Machines for plasticizing synthetics, machines for agglomerating plastics, machines for comminuting plastics, machines for granulating plastics, extruders for plastics, extruder screws, machines for recycling treatment of plastics and for treating waste, in particular plastic waste, biomasses or household waste; machines for filtering plastic melts, plastic melt filters, degassing units, filtering devices for plastic melts, degassing devices for extruders for plastic material, back-purge filters, filtering screens, screen changers, screens and filters for extruders, cutting, comminuting, compacting and homogenizing devices for plastic materials, plastic foils, plastic bottles or plastic waste (all said goods are machines or part of machines)