Influence of reflective materials, emitter intensity and foil thickness on the variability of near-infrared spectra of 2D plastic packaging materials

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Externe Organisationseinheiten

  • Polymer Competence Center Leoben GmbH


Most two-dimensional plastic packaging materials are thermally recovered, which does not add to the recycling
quota of 50 % required by EU legislation for all lightweight packaging until 2025. Furthermore, the separation processes for 2D materials cannot reach the same level of accuracy, which is possible in the sorting of rigid plastic
This study proposes new adaptations to existing sorting aggregates to increase the near-infrared spectral quality of two-dimensional materials. It aims to improve the spectral quality, which was defined by the deviation of the spectra from a reference spectrum and the variability of the recorded spectra, which can be achieved by installing reflectors behind the material made up of copper or aluminium. This setup enables detection in transflection rather than reflection mode.
The variability could be reduced by a factor of 6 through the use of a reflective background. Meanwhile, the
spectral fidelity to the reference spectrum could be enhanced, in some cases decreasing the deviation from the reference spectrum by 30 %, which means enhancing a spectrum from unrecognisable to useable. Apart from
using reflective materials, the effects of emitter intensity, material and thickness were evaluated.


Titel in ÜbersetzungEinfluss von Schurrenmaterial, Emitterintensität und Folienstärke auf die Qualität der Nahinfrarotspektren von 2D Kunststoffverpackungsmaterial
Seiten (von - bis)543-551
FachzeitschriftWaste management
Ausgabenummer1 May
StatusElektronische Veröffentlichung vor Drucklegung. - 1 Apr 2022