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1.
Influence of enzymatic pretreatment on colour of bleached and dyed flax fibres
Darinka Fakin, Vera Golob, Karin Stana-Kleinschek, 2006, izvirni znanstveni članek

Opis: In this paper the effect of enzymatic bioscouring on the bleaching and dyeing of flax fibres was studied in comparison with conventional alkaline scouring. Enzymatic bioscouring was performed with a commercial multi-enzyme system consisting of pectinases, hemicellulases and cellulases. The enzyme and alkaline scoured flax fibres were subsequently oxidatively bleached with hydrogen peroxide and dyed with direct dye C.I. Direct Red 80 under the same conditions. The efficiency of both the scouring and bleaching processes was evaluated by weight loss and the whiteness of the bleached samples was determined according to CIE formula. The exhaustion profile of the used dye was followed on-line during the dyeing process using absorbance measurement. The colours of bleached and dyed samples were evaluated using CIELAB colour values. The residual pretreatment and dyeing baths were ecologically analysed with COD, TOC and BOD5. The obtained results indicate that enzymatic scouring provides a lower weight loss, a higher degree of whiteness, comparable dyeing properties and is more environmentally friendly.
Ključne besede: textile fibres, flax, linen fibres, enzymatic pretreatment, dyeing, bleaching
Objavljeno: 31.05.2012; Ogledov: 880; Prenosov: 12
URL Povezava na celotno besedilo

2.
The effect of pretreatment on the environment and dyeing properties of a selected cotton knitted fabric
Darinka Fakin, Darko Golob, Zoran Stjepanović, 2008, izvirni znanstveni članek

Opis: The current preparation of cotton knitted fabric prior to dyeing mainly involves a combined process consisting of scouring and peroxide bleaching. In this research two pre-treatment procedures, i.e. combined alkaline scouring/bleaching and enzymatic scouring/bleaching, were compared and their effects evaluated regarding environmental impact, whiteness and dyeing properties. Different pre-treated samples of cotton knitted fabrics were subsequently dyed with a chosen set of bifunctional reactive Cibacron LS dyes.The results obtained indicate that combined pre-treatment by enzymatic scouring/bleaching can be regarded as a good alternative to alkaline scouring/bleaching since it results in lower pollution of waste-water, lower SAK value after dyeing, washing and soaping, and consequently lower hydrolysation of dyestuff. Furthermore, added advantages are that it produces similar whiteness, similar dye exhaustion and, with the exception of black dyestuff, comparable dyeing results.
Ključne besede: cotton, pretreatment, bleaching, dyeing, ecological parameters
Objavljeno: 31.05.2012; Ogledov: 1188; Prenosov: 14
URL Povezava na celotno besedilo

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