Making a mobile oven, or mini-kiln; for melting plastics originally but whatever you need to bake. Pick or make the right caster wheels for the sort of mobility mini-kiln usage requires.
Plastics constitute a significant portion of the Agbogbloshie waste stream, moving through stages of collection, sorting (by type and colour), cleaning, shredding and even in some cases molding into pellets. (See Plastics blog post). With at least 7 micro-factories by our count, Agbogbloshie is a key part of the plastic recycling industry in Ghana, and integrally interconnected with both local and global production cycles. To date, the failure of Agbogbloshie’s industrial ecosystem to add value to plastic material recycled on-site is a lost opportunity for local manufacturing.
Building on our experiments with plastic during AMPQAMP and drawing on the knowledge and expertise of oven fabricators based on the ground in Agbogbloshie, we are now co-designing and prototyping a mini-kiln. This week, William Mensah completed fabrication of the first prototype in Accra Timber Market,adjacent to Agbogbloshie. The mini-kiln fits the standard module of the AMP spacecraft and is one of the first tools from the AMP tool-set developed to plug into the community workshop.
The prototype, is composed essentially of a frame of angle bars, inner and outer layers of sheet metal with a layer of what is locally called “fibre” (PUR foam insulation sourced from air-conditioner dismantling). We didn’t finish until evening, but couldn’t wait to test. Hence using shredded plastics from Agbogbloshie, we made new recycled plastic tiles, heating the the plastics to their melting point, and allowing them to cool. We intend to carry out carry more of such low-high tech plastic experiments soon in our spacecraft. Stay tuned for more and be sure to share with us, your innovative ideas regarding plastic recycling.
+Need to add chimney, temperature gauge, and calibrated gas control.
+Cost compare with 2-module wide unit, cylindrical drum cast concrete or clay insulated.
+Link with rotational plastics moulding machine:feedback-enabled temperature controls.
This was the first time we welded a complete full-length octet truss. Rudimentary structural tests after fabrication demonstrated good performance/strength but unacceptable dimensional tolerance (i.e. it was strong, but not precise).
Special thanks to Chamil, master maker at the Kokrobitey Institute makerspace, who suggested to develop a 2d truss jig (to hold 1in angle bar frame straight and square while welding) and square pyramid jig (to enable standardized production welding of square pyramids, as a component for full octet truss).