Behaviour of biopolishing on dyeability and certain properties of cotton fabrics (original) (raw)
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NNOVATIVE technology for preparation of multifunctionalized ….. cotton fabrics with high technical performance was established. The innovation entailed the following consecutive sequence: cotton fabrics were subjected to cellulase biotreatment followed by reactive dyeing then easy care finishing treatment. pH was adjusted at 7 before commencing dyeing and finishing. No washing or drying was involved in the sequence. The so obtained fabrics displayed high technical performance as monitored by color strength, wrinkle recovery angle, retained strength in addition to softness and smoothness. Anchoring the enzyme to the cotton fabric ought to be taken as one of the reasons accounting for such high performance. It is believed that the enzyme protein molecules are fixed and immobilized within the molecules structure of cotton via their attachment to the cellulose hydroxyls by the finish molecules. The latter acts as bridges connecting the protein molecules of the enzyme with the cellulose macromolecules of the cotton fabric.
Terry fabrics are exposed to frequent and intensive washing and must therefore be resistant to water, alkali, washing agents and rubbing. Washing agents frequently contain cellu-lase enzymes. The influence of two kinds of cellulase enzymes on the properties of a 100% cotton terry fabric was investigated. The whole cellulase mixture and an endoglucanase-rich cellulase product were used. Fabric strength, resistance to rubbing, wettability, hand feeling, whiteness and other properties were observed. Moreover the influence of different pretreatment processes on the properties of the terry fabric was investigated. The fabric was scoured with alkali or with pectinase enzymes, and bleached with hydrogen peroxide or peracetic acid. It was established that enzymatic scouring and peracetic acid bleaching consume less energy and water but provide fabrics with lower whiteness and wettability, suitable only for further dyeing in dark or medium shades. Cellulases deteriorate the properties of terry fabrics; however, worse are the whole cellulase mixtures.
Effects of enzymatic treatment on the physical properties of handloom cotton fabrics
2016
Biotechnology in textiles is one of the revolutionary ways to promote textile field. Bio-processing were accompanied by a significant lower demand of energy, water, chemicals, time and costs. In the world are carried out investigations to replace conventional chemical textile processes by eco-friendly and economically attractive bioprocesses using enzymes. This paper will show the experimental results relating to optimization of the treatment processes with neutral cellulase enzyme to improve physical properties of handloom cotton fabric. Cellulase enzymes are known as effective in treatments of cotton fabric. For the use of neutral cellulase enzyme and evaluate in physical properties like weight loss, moisture content, strength loss, bending length and water absorption on cotton fabric was made optimization of the conditions of concentration, treatment time and temperature. From these results was chosen an optimum enzyme concentration-2.0% owf (on weight of fabric), treatment time-...
The effect of cellulase treatment in textile washing processes
Journal of The Society of Dyers and Colourists, 2008
An attempt has been made to understand the interaction between cellulase hydrolysis and mechanical agitation by separating them into two sequential steps. Cotton fabrics were treated with cellulase mixtures of different compositions, and then washed in a process involving a high level of mechanical agitation. The cellulosic material removed during washing had different amounts of reducing ends depending on the cellulase composition used in the initial treatment. The fibre surface did not change significantly after cellulase treatment, but after washing the surface properties were completely different depending on whether the fabric had been previously treated with an endoglucanase– or a cellobiohydrolase–rich preparation. When denim fabrics were subjected to similar processing, it was verified that an increase in colour loss occurred in enzyme–treated fabrics, and that there was an interaction between different cellulase activities and backstaining.
Egyptian Journal of Chemistry
B IORemeDIAtION using enzymes is an important tool in textile industry; therefore the goal of the present study is to subrogate the pretreatment of natural (cotton) and recovered (viscose) cellulosic fabrics with microbial acidothermophilic cellulase produced by the native egyptian fungus Aspergillus terreus RS2. the produced enzyme was examined at two activity levels (10 and 20U/mL) in order to reduce the effluent load that was produced from scouring and bleaching processes and to upgrade a naturally adequate transaction for water and power economy. the effectiveness of the enzymatic pretreatment under the optimum conditions on raw, scoured and bleached cellulosic fabrics has been proved as the results indicated an increase in the color intensity of the treated fabrics in compare to the untreated one for different classes of reactive dyes based on Anthraquinones and Double azo. the fastness properties of the pretreated dyed fabrics were implemented. the contact angle for the pretreated cellulosic fabrics, tensile strength, Scanning electron microscopy and FtIR analyses were performed.
Surface activation of dyed fabric for cellulase treatment
Biotechnology Journal, 2011
Surface activation of fabric made from cellulose fibres, such as viscose, lyocell, modal fibres and cotton, can be achieved by printing of a concentrated NaOH-containing paste. From the concentration of reducing sugars formed in solution, an increase in intensity of the cellulase hydrolysis by a factor of six to eight was observed, which was mainly concentrated at the activated parts of the fabric surface. This method of local activation is of particular interest for modification of materials that have been dyed with special processes to attain an uneven distribution of dyestuff within the yarn cross-section, e.g., indigo ring-dyed denim yarn for jeans production. Fabrics made from regenerated cellulose fibres were used as model substrate to express the effects of surface activation on indigo-dyed material. Wash-down experiments on indigo-dyed denim demonstrated significant colour removal from the activated surface at low overall weight loss of 4-5%. The method is of relevance for a more eco-friendly processing of jeans in the garment industry.
Biotreatment of desized cotton fabric by commercial cellulase and xylanase enzymes
Journal of Molecular Catalysis B: Enzymatic, 2001
Desized cotton fabric was subjected to biotreatment with seven commercial cellulase and hemicellulase enzymes in non-agitated and agitated systems at 508C for 0.5-4 h. The enzymes performed better in agitated bath than in non-agitated Ž ones. All enzymes at 1 grl concentration in 2 h caused weight loss less than 6%. Those three enzymes Celluclast 1.5, Ž .. Ž . Cellusoft L and Cellulase EBT which exhibited the highest filter paper activity FPA showed the most aggressive action on cotton in agitated system at 1 grl concentration when time of treatment exceeded 2 h. q