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How to run polystyrene on a litho press—sans set-off.
February 19, 2008
Question: How do I eliminate set-off when running polystyrene on a conventional litho press?
Answer: Set-off is a problem that most paper printers have learned to deal with, but plastic printers are still learning to deal with the problem. Polystyrene can be run successfully on a litho press without the use of UV inks if certain things are done:
1. An ink should be formulated for the plastic.
2. Run small lifts—about 3´´.
3. Use IR to accelerate drying and setting of the ink.
4. Many printers like to add a drying agent to the ink. The one that most use is Speedy Dry.
5. Once the load is removed from the press, take care not to jar the load.
6. Do not re-pile for at least 12 hours. Yes, this is being overly safe.
7. Don't forget to run spray powder.
Readers, please e-mail your questions to Ray.
Posted by Raymond Prince on February 19, 2008 | Comments (2)
