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Fast Identification of Plastic Materials by Near-Infrared Spectroscopy

Schnelle Identifizierung von Kunststoffen durch Nah-Infrarrot-Spektroskopie
: Eisenreich, N.; Kull, H.; Thinnes, E.

Krause, H.H.; Penninger, J.M.L.:
Conversion of Polymer Wastes and Energetics
Toronto-Scarborough: ChemTec Publishing, 1994
ISBN: 1-895198-06-2
Book Article
Fraunhofer ICT ()
AOTF; identification; near-infrared spectroscopy; plastics; polymers; recycling; thermal disposal

The recycling or the thermal disposal of plastics is only possible after a rigorous process of separation into classes of compatible materials is conducted. An automatic sorting process leads to recyclates which can be re-used in an economic way. Unknown plastic materials such as basic polymers, fillers and some critical additives, e.g., fire retardants, must be identified. Near-infrared spectroscopy (NIRS) allows the identification of basic polymer, because absorption or reflectance spectra deliver 'finger prints` of polymers and also provide an additional information on some additives. A NIR-spectrometer based on an acousto-optic tunable filter scans the spectral range required for identification, in milliseconds. A transputer system controls the spectrometer, acquires and analyzes the spectra on-line. The integration into a separation process has been done.