Flexographic

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Dirty Print-Feathering

Problem:

Impression between plate and substrate is excessive.

Solution:

Reset plate pressure to “kiss” impression.


Problem:

Water-based ink pH is too low.

Solution:

Reduce anilox volume.


Problem:

Ink is drying too fast.

Solution:

Check ink formulation; add slower drying solvents.


Problem:

Air hitting plates or anilox roll is excessive.

Solution:

Block stray air; balance dryers to eliminate “blown-down” on plates.


Problem:

Ink viscosity is too high.

Solution:

Reduce ink viscosity.


Problem:

Dust or lint is picked up from substrate.

Solution:

Check to be sure ink filters are working; filter ink.


Problem:

Ink formula out-of-balance; affects film splitting/transfer.

Solution:

Check solvent blends for alcohol/ester balance. For clean printing, the resin structures must have the correct solvents.


Problem:

Ink viscosities are uncontrolled. Wrong viscosity cups (out-of-range) for viscosities run. Cups need cleaning and calibrating.

Solution:

Record and control press-side viscosities. Check cups for accuracy and selection.

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

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

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