This fiber waste had a residual moisture level of 6 % and an intrinsic viscosity of 0,64 dl/g. This material was fed into the OMNIboost system with at throughput rate of 150 kg/h and thanks to the Gneuss liquid melt phase IV booster, the viscosity was increased. The visitors were impressed by the speed of the IV boost: with a residence time within minutes, the IV was increased to 0,66. For an IV boost to 0,84 a residence time less then half an hour was required.
The OMNIboost Recycling System is designed for recycling both post-industrial and post-consumer 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 Gneuss 3C Rotary Feeder, which cuts and compacts the material as well as feeding it directly into the MRS Extruder screw.
The Gneuss MRS extruder is based on the simple and rugged single screw extruder, however it is equipped with a multiple screw section for optimised degassing. The patented multiple screw design from Gneuss has a section of extruder screw (Multi Rotation Section 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 unparalleled 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.