NOPR Collection:

Discharge prints on cotton dyed with indigo and sulphur dyes

2016-07-20T06:06:29Z

Title: Discharge prints on cotton dyed with indigo and sulphur dyes Authors: Chavan, R B; Bhargava, H Abstract: The use of oxidizing agents such as sodium hypochlorite, bleaching powder and potassium permanganate is quite common to produce various wash effects by treating cotton readymade garments manufactured from indigo/sulphur yarn/piece dyed fabrics in a wash wheel in a specialized manner. This being a blind process, considerable amount of experience and skills are essential. The unacceptable effects and hence rejects are not alw.ays avoidable. To overcome these problems, sodium hypochlorite has been applied using Bentonite clay as a thickener through a technique of screen printing. It is hoped that this technique would be easily adoptable to produce not only the conventional wash effects using specially designed screens but also in the production of very interesting discharge print patterns. Page(s): 63-64

Syntheses of bisazo reactive dyes based on 6,6' -methylene-bis-anthranilic acid and their application on various fibres

2016-07-20T06:05:32Z

Title: Syntheses of bisazo reactive dyes based on 6,6' -methylene-bis-anthranilic acid and their application on various fibres Authors: Patel, R B; Patel, P S; Patel, S K; Patel, K C Abstract: Ten bisazo reactive dyes (VIIa-j) have been prepared by coupling diazotised 6,6'-methylene-bis anthranilic acid (III) with various anilino cyanurated coupling components, viz. anilino cyanurated H-acid, Schaffer acid, G-acid, I-acid, K-acid, Tobias acid, N-phenyl J-acid, N-methyl J-acid, Gamma acid and R-acid (VIa-j), and their dyeing performance on viscose rayon, wool and silk fibres has been assessed. All the dyes gave a wide range of brown to blue shades with very good depth and levelness on each fibre. The purity of VIIa-j was checked by thin layer chromatography. The IR spectra showed all characteristic bands. The percentage dye-bath exhaustion on different fibres was reasonably good and acceptable. The dyed fibres showed fair to very good fastness to light, washing and rubbing. Page(s): 59-62

Efficacy of proteases on degumming of dupion silk

2016-07-20T06:04:27Z

Title: Efficacy of proteases on degumming of dupion silk Authors: Gulrajani, M L; Sen, Shalini; Soria, Anubhuti; Suri, Mona Abstract: Dupion silk was degummed with seven different commercial proteases. Conditions with respect to concentration and time were optimised for each enzyme and degumming efficiency calculated The treated samples were tested for tensile strength, handle, lustre and microscopic structure. Alkaline proteases have shown good results and the efficiency of degumming has been found to vary with the variety of dupion. Page(s): 52-58

Chemical resistance and tensile properties of styrenated polyester-coated bamboo fibres

2016-07-20T05:59:52Z

Title: Chemical resistance and tensile properties of styrenated polyester-coated bamboo fibres Authors: Rajulu, A Varada; Reddy, G Ramachandra; Chari, K Narasimha Abstract: The chemical resistance and tensile load of bamboo fibres (Dendrocalamus strictus) before and after coating with styrenated polyester resin have been studied and compared with those of the bamboo fibres coated with epoxy resin. The improvements in these properties on coating indicate that the styrenated polyester, epoxy resin and bamboo fibres are favourable materials for composites. Page(s): 49-51