Identification of cellulose textile fibers

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-12-21
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
7503-7509
Series
Analyst, Volume 146, issue 24
Abstract
Distinguishing different textile fibers is important for recycling waste textiles. Most studies on non-destructive optical textile identification have focused on classifying different synthetic and natural fibers but chemical recycling requires more detailed information on fiber composition and polymer properties. Here, we report the use of near infrared imaging spectroscopy and chemometrics for classifying natural and regenerated cellulose fibers. Our classifiers trained on images of consumer textiles showed 100% true positive rates based on model cross-validation and correctly identified on average 8-9 out of 10 test set pixels using images of specifically made cotton, viscose and lyocell samples of known compositions. These results are significant as they indicate the possibility to monitor and control fiber dosing and subsequent dope viscosity during chemical recycling of cellulose fibers. Our results also suggested the possibility to identify fibers purely based on polymer chain length. This finding opens the possibility to indirectly estimate dope viscosity and creates entirely new hypotheses for combining imaging spectroscopy with classification and regression methods within the broader field of cellulose modification.
Description
We gratefully acknowledge the contribution of Kirsti Cura from Lahti University of Applied Sciences for providing some of the training samples and Anna Leinonen, a knitting workshop master at Aalto University, for preparing the test set fabrics. This work was financially supported by the Strategic Research Council of the Academy of Finland under grant agreement no. 327296 – the FINIX project (finix.aalto.fi).
Keywords
WASTE, SPECTROSCOPY
Other note
Citation
Mäkelä , M , Rissanen , M & Sixta , H 2021 , ' Identification of cellulose textile fibers ' , Analyst , vol. 146 , no. 24 , pp. 7503-7509 . https://doi.org/10.1039/d1an01794b