http://nopr.niscair.res.in/handle/123456789/3362 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/6886 Title: Application of natural dyes on textiles <br/> <br/>Authors: Samanta, Ashis Kumar; Agarwal, Priti <br/> <br/>Abstract: This paper reports the studies available on the characterization and chemical/biochemical analysis of natural dyes; extraction of colorants from different natural sources; effects of different mordants and mordanting methods; conventional and non-conventional methods of natural dyeing; physico-chemical studies on dyeing process variables and dyeing kinetics; development of newer shades and analysis of colour parameters for textiles dyed with natural dyes; and test of compatibility for application of binary mixture of natural dyes. The chemical modification of textile substrate for improving dyeability, attempts for improvement in overall colour fastness properties and survey of some traditional processes of natural dyeing in different parts of India have also been discussed. <br/> <br/>Page(s): 384-399 Sat, 28 Nov 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/6885 Title: A sharp technique for identification of defective points in false twist textured yarns <br/> <br/>Authors: Semnani, Dariush; Gholami, Ali <br/> <br/>Abstract: Fast Fourier Transformation technique has been used to classify the defective points in the yarn surface into three classes, namely less important defective points of textured yarn containing surface fibres and broken filaments; medium defective points; and large and unusual defective points. The results obtained from textured yarn with 300 Nm show that this method can be considered for commonly used yarns in acceptable accuracy. This method can detect the defects in a fraction of seconds and can be installed on machines. <br/> <br/>Page(s): 380-383 Sat, 28 Nov 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/6884 Title: Superhydrophobic cotton by fluorosilane modification <br/> <br/>Authors: Erasmus, E; Barkhuysen, F A <br/> <br/>Abstract: Cotton with a superhydrophobic surface and self-cleaning ability has been prepared by the treatment with 1H, 1H, 2H, 2H-fluorooctyl triethoxysilane. An increased level of treatment increases the water contact angle, thereby exhibiting a self-cleaning ability. <br/> <br/>Page(s): 377-379 Sat, 28 Nov 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/6883 Title: Grafting of acrylonitrile monomer onto bleached okra bast fibre and its textile properties <br/> <br/>Authors: Khan, G M Arifuzzaman; Saheruzzaman, Md; Razzaque, S M Abdur; Islam, Md Sakinul; Alam, Md Shamsul; Islam, Md Mainul <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> The graft copolymerization of acrylonitrile monomer onto okra bast fibre has been carried out using potassium persulphate as an initiator in the presence of ferrous sulphate. The graft yield is evaluated on varying the concentration of monomer from 1.0×10^-2 to 7.0×10^-2 mol L^-1 and concentration of potassium persulphate from 1.0×10^-3 to 7.0×10^-3 mol L^-1 at ferrous sulphate concentration varying from 1.0×10^-3 to 7.0×10^-3 mol L^-1 in the reaction mixture. The graft yield and other grafting parameters have been optimized at 3.0×10-2 mol L^-1 monomer, 4.0×10^-3 mol L^-1 potassium persulphate, 5.0×10^-3mol L^-1 ferrous sulfate, 120 min treatment time and 70°C temperature. The composition of grafted chain is characterized by Fourier transform infrared spectra and scanning electron microscopic studies. Dyeing and tensile properties of grafted okra bast fibre have also been studied. The grafted fibre shows better properties in all cases in comparison to bleached okra bast fibre. </smarttagtype> <br/> <br/>Page(s): 321-327 Sat, 28 Nov 2009 22:58:59 GMT