In order that the filter elements do not need to be constantly changed by hand, the ideal Melt Filtration System should be self-cleaning. Typically, the principle of back flushing is used. A proportion of the melt flow is diverted so that it flows in the reverse direction across filter elements which are not in use in order to wash the contamination out. The cleaning efficiency of the back-flushing and the quantity of material needed for back flushing vary greatly between the different systems available on the market.
With the Gneuss RSFgenius Melt Filtration System, the high pressure sequential cleaning system ensures that the filter elements are completely cleaned with the absolute minimum of polymer.
Nosoplas in Spain decided in favour of the RSFgenius Rotary Filtration System due to the high efficiency and the fast return on investment which it offers. Nosoplas manufactures bottle grade pellets (chip) from PET bottle flake. The pellets (chip) are supplied to other companies, where they are injection moulded to pre-forms which are later blown into high quality bottles for beverages.
Nosoplas decided to replace their existing, conventional filtration system due to problems with back flushing and high polymer losses. They replaced this conventional system with a Gneuss RSFgenius 175 for a throughput of 1.500 kg/h and a filtration fineness of 56 µm. In fact, the customer is even able to operate with 30 µm for special products. And this all with a constant, steady melt pressure, minimal losses due to back flushing and without any production variations, even during replacement of the filter elements.