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To be precise, UV inks don't "dry", they cure. How did you evaluate UV Cure? Physical rub test, Chemical resistance. Are UV lights guarded/shielded so no light (radiation) is striking or "Flashing" the plate and curing there? Dry-up/catchup, tinting/toning, scumming/sensitivity all look...

Ask your vendor's (ink, paper, device) if they profile for you as a free service?

You didn't mention what the specific quality issue is? Image sharpness from poor focus? Loose fit in press plate clamp?

Did roller vendor recommend EPDM composition?

A packaging structural designer or die maker should be able to answer that. I think a higher number of smaller perfs will be "stiffer" and have more memory. A folding carton packing QC lab often has a machine to measure force to open & close folds. Also, on the folder/gluer, how much of a...

Magnus, I agree with your statement. When an ink guy tells a press guy to run to a lower density, that might be interpreted as meaning a thinner ink film thickness (IFT). The ink fountain blade keys or ball/ductor sweep will be less because it's stronger. Doing a side-side ink draw down (Little...

Low cost solution is bring both characterization data sets into Excel and calculate a Delta E for each pair of patches (1,617 if IT8.7/4). Then do some basic stats for average and standard deviation. Could even make a histogram.

Check the grain direction of both your and their samples? Are they using any perforations instead of crease/scores?

Outsource to a trade/packing printer who has a press with an UV anilox coater in unit #1 to lay down opaque white first. Use a flexo relief plate. If customer doesn't care about how the inside of the box looks, print on white litho wrap sheet to match kraft color, then emboss corrugate texture...

When you run an ink to a lower SID it usually for 2 reasons. 1) It is stronger, has more pigment concentration. 2) It has more dot gain, so you are compensating instead of making a new curve.

Yes, my brother Joe unfortunately passed away in March 2018 from a severe stoke. At the time he was working for Heidelberg after being at GATF in Pittsburgh.

Do you know the Lab values of your current ink set, as well as SID (solid ink density) & TVI (tone value increase). Curious, if you changed ink vendors with regular inks, would you use the same old ICC profiles and plate curves or would you re-fingerprint?

You mention a long-time frame, over years. I assume you have a standard test image printed from then vs now, with exactly the same settings and conditions. How do you know your media paper is stable and not causing the color shift?

How about this for Xerography basics?

Are you applying via coater roller or anilox? Do you know your coat weight? Are you stirring/agitating drum constantly (solids settle)? Maybe do a fingernail scratch test every hour for 8 hrs after printing to see if drying time does have an effect?

Have you checked the coating weight? Maybe you're putting down too much? Is the anilox volume (BCM) and viscosity (Zahn Cup) correct for the application (cosmetic gloss vs functional)? Also, what about squeeze pressure (stripe) between coating blanket and anilox and coating blanket and back...

ps: Buffalo News is over 150 years old. Buffalo's 2nd daily newspaper "Courier-Express" closed in 1982. Mark Twain was an editor from 1869-1871.

The Buffalo News is now printed in Cleveland, 3 hrs away! How are they going to report on Bills vs. Browns football? Warren Buffett of Berkshire Hathaway owned from 1977-2020, then sold to Lee Ent. for $140M. Building and property is in center of downtown and worth more than the business.

That's fine for objective, factual errors (text & art). But what about subject press to proof color matching? Is the color match close/good enough? Anyone recall the old "Printers Trade Customs" that use to be printed in light gray ink in 8 pt type on the back of the quote? It's "Commercially...

Is the goal to have your proof match your display (soft proof) or to match the press?