:

Ink viscosity is too low.

Solution:

Raise viscosity by adding fresh ink.

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Problem:

Too much water has been added to the ink, causing it to be out of balance.

Solution:

Add fresh ink or replace ink in press pump.

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Problem:

Anilox roller, wiper roll, or printing plate is dirty or damaged.

Solution:

Clean or replace rolls or plate.

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Problem:

Ink in press is contaminated.

Solution:

Clean press station and replace ink.

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Problem:

Ink formulation is incorrect.

Solution:

Check with a Sun Chemical representative.

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Problem:

Ink is foaming.

Solution:

Add defoamer. Investigate and eliminate the cause of foam.

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Problem:

Ink pH is too low.

Solution:

Check and adjust pH (non-pH stable inks only).

*The solutions provided from the troubleshooting guide are general in nature, please contact or your sales or technical representative to discuss specific issues.

Information about Sun Chemical

Sun Chemical offers a broad ink and coating product portfolio with a wide range of capabilities that include inks, coatings, color software and brand color management for paper packaging.

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