Towards circular plastics: Density and MFR prediction of PE with IR spectroscopic techniques

Bredács, Márton; Geier, J.; Horvath, Raphael; Gergely, Szilveszter

doi:10.1016/j.polymertesting.2023.108094

Cited by 6 publications

(4 citation statements)

References 49 publications

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Section: Resultsmentioning

confidence: 99%

“…Recent studies showed the potential for improving the mechanical sorting in plastics recycling 13,89–91 . They indicated that plastics can be better sorted by adjusting the measurement setup or improving the data analysis methods 13,90,91 . The study by Bredács et al showed that PE samples with different densities can be categorized into different classes using multivariate data analysis (MVDA) of NIR data from an industrial sorting line 90 .…”

Section: Resultsmentioning

confidence: 99%

“…They indicated that plastics can be better sorted by adjusting the measurement setup or improving the data analysis methods 13,90,91 . The study by Bredács et al showed that PE samples with different densities can be categorized into different classes using multivariate data analysis (MVDA) of NIR data from an industrial sorting line 90 . The use of another spectroscopic technique even showed promising results in predicting the density and MFR of PE 90 .…”

Section: Resultsmentioning

confidence: 99%

“…The study by Bredács et al showed that PE samples with different densities can be categorized into different classes using multivariate data analysis (MVDA) of NIR data from an industrial sorting line 90 . The use of another spectroscopic technique even showed promising results in predicting the density and MFR of PE 90 . Another study demonstrated the potential to improve the sorting of PP grades 91 .…”

Section: Resultsmentioning

confidence: 99%

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Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Geier,

Barretta,

Hinczica

et al. 2024

J of Applied Polymer Sci

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Polypropylene (PP) recyclates face limitations in their use due to lower qualities compared with virgin PP, resulting from contaminations and the mixing of different PP grades. In particular, their high melt flow rate (MFR) hinders their suitability for applications requiring low MFR, such as pipes. This study investigates the feasibility of producing low MFR PP recyclates from packaging waste. For this purpose, recyclates were produced exclusively from manually sorted extrusion blow molding grades and compared with a recyclate derived from a conventional PP waste stream. Different washing temperatures and recyclate production processes were used to study their effects on the properties of the recyclates. The main objective was to determine the lowest achievable MFR and the rheological, mechanical, and thermal properties of the recyclates from improved sorting. The results are intended to serve as reference points for the evaluation of future automatic sorting trials. The enhanced sorting resulted in an 80% reduction in the MFR and improved ductility, thereby extending the potential applications of the recyclate. The different washing and production processes did not have a significant effect on the investigated properties, except for a slight decrease in the MFR with hot washing and the omission of the pelletizing step.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Geier,

Barretta,

Hinczica

et al. 2024

J of Applied Polymer Sci

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Design and manufacturing diversity undermine circularity: The case of a simple yogurt cup

Schlossnikl,

Gritsch,

Koch

et al. 2025

Resources, Conservation and Recycling

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Mid-infrared dual-comb spectroscopy with quantum cascade lasers

Hayden,

Geiser,

Gianella

et al. 2024

APL Photonics

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Since its invention in 1994, the quantum cascade laser (QCL) has emerged as a versatile light source of wavelength 4–12 µm, covering most of the mid- and long-wavelength infrared spectral ranges. Its application range has widened even further since frequency comb operation and its use as a light source for dual-comb spectroscopy (DCS) was demonstrated. In this tutorial, we introduce the unique properties of QCL frequency combs, such as high optical power, multi-GHz repetition rate, and narrow optical linewidths. Implemented in a dual-comb spectroscopy setup, this allows for broadband, low-noise measurements of strongly absorbing samples with sub-microsecond time resolution, and spectral resolution better than 10−3 cm−1/30 MHz. The advantages of QCL DCS will be discussed in the context of its broad range of applications. The high optical power (both total and per comb tooth) is leveraged for measurements in aqueous solution or at large stand-off distances. Microsecond temporal resolution measurements address the demand for probing rapid protein dynamics and combustion diagnostics. MHz-level spectral resolution, in turn, facilitates accurate line parameter studies in low pressure and cold molecular gases. Future development directions of the technology are discussed, including sub-microsecond response DCS, instrument miniaturization, or its expansion toward THz frequencies. Overall, the tutorial aims at giving a broad introduction to QCL DCS and its applications.

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Towards circular plastics: Density and MFR prediction of PE with IR spectroscopic techniques

Cited by 6 publications

References 49 publications

Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Feasibility study on the production of low melt flow rate recycled polypropylene from postconsumer waste

Design and manufacturing diversity undermine circularity: The case of a simple yogurt cup

Mid-infrared dual-comb spectroscopy with quantum cascade lasers

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