Digital BW, The Print

Paul,
  The majority of aqueous ink-jet inks are indeed Newtonian in character however to get to the "crux of the matter" the average viscosity of good, durable, ink-jet inks is between 2.1 to 2.6 Cp - Brookfield, with a surface tension rating between 37 to 42 and a pH between 7.5 and 9.
 
That is, as I say the general range not necessarily what everyone is developing. 

Regards 

John 
  
 
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Dr. John Edmunds
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----- Original Message ----
From: Paul Roark <paul.roark@...>
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Sent: Saturday, 10 February, 2007 1:03:48 PM
Subject: [Digital BW] Ink viscosity (was Another Question(s) for Paul Roark or anyone else who knows)

This introduces some variables that are beyond what my little
experiments (and brain) can deal with. I doubt we'll find much willingness
of the large companies to publish their data on the dynamic viscosities of
their non-Newtonian inks and the relationships with increasing frequencies
required for higher speed and higher resolution printing. However, my guess
is that pigmented inks and these imperatives of competition are on a
collision course. And I wonder how the Claria inks fit into all this. Are
they Newtonian?

All very interesting. As a practical matter, the solution for me is to just
shove some UT-R2 inks into a 260 and see what happens. (Which is exactly
what MIS should be doing about now.)

Paul

www.PaulRoark. com <http://www.paulroar k.com/> 

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