Identification of Shredded Plastics in milliseconds using Raman spectroscopy for recycling

Tsuchida, Akihiro; Kawazumi, Hirofumi; Kazuyoshi, Arikata; Yasuo, Tuchida

doi:10.1109/icsens.2009.5398454

Cited by 14 publications

(12 citation statements)

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“…Similar to NIR spectroscopy, Raman spectroscopy can be applied to identify polymers based on their molecular structure (Tsuchida et al, 2009). It makes use of the inelastic (Raman) scattering of monochromatic light from a laser source in the visible, NIR, or near ultraviolet range (Merrington, 2011).…”

Section: Physico-chemical and Spectroscopic Sortingmentioning

confidence: 99%

“…It makes use of the inelastic (Raman) scattering of monochromatic light from a laser source in the visible, NIR, or near ultraviolet range (Merrington, 2011). As an advantage over conventional NIR spectroscopy, H 2 O and CO 2 in the air or on the sample surface cause less negative effects and Raman spectra of polymers exhibit narrow-band peaks (Tsuchida et al, 2009). A prototype system was developed by (Tsuchida et al, 2009) which achieved an accuracy of up to 94%.…”

Section: Physico-chemical and Spectroscopic Sortingmentioning

confidence: 99%

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Automated sorting of polymer flakes: Fluorescence labeling and development of a measurement system prototype

2015

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Section: Physico-chemical and Spectroscopic Sortingmentioning

confidence: 99%

Section: Physico-chemical and Spectroscopic Sortingmentioning

confidence: 99%

Automated sorting of polymer flakes: Fluorescence labeling and development of a measurement system prototype

2015

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“…Spectroscopic methods are used either for sorting certain commodity plastics, i.e., sorting of PVC using XRF through the distinctive emission peak of chlorine in the XRF spectrum from the mixed plastic streams [ 27 ]. Similarly, in the case of RAMAN-spectroscopy, it is used for sorting multiple commodity plastics such as PP, PS, and ABS granules or flakes originating from household WEEE stream, in a high throughput setting [ 19 , 47 ]. Table 1 summarizes spectroscopic methods that either are already in use or are still in development for sensor-based sorting of plastic wastes, indicated by different TRL levels.…”

Section: Detection Techniques For Sensor-based Sortingmentioning

confidence: 99%

Evaluation of Marker Materials and Spectroscopic Methods for Tracer-Based Sorting of Plastic Wastes

et al. 2022

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Plastics are a ubiquitous material with good mechanical, chemical and thermal properties, and are used in all industrial sectors. Large quantities, widespread use, and insufficient management of plastic wastes lead to low recycling rates. The key challenge in recycling plastic waste is achieving a higher degree of homogeneity between the different polymer material streams. Modern waste sorting plants use automated sensor-based sorting systems capable to sort out commodity plastics, while many engineering plastics, such as polyoxymethylene (POM), will end up in mixed waste streams and are therefore not recycled. A novel approach to increasing recycling rates is tracer-based sorting (TBS), which uses a traceable plastic additive or marker that enables or enhances polymer type identification based on the tracer’s unique fingerprint (e.g., fluorescence). With future TBS applications in mind, we have summarized the literature and assessed TBS techniques and spectroscopic detection methods. Furthermore, a comprehensive list of potential tracer substances suitable for thermoplastics was derived from the literature. We also derived a set of criteria to select the most promising tracer candidates (3 out of 80) based on their material properties, toxicity profiles, and detectability that could be applied to enable the circularity of, for example, POM or other thermoplastics.

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“…RS applications in the analysis of plastics. The RS has been proven to be an adequate reference technique for the characterization of polymeric materials (Everall and King, 1999;Tsuchida et al, 2009) and for a combination of them found in packaging plastics. Since RS is a highly sensitive detection, slight changes in the molecular structure can be clearly distinguished in the Raman spectrum.…”

Section: Rs Instrumentation Sampling and Data Analysis A Basicmentioning

confidence: 99%

Review on the photonic techniques suitable for automatic monitoring of the composition of multi-materials wastes in view of their posterior recycling

et al. 2021

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In the increasingly pressing context of improving recycling, optical technologies present a broad potential to support the adequate sorting of plastics. Nevertheless, the commercially available solutions (for example, employing near-infrared spectroscopy) generally focus on identifying mono-materials of a few selected types which currently have a market-interest as secondary materials. Current progress in photonic sciences together with advanced data analysis, such as artificial intelligence, enable bridging practical challenges previously not feasible, for example in terms of classifying more complex materials. In the present paper, the different techniques are initially reviewed based on their main characteristics. Then, based on academic literature, their suitability for monitoring the composition of multi-materials, such as different types of multi-layered packaging and fibre-reinforced polymer composites as well as black plastics used in the motor vehicle industry, is discussed. Finally, some commercial systems with applications in those sectors are also presented. This review mainly focuses on the materials identification step (taking place after waste collection and before sorting and reprocessing) but in outlook, further insights on sorting are given as well as future prospects which can contribute to increasing the circularity of the plastic composites’ value chains.

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Identification of Shredded Plastics in milliseconds using Raman spectroscopy for recycling

Cited by 14 publications

References 1 publication

Automated sorting of polymer flakes: Fluorescence labeling and development of a measurement system prototype

Automated sorting of polymer flakes: Fluorescence labeling and development of a measurement system prototype

Evaluation of Marker Materials and Spectroscopic Methods for Tracer-Based Sorting of Plastic Wastes

Review on the photonic techniques suitable for automatic monitoring of the composition of multi-materials wastes in view of their posterior recycling

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