EXTRUSION: System Gives PET An IV Bump

Device is installed directly downstream of the processing unit.

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Gneuss Inc., U.S. office Matthews, N.C. will use K 2016 to take the wraps off of a system it calls Jump.  The device is installed directly downstream of the Gneuss Processing Unit, which consists of the firm’s MRS (multi-rotating system) extruder, rotary disk melt filtration systems and online viscometer. Jump is designed to provide an accurate and controllable IV boost of the PET by up to 0.3 in the melt phase. The Jump system 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.

The Gneuss MRS is designed to reprocess PET without the need for pre-drying. After the melt is filtered, a melt pump feeds it the Jump. In the device, the melt is kept under vacuum as it passes over slowly rotating elements. By controlling the residence time and the speed of the rotating elements, controlled polycondensation takes place in the Jump to increase the IV anywhere from 0.02 to 0.3 points, according to Gneuss. That means a material coming in to Jump with an IV of 0.5 dl/g can go out with an IV up to 0.8 dl/g.

The Jump system is designed to keep oxygen out so that the yellowing effect encountered during PET recycling is reduced to an absolute minimum. After the melt has passed through a stilling chamber in the Jump system, the polymer is pumped directly into the production process (for example direct extrusion spinning, strapping) or to a pelletizer. The Jump system is available for different capacities between 100 kg (220 lb) and 2000 kg (4400 lb)/hr.