NOPR Collection:

Dyeing behaviour of open-end and ring-spun cotton yarns

1991-09-01T00:00:00Z

Title: Dyeing behaviour of open-end and ring-spun cotton yarns Authors: Iyer, V; Shenai, V A Abstract: The differences in the dyeing behaviour of open-end and ring-spun yarns have been studied using a number of direct, vat and reactive dyes, and the absorbance values for the percentage exhaustion and dye uptake for a fixed period are reported. The percentage exhaustion does not show any significant difference between rotor-spun and ring-spun yarns whether dyed separately or in the same dye-bath. The dye uptake values, however, are generally higher for rotor-spun yarns when dyed with ring-spun yarns in one dye-bath. Page(s): 236-238

Effect of sliver preparation on fibre disorder at rotor groove

1991-09-01T00:00:00Z

Title: Effect of sliver preparation on fibre disorder at rotor groove Authors: Ishtiaque, S M; Saxena, Ajay Abstract: The fibre disorder at rotor groove was measured by using Lindsley's technique. The effect of draw frame passages on fibre disorder at rotor groove and in feed sliver was studied. Fibre orientation at rotor groove has been found to be inferior to that in feed sliver. Better fibre straightening with no significant improvement in fibre parallelization is achieved with the second drawing passage. Page(s): 233-235

Synthesis of azo disperse dyes containing thiadiazole ring for dyeing acetate and/or other fibres

1991-09-01T00:00:00Z

Title: Synthesis of azo disperse dyes containing thiadiazole ring for dyeing acetate and/or other fibres Authors: Fadda, A A; Amer, F A; El-Said, A M; Elagizy, S A Abstract: Twenty arylazo derivatives of 5-(2-hydroxyphenyl)-2-phenylamino-1,3,4-thiadiazole and its 3-ethyl derivative have been prepared for use as dyestuffs. The effect of the nature and orientation of substituents in the diazonium component on the colour of azo dyes is discussed. The dyeing performance of the dyes on different fibres has also been assessed. Page(s): 226-232

Synthesis of 3-aryl- and hetaryl-azo- 2-carbethoxy-4,6-dimethylthieno- [2,3-b]pyridines and their application on polyester fibres as disperse dyes

1991-09-01T00:00:00Z

Title: Synthesis of 3-aryl- and hetaryl-azo- 2-carbethoxy-4,6-dimethylthieno- [2,3-b]pyridines and their application on polyester fibres as disperse dyes Authors: Rangnekar, D W; Kamat, P Y Abstract: 2-chloro-3-cyano-4,6-dimethylpyridine obtained from 3-cyano-4,6-dimethyl-2-pyridone by treatment with phosphorus pentachloride in refluxing phosphorus oxychloride was reacted with ethyl thioglyocollate in refluxing methanol containing anhydrous sodium carbonate to get 3-amino-2-carbethoxy- 4,6-dimethylthieno[2,3-b]pyridine. 3-Amino-2-carbethoxy thieno[2,3-b]pyridine derivative thus obtained was di.azotized and coupled with N,N-dialkylanilines and heterocyclic hydroxy couplers to result 3-aryl- and hetaryl-aw-2-carbethoxy-4,6-dimethylthieno[2,3-b]pyridines. These azo dyes when applied on polyester fibres as disperse dyes gave yellow to red violet shades with excellent pick up, moderate light fastness and good to very good sublimation fastness. Page(s): 223-225