Dirty Print-Dot Bridging

Problem:

Anilox volume is too deep for dot size and an excessive amount of ink is metering to the plate.

Solution:

Reduce anilox volume or increase plate dot size.

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Problem:

Ink is flooding plate dots due to loose ink metering or worn doctor blades.

Solution:

Check and adjust ink metering; check and replace doctor blade if indicated.

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Problem:

Stray air is blowing on plate or anilox.

Solution:

Block stray air; balance dryers to eliminate.

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Problem:

Plate impression or plate relief is excessive.

Solution:

Reset plate impression. Eliminate high spots if bridging is localized.

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Problem:

Ink is drying too fast.

Solution:

Add slower drying solvents.

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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.