Machines and machine tools for treatment of materials and for manufacturing; machines for processing plastics and plastic waste; recycling machines and installations for plastics; machines for the recycling treatment of plastics and for treating waste, in particular plastic waste, biomasses or household waste; cutting, comminuting, compacting and homogenizing devices for 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; machines and installations for the heat treatment of plastics; machines and installations for the solid phase polycondensation of plastics; extrusion machines for plastic and installations thereof; intrusion machines [plastics injection forming machines] and installations thereof; extruders for plastics, extruder screws, plastic melt filters [parts of machines], filtering devices for plastic melts, backwashing filters [parts of machines], screen filters [parts of machines], screen changers [parts of machines], screens and filters for extruders; desgassing devices, desgassing devices for extruders for plactic material; all the aforementioned being machines and machine parts for the treatment of materials or plactic wroking