Digital BW, The Print

It's possible that you using the wrong kind of transparency film.  If the 
film that you're using doesn't have a prepared layer or has a layer designed 
for dye, then pigmented ink won't adhere or dry properly.  The correct type 
of transparency will be slightly milky in appearance and also be tacky to 
damp fingertips.

The real difference in PK and MK inks on properly prepared inkjet 
transparency lies in durability of the dried ink over time.  Reports seem to 
suggest that PK inks hold up a bit better.

I haven't had any problem getting matte black (or other colors of Epson OEM 
inks) to stick to mylar transparency film that has been prepared for 
pigmented inks.  I, also, haven't used the results for vacuum frame 
printing, but since a whole industry subset has adopted inkjet technology in 
the screen printing industry I would be surprised for this to be an issue. 
Unfortunately I don't have any links handy to include for suppliers.  If any 
of you are interested (let me know on the list) I'll follow up this email 
with a couple of links for mylar transparency designed for pigmented inkjet 
use.

-Lloyd Braddy



----- Original Message ----- 
From: "Steven Karafyllakis" <stevekphoto@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, February 19, 2008 8:21 PM
Subject: [Digital BW] Re: problem with matte black ink sticking to 
transparency film


David;

I'm not surprised you're having trouble keeping the ink on the film;
you really do need to use the
PK ink, and if that doesn't give you enough density try a combination
of magenta and yellow to produce red. The dark magenta in particular
can look every bit as 'grainy' as the K inks, you should still be
able to get the effect you want.

Steve Karafyllakis

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "David"
<dkfreed@...> wrote:
>
> I'm been printing digital "positives" on transparency film to use in
> making photo-polymer etching plates; similar to digital negatives,
but
> I'm printing positive images with black ink only at 720 or 1440 DPI,
> because I want to get a dot/grain pattern that will become
the "bite"
> in the etching plate.
>
> I'm been doing this on my Epson R2400, using the Quadtone RIP
> software, so I can print with black only ink. I have been using the
> Matte Black ink cartridge because it seems to give better opacity
and
> coverage for this process (I read something similar about using this
> ink for digital negatives as well).
>
> The problem is that on the transparency films I've been trying, the
> matte black ink never seems to become permanent and I can smudge it
> with my finger. I thought this might not be a problem if I handled
the
> sheets carefully, but under the pressure of the UV exposure unit
> (similar to a big contact print frame but with much more pressure),
it
> seems the ink is getting smooshed against the plate and causing
random
> rings and marks to show up in the final image, especially in areas
> with continuous tone.
>
> I'm wondering if people are having success with using the Photo
black
> ink to print digital negatives, or if anyone has found a
transparency
> film that will accept matte black ink?
>
> Any advice or suggestions would be helpful.
>
> Best, David.
>




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