Sheet extrusion lines based around the Gneuss Processing Unit (GPU) are in operation worldwide in the manufacture of PET sheet for thermoforming. The applications range from monolayer sheet from 100 % post consumer bottle flake for food contact applications to liquid coated and laminated sheet.

Technical options:

  • Gravimetric multiple component dosing feeders
  • Coextrusion (MRS, single screw extruder)
  • Foam sheet
  • Sheet lamination
  • Coating for antiblock /antistatic
  • Thickness measurement with optional automatic die lip adjustment of the sheet die
  • Sheet quality monitoring system
  • Stress Analyser

Typical applications are throughput rates from 350 kg/h to 2.000 kg/h, sheet widths of up to 2.000 mm and sheet thicknesses between 0,15 and 1,2 mm. In addition to PET bottle flake and virgin material (pellets), edge trim and skeletal waste regrind from PET, GAG and PET sheet with PE lamination are often added. Due to the especially gentle direct processing without pre-drying, crystallising or frictional heat, materials with widely different melting points can be processed directly.

Advantages of the Gneuss thermoforming sheet lines:

  • High transparency and gloss, low yellowness
  • High toughness and impact resistance, low brittleness
  • Very good thermoformability due to excellent molecular distribution
  • Letter of Non Objection (LNO) from the FDA for up to 100 % recycled content, EFSA conformity for direct food contact for both monolayer and co-extruded sheet
  • Processing of polymers with low melting points such as PETG and PE together with regrind from 2 ply sheet PET/PETG and laminated PET/PE sheet
  • Quick material changes, high flexibility
  • Major energy savings, low space requirements, simple maintenance