I’ve seen that humidity deteriorates plastic properties during the conformation of products, so it has to be completely dried after been washed. Un our project (Up! Energia) we built a rotatory dryer (also called trommel) to dry coffe grounds. It is the first version but it can be built from scrap and powered by a pellet or sawdust stove. If you want to develop a new machine for that feel free tocontact me! 🙂
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