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3 May 2010 Detecting and discriminating PE and PP polymers for plastics recycling using NIR imaging spectroscopy
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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.
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Martin De Biasio, Thomas Arnold, Gerald McGunnigle, Raimund Leitner, Dirk Balthasar, and Volker Rehrmann "Detecting and discriminating PE and PP polymers for plastics recycling using NIR imaging spectroscopy", Proc. SPIE 7661, Thermosense XXXII, 76610V (3 May 2010);

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