NOPR Community:

Physico-chemical nature of ramie at different stages of growth

1995-09-01T00:00:00Z

Title: Physico-chemical nature of ramie at different stages of growth Authors: Kundu, P K; Sarmah, R; Sarkar, C R Abstract: The physico-chemical nature of ramie at different stages of crop growth has been studied by infrared spectroscopy and also by biochemical estimation of gums and pectins. From IR study, the pectin has been found to be maximum for 40 days old ramie whereas the gums (mainly hemicellulose) have been found to be maximum for 70 days old ramie. The biochemical estimation of gum and pectin contents supports the results of IR study. The ramie plant can be harvested for efficient degumming after 70 days due to high formation of cellulose and less formation of pectin. Page(s): 165-167

Kinetics of dyeing of rotor- and ring-spun cotton yarns

1995-09-01T00:00:00Z

Title: Kinetics of dyeing of rotor- and ring-spun cotton yarns Authors: Iyer, V; Iyer, J K; Shenai, V A Abstract: Ring-spun and rotor-spun cotton yarns were dyed with one commercial reactive dye (Amective Golden Yellow IRX) and two direct dyes (Chrysophenine G and Incomine Sky Blue 6B) at three different temperatures till the equilibrium was attained in each case. The dye bath exhaustion and equilibrium exhaustion values were used to calculate the apparent diffusion coefficients using a simple equation. Tile apparent diffusion coefficients determined at different temperatures were further used to derive the apparent activation energy of the dyeing process. The activation energies for both ring-spun and rotor-spun yarns have been found to be comparable. The apparent activation energies of direct dyes are much higher than those of reactive dyes. Page(s): 161-164

Syntheses and dyeing properties of 1, 4-bis{N-[6-(2-arylazo-l-hydroxy-3- sodium sulphonatonaphth-6-ylamino)-2- chloro-s- triazin-6-yl]} phenylenediamines

1995-12-01T00:00:00Z

Title: Syntheses and dyeing properties of 1, 4-bis{N-[6-(2-arylazo-l-hydroxy-3- sodium sulphonatonaphth-6-ylamino)-2- chloro-s- triazin-6-yl]} phenylenediamines Authors: Vashi, H J; Desai, K R Abstract: 6-(2, 4-dichloro-s-triazin-6-ylamino)-l-hydroxynaphthalene- 3-sulphonic acid (III), obtained by the treatment of cyanuric chloride (II) with 6-amino-I-hydroxynaphthalene- 3-sulphonic acid (I), was coupled separately In alkaline medium with twelve different diazotized amino compounds (IVa-I) containing sulphonic acid group(s) to obtain 2-arylazo-6-(2, 4-dichloro-s-triazin-6-ylamino)-1-hydroxynaphthalene-3-sulphonic acid sodium sa.lts (Va-I). Compounds (Va-I) were separately treated With p-phenylenediamine (VI) to give 1, 4-bis{N-[6-(2-arylazo-1-hydroxy-3-sodium sulphonatonaphth-6-yiamino)- 2-chloro-s-triazin-6-yl]} phenylenediamines (VIIa-I). The compounds VIIa-I when applied on silk, wool and viscose rayon fabrics gave generally brown and violet shades with good levelness, brightness and depth on these fabrics. Further, all the compounds showed high degree of fixation and high fastness levels. Page(s): 218-221

Influence of process parameters on flexural rigidity and elastic recovery of mjs yarns

1995-12-01T00:00:00Z

Title: Influence of process parameters on flexural rigidity and elastic recovery of mjs yarns Authors: Tyagi, G K; Kaushik, R C D; Salhotra, K R Abstract: Fibre linear density plays a key role in determining the flexural rigidity and elastic recovery of mjs yarns. The feed ratio, main draft, nozzle pressure and production speed have significant influence on flexural rigidity. The variation in either second nozzle pressure or production speed has little effect on elastic recovery. The elastic recovery, however, increases with the increase in feed ratio, main draft and first nozzle pressure. Page(s): 214-217