Normal Process Ink Density on PVC

[D Ink Man]

Key, Cyan, Magenta, Yellow normal reflective density targets. Close to coated targets? Please respond if experienced; polyvinyl chloride substrate (PVC).

D ink Man

 

[RJ Litho]

Hi D ink Man .We run lots of plastic at standard coated densities .We calibrate to G7 standards at 200 lpi and have good success hitting our proofs .We run a lot of backlights and this has a different curve from all other plastics but still using g7 calibration .All plastic run with Black last curing yellow and if there are registrations issues we will turn lamps off in yellow.We run a -8% curve in our cyan due to stock color .We have gone from 10% UV jobs to about 50% with very good success.

regards
RJ

 

[D Ink Man]

Thank you RJ Litho, answered well.

D Ink Man

 

[kansasquaker]

I would love to hear from anybody else with experience. We've just started studying this. D Man, I think you'll find this varies with inkset used and probably with the stock. PVC can vary greatly.

I've only been able to get a full chart on once. Freaking stock is $2 per sheet . . . anyway, we cannot achieve anything close to coated densities. I have data I'd be happy to share if anybody is interested. We came much closer to matching Gracol 2013 uncoated than anything else. However, there is a yellow portion of the spectrum which we couldn't match. The above applies to Komori LS640, 29mil pvc (cheap), inx plaslam inks, no coating or varnish, 200lpi kodak trillian plates.

 

[D Ink Man]

kansasquaker, is your process UV cure or oil based ink? Dry trap or wet trap, important question? D

 

[kansasquaker]

It's UV cure. We're printing KCMY and curing after K and Y and at delivery.

 

[D Ink Man]

Thanks Kannsasquaker. That is interesting because there is a print customer that is running Y-M-C-K in a wet trap rotation.
Didn't get the full information yet, but this seems an odd combination.
The yellow may be printing 1/D for exactly the reason you said, lack of achievement of the color gamut. I do know they are having problems with the C/M trap and am in the process of correcting that with ink formulation. Also suggested to swop the rotation to M/C. Updates can be presented as more information comes forward. Thanks, D Ink Man