Grinding Cocoa Solids Into Powder
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Geek Gear - Cool Tools (Read-Only)
Oh boy, what a novice mistake. Thank you for catching it! 
This site has a useful chart on converting mesh size to particle size
http://delloyd.50megs.com/moreinfo/mesh.html
this site will send a 3"x3" sample of their 500 mesh screen. It may be large enough to work some magic.
http://www.twpinc.com/wire-mesh/TWPCAT_SS_Fine/p_500X500T0010W40T
Several of the charts referenced that a 400 mesh screen is as fine as can be made. Perhaps it would simply be impractical due to clogging and so forth.
Could you just run the powder through again after working it down to a 400 mesh screen? In theory the cocoa powder would continue to refine as it goes through the mill. I think it would just go through faster because the particles are already small enough to fit through the mesh.
This would probably result in an inconsistent size, but it may work...???
Another question I haven't thought of sorting out, is how small does the powder need to get to not be grainy in ice cream? Mark, do you know how fine your cocoa powder is right now? Is it as fine as a very fine sand (200 microns) or as fine as Portland cement (74 microns)
If the current particle size is large enough, then getting down to 37 microns may be a large enough improvement to work with.
Has anyone requested a quote from on the Pallman mills? http://www.pallmannindustries.com/chocolate_products_-_pulverizing.htm#Cacao" rel="nofollow"> http://www.pallmannindustries.com/chocolate_products_-_pulverizing....
I haven't bothered them, but I wonder how much one of their mills would cost. I couldn't find anything reference a finished particle size on their site, but if they are selling it as a solution to the chocolate industry, it must be pretty good.