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The MRSjump extrusion process is based on Gneuss’ MRS (Multi-Rotation-System) extrusion principle. The MRS extruder is an advancement of a simple single screw extruder, equipped with a multi screw section for optimum devolatilization. The unique MRS technology enables extremely efficient and gentle decontamination of PET, without the need for pre-drying whilst achieving the required decontamination for food contact standards.
What is new about the MRSjump is the longer, modified version of the Multi Rotation Section which ensures both a longer residence time of the material and surface area exchange under vacuum. At the same time, material shearing has been reduced. As the thermal and mechanical stress on the polymer melt is minimised, PET processed on the MRSjump extruder has excellent optical and mechanical properties.
The longer Multi Rotation Section, coupled with a powerful vacuum system with 1 mbar can be used to boost the viscosity of R-PET and to hold it at a stable level in spite of variations in the input material. In this way, there is no need for any liquid phase (LSP) or solid state polymerisation (SSP) for many applications.
With the stabilisation and/or increase of the intrinsic viscosity in the extrusion process, the MRSjump is especially well suited to recycling for example reground PET film waste or fiber recycling – cases in which direct recycling with an extruder was previously impossible due to the too low intrinsic viscosity or variable input viscosities.
Advantages of the MRSjump extruder