MELT FILTRATION | PROCESSING


Built for hard vinyl Polymer Systems Inc (PSI) introduced a new screen changer and a new melt pump at NPE developed specifically for processing hard vinyl. Both are PSI’s first products of their type for use with this material type. “PVC is a particularly challenging material to work with due to its narrow process window and a need for a constant, steady flow, which keeps many processers of rPVC from using screen changers or gear pumps at all,” says the company. “The new products eliminate the usual concerns processors have about including screen changers and gear pumps in their process.” PSI’s Expansion Plate Screen Changer (ESC)


tolerates temperature swings of more than 8°C. “We solved the chemistry issues relative to heat, flow, and thermal conductivity that make the use of a screen changer with PVC formulations so challeng- ing,” says Don Macnamara, General Manager at PSI. The screen changer requires only a momentary shut down for a screen change, which PSI says eliminates the need for disassembling the die and the high scrap rates that result from that, especially on short runs. “The screen change process itself is expertly engineered as well, with PLC control of expansion spacer bars that separate the body halves from the slide plate between them,” the company claims. Once the spent screen has been replaced, the spacer bars contract, bringing the steel body halves back tightly against the slide plate, recreating a seal through direct steel-on-steel contact. The ESC comes standard with corrosion-resist- ant stainless-steel components, straight-through chrome plated flow bores to reduce surface friction and eliminate hang-up areas, and identical interchangeable and field repairable upstream and downstream bodies for easy repair or replacement. ADG Solutions has a new model in its CFO line of continuous melt filtration systems, the CFO 25. This has a diameter of 25-inches (635mm), allowing throughputs of up to 3,400 kg/h. Aimed squarely at the US market, the CFO 25 has completely imperial sizing. Replacing an existing 24-inch (600mm) model, it is claimed to be fully leak-proof, with the robust design tolerating pressures of up to 3,500 psi. The CFO unit is fully automatic: when waste builds up and back pressure reaches


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a pre-set level, a rotating blade sweeps the screen and removes the contamination through a discharge port. The filter can handle a broad range of materials including PE, PP, PS, PC, and ABS. The design will function with up to 10% paper and other foreign objects up to just under 20 mm in diameter.


Advancements now available


across the complete CFO line include a new scraper design that has been refined for smaller purges. This is said to improve efficiency and cover a broader range of applications. The screen


plate filter has also been redesigned and is


now thicker, harder and presents more uniform hole quality. Later this year, a new diamond-hard plate surface will be available for processing aggressive and abrasive materials. ADG says this will offer a screen life extension of 2-3 times longer than the existing design.


From PO to PET... Erema has been offering its Laserfilter for use in polyolefin recycling systems for more than 20 years. Last year, it launched a modified Laserfilter for PET systems, as well. Robert Obermayr, Head of Erema’s Powerfil Business Unit says it has already sold a number of models in the inline sheet, strapping and pelletising sectors. “The convincing arguments definitely include the smooth handling of PET melts with high degrees of contamination which can also be over one per cent, stable pressure consistency and particularly long screen service life,” he says. “Another benefit of the Laserfilter is that the flow-oriented


Left: Screenchanger manufacturers are working hard to improve performance of their equip- ment. This PSI design is


optimised for the challenge of rigid PVC processing


January/February 2019 | PIPE & PROFILE EXTRUSION 37


Left: Ettlinger says its new ERF350 melt filter provides almost 30% higher throughput than its predecessor, the ERF250


PHOTO: ETTLINGER


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