Abstract: Vacuum system for collecting food products, the food products moving on one conveyor element, and the collection system executed by vacuum suction of at least one suction duct which transversely intercepts the conveyor element and bears a plurality of holes directed towards the conveyor belt, and elements for controlling the opening or closing of the holes. The suction duct acts as a shutter-valve, i.e. as a suction element, the stems of the cylinders are adapted to directly interfere, that is close or open, the corresponding passage hole on the suction duct. The stems of the cylinders pass inside the suction duct.

Abstract: Vacuum system for collecting food products, the food products moving on one conveyor element, and the collection system executed by vacuum suction of at least one suction duct which transversely intercepts the conveyor element and bears a plurality of holes directed towards the conveyor belt, and elements for controlling the opening or closing of the holes. The suction duct acts as a shutter-valve, i.e. as a suction element, the stems of the cylinders are adapted to directly interfere, that is close or open, the corresponding passage hole on the suction duct. The stems of the cylinders pass inside the suction duct.

Abstract: A selection machine and process for fine particulate material such as, for example, semolina wheat or other food or industrial products in powdery or granular form, where the particulate material is distributed on a continuous mobile support, is transported from the support to a scanning station for the identification in the particulate material, of undesirable parts thereof, and their position on the support, and, subsequently, to a sorting station having a photoconducting element that can be moved in synchronism with the support and on which photoconducting element is formed a latent image of electrostatic charges, corresponding to the position of the undesirable parts, which electrostatic charges separate the undesirable parts from the desired particulate material by electrostatic attraction.