QTR-Quadtone RIP

MyronG <goch@...> wrote:

>
>
> Paul Roark's Carbon-6 / Eboni-6 inks appear to have only one downside:
> relatively fast settling-rate for the Eboni particles.
>
> As Paul points out in http://www.paulroark.com/BW-Info/Ink-Mixing.pdf,note 4, this is an issue only for large-format printers, in which the
> cartridges themselves do not move with the head. Paul solves the problem by
> removing and agitating the cartridges before each printing session.
> ...
>

It would be great to figure out a way to solve the settlement issue.  I
might note that the blended carbon + color inksets can suffer from
significant separation also.  See page 4 of
http://www.paulroark.com/BW-Info/4K+.pdf

When I got my 7800 I opened the pressurized cart to see how it was made.  I
was disappointed that Epson had not taken the opportunity to make the
pressurization system also an agitation system.  If they'd put a balloon in
just part of the cart -- like at the center of the bottom -- so that it
could be inflated and deflated a number of times in a warm-up cycle, I think
they could have had their positive pressure as well as agitation, and their
pigs sink also, just not as fast.

Let us know if you come up with a good system.  In the meantime, agitating
the carts is not that burdensome.  So far the seals hare holding fine.

On the other hand, I understand the hassle very well.  I note that the HP PK
in my generic base settles less than the OEM HP Grey ink.  It also does not
separate, color-wise nearly as much as the other B&W blends I've tested.
 The reason is simple, the Epson bases can be more viscous.  At any rate,
the HP PK + Glop is now in the 1100 and 1400, and will be in the 7800 if
these tests continue to look good.  For neutral B&W with less fade
resistance, but also with a number of significant advantages, I have high
hopes for this HP-Glop blend and a much more hassle-free and flexible
approach for those who do not need 100% carbon.  See
http://www.paulroark.com/BW-Info/1100-HpGO.pdf

Paul
www.PaulRoark.com


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