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Cracking of UV ink on plastic.
February 25, 2008

Question: Why might ink be flaking off a plastic substrate we're using?

Answer: The dyne level is 44 for the stock this printer is using, which is considered correct for the substrate. When a tape pull test was done in both directions, the pull was excellent. When the material was creased or slightly bent, there is a discoloration – lighter. When tape was applied, the ink came off in large chunks. And when the stock was tightly creased, the ink flaked off.
This problem can be caused by many items, however, the two I would look at first are:
1. Was the ink over-cured?
2. Was the ink formulated for a little elasticity?



Readers, please e-mail your questions to Ray.

Posted by Ray Prince on February 25, 2008 | Comments (0)