Machines for processing plastics and plastic waste; recycling plants for plastics; machines for the recycling treatment of plastics and for treating waste, in particular plastic waste, biomasses or household waste; devices for cutting, comminuting, compacting and homogenizing plastic materials, plastic foils, plastic bottles or plastic waste; machines for plasticizing plastics; machines for agglomerating plastics; machines for comminuting plastics; machines for granulating plastics; machines for filtering plastic melts; plants for the heat treatment of plastics; plants for the solid phase polycondensation of plastics; extrusion plants; intrusion plants; extruders for plastics, extruder screws, plastic melt filters, filtering devices for plastic melts, backwashing filters, screen filters, screen changers, screens and filters for extruders; degassing devices, degassing devices for extruders for plastic material; (all the aforesaid goods being machines or machine parts).