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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, original scientific article

Abstract: 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.
Keywords: textile fibres, flax, linen fibres, enzymatic pretreatment, dyeing, bleaching
Published: 31.05.2012; Views: 878; Downloads: 12
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2.
The effect of pretreatment on the environment and dyeing properties of a selected cotton knitted fabric
Darinka Fakin, Darko Golob, Zoran Stjepanović, 2008, original scientific article

Abstract: 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.
Keywords: cotton, pretreatment, bleaching, dyeing, ecological parameters
Published: 31.05.2012; Views: 1185; Downloads: 14
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3.
Hydrophilic/hydrophobic characteristics of different cellulose fibres monitored by tensiometry
Zdenka Peršin, Karin Stana-Kleinschek, Tatjana Kreže, 2002, original scientific article

Abstract: Wettability and sorptivity improvements for different textile materials are the major tasks during textile finishing. In order to improve the sorption characteristics of a cellulose fabric, different pre-treatment processes are applied, usually washing, bleaching and mecerisation. Differences in the sorption properties of untreated and pretreated (washed and bleached) regenerated cellulose fibres were obtained using tensiometry and compared with the classical method for determining moisture adsorption. Results show that compared to raw fibres, viscose fibres have the highest moisture and the smallest contact angle whilst modal fibres have the biggest contact angle. Pretreatment increases the sorption abilities and makes the material more accessible to chemicals used in the finishing process. Using the conventional method, it can be confirmed that fibres with the highest moisture have the smallest contact angle (tensiometry).
Keywords: textile materials, regenerated cellulose fibres, sorption, pretreatment, tensiometry
Published: 05.07.2017; Views: 276; Downloads: 58
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