Digital BW, The Print

I have an old home made Ball Mill that should do for mixing/grinding, with the Daniel Smith product  as a starting point. I called Smith and Company, and they don't have a clue as to size other than very fine, I will see if I can get a size distribution, as is, as soon as I can. I have access to a pair of particle/cell analyzers where I work that should give me a good estimate of mean size and distribution of base stock and then what I can whip up. For a high concentration base stock, I think I will start by trying a 1 to 1 or 2 to 1 mix of your clear base C6a formula and the Smith carbon product with 15 lbs of 1/4" chrome balls (SAE 52100) milled for 5 hours at 200 rpm, and see what I end up with. Should be fun.

One last thing Paul, then I will go away and leave you alone for a while, could you expand on the bit about the "appropriate dispersion coating"  just a bit?  As in chemicals reacted with and covalently bonded to the carbon particles, or as in specific wetting agents to prevent particulate conglomeration, or something all together different?

Anyway, thanks again for the help and pointers.

Larry


From: pr_roark 
Sent: Sunday, March 07, 2010 2:55 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com 
Subject: [Digital BW] Re: Carbon Black, Lamp Black


  
"Larry Heath" <lgheath@...> wrote:
>
> ... what are the particle sizes and surface structure types of the carbon that you use or is in Eboni,

All of the inkjet carbon is ground very small so that it'll stay in suspension reasonably well. I've never found specific information on Eboni. However, I'm told it's slightly larger than the usual inkjet carbon, and that is why it's also less warm and settles faster.

> ...
> Do you know anything about of the general performance characteristics (on real paper) of the CAB-O-JET product line from Cabot corp.?

I'm told it is warm, like all the other carbon. I'd guess Cabot makes very good pigments. In fact, some have speculated the MIS Pk is a Cabot material, but the wholesale suppliers don't disclose their sources. I've been told by that supplier Eboni is not a Cabot product.

> ... I am looking for a dry product ...

Good luck. I think you'll find it takes special equipment and serious chemistry background to get an appropriate dispersion coating on the particles. That is where a significant amount of the competition seems to be.

Paul
www.PaulRoark.com 





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