Königsbrunn, Germany-based Ettlinger Kunststoffmaschinen GmbH is now offering the ERF350 filter for what it calls “contaminated polymer feedstock.” The company indicates the new model is the first in what will be a “performance-enhanced generation of the ERF series suitable for processing all standard polyolefins and polystyrenes as well as numerous engineering plastics.”
Among the engineering resins the ERF350 can handle, according to Ettlinger, are styrene copolymers, thermoplastic elastomers (TPEs) and thermoplastic polyurethane (TPU). The filter is capable of removing foreign particles such as paper, aluminum, wood elastomers or high-melting polymer composites containing up to 18 percent contaminants, according to Ettlinger.
Depending on the type and level of contamination in the material to be cleaned and the selected screen size, the ERF350 can obtain a maximum throughput of 3,800 kilograms (8,375 pounds) per hour in combination with what Ettlinger calls “ultra-low melt losses.”
“Users of our new ERF350 melt filter very soon realize that their investment pays for itself in minimal time owing to the clearly superior performance,” says Volker Neuber, Ettlinger’s managing director. “It’s a highly efficient way for recycling plants to strengthen their competitiveness in terms of costs and performance in what is a fiercely contested market constrained by price tags. Companies [that] process large quantities will particularly profit from the new technology. Compounders where PP (polypropylene) is converted for use in the automotive sector or manufacturers of, say, LPDE (low-density polyethylene) packaging films, are only two examples.”
The EFR350’s capacity has been confirmed during “the first few months of practical duty with pilot customers,” according to Ettlinger. The firm also contends users will “profit from more productivity when recycling contaminated waste plastics from industrial or consumer sources [and] energy consumption is about as low as that of the (earlier introduced model) ERF250 despite the far better efficiency.”
The company also calls the ERF350 self-cleaning. It works with a rotating, perforated drum, through which there is a continuous flow of melt material from the outside to the inside. Screen sizes offered range from 80 micrometers (.003 inches) to 1,300 micrometers (.05 inches). A scraper has been designed to continuously remove contaminants that are held back on the surface and feeds them to an exit screw or discharge shaft.
Ettlinger Kunststoffmaschinen GmbH was founded in Germany in 1983 and in 2013 opened a sales and service subsidiary in Atlanta. The company focuses on the development and manufacture of injection molding machines and melt filters, including filters designed for the continuous filtration of feedstock with contaminants such as paper, aluminum, wood, silicone or high-melt-temperature polymer composites. Ettlinger’s injection molding machines are targeted toward the production of polymer moldings up to 100 kilograms (220 pounds) in weight, such as plastic pallets, fittings or manholes.