Picking on Silver stock

[Freeman A.Gain]

Hey all,

I'm having a bit of an issue with printing on silver foil repo stock. Two form with opaque white and then 4 colour. First one had basically spot opaque, then 4 colour. Ran fantastic! Second one was almost a flood opaque, with some knockout for silver to come through. When I went to print 4 colour on top, white lifted/pulled off! Shizer! Need to try and salvage what I can, stock will be 1-2 weeks away if needed. Any ideas? Coat with AQ? I'm at a loss?? Probably should have ran a primer coat first, but too late now!

Thanks for any input

 

[Bob Peterson]

Couple of questions before I can make a recommendation:

1. Are we talking sheetfed or web?
2. Oil Base, Flexo, or UV Ink?
3. Was the ink formulated for non-pourous substrates?
4. Was the foil a film laminate or metallized with a top coat?
5. Did the white pick off only where you were applying the 4/C process?
6. Has this job already had an aqueous coating applied?
7. Can you post some pictures?

 

[Freeman A.Gain]

Thanks Bob,
1) Sheetfed
2) UV ink
3) Flint UV Opaque white, 7700 series, but not high adhedsion
4) Not sure.. repo vinyl. I think foil?
5) Only in certain spots.. full coverage white with almost full coverage 4c
6)No AQ applied yet
7) Probably not, but I will try.

Cheers

 

[chevalier]

Sounds like the metallic foil did not have enough surface tension for the UV ink to bind to. A primer coating prior to printing is probably the best solution.

 

[Freeman A.Gain]

Yes, whats the expression? Hidesight is 50/50! Made notes for next time... ABSOLUTELY!!!

 

[Bob Peterson]

Alright, based on what you've indicated the problem may be due to the following or combination of each:

1. Providing the vinyl is not top coated, it could be due to a very low dyne level of the substrate. If you have any virgin stock left over, have Flint or a local ink company check it. It should be above 38 dynes/cm.

2. First down white not fully cured. Opaque white is the most difficult color to cure. Furthermore, if your double hitting the white, you should have a lamp after each unit. Also, check the lamp output at each unit and make absolutely sure that the reflector is clean and not hazed. A hazed reflector will diffuse the UV light/energy and slow cure speed.

I hope this helps. If you have any questions feel free to send me a PM with your phone number and we can talk.

Regards,
Bob

 

[Freeman A.Gain]

Thanks a bunch Bob!

I have a dyne pen and it reads over 42( highest one I have). The UV is cured. New bulbs and cleaned reflector are a certain. Lots of maintenance done, regularly.

I guess my question really is - Can I save the job by doing something to the white to make it work? I will be attempting to AQ coat it then 4c. Fingers crossed, but its probably hooped?