Flexographic

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Problem:

Print impression is excessive.

Solution:

Reset plate pressure to “kiss” impression.

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Problem:

Water-based ink pH is too low.

Solution:

Increase water-based ink pH.

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Problem:

Ink is drying too fast.

Solution:

Add slower drying solvents to reduce tack. Tacky inks will usually show stringing from type edges.

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Problem:

Plates are worn, uneven, cupped or poorly made.

Solution:

Check plates and replace if necessary.

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Problem:

Ink viscosity is too high.

Solution:

Reduce ink viscosity.

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Problem:

Plate relief height is incorrect.

Solution:

Adjust plate relief to correct height range.

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Problem:

Foreign matter appears in ink.

Solution:

Filter or replace ink; eliminate source of contamination.

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Problem:

Ink out of balance – pigment to resin, resin to solvent.

Solution:

Add resin and refresh ink; make sure the correct solvent is being used. Make sure ink is well mixed.

Information about Sun Chemical

Sun Chemical offers a broad portfolio of inks, coatings, color software and brand color management for flexographic printing.

Learn About Sun Chemical's Solutions for Flexographic Printing