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K Show Preview

Gneuss at K 2019: New Rotary Filtration System SFneos, second generation multiple screw extruder MRS and more


Gneuss Filtration Technology will exhibit several different models of their patented Rotary Filtration Systems at the K trade fair this year (Hall 9, Booth A38).

Thanks to this design, the devolatilizing performance is approx. fifty (50!) times greater than that of a conventional vented single screw extruder – and this at a vacuum of only 25 to 40 mbar. While other dryerless technologies are promoting at least partial pre-drying in the meantime, the MRS extruder can process R-PET with up to 1 % moisture content. By avoiding the need for a deep vacuum system and pre-drying, the MRS is an economically efficient alternative to conventional technologies. Further arguments in its favor besides energy savings are the simple and rugged design, small footprint, its ease of operation and low maintenance, processing flexibility and last but not least its excellent melt quality and homogeneity. A Letter of Non Objection (LNO) from the FDA, EFSA conformity and several local approvals in Latin America confirm the decontamination efficiency of this technology.

One area this has been especially successful is in PET sheet extrusion. The line at the K will be delivered to a customer in Brazil after the show to process R-PET into a packaging sheet.

In parallel, with Gneuss’ headquarters only about 200 km from the show, a complete PET sheet extrusion line with a Gneuss GPU will be running in Gneuss’ technical center open to visitors.

Polyreactor JUMP

Additionally, the previously exhibited polyreactor JUMP will be operating in Gneuss’ technical center for an online demonstration. The JUMP can lift the IV value of a PET melt up to 0,95 dl/g.

The reactor is installed directly downstream of a Gneuss Processing Unit and the polymer passes over several slow turning elements which create a polymer film, the surface of which is constantly renewed. The reactor vessel is kept under vacuum, through which volatile substances are reliably removed. By regulating the residence time in the reactor, the vacuum, the fill level and the speed of rotation of the agitating devices, the polycondensation reaction can be altered to achieve the required product properties. The JUMP is a compact, quick and efficient alternative to conventional SSP (solid state) systems and enables direct reintroduction of the polymer into the production process without the need to remelt the PET.

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