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i don’t think brittleness is the issue – i think it is lack of pressure in the mold and speed/capacity of the machine are the main problems.
regarding safety. we joined the plastic beams with the wall with steel rods cast into the wall with concrete. should be safe.
thank you for the positive feedback.
regarding the length – we haven’t been able to produce beams longer than two meters, so the prototype showed above is quite small. around 1,5m, i believe. it is a toilet. regardless, the beams are probably not strong enough to cover larger spans by themselves. however, we are trying to solve this by triangulating the structure and join several beams. i will upload images, once we are further in the process.
i’m not aware of all the detailed specs of the motor. i will look into that and send more photos later.
we are not shredding and extruding at the same time.
we have used pp and hdpe – we haven’t tried mixing different plastics yet. we had better results using hdpe. we were able to extrude longer beams using hdpe and pp breaks more easily.
but i essentially have to acquire a machine with greater capacity in order to extrude beams at greater length?
thanks for the feedback.
we are trying to produce beams for construction of simple roof structures.
it is a 2,2 Kw motor, single phase and around 1400 rpm. we are using a compression screw.
very interesting work.
perhaps a stupid question: regarding the cold press model, what would happen if you didn’t press it and simply let it cool down in the mold?
i assume the surface facing upward would be uneven and have some bumps and perhaps a few bubbles. but would it be a cohesive sheet which e.g. water wouldn’t penetrate?