Re: Fingerprinting or profiling presses
Re: Fingerprinting or profiling presses
- Subject: Re: Fingerprinting or profiling presses
- From: Rich Apollo <email@hidden>
- Date: Mon, 25 Jul 2005 09:03:49 -0500
On Jul 23, 2005, at 1:32 AM, email@hidden
wrote:
From: Steve Lehning <email@hidden>
Subject: Finger Printing Press with Aqueous Coating
We are going to be running some press tests on our
presses to come up with plate curves for GRACol dot
gain standards. On our higher end number 1 and number
2 stocks we run a vast majority of our work with
Aqueous coating. We have a debate going on as to if we
should run these test with Aqueous coating or not. We
have had jobs depending, on the stock that the Aqueous
coating shifts color on us which causes some grief
amoungst the sales staff. So the question arises does
Aqueous coating change the dot structure and gain
enough to configure this into our equation when
analyzing data from the press.
Steve Lehning
Steve,
I don't think you'll find that dot structure or dot gain change with
the application of aqueous coating. Depending on the character of the
coating, though, color will change. Even the highest gloss, non-UV
coating will lower your SIDs and saturation, and lighten your black
point due to the surface scattering light. And nothing is perfectly
transparent or colorless. Apply a dull, matte, or satin coating and, of
course the differences will be even more significant.
I haven't measured ink trap differences, but I suppose the coating unit
could be pulling up some ink. You would do well to see what is
happening to gray balance.
If you're running a significant amount of work with coating, then by
all means run it on your press-test.
Unfortunately, I don't have a UV coater at my disposal, so I can't
speak to that at all.
By the way, GATF is doing some testing on the effects of coating. You
might see if that information is available.
Rich Apollo
314-344-1144
email@hidden
www.prioritylitho.com
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