An innovative route to circular rigid plastics

Yuri van Engelshoven, Pingping Wen, Maarten Bakker, Ruud Balkenende, Peter Rem*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
77 Downloads (Pure)

Abstract

An innovative route for plastics recycling is proposed, based on a combination of a logarithmic sorting process and colour plus high-resolution near-infrared (NIR) sensors. Although counterintuitive, it is shown that such a technology could sort clean flakes from rigid packaging waste into a very large number of different plastic grades with modest sorter capacity, provided that the chosen sensor is able to differentiate correctly between any two grades of plastics in the waste. Tests with high-resolution NIR on single pixels of transparent flakes from different types and brands of packaging show that this is indeed the case for a selection of 20 different packaging items bought from shops. Moreover, the results seem to indicate, in line with previous research, that high-resolution NIR data can be linked to important physical plastic properties like the melt flow viscosity and tensile strength. The attraction of deep sorting of waste plastics with relatively cheap sensors and modest sorter capacity is that the present industrial practice of tuning plastic grades to specific applications could coexist with commercial high-grade recycling at high levels of circularity and low carbon footprint. Therefore, advanced recycling technology is likely to be a societal alternative to phasing out plastics for rigid applications.

Original languageEnglish
Article number6284
Number of pages24
JournalSustainability
Volume11
Issue number22
DOIs
Publication statusPublished - 2019

Keywords

  • Circularity
  • NIR
  • Plastics
  • Recycling
  • Sensor sorting

Fingerprint

Dive into the research topics of 'An innovative route to circular rigid plastics'. Together they form a unique fingerprint.

Cite this