7 Machines and their parts for working and processing plastic materials, namely, pelletizing machines, spin beams, spin pump gears, extruders, screw extruders, single-screw extruders, extrusion machines for mono- and multi-filaments, dryers for multi-filaments, dryers for bulk materials, recycling machines, process water machines, and pullers for pulling round or square profiles, pipes and tubes, and sheets and films