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Open AccessArticle

An Innovative Route to Circular Rigid Plastics

1
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
2
Faculty of Industrial Design Engineering, Delft University of Technology, Landbergstraat 15, 2628 CE Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Sustainability 2019, 11(22), 6284; https://doi.org/10.3390/su11226284
Received: 27 August 2019 / Revised: 1 November 2019 / Accepted: 1 November 2019 / Published: 8 November 2019
(This article belongs to the Collection Trends in Municipal Solid Waste Management)
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. View Full-Text
Keywords: circularity; plastics; recycling; sensor sorting; NIR circularity; plastics; recycling; sensor sorting; NIR
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MDPI and ACS Style

van Engelshoven, Y.; Wen, P.; Bakker, M.; Balkenende, R.; Rem, P. An Innovative Route to Circular Rigid Plastics. Sustainability 2019, 11, 6284.

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