Extrusion International 4-2017

37 Extrusion International 4/2017 Gneuss offers complete lines including the up- and down- stream components from the material dosing system to the die, roller stack and to the winder, which are all tailored to the exact requirements of the individual customer. The Gneuss GPU can also be used to produce foam sheet from PS or PET with up to 30% weight reduction and even higher depending on the application. The system is fully flexible and no mechanical changes are necessary when switching from transparent sheet to foam sheet production. Also the use of up to 100% PET Bottle flakes is possible in both applications. Revision of process and pressure constant Rotary Filtration Systems for the widest range of different applications Both the RSFgenius as well as the SFXmagnus ranges have been completely revised during 2016. Modifications to the screen changer housings permit operation on a wider range of applications at higher pressures, whilst offering enlarged active filtration areas. Components and modules have been commonised between the two ranges in order to offer even more attractive value for money and shorter delivery lead times. The patented RSFgenius Filtration Systems operate fully-au- tomatically, process and pressure-constant and with a back- flushing system with unmatched efficiency. They are there- fore especially suitable for demanding applications with high quality requirements. The SFXmagnus range of automatic screen changers is char- acterised by an extremely large active area in a compact unit. This range of screean changers is available with or without an integrated back-flushing piston depending on the exact re- quirements of the process. New for PVC processing is the SFpvc R, a further development of the SFpvc. Bothmodels are designed specifically for challeng- ing PVC recycling applications but the new SFpvc R offers for the first time an integrated self-cleaning (back flushing) system whilst maintaining absolute process-constant operation. Highest quality, short delivery times: even for individual, tailor-made sensors Gneuss offers individually tailor- made melt pressure and melt temperature sensors even outside of the typical market stan- dards. As a machinery manufacturer, Gneuss has the manu- facturing capabilities to realise even unusual sensor require- ments. The lean manufacturing structure at Gneuss makes this possible with shortest delivery times. Gneuss sensors are available to match regional or application – specific require- ments such as Atex, Hart Communication or EAC. The new DAIL melt pressure transducer range from Gneuss is a special addition to the range, specifically for pressure over- load protection. Whether as an economic single sensor system for standard applications or a complete system solution for explosion hazard environments, Gneuss has a pressure moni- toring system for every application. Gneuss Processing Unit (GPU) gives Sheet PET Lines increased Flexibility and Food Contact Certification In the worldwide growth industry of PET packaging sheet, Gneuss has installed over 20 tailor-made sheet lines over the last few years. Gneuss´ customers find the extreme flexibil- ity of the Gneuss Processing Unit (GPU), consisting of MRS extruder, Rotary Filtration System, Online Viscometer and Control System completely convincing when processing PET, whether virgin or recycled material and with or without food contact requirements. Within the packaging industry, the use of PET sheet is on the increase and the use of recycled material is likewise on the in- crease. Whether the PET sheet is used for transparent packag- ing for food (trays or tubs for fruit, vegetables, meat, cookies etc.) or for non-food (such as blister packaging) it is always important to take account of the particular properties of PET and it is exactly this which Gneuss has done. With the Multi Rotation System (MRS) Extruder, Gneuss has de- veloped the only extruder specifically designed not only with thematerial PET inmind, but with the reprocessing of PET. With theMRS extruder Gneuss offers a processing unit which enables PET to be extruded cost effectively, without any pre-drying or crystallisation. This applies both to the processing of both virgin and post- consumer bottle flake with a residual moisture level of 1 % and in some cases more. The extruder will also easily handle PET / PE scrap (laminated sheet) andmixtures of PET and PETG. Thanks to the extremely high polymer surface exchange rate under vacuum in theMRS section, a vacuum level of only 25 bar is required in order to achieve 100 % moisture extraction. Another effect of the extremely high polymer surface area ex- change rate under vacuum is the excellent extraction of vola- tile contaminants. The system achieves the requirements of the FDA, EFSA and Invima without restrictions. PET sheet made on the MRS extruder is therefore suitable for food contact applica- tionswhatever inputmaterial is used andwithout any pre-treat- ment of the input material. The Gneuss Processing Unit includes also the unique Gneuss Rotary Melt Filtration System for the efficient removal of solid contaminants with fine filter elements even on post-consum- er bottle flake. The Gneuss Online Viscometer ensures a con- sistent, defined IV value of the polymer thanks to the intelli- gent control system and is an extremely useful tool for quality monitoring and control. Gneuss Kunststofftechnik GmbH www.gneuss.de Fig. 2: Gneuss Thermoforming Sheet Line