Recycling machines for plastics; cutting, comminuting, compacting and homogenizing devices for plastic materials, plastic foils, plastic bottles or plastic waste; machines for the heat treatment of plastics; machines for the solid phase polycondensation of plastics; extrusion machines; intrusion machines; extrusion machines for plastic and parts thereof, namely extruder screws, plastic melt filters, filtering devices for plastic melts, backwashing filters, screen filters, screen changers, screens and filters for extruders; degassing devices for plastic extrusion machines, degassing devices for extrusion machines; machines for processing plastics and plastic waste; machines for recycling treatment of plastics and for treating waste, in particular plastic waste, biomasses or household waste; machines for plasticizing plastics; machines for agglomerating plastics; machines for comminuting plastics; machines for granulating plastics; machines for filtering plastic melts; machines and machine parts for all the aforementioned foods included in this class