Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8391
Title: Ozone applications for after-clearing of disperse-dyed poly(lactic acid) fibres
Authors: Avinç, Osman Ozan
Eren, H.A.
Uysal, P.
Keywords: Clearing process
Colour differences
Conventional treatments
Decolorisation
Distilled water
Dye bath
Dye-bath effluents
Fastness properties
Ozonation process
Ozone dose
Ozone treatment
Poly lactic acid
Room temperature
Sodium dithionite
Wash fastness
Chemical oxygen demand
Color printing
Dyeing
Effluents
Lactic acid
Ozone water treatment
Ozonization
Sodium
Ozone
Abstract: In this study, the effectiveness of the ozonation process, in neutral distilled water at room temperature, as a clearing process for disperse-dyed poly(lactic acid) fibre fabrics is investigated. The efficiency of simultaneous decolorisation of dyebath effluent and clearing of dyed poly(lactic acid) in the cooled dyebath after completion of the poly(lactic acid) dyeing cycle is also explored. Conventional alkaline reduction clearing with sodium dithionite was chosen as a control clearing process for comparison. Wash fastness, colour difference, colour removal (in Hazen) and chemical oxygen demand values were determined and compared. Long ozone treatment times at high ozone dose resulted in unacceptable colour differences. The colour difference problem was solved by use of lower ozone dose; however, a warm soaping step had to be added to the after-clearing sequence in order to achieve the desired fastness properties. A 33% reduction on the chemical oxygen demand load of the total process (dyeing+after-clearing) could be achieved by ozone after-clearing instead of using a conventional reduction clearing treatment. The addition of the warm soaping step to improve the fastness properties of the ozonated samples increased the total chemical oxygen demand of the process (dyeing+ozonation in water+warm soaping), but a 12-18% reduction on the chemical oxygen demand load of the total process was observed when compared with the conventional treatment sequence (dyeing+reduction clearing). © 2012 The Authors. Coloration Technology © 2012 Society of Dyers and Colourists.
URI: https://hdl.handle.net/11499/8391
https://doi.org/10.1111/j.1478-4408.2012.00403.x
ISSN: 1472-3581
Appears in Collections:Mühendislik Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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