[Stoves] Cuber and size of densifying machines. (no longer Re: The wood and char and fuel "debate" )

[Richard Stanley]

Crispin, 
Interesting, we are also using the fibers to hold the blend together. They are softened by a combination of partial decomposition and pulping  to deform plastically (versus elastically) while still retaking some tensile strength. Herin lies the potential rub: In deforming by coning the cylinder the fibers than have taken a certain set, are torn apart and tend to lose their binding power. saw h this through several tests in Malawi in the mid 90's. You want a material that does not re expand more than 10% upon emerging form the cylinder if it does and it bound together with fibers you will have allow density mess. retaining it through drying would help in that case but you will have an awfully lot of plasic cylinders tied up if you are in daily production. This of course does not apply if you are using an inherent or added chemical binder.
The extradite has to com out pretty much direct out of a barrel or tube where the set taken remains: Here is one modification to a meat mincer I thought about tubes brazedonto the extruder plate of same ID and the holes on same plate…We slot the tubes to allow for water emission and recovery and to allow the tube ot open and close a bit which gives some flexibility for different blend roughness coefficients to more or less equalize the working pressure on the augur. 
(Not shown is the definate need for a sealed thrust or at minimum, tapered roller bearing in headstock) as meat is unnatural lubricant (gritty dirty water slurry of ago residues is less so).
Richard


Tom, we could get greater 0.5sg densities with care to pulverizing and particle size variations measuring infilling your method, Frank.  
In al however , I make NO CLAIM to fame on this one:  its just  a quick and dirty google Sketchup concept drawing !!!

On reflection,  for example, the cutter bar would probably not work unless rotting velocity as reduced well below augur rotating speed. 
   A cam-actuated guillotine perhaps??

On Mar 6, 2014, at 2:39 PM, Crispin Pembert-Pigott wrote:

Dear Richard
 
>Crispin, what densities are you seeking.
 
I actually have a burning condition in mind, not a density. It is to me, a simple matter to create a combustor that has controllable air, that than hoping to have a fuel that is always consistent. It is imply so much easier to build a better stove than a better fuel.
 
>I have not attempted pellet production but have no doubt that high pressure is not needed: Rather its more about attention  to blend particle density and size and variations between these (sorting coefficients) that makes the difference density wise. 
 
Your work has convinced me that is the case. Something that might work is forcing the mix into perforated plastic tubes that can be recycled, maintaining pressure on them as they dry.
 
I have had some success in producing densified marula nut ‘torteau’. This is an oil pressing operation and the output is a pretty hard cylinder of marula nut meat about 60mm in diameter. It can be broken by hand but it is pretty strong.
 
The trick is to have it pass along a pipe with vents that allow moisture out. The process starts with raw marula nuts which are very soft, oily and spongy and ends with a hard extrudate. If I did that with a digested mash such as you create I predict a similar result.
 
The pressing is done in two stages, but in one direction. First it is 90mm in diameter then 60, with a smoothed transition zone between. The effect is to unlock moisture in the centre of the 90mm diameter by kneading the material under high pressure. It is a manual press, classified as a ‘fly press’ by type.
 
I expect it would be over 0.3 density.
 
Regards
Crispin
 
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