[Stoves] Plans and actions wedgies presses and invite to Guatemala

[Crispin Pemberton-Pigott]

Dear Richard

I am not disputing the ease with which one can fill and balance the multiple cavities, the same holds for bricks however...

The water has to be added and then removed both of which require work. If you can avoid it, do so. 

The suggestion was to make a sort of pie-shaped briquette. As there is a 'parallelism' involved, it means the pressure in each briquette is additive. If there were 6, it would take 6 times the total pressure of one. 

Putting them in series as a stack would require the same pressure as 1 but make six at a time, using 6 times the stroke distance. It is much cheaper to build for a long stroike than additional pressure. 

As they are in a line, the need to fill thenm equally does not arise. 

Regards
Crispin
-----Original Message-----
From: Legacy Mail <rstanley at legacyfound.org>
Date: Tue, 30 Oct 2012 23:57:48 
To: crispinpigott at gmail.com<crispinpigott at gmail.com>; Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
Cc: Stoves<stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] Plans and actions wedgies presses and invite to	Guatemala

Crispin , 
Beg to differ here. liquifying assures far faster filling (you set up the top surface of the cylinders with a flat sheet thibk cupcake mold with slightly raised 25-30mm high) sides. One then just pours the slurry in and  screeds/ squeegees  it over the cylinder tops and voila , near immediate filling . You need to make the cylinder more porous (2---2.5mm dia holes on 1 cm centers), to bleed off the fiber rich water which is recovered to feed stock . Drying time is about the same 4-5 days to ambient humidity under natural drying conditions.
Richard

Sent from my iPhone

On Oct 30, 2012, at 17:55, "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> wrote:

> Dear R and P
> 
> Having faced this problem with our 2-Up brick machine albeit at much higher pressures I found the answer is a robust machine and operator training. After a time the operators just get good at loading the cavities. It was very important to our production process that the mix NOT be a slurry because of the extended drying needed, though it is a workable idea. 
> 
> In Lubumbashi 205 workers using 41 manual machines made 1.3 million bricks in one month (Oct 2010) using 11% moisture clay. The cavities are filled individually but compressed in pairs. I was as impressed as the frogged side of the bricks!
> 
> I concur that the mix is critical but people get very good at the art of batching...
> 
> Regards
> Crispin
> -----Original Message-----
> From: Richard Stanley <rstanley at legacyfound.org>
> Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org>
> Date: Tue, 30 Oct 2012 16:38:29 
> To: Paul Anderson<psanders at ilstu.edu>
> Reply-To: Discussion of biomass cooking stoves
>    <stoves at lists.bioenergylists.org>
> Cc: Stoves and biofuels network<Stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Plans and actions wedgies presses and invite to
>    Guatemala
> 
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