Ettlinger, a German manufacturer of melt filters, has introduced the ERF350, which is said to set new benchmarks in the filtration of contaminated polymer feedstock.

Suitable for processing polyolefins, polystyrenes and numerous engineering plastics such as styrene copolymers, the technology removes foreign materials such as paper, aluminium, wood, elastomers or polymer composites.

Depending on the type and level of contamination required, the ERF350 achieves a maximum throughput of 4,000kg/h in combination with the same low melt losses, which is a step up from the existing ERF250 with its maximum throughput of 3,000kg/h.

Volker Neuber, Ettlinger’s managing director, said: “Recycling plants benefit from this technology as they strengthen their competitiveness in terms of costs and performance. Companies processing large quantities also benefit, for instance, compounders where PP is converted, or manufacturers of LPDE packaging films.”

A rotating, perforated drum enables a continuous flow of melt. Screen sizes range from 80- to 1,300-microns. A scraper removes the contaminants that are held back on the surface.

Advantages include the constant melt pressure at the filter outlet leading to more reliable processing, low melt losses and good mixing and homogenising of the melts.

More information from Ettlinger Kunststoffmaschinen GmbH, Messerschmittring 49, D-86343 Königsbrunn, Germany. Tel: 49 8231 34908-0. Email: Web: