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Proceedings Paper

Detecting and discriminating PE and PP polymers for plastics recycling using NIR imaging spectroscopy
Author(s): Martin De Biasio; Thomas Arnold; Gerald McGunnigle; Raimund Leitner; Dirk Balthasar; Volker Rehrmann
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Paper Abstract

There are commercially available industrial systems for identifying and separating polymers, for instance PE from PP. However, there is a demand for analyzers that can separate within polymer classes: e.g. PE-LD from PE-HD or different polypropylenes characterised by different melting points. First, the feasibility of a reliable spectral identification was tested by extracting different PE and PP samples from an industrial recycling process, and acquiring diffuse reflectance NIR spectra using an FTIR spectrometer. The resulting spectra were then subjected to a chemometrics analysis. We successfully identified characteristic spectral features; these are determined by the chemical bonds of the material, and can be correlated to the melting points of the materials. These features were then adapted for use on a NIR hyper-spectral (HS) system, making it possible to distinguish not only different polymers, but also different types of one polymer in real-time.

Paper Details

Date Published: 3 May 2010
PDF: 8 pages
Proc. SPIE 7661, Thermosense XXXII, 76610V (3 May 2010); doi: 10.1117/12.850065
Show Author Affiliations
Martin De Biasio, Carinthian Tech Research AG (Austria)
Thomas Arnold, Carinthian Tech Research AG (Austria)
Gerald McGunnigle, Carinthian Tech Research AG (Austria)
Raimund Leitner, Carinthian Tech Research AG (Austria)
Dirk Balthasar, Titech GmbH (Germany)
Volker Rehrmann, Titech GmbH (Germany)

Published in SPIE Proceedings Vol. 7661:
Thermosense XXXII
Ralph B. Dinwiddie; Morteza Safai, Editor(s)

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