Gneuss: New recycling system for post-consume...

New recycling system for post-consumer PET fiber waste

(Source: Gneuss)
(Source: Gneuss)

The Omniboost Recycling System is designed for recycling both post-industrial and post-consumer polyester (PET) waste with a low bulk density, such as waste fibers, or thin film. Without the need for any thermal pre-treatment, the material is fed into the 3C Rotary Feeder, which cuts and compacts the material as well as feeding it directly into the MRS Extruder screw.
Able to process fiber waste with a residual moisture level of 6% and an intrinsic viscosity of 0.64 dl/g, Gneuss has introduced the new Omniboost Recycling System for processing PET industrial fiber waste (POY). The material is fed into the Omniboost system with at throughput rate of 150 kg/h and thanks to the liquid melt phase IV booster, the viscosity was increased. With a residence time within minutes, the IV is increased to 0.66. For an IV boost to 0.84 a residence time less than half an hour is required.
The Gneuss Multi Rotation Section (MRS) extruder is based on the simple and rugged single screw extruder, however it is equipped with a multiple screw section for optimized degassing. The patented multiple screw design from Gneuss Kunststofftechnik GmbH, Bad Oeynhausen/Germany, has a section of extruder screw (MRS) with a number of satellite screws, which rotate in the opposite direction to the main screw, creating a huge surface area and ensuring an extremely rapid surface area exchange rate. This ensures very good degassing performance in the melt phase, with minimal stress on the material and can decontaminate post-consumer PET to food contact requirements without the need for thermal pre-treatment of the material prior to extrusion.
After passing through the extruder, the polymer melt is filtered with the highly efficient RSFgenius Melt Filtration System. This system ensures that even with high contamination loads, fine filtration is possible without pressure or flow disturbances and with minimized polymer loss.
Still in the melt phase, the polymer flows into the Gneuss Jump liquid phase IV booster reactor. The viscosity of the melt is measured both on the inlet and outlet of the reactor. The viscosity is boosted to the required level by regulating the vacuum level, residence time and surface area exchange rate in the reactor vessel. With an assured, constant output viscosity the material can be fed to the production process (e.g. fiber spinning, strapping tape) whilst still in the melt phase. By ensuring that the polymer remains in the melt phase from the extruder to the final processing stage, the Omniboost recycling process represents a fast and efficient way to reprocess PET where a viscosity boost is required.

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