Machines and parts of machines for the preparation, weighing and mixing of raw materials for use in the manufacture of plastic materials, namely, compounders; Machines and parts of machines for the loading of machines for making plastic materials, namely, screws and barrels; Machines and machines parts for processing and treatment of plastic materials and composite systems made of plastic materials, the manufacture of profiles of plastic materials, panels of plastic materials, sheets of plastic materials and pipes of plastic materials as well as the manufacture of products consisting partially of plastic materials or of composite products made of plastic materials, such as windows, gutters, fences, interior and exterior wall cladding, namely, screws and barrels, extruders, extruding and calibrating tools consisting of calibration tables and calibration tanks for use in the extrusion of plastic and composite materials; calibrating machines, namely, calibration tables, vacuum calibration tables, and calibration tanks for use in the extrusion of plastic and composite materials; vacuum chambers; transporting machines and parts therefor, namely, haul-offs, profile haul-offs; sawing machines and parts therefor, namely, extruder guillotines, extruder saws; mixing and kneading machines and parts therefor, namely, screws and barrels, compounders, extruders