Cashmere is byword for soft, luxury, and expensive stylish clothes. Objective and quantitative methods to identify and possibly quantify recycled cashmere are crucial to discourage adulteration of high-quality virgin cashmere with cheaper recycled fibers.Available analytical methods for the identification of recycled and virgin fibers are currently confined to subjective assays. This work investigates objective and reliable methodologies to quantify the amount of recycled cashmere in blend with virgin one, based on the different dye absorption capacity of recycled and virgin fibers. Pure virgin and recycled cashmere fibers were stained with different amounts of C.I. Direct Red 7 in different conditions, and the exhaust dyebaths were analyzed by UV-visible Spectroscopy in order to quantify the residual unabsorbed dye. Then, the method was applied to blends of different proportions of virgin and recycled cashmere with a correlation of R2 = 0.95.

Colorimetric Quantification of Virgin and Recycled Cashmere Fibers: Equilibrium, Kinetic, and Thermodynamic Studies

Anastasia Anceschi
Primo
Writing – Original Draft Preparation
;
Marina Zoccola
Secondo
Writing – Review & Editing
;
Raffaella Mossotti;Parag Bhavsar;Giulia Dalla Fontana;Alessia Patrucco
Ultimo
Supervision
2021

Abstract

Cashmere is byword for soft, luxury, and expensive stylish clothes. Objective and quantitative methods to identify and possibly quantify recycled cashmere are crucial to discourage adulteration of high-quality virgin cashmere with cheaper recycled fibers.Available analytical methods for the identification of recycled and virgin fibers are currently confined to subjective assays. This work investigates objective and reliable methodologies to quantify the amount of recycled cashmere in blend with virgin one, based on the different dye absorption capacity of recycled and virgin fibers. Pure virgin and recycled cashmere fibers were stained with different amounts of C.I. Direct Red 7 in different conditions, and the exhaust dyebaths were analyzed by UV-visible Spectroscopy in order to quantify the residual unabsorbed dye. Then, the method was applied to blends of different proportions of virgin and recycled cashmere with a correlation of R2 = 0.95.
2021
Istituto di Sistemi e Tecnologie Industriali Intelligenti per il Manifatturiero Avanzato - STIIMA (ex ITIA) Sede Secondaria Biella
Cashmere
recycling
recycled fibers
quantification
adsorption kinetics
thermodynamics
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Descrizione: Published in Journal of Natural Fibers - DOI: 10.1080/15440478.2021.2009399
Tipologia: Documento in Pre-print
Licenza: Creative commons
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/447033
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