Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@y..., "Robert G. Morrison" 
<rmorrison@p...> wrote:


(snip).
> 
> 
> Apparently they had problems initially with clogging but have a 6 
nm grind
> now...wow jet grinding has come a long way since I was in the 
business.
> Apparently they have multiple users running desktop printers with a 
CIS.

Robert,

What is jet grinding? I have been out of the busness for a long time 
now but for volume production horizontal and vertical (Morehouse) 
sandmills with lead crystal or zirconia shot were the way to go. 
Vibratory mills (Sweco?) were very good for small batches but output 
was low.

Are they milling the carbon at high viscosity (40,000+ cps)and 
letting down or are they working with more dilute solutions?

Martin Wesley


> 
> > What black do they use?  Do they have a pure colorant that is 
blacker than
> > carbon (more like dark brown, from what I can see) and just as 
fade
> > resistant?  If so, that would be of real interest as a quad 
feedstock.
> 
>  Don't know...but I would guess that it is still carbon 
black...however, the
> grind is critical.  If you can get a really fine grind...the 
particles will
> pack tighter and give you a look more like dye.  Large particles 
have more
> space that isn't black (particles on average are spherical).


Lamp black from the combustion of acetylene perhaps?

Martin Wesley

(snip)