Poor Ink Coverage

Problem:

Plate impression is insufficient.

Solution:

Increase plate to substrate impression.

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Problem:

Ink film is too thin for substrate characteristics i.e. too rough or porous.

Solution:

Increase ink film thickness by:

1. Raising ink viscosity.
2. Decreasing metering of anilox roll; increasing anilox roll volume or reformulating ink for substrate.

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Problem:

Printing plate is too hard.

Solution:

Use plates with a softer durometer.

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Problem:

Substrate surface resists ink wetting and lay.

Solution:

Consult with a local Sun Chemical representative for additives.

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Problem:

Ink is drying too fast.

Solution:

Slow drying with glycol or increase machine speed.