TECHNOLOGY | MELT FILTRATION
Right: The BritAS ABMF 1600
permits processing of plastics waste with a higher degree of contamination, for example paper. The melt filter also has increased motor capacity for belt take-off and the belt magazine. BritAS filters are used in the post-consumer sector and for agricultural film waste, but also for post-industrial waste and by compounders. ADG Solutions has made
improvements to the CFO line of continuous melt filtration systems and introduced a new model – the CFO 25. The company says that new advancements are now available on the complete CFO line to improve
the overall performance of these systems. These include a new scraper design that has been refined for smaller purges. This design improves efficiency and covers a broader range of applications. The corresponding computer program controls has been updated to allow the amount of scrapes in-between purging to be variable, so the user can maximise contamination collection. The screen plate filter has also been redesigned to be thicker, harder and with more uniform hole quality. A new diamond hard plate surface is also available for aggressive and abrasive processes. This design will offer a significantly longer screen life by two to three times over the existing one. US-based ADG says the new CFO 25 offers over
a 10% larger screen surface area and sizing that is completely imperial – replacing the existing 600 mm model. The cover includes 360 degrees of studs, which seals the surface and prevents any leaks. This design tolerates much higher pressures of up to 3,500 psi.
The company adds that the CFO
(Continuous Filter Operation) system makes uninterrupted extrusion possible, even when processing highly contaminated materials. The company says that unlike conventional screen changers, which require extensive and constant operator attention, the CFO can operate automatically with minimal operator attention during a shift. As extruded material enters the unit, it passes through a stainless-steel screen
plate that is micro drilled and hard faced, filtering contaminants that
are caught on the screen-plate surface. When waste builds up and
back pressure reaches a pre-set level, a
rotating blade sweeps the screen and removes the contamination through a discharge port. There are now three CFO models. The CFO 15
has a throughput of 800-1,800 lbs/h, with the CFO 20 capable of 1,200-4,000 lbs/h. The new CFO 25 has a diameter of 25 inches and a throughput of 3,000-7,500 lbs/h. The CFO handles a broad range of materials including PE, PP, PS, PC and ABS. The filter can handle up to 10% paper and other contaminants up to 0.75 inches in diameter. Contaminants such as metal, wood, paper, textile fibres, un-melted plastic granules, and a smaller percentage of aluminium, lead, copper, rocks and other impurities are readily tolerated. Nordson has developed the BKG FlexDisc to
provide producers of critical films and PET recy- clers with more filtration area than standard screens, without an increase in machine size. The company says that the FlexDisc filter for piston- activated screen changers substantially enlarges available filtration area without the need to increase machine size, enabling processors and recyclers to achieve finer filtration, higher through- puts, longer filter service life, and reduced specific backflush volume. Nordson recommends the BKG FlexDisc for increasing productivity and enhancing quality in bottle-to-bottle PET recycling, PET fibre recycling and battery separator film applications. The function of the hydraulic pistons, with which
Left: The new CFO 25 from ADG Solutions
24 PLASTICS RECYCLING WORLD | March/April 2019
many BKG screen changers are equipped, is to insert screen cavities into the melt stream for filtration and to remove them for cleaning or replacement. In systems where FlexDiscs are used, each cavity contains a filter stack comprised of two to four FlexDiscs, depending on machine size. Each FlexDisc is equipped with two Nordson screen
www.plasticsrecyclingworld.com
PHOTO: BRITAS
PHOTO: ADG
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