melt filtration | Technology


RAS and REF products are self-cleaning melt filters with a backflush option, which the company claims are the most cost-effective filters of their type in the market. They have filtration levels from 100 to 2,000 microns, and the filtration area also ranges widely from 779 to 3,796 cm². The wide filtering surface means they can operate at lower pressures. Screen changing times are 30 mins. Fimic’s ERA product is a double filter system which


Above: Filter testing in Fimic’s lab


The SFXmagnus is a range of automatic screen


changers which have large active screen areas in a compact unit. The SFXmagnus 150, for example, has an active area of 600 cm², but its body’s largest dimension is 1,300 mm. The range can be specified with or without an integrated back-flushing piston. Both the RSFgenius and the SFXmagnus ranges


were revised by Gneuss during 2016. The company says: “Modifications to the screen changer housings permit operation on a wider range of applications at higher pressures, whilst offering enlarged active filtration areas.”


Common components and modules are now used in


the two ranges. This makes them “more attractive value for money” and enables shorter delivery lead times, according to the company. Gneuss also showed the new SFpvc R, a further


Right:


Ettlinger’s ERF 250 melt filter


development of the SFpvc filtration systems launched in 2013. SFpvc systems have a streamlined melt channel design and short flow paths for gentle processing of difficult PVC waste materials. The SFpvc R launched at K 2016 offers for the first time an integrated self-clean- ing (back flushing) system whilst maintaining absolute process- constant operation. Completing the Gneuss line-up of melt filters is the KF range, represented at K 2016 by a KF 75. The compact KF range is designed specifically for applications with frequent material type, grade or colour changes. Fimic concentrates almost entirely on melt filtration technology, as shown in its product range. Its established


30 PLASTICS RECYCLING WORLD | June 2017


allows two levels of fineness with a single screen changer. The system has two filtration chambers and two independent discharge valves. Filtration options range from 100 to 2,000 microns, with filter areas available in 1,912, 2,776 and 3,796 cm². The company says ERA filters have the flexibility to work with any type of contamination and provide savings in energy use and investment in the extrusion line. Screen changes take a maximum of 60 minutes. NET filters are Fimic’s most recent development, which it says are easy for recyclers to use due to their automatic and continuous operation not reducing the extruder’s output. The operator does not need to be present continuously at the filter. Filtration is as fine as 80 microns and can go up to 2,000 microns. Filter area is 1,465 cm². The versatility of Fimic’s filters was highlighted in January when the company installed a total of five custom-designed systems in five different countries. The five lines are handling different material streams: LDPE post-consumer; LDPE post-industrial; LDPE post-industrial and post-consumer mixed; PP post- consumer big bags; and HDPE and PS unwashed post-industrial. One of the projects was in the US for an existing


Fimic customer handling 2,800 kg/h of post-consumer LDPE with around 8% cardboard content. This is the recycler’s second Fimic line which is designed for recycling LDPE packaging waste into profiles containing recyclate. Fimic said it provides a throughput of approximately 1,500 kg/h thanks to the use of a Fimic RAS600 melt filter with 600 micron punched screen, which was


customised with some optional special accessories. The requirements of this North American profile application did not require fine filtration, so the


customer is using Fimic punched screens. The other four filters installed by the company during January use laser filtration (100-250


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