Dear Xavier I one bothered to design a manual 16 cylinder (square) pressing system for the 65 x 65 mm briquettes shown on the NDE website.
It was never built other than a test of the main press components (the part with the 16 cylinders) plus the ejection mechanism. There is an ani.gif file of it working somewhere. It was developed for the Bloemfontein Super-Max Prison. Because pressure is not a big issue for this type of briquette I suggest it is not worth investing in a lot of 'high pressure' for extrusion. Would you be OK with a continuously extruded hollow briquette? Cut it to length later? It is not difficult and would get past this batch loading and unloading of a single one. There is a lot of improvement available. An advantage of a small motor press is that some of the pulping will continue throughout the process which may compensate for poor preparation. Making a spiral on a shaft in a simple workshop is surprisingly easy - even a thick blade. They can be turned by hand to great effect. Regards Crispin _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
