NOPR Collection:

Crease recovery of fabrics with air-jet textured weft yarns

2016-07-20T06:29:26Z

Title: Crease recovery of fabrics with air-jet textured weft yarns Authors: Mukhopadhyay, A; Kothari, V K Abstract: The crease recovery of fabrics in relation to the direction of creasing, pick spacing, heat setting and number of filaments in air-jet textured weft yarn has been investigated. With the increase in pick density, the warp-wise crease recovery of air-jet textured yarn fabrics decreases and a reverse trend is observed in weft direction. The textured yarn fabrics exhibit much lower crease recovery than the corresponding parent yarn fabrics. The finer filament textured yarn fabrics possess higher crease recovery than the coarser filament textured yarn fabrics. Heat setting improves the overall crease recovery of fabrics. Improvement in crease recovery is higher for textured yarn fabrics, particularly in weft direction. After heat setting, the peak value of crease recovery occurs at different biased direction. Page(s): 393-396

Estimation of fibre maturity from micronaire value

2016-07-20T06:23:27Z

Title: Estimation of fibre maturity from micronaire value Authors: Hussain, G F S; Iyer, Janaki K; Singhvi, Bindubala; Iyer, K R Krishna Abstract: Cross-sectional perimeter, degree of thickening and micronaire values for 25 Indian cotton varieties covering the entire spectrum of fineness levels have been estimated. It is observed that for a given variety, the cross-sectional perimeter remains fairly constant irrespective of the degree of maturation. This leads to a direct relationship between the micronaire value and the degree of thickening which represents the true and botanical maturity for a given variety. It is also possible to pool the varieties having perimeter within a specified range and establish the relationship between micronaire value and degree of thickening for each perimeter range. The relationships linking the above two parameters variet y-wise as well as perimeterwise have been presented. Micronaire values for gradation of varieties into three categories, namely low, normal and high, have been indicated. Page(s): 335-341

Kinetics of dyeing acrylic acid-grafted cotton fabric with basic dyes

2016-07-20T06:30:40Z

Title: Kinetics of dyeing acrylic acid-grafted cotton fabric with basic dyes Authors: El-Gendy, Eglal H K Abstract: The effect of graft yield , dye concentration and dyeing temperature on the colour strength of acrylic acid-grafted cotton fabric has been studied for Sandocryl Blue (SB) and Rhodamine Red (RR) basic dyes. It is observed that the colour strength increases with the increase in graft yield and levels off at higher degrees of grafting. The best dyeing is achieved at pH 3.9 and 2.72 for SB and RR aqueous solutions respectively. The colour strength of grafted fabrics increases rapidly with the increase in dyeing time and levels off within few minutes, depending on the dye concentration (C_o) and temperature of the dye bath. The initial dyeing rates (R_d) for SB dye are higher than those for RR dye. The dyeing process follows a 0.62 order kinetics and is almost independent of the dyeing temperature or the type of dye. Dyeing rate and rate constant increase considerably with the increase in dyeing temperature. Activation energ ies of 11.2 and 14.36 kJ/mole were calculated for SB and RR dyes respectively. The mechanism of the dyeing process for the two dyes is diffusion controlled and their dyeing rates depend on the type of basic dye. Considerably high dyeing rates are found even at temperatures as low as 282 K and the completion of the dyeing process takes place in a matter of minutes. About 70-99% of the colour strength of the samples dyed at 90°C for 1 h is obtained at dye bath temperatures ranging from 9^oC to 55°C and a dyeing time of 80s. Page(s): 422-428

Use of polysaccharide fibres for modern wound dressings

2016-07-20T06:27:52Z

Title: Use of polysaccharide fibres for modern wound dressings Authors: Ghosh, S; Jassal, M Abstract: Polysaccharide fibres like alginate, chitin, chitosan, modified cellulosic fibres, dextran, hyaluronate, pectin and(1-3)β-D-glucans are being used for modern wound dressing. This paper presents an overview of wound healing mechanism and preparation and application of above biopolymeric fibres in the highly specialized biomedical field of wound management. Page(s): 434-450