MACHINERY | MELT FILTRATION
Right: Evenly spaced
securing studs are claimed to minimise the risk of melt leakage in ADG Solutions’ CFO series
machines
harder and with a more uniform hole quality. A new diamond-hard plate surface will also be available for aggressive and abrasive processes, which will extend screen life by two to three times over the existing version.
ADG Solutions says the CFO (Continuous
Filter Operation) system makes uninterrupt- ed extrusion a reality, even when processing highly contaminated materials. It says this is because 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 dis- charge port. There are now three CFO models in the line-up.
The CFO 15 has a throughput of 800-1,800 lbs/h (363-816 kg/h) with the CFO 20 capable of 1,200- 4,000 lbs/h (544-1,814 kg/h). The new CFO 25 has a diameter of 25 inches (63.5 cm) and a throughput of 3,000-7,500 lbs/h (1,361-3,402 kg/h). The CFO design handles a broad range of materials includ- ing PE, PP, PS, PC and ABS. The filter can handle up to 10% paper and other foreign objects up to 0.75 inches (19 mm) 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 is readily tolerated.
Below: Ettlinger has added a 60 micron option to its laser- drilled ECO filter range
ADG Solutions has machines operating in a number of challenging environments. “We have new machines working in Ohio on post-commer- cial films that have been baled at MRFs (material recovery facilities),” says Guthrie. “Processes are able to work through many different types of contamination that vary greatly, without notice as
they are in bales. Performance of the filters contin- ues to work with up to 10% contamination. We have also assisted Aaron Industries in Massachu- setts to increase capacity and significantly lower operator interface.”
Laser addition Maag Group company Ettlinger has added a 60 micron option to the laser drilled screens used in its self-cleaning ECO melt filters, targeting recy- cling of PET. According to the company, the conical precision holes in the ECO filters are much more effective than traditional wire mesh screens, which due to their construction can allow particles larger than the design mesh size to pass through and can also distort at high operating pressures. In contrast, all contaminants larger than the 60 micron diam- eter laser drilled holes are retained on the surface of the rotating cylindrical screen and continuously removed by the scraper. The company says that in reprocessing of PET, the 60 micron ECO melt filters can remove even challenging contaminants such as paint particles, silicones, barrier materials, cross-linked fractions and gels. The new fine screens also allow the use of the PET fines that are created during the sorting, grinding and washing process and which are usually sold at low value.
Originally developed for highly contaminated
recycled material streams, Erema says it uses its Laserfilter screenchangers even for lightly contami- nated projects now due to its improved efficiency. “By doing this we can reduce the material losses of a typical mesh screen filter from around 1.5-2.5% to values below 0.5%, according to Robert Obermayr, Head of Business Unit Powerfil, which is Erema’s melt filtration division. “In addition, due to its background and design, the Laserfilter is a robust and reliable filter, which helps to reduce manual screen changes from one to three times for a mesh screen filter to once every three or four weeks or even up to three
34 COMPOUNDING WORLD | July 2019
www.compoundingworld.com
PHOTO: ETTLINGER
PHOTO: ADG SOLUTIONS
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