7 Machines and apparatus for the plastics industry and for process engineering, in particular machines and apparatus for treatment and processing of plastics, and laboratory and pilot installations, namely, machines for plastics treatment and processing; rolling mills, in particular testing rolling mills, measuring rolling mills, and rubber rolling mills; calendar machines, in particular sheeting calendars, dual-roller calendars, laminating calendars, moulding calendars for trays and polishing calendars; squeezer machines, in particular plate presses, test presses, vacuum presses and high-temperature presses; kneading machines for industrial purposes, namely, two-roll kneading machines; extrusion moulding machines, namely, metal extrusion presses and extrusion installations, namely, twin-screw extruders, test extruders, measuring extruders, rubber extruders; pelletizer machines, in particular strand palletizers and die-face palletizers; pipe extrusion machine installations, namely, pipe extrusion machines, co-extrusion installations, namely, co-extrusion machines, cast-film installations, namely, extrusion machines for cast-film, extrusion coating installations, namely, extrusion coating machines, and blown film installations, namely, extrusion machines for blown film; machine tools in the nature of stretch installations, namely, stretch machines; machines for production of extrudates for medical purposes; machines for manufacturing of medical compounds, moulding calendars, catheter tubes and infusion bags