Donuts

Problem:

Ink is drying too fast.

Solution:

Add small amounts of slower drying solvents.

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Problem:

Ink viscosity is too high.

Solution:

Reduce ink viscosity and adjust for better flow out.

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Problem:

Foaming is occurring in the ink.

Solution:

Minimize ink free fall and avoid over-agitation.

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Problem:

Solvent balance is poor.

Solution:

Consult your local Sun Chemical representative.

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Problem:

Film treatment is marginal.

Solution:

Check film for proper treatment.

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Problem:

Porosity in substrate is too high.

Solution:

Use lower porosity substrate or try adding wetting agent to the ink.

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Problem:

Cell volume is excessive for high hold out substrates.

Solution:

Reduce cell volume on high hold out substrates.

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Problem:

Cell geometry is inappropriate.

Solution:

Adjust cell geometry.

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Problem:

Ink may be too tacky.

Solution:

Make the ink harder using an alternate resin.