Work Piling

Problem:

Ink becomes waterlogged. This causes the pigment to separate due to insufficient viscosity and tack.

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Solution:

Run less fountain solution on press. Have ink checked for emulsification characteristics.

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Problem:

Rollers are wrong durometer; rollers are improperly set; blanket is underpacked or badly conditioned.

Solution:

Use proper rollers and blankets; check roller settings and blanket packing, or clean and condition.

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Problem:

Ink has improper dispersion or grind.

Solution:

Check ink dispersion. Check ink viscosity. Consult your Sun Chemical representative.

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Problem:

Ink is unstable.

Solution:

Consult your Sun Chemical representative.

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Problem:

Fountain solution pH and/or conductivity is incorrect.

Solution:

Check and adjust to supplier recommendations.

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Problem:

Ink roller train surface temperatures are incorrect.

Solution:

Adjust roller surface temperatures to recommended values. Check roller settings.

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Problem:

Ink lacks sufficient lubrication or is unstable.

Solution:

Consult your Sun Chemical representative.

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Problem:

Dry ink that has not fully transferred from the blanket to the paper can begin to build up, producing a relief image. This is caused by inadequate blanket cylinder pressure and/or plate or blanket packing.

Solution:

Check blanket cylinder pressure and/or plate and blanket packing.