Energy Curable

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Curing

Problem:

Ink film too heavy.

Solution:

Run thinner ink film / strengthen ink. (Normally not a problem with EB).

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Problem:

Ink is over-emulsified.

Solution:

Run thicker ink film / weaken ink (often associated with light take-off/coverage). Check fountain solution pH and conductivity or reduce dampener feed. Consult your Sun Chemical representative (Reference Ink Emulsification topic later in this Troubleshooting Guide).

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Problem:

Improper inerting has occurred.

Solution:

Check O2 level on meters. Check nitrogen knives for proper angle and flow rate. Increase flow of nitrogen. Check to ensure knives are free of obstructions (EB only).

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Problem:

UV exposure is inadequate.

Solution:

Replace lamps as needed. Clean or replace reflectors as needed. Check focal point of lamps (UV only).

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Problem:

Substrate has contamination.

Solution:

Check substrate for oils or any other contaminants inhibiting cure.

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Problem:

Press speed is too fast.

Solution:

Check that press speed does not exceed UV lamp capability; may require additional lamps to increase speed. With EB, ensure that dose has remained at the same level as it was at lower speed.

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Problem:

EB window is contaminated or has developed pinholes.

Solution:

Check condition of window monthly; replace if necessary.

*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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