Colour management in circular economy: decolourization of cotton waste

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • VTT Technical Research Centre of Finland
  • Fortum Oyj

Abstract

Purpose – While aiming to create methods for fibre recycling, the question of colours in waste textiles is also in focus; whether the colour should be kept or should be removed while recycling textile fibre. More knowledge is needed for colour management in a circular economy approach.
Design/methodology/approach – The research included the use of different dye types in a cotton dyeing process, the process for decolourizing and the results. Two reactive dyes, two directdyes and one vat dye were used in the study. Four chemical treatment sequences were used to evaluate colour removal from the dyed cotton fabrics, namely, HCE-A, HCE-P-A, HCE-Z-P-A and HCE-Y-A.
Findings – The objective was to evaluate how different chemical refining sequences remove colour from direct, reactive and vat dyed cotton fabrics, and how they in fluence the specific cellulose properties. Dyeing methods and the used refining sequences in fluence the degree of colour removal. The highest achieved final brightness of refined cotton materials were between 71 and 91 per cent ISO brightness, depending on the dyeing method used.

Details

Original languageEnglish
Pages (from-to)134-152
Number of pages19
JournalResearch Journal of Textile and Apparel
Volume23
Issue number2
Publication statusPublished - 29 May 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Circular economy, Colour management, Decolourization, Fibre recycling

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