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Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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Two Layer Sheets for Processing Post-Consumer Materials.

Lisa-Maria Wittmann1, Dietmar Drummer1

  • 1Department of Mechanical Engineering, Institute of Polymer Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Am Weichselgarten 10, 91058 Erlangen, Germany.

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Summary
This summary is machine-generated.

Multilayer extrusion improves the processing of post-consumer recycled (PCR) materials by enhancing extrudability and surface quality. This method effectively manages viscosity and particle issues inherent in PCR, making it a viable option for sustainable polymer processing.

Keywords:
extrusionmultilayer sheetpost-consumer material

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Area of Science:

  • Polymer Technology
  • Materials Science
  • Sustainable Manufacturing

Background:

  • Increasing demand for post-consumer materials (PCR) driven by resource scarcity and policy.
  • Challenges in processing PCR, particularly low viscosity and particle presence, negatively impact extrusion.
  • Need for improved methods to ensure extrudability and surface quality of recycled polymers.

Purpose of the Study:

  • To investigate the effectiveness of multilayer sheets in improving the extrudability and surface quality of post-consumer materials (PCR).
  • To analyze the influence of viscosity and particle content on both monolayer and multilayer sheet quality.
  • To demonstrate the potential of multilayer extrusion for processing PCR materials.

Main Methods:

  • Processing of virgin and PCR materials with varying melt flow rates (MFR) as monolayers and two-layer sheets.
  • Rheological investigations to assess material flow properties.
  • Optical analysis and film thickness distribution measurements to evaluate sheet quality.

Main Results:

  • Multilayer sheet extrusion significantly improves extrudability compared to monolayers.
  • Surface quality of sheets is enhanced through the use of multilayer structures.
  • The study establishes a clear relationship between matrix viscosity, particle presence, and overall sheet quality.

Conclusions:

  • Multilayer extrusion offers a viable solution for overcoming processing challenges associated with post-consumer recycled (PCR) materials.
  • This technique enhances both the processability and the final product quality of recycled polymers.
  • Multilayer sheets present significant potential for increasing the utilization of PCR in polymer applications.