MACHINERY | MELT FILTERS
PET lumps from petro- chemical waste or from strapping production, waste fibres and PET straps.” In the first project, the RAS filter is used as the first in two filtration steps where the applied filtration is 150 or
120 microns using a laser screen and achieves an output performance of 2,000 kg/h. In the second project, the RAS
filter is the only filtration step in the application, where the applied filtration is 80 microns on a laser screen and achieves an output performance of 700 kg/h. Effective filtration maintains the high throughput even when the intrinsic value (IV) levels on the infeed
Above: Fimic says its RAS filter is suitable for food
contact and non-food contact PET recycling
material are different and inconsistent, the com- pany says. The RAS filter system, which is Fimic’s flagship
filtration product for recycled materials, is de- signed to handle high contaminant levels in post-consumer and post-industrial waste. It is designed with a rotating two-blade scraper that traps the contamination that collects on the filter then automatically discharges what it has collected via an adjustable discharge valve. A touchscreen controller allows the user to set the pressure level as a start point signal to activate the scraper. The speed adjustable scraper can also be set to run continuously in the case of large amounts of contamination. Fimic offers the RAS filter as a laser screen, punched screen or mesh screen design. It can be designed for specific requirements, such as the type of plastic material to be filtered, produc- tion rate, filtration level required and type of contamination.
Right: Ettlinger’s ECO 1000 melt filter provides throughputs up to 10,000 kg/h
Lifting capacity At last year’s K show, Maag Group company Ettlinger, a designer and maker of high-performance continu- ous melt filtration systems, informally introduced the newest and largest model in its ECO series of filtration technology, which is developed for PET and PA recycling. The new ECO 1000 model can achieve throughput rates up to 10,000 kg/h depending on the filter fineness, which can be from
74 COMPOUNDING WORLD | June 2023
60 to 1,800 microns. The unit joins the ECO 200, the ECO 350, and the ECO 500, which handle throughputs of up 1,200, 2,500 or 4,000 kg/h respectively. The ECO series is designed as a self-cleaning melt filter technology where a scraper removes solid or elastomeric particles that are deposited on the outer surface of a rotating, perforated steel drum as the melt continuously flows from the outside to the inside of the drum. Laser-drilled conical holes in the steel screen are designed for the melt to pass through, leaving the contamina- tion on the drum surface. The scraper continuously removes the contaminants, which are fed to a discharge system. The melt filter system is de- signed to maximise contaminant removal while minimising melt loss. Ettlinger also offers its ERF series of high-perfor- mance melt filtration systems, which are designed to process a wide range of polymers, including LDPE, LLDPE, HDPE, PP, PS, ABS, PC/ABS, TPE, TPU and POM. The ERF series can handle materials with up to 16% by weight contamination and are offered in four sizes with throughput rates ranging from 150 kg/h to 10,000 kg/h. Maag expanded its business vertically with the acquisition late last year of Witte Pumps & Technol- ogy, a Tornesch, Germany-based supplier of gear pumps and aftermarket parts and services for the chemical, plastic, and polymer processing indus- tries. Maag will combine its gear pump business with the newly acquired Witte Pumps business; the former owner of Witte Pumps & Technology, Dr Sven Wieczorek, will lead the new integrated business unit under Maag’s ownership. The most recent addition to the Nordson
product line is a melt filter for blown film applica- tions that handles high contents of recycled materials. Also launched at last year’s K show, the new BKG HiCon K-SWE-HD/RS melt filter is based on the company’s backflush technology and enables the use of contaminated recycled material while keeping the blown film process stable and the end product quality high, according to Christian Schroeder, Global Segment Manager for the recycling market at Nordson. Producing quality blown
film is not an easy task, according to Schroeder, as the film bubble reacts sensitively to changing process condi-
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IMAGE: FIMIC
IMAGE: MAAG GROUP
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