ROI2C cylinder maker Used in the recycling of plasterboard, with the characteristic of pulverizing the plaster and not damaging the cardboard support. In particular, in addition to pulverizing the chalk, it is able to effectively detach it from the cardboard, thus obtaining after a simple sieving a chalk purity of over 99% and a presence of chalk in the paper of less than 3%. It is a machine of extraordinary robustness and stability, suitably sized to withstand maximum stress with minimum vibration.