Ink film too heavy.
Run thinner ink film / strengthen ink. (Normally not a problem with EB).
Ink is over-emulsiﬁed.
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).
Improper inerting has occurred.
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).
UV exposure is inadequate.
Replace lamps as needed. Clean or replace reﬂectors as needed. Check focal point of lamps (UV only).
Substrate has contamination.
Check substrate for oils or any other contaminants inhibiting cure.
Press speed is too fast.
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.
EB window is contaminated or has developed pinholes.
Check condition of window monthly; replace if necessary.
*The solutions provided from the troubleshooting guide are general in nature, please contact your sales or technical representative to discuss specific issues.
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