Digital BW, The Print

pr_roark wrote:
> I put some links to HP Material Data Safety Sheets and other 
> information, as well as some of my notes on these inks at 
> http://www.paulroark.com/BW-Info/HP-Vivera-Notes.pdf  
> 
> Needless to say, HP appears to have done a terrific job here.
> 
> Paul
> www.PaulRoark.com 
> 
> 

Paul,

the link in the article:
http://www.paulroark.com/BWInfo/Pigment-Stabilization.pdf
seems to be disconnected.
Wonder if the article you refer to is:
http://www.paulroark.com/BW-Info/R1800-Lightfastness.pdf

Steric, isn't that related to fatty acids: butyrates 
(butteracid in my Dutch conscience) ?
This one a  basic ingedient of ABS "the stronger styrene 
plastic".
Styrenes that all yellow in time.
Didn't expect a styrene component in the pigment 
encapsulation, acrylic, PVA, are all more clear and stay 
more clear. My first silkscreen waterbased ink (dispersion) 
made by Unico was based on an acrylic/styrene mix but I 
thought at that time that the styrene was added to reduce 
the ingredient costs. It probably is more related to the 
behaviour as a pigment particle in the dispersion than to 
their color quality.

Checking it on a wider brain,

I see the butyrate is used in mixes of acrylic and styrene 
for the encapsulation, BASF people,
http://pubs.acs.org/doi/abs/10.1021/la015734j

Nothing on Electrosteric in Wikipedia but this one gives the 
more general overview:
http://www.patentstorm.us/patents/5639296/description.html

On more water in the Vivera ink, there will be more water 
vaporised in the thermohead than it is in a pi\ufffdzohead, at 
least the technology suggests that. What lands on the paper 
may be of equal rheology compared to the Epson inks. Some 
ingredients will have to do with the different jet 
technology and the head's materials they come in contact with.

Some thoughts on using Vivera inks that lingered in my head 
longer than today:

The use of Vivera inks (or V7 mixes made of them :-) in 
pi\ufffdzohead designs must be possible while the other way 
around Epson inks in HP heads is less likely to work 
consistently. The higher water content may be an obstacle 
given their use in a pi\ufffdzohead. You gave the MSDS sheets for 
all monochromes but the gloss enhancer which could be a part 
of a V7 mix. Big carts of the monochrome inks (but the GE 
cart) are available for the Z6100, 750 ML the price drops to 
approximately 20-25 Eurocents a ML without VAT. The twin 
pack 130 ML carts (260 ML) of GE will be something like 30 
Eurocents a ML.

There's a reason for using pi\ufffdzoheads as the alternative 
quad drivers (QTR for example) for HP models do not exist. A 
pity as the head technology in the B9180 is really good and 
the heads are user replaceable. Anyway that B9180 already 
makes a very nice matte B&W print with the Vivera pigment 
inks it uses. The same heads I have in my Z3100 and not one 
replaced in 20 months and no clog problem either. Maybe QTR 
will one day cover the HP models as well.


-- 
Met vriendelijke groeten, Ernst


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