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11-24-2020

Closing the Loop for PET Trays

Unique PET Tray-to-Tray Recycling in a Single Extrusion Step

The availability of PET bottle flake outside the beverage sector is expected to decline continuously in the coming years. Tray-to-tray recycling can close this gap and succeeds particularly easily with a new extruder.

  • MRS extruder screw with multi-rotation section for efficient degassing and decontamination © Gneuss

    MRS extruder screw with multi-rotation section for efficient degassing and decontamination © Gneuss

  • Tray-to-Tray Film Recycling Line with the MRSjump Extruder © Gneuss

    Tray-to-Tray Film Recycling Line with the MRSjump Extruder © Gneuss

  • In contrast to PET bottle flake, the origin of post-consumer PET trays is not so well controlled, which is why the quality and properties of the flake vary considerably © Gneuss

    In contrast to PET bottle flake, the origin of post-consumer PET trays is not so well controlled, which is why the quality and properties of the flake vary considerably © Gneuss

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The recycling of regrind from post-consumer PET trays to new sheet for PET trays presents challenges for the recycling process:

  • Unlike PET bottle flake, the intrinsic viscosity of the regrind from PET trays is too low to permit direct recycling on a conventional sheet extrusion line.
  • The sources of post-consumer PET trays is not as controlled as with PET bottle flake and there is a wide range of different types of trays in circulation, therefore the quality and property of the regrind varies considerably.
  • It is unavoidable, that tray regrind will be cross – contaminated with other polymers, as it is difficult to completely exclude other polymers, especially due to co-extruded or laminated layers.
  • For food contact applications, efficient decontamination of the polymer (e.g. EFSA, FDA) for monofilm structures is extremely important.
  • The material must be efficiently purified but at the same time, the processing should be as gentle as possible if the material is to be processed in a continuous closed loop and if the product quality is to be guaranteed.

Extruder with High Decontamination Capacity

For this demanding process of tray-to-tray recycling, Gneuss has developed the innovative MRSjump Extruder. The new MRSjump Extruder combines the high decontamination performance of the MRS degassing extruder, which has been well established over the past decades, with a viscosity boost:

  • he MRSjump extrusion process does not necessitate any pre- or post-treatment of the input material, such as crystallisation or pre-drying of the recycled material or an IV boost in a solid state polycondensation (SSP).
  • The high degassing efficiency of the MRSjump Extruder makes it possible to comply with EFSA and FDA limits without time- and cost-intensive upstream or downstream material treatment.
  • The simple set-up of the MRSjump direct extrusion process avoids the combination of different material treatments prior or subsequent to extrusion and resulting interface problems.
  • Thanks to the short process chain, the melt remains within a narrow, defined residence time spectrum. The thermal and mechanical stress on the material is kept low. This results in excellent mechanical and optical sheet properties.
  • The compact design of the MRSjump Extrusion System means that it has a small footprint and compared with other concepts available on the market, it can easily be retrofitted to an existing sheet line within the same spare requirements as an existing conventional extruder.
  • The MRSjump Extruder can processes a wide range of input materials, from regrind from mono- and multi-layer trays to material combinations which would stick together in a conventional thermal pre-treatment process (e.g. sheet regrind from PET/PE, GAG, certain copolymers).
  • In combination with the Gneuss Rotary Filtration Technology, a high melt purity is guaranteed.
  • Quality assurance is also provided by optional systems for measuring melt viscosity and optical properties (colour and transparency measurement).

With the innovative MRSjump Extruder Gneuss offers an optimum solution for post-consumer tray-to-tray recycling, which meets all requirements of completely circular modern food packaging.

Recycling and decontamination are for the first time made possible with the MRSjump Extruder, within one single extrusion step without upstream or downstream material treatment steps. This opens up new possibilities for the recycling of tray regrind.

Additional information
  • Published in Kunststoffe international 2019/09

    New Filter and Revamped MRS Target Cost Efficiency

    Gneuss at K 2019

    Gneuss has different models of its patented rotary filtration systems. In extrusion technology, Gneuss is presenting the second generation of its multi-rotation system (MRS).   more

    Gneuß Kunststofftechnik GmbH

Company profile

Gneuß Kunststofftechnik GmbH

Mönichhusen 42
DE 32549 Bad Oeynhausen
Tel.: 05731 5307-0
Fax: 05731 5307-77

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