Re: VOP (was Dumb question for european prepress specialists)
Re: VOP (was Dumb question for european prepress specialists)
- Subject: Re: VOP (was Dumb question for european prepress specialists)
- From: Rich Apollo <email@hidden>
- Date: Mon, 28 Nov 2005 16:38:36 -0600
I think that the ink producers will differentiate the inks for 4-
color perfectors versus 4-color.
And change some tack if needed. But they don't deliver VSOP inks
for VOP's. (Very Old Presses!) Printers will sometimes have to use
additions for special applications but there seems no need to
differentiate ink based on presses (Heidelberg versus Roland-Man)
or new versus old. There are a huge number of other selection
criteria (packaging versus leaflets or short life time versus long
life time or long sun-exposure). But that's mostly physical and
sometimes influences the selection of pigments. Those specialities
sometimes differ from ISO 2846-1. But these differences can be
measured and described so the printer can take the needed steps to
correct the color. If needed. The other criteria for print (plates,
dot structure, dot gain, ink-water balance etc. etc) have a far
greater influence. The goal of combinations of standards such as
ISO 2846-1 and ISO 12647-2 is that more printers can print (on
different presses) identical magazines. So the advertiser may
expect identical colors. And the editor will benefit too. And all
other customers. They get what was agreed and shown on a proof.
Yes, more skills are needed to reach that situation. And more
skills and experience to create a stable process.
Rich,
if you refer to very old presses an unacceptable dot gain could
occur. Yes, than you have to use a few more tricks to correct that
behavior. If the dot gain is always unstable (very old press) there
is no reason to print according to any standard. Use such a machine
for other products.
I think,
Regards,
Henk
You miss my point, Henk. The printer in Miami, being in a warm, humid
climate at sea-level printing on an older press might require an ink
with some different characteristics than the printer in Denver;
Denver being colder, much drier, and a mile above sea-level. Presses
of different vintages made by the same manufacturer on our press
floor display some different behaviors. And that's with the same
chemistry, ink, blankets, plates, paper, climate, et cetera. The
point is that the different inks could conform to ISO-2846-1 and
exhibit some different characteristics when they hit the paper.
GANS lists 13 process ink sets on their web site. They list an
additional 9 black inks. Superior lists 13 different process sets on
their web site. They have 9 other categories of ink listed. Kohl &
Madden has 10 process sets in the "Sheetfed Offset" category. None of
these are "specialty" inks. These are just process sets for sheetfed
presses. Flint-Schmidt lists 12 process sets.
Rich Apollo
314-344-1144
email@hidden
www.prioritylitho.com
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