TECHNOLOGY | MELT FILTRATION
occurs in a clean and maintenance-friendly way. To cope with the high process pressures in blown film applications, Nordson made patent- pending changes to its proven backflush technol- ogy that allows for pressure to remain constant even under difficult conditions, to ensure high film quality, says Stefan Woestmann, Process Specialist. To achieve pressure consistency, each screen change is a sensitive step in the filtration process. “This is a significant issue in blown film lines since the film is usually very thin and reacts sensitively to such events,” says Woestmann. The empty cavity must be filled with melt after the screen change, but not too fast or pressure fluctuation can likely result. The BKG HiCon K SWE-HD/RS melt filter is designed with Nordson’s patented melt pressure controlled venting start approach that fully auto- mates the filling of the screen cavity after a screen change, for maximum pressure consistency. Filling is done carefully so that no air entrapment endan- gers the process or the end product. In addition, the safety cover can be opened vertically, allowing the operator to reach the filter piston from all sides which facilitates cleaning during maintenance. Powerfil, the melt filter business of Erema, has
Below: The new Erema LaserFilter (LF) 2/406 from Powerfil
released a new laser filter with 50% more screen surface area than the previous model (LF 2/354) to increase productivity and improve results in quality-intensive recycling applications. The new LaserFilter 2/406 can be used in recycling plants where throughput capacity needs to be increased while maintaining other processing parameters. The new LaserFilter handles impurity levels up to 5%. It provides filtration as fine as 70 microns while continuously cleaning the large screen with a scraper technology. Powerfil will offer the proven Erema melt filter type as individual components for existing Erema machines, and for third-party extrusion systems. Powerfil offers four models of the LF 2/406 filters, which have a scraper speed of 1-10 rpm and a maximum operating pres- sure of 320 bar. These are: the LF 2/406 with a total filter and throughput capacity of 300
area of 1,947 cm2
kg/h to 3,000 kg/h; the LF 2/406 twin with a total filter area of 3,894 cm2
of 1,200 kg/h to 5,200 kg/h; the LF 2/406 triple with a total filter area of 5,841 cm2
IMAGE: EREMA
2,700 kg/h to 6,900 kg/h; and the LF 2/406 Quattro with a total filter area of 7,788 cm2 capacity from 3,700 kg/h up to 9,000 kg/h.
48 PLASTICS RECYCLING WORLD | March/April 2023 and a throughput capacity and capacity of and
Powerfil offers both its continuous performance laser filter and its SW RTF filter with a robust, partial area backflush system, suitable for use by manufac- turers as well as recyclers because the high-perfor- mance filters can be used to process post-consum- er plastics, post-industrial films with paper labels, and clean PET material. Erema’s melt filter technologies are available in
numerous sizes and variations, depending on the required throughput level and level of contamina- tion, and can be integrated easily into an existing recycling plant. “For applications with a focus on melt quality and filtration fineness, this increase in screen area ensures lower pressure and tempera- ture at the same throughput rate, allowing even finer screen to be used for even better results in quality-intensive plastics applications,” says Robert Obermayr, Head of the Powerfil business unit.
Improving rPET Britas expanded its technology offerings with the introduction of its Automatic Belt Melt Filter (ABMF) PET-C, a new fully automatic melt filtering PET technology that features a double-cavity design for high output rates. The new model, shown to the public for the first time at last year’s K show, is equipped with Britas’ basic proven ABMF technol- ogy, such as fully automatic operation, continued production even during screen change, fine filtration level and low melt loss, along with special features and it is technically optimised. The system is applicable for post-consumer plastic waste with a focus on PET and PET-like materials, including low-viscosity plastics such as PA. It was developed to meet the growing demand and necessity for improved quality of rPET materi- als. Optimising the continuous melt flow without interruption or stoppage during change of filter screen resulted in the development of the double cavity system, the company says. The ABMF PET-C filter is available in four models with a filter area ranging from 1,140 cm2 cm2
to 3,200 . Up to three screen filters can be used at the
same time, allowing users to set the exact filter fineness, up to 20 microns, for a high level of filtration, while holding melt loss below 1%. The system delivers a maximum output up to 8,000 kg/h depending on contamination and material properties. The filter mechanism and control system work in
combination to provide fully automatic operation in double-cavity mode, resulting in no intermedi- ate storage of melt. The extruder continues to run during the screen feed, ensuring process reliabil- ity, says Britas. Use of screen belts with a Dutch
www.plasticsrecyclingworld.com
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