NOPR Collection:

Characterization of neps in spinning processes

2016-07-20T04:28:21Z

Title: Characterization of neps in spinning processes Authors: Desai, A N; Krishnaswamy, R; Thornbare, D G Abstract: Nep level and nep size distribution at different stages of cotton spinning has been studied with the help of Advanced Fibre Information System (AFIS). Importance of nep size, particularly for finer counts, and some of the ways and means of nep size reduction is brought out. The concept of critical nep size as enunciated by Zellweger Uster is made use of in the studies. Studies also highlight the fact that lower level of neps/g in card sliver does not necessarily mean lower level of neps in the yarn. The rate of change of cumulative nep size slows down, as per cent of total neps, from raw material stage to finisher drawing stage, except in blow room. At blow room, not only neps/g but their size also shows an increase. Card sliver hank and combing parameters such as feed/nip, cushion plate to half lap setting and top comb penetration have a critical influence on the nep size in combed material. Page(s): 99-102

Studies on dyeing with natural dyes: Part I—Dyeing of annato on nylon and polyester

2016-07-20T04:46:02Z

Title: Studies on dyeing with natural dyes: Part I—Dyeing of annato on nylon and polyester Authors: Gulrajani, M L; Gupta, Deepti; Maulik, S R Abstract: Nylon and polyester fibres have been dyed with carotenoid dye bixin—the colour component of annato. It is observed that though both the fibres have good affinity for this dye, the mechanism of dye adsorption , as indicated by the isotherms, is different in each case. The dye has moderate fastness to washing but poor to light. Page(s): 131-135

Evaluation of different methods of solid waste disposal in silk reeling industry

2016-07-20T04:37:06Z

Title: Evaluation of different methods of solid waste disposal in silk reeling industry Authors: Halliyal, V G; Dandin, S B; Somashekar, T H Abstract: The different methods of basin refuse separation practiced in reeling industry have been evaluated in terms of recovery and quality of bisu fibres. It is observed that there is an urgent need to handle this valuable waste by appropriate and efficient processing method in order to preserve the fibre quality and improve fibre recovery for further utilization. Page(s): 115-119

Synthesis and application of metal complex dyes derived from 5-arylazo-4-hydroxy-2-phenylpyridazin-3-one

2016-07-20T04:35:38Z

Title: Synthesis and application of metal complex dyes derived from 5-arylazo-4-hydroxy-2-phenylpyridazin-3-one Authors: Rangnekar, D W; Kanetkar, V R; Malanker, J V; Shankarling, G S Abstract: Six monoazo metal complex dyes (VIII a-c and IX a-c) were derived from 5-arylazo-4-hydroxy-2-phenylpyridazine-3-ones (VI and VII) respectively and their dyeing performance on wool fibres was assessed. The compounds VI and VII were obtained by the diazotisation of 5-amino-4-chloro-2-phenylpyridazin-3-one (IV) and its coupling with gamma acid and schaffer's acid respectively. The key compound IV was prepared by the ammonolysis of 4.5-dichloro-2-phenylpyridazin-3-one (III) which was obtained by the condensation of phenylhydrazin (I) and mucochloric acid (II). The metal complex dyes when applied on wool fibres gave reddish violet to brown shades with excellent pick-up, light fastness and wash fastness. Page(s): 142-144