Methods of detecting slightly wet ink

[redbullmoo]

We print laminated web sometimes covering it with varnish, sometimes not. The problem is when it is rolled and formed into cylinders, sometimes we find that there is wet ink. The web is rolled and run through a seaming machine using an RF block. It seams that the RF block can loosen the ink and allow it to smear through the rest of the process. The ink issue is not detected by tape test during printing. The dyne level is acceptable so it certainly appears to be a cure issue, not adhesion.
Any ideas on how we could detect issues similar to this one?

 

[Cornishpastythighs]

Is this UV ink or conventional? Have you done any rub tests on the product Gardco :: Sutherland Ink Rub Tester
When you cover with varnish does the issue go away?

 

[redbullmoo]

We are running UV ink and have some calls out on ink rub testers. Would the rub testers be the easiest / best way to go?

 

[Cornishpastythighs]

First I would check out your UV system to make sure it is giving you the best cure. Lamps, Reflectors etc. Also maybe get some extra Photo initiator added to the ink if you suspect the ink is not curing properly even though your UV system is working up to spec. I would try and correct the cure issue rather than go out and buy an expensive rub tester.

 

[D Ink Man]

I would suggest the MEK test, for sure cure. D