NOPR Collection:

Characterization of fabric bending behavior: A review of measurement principles

Mon, 01 Dec 2003 00:00:00 GMT

Title: Characterization of fabric bending behavior: A review of measurement principles Authors: Ghosh, Tushar K; Zhou, Naiyue Abstract: Various methods and the underlying principles to evaluate the bending characteristics of fabrics and fabric-like membranes are described. In comparing various methods, their limitations as well as utilities are also discussed. It has been observed that a number of relatively simpler methods produce a wealth of information useful in designing fabric structures and determining their appropriate applications. Page(s): 471-476

In-situ peracetic acid bleaching of jute

Mon, 01 Dec 2003 00:00:00 GMT

Title: In-situ peracetic acid bleaching of jute Authors: Chattopadhyay, D P; Sharma, J K; Chavan, R B Abstract: Bleaching of jute with peracetic acid formed in-situ in bleach bath has been studied. It is observed that in an unbuffered system, the bleach bath pH drops from its initial set value. This drop in pH is found to be maximum for initial bath pH of 7. This suggests that a buffer medium is required for the bleaching of jute with peracetic formed in-situ by the reaction of acetic anhydride and hydrogen peroxide. Excellent bleaching of jute with relatively higher loss in strength is possible by peracetic acid bleaching followed by bleaching with unreacted hydrogen peroxide of in-situ peracetic acid bleach bath . A low temperature (30°C) peracetic acid bleaching using 68 m moles /L acetic acid and 74 m moles/L hydrogen peroxide (30%) shows quite high degree of whiteness in jute with lesser damage. Page(s): 456-461

Measurement of yarn tension and its on-line monitoring

Mon, 01 Dec 2003 00:00:00 GMT

Title: Measurement of yarn tension and its on-line monitoring Authors: Bhattacharyya, Satyaki; Mondal, S; Pal, S Abstract: Yarn tension in winding zone of dref-III machine has been measured by interfacing the Rothschild tensiometer with computer. A software in Qbasic has been developed for on-line measurement of yarn tension. The yarn tension variation during yarn forming in dref-III friction spinning by placing the sensor at the appropriate place has also been evaluated. It is observed that in certain zone where the tension variation is very high, it is convenient to use the software by changing the resolution of AD card. The average tension increases with the increase in spinning drum speed and the on-line graphical representation of the same can be obtained by computer programming using the Qbasic language. Page(s): 418-422

Pseudo single-bath process for ambient temperature bleaching and reactive dyeing of jute

Mon, 01 Dec 2003 00:00:00 GMT

Title: Pseudo single-bath process for ambient temperature bleaching and reactive dyeing of jute Authors: Chattopadhyay, S N; Pan, N C; Day, A Abstract: Grey jute fibre has been bleached at ambient temperature using hydrogen peroxide and then cold dyed with Procion Red M8B and Remazol Yellow FG dyes by four different process sequences, namely conventional two-step process, true single-bath process, pseudo single-bath process and pseudo single-bath process using spent bleach bath. The effect of process sequences on colour yield of dyed jute fibre has been evaluated using computer colour matching system. It is observed that the colour yield by pseudo single-bath process is well comparable with that of the conventional two-step ambient temperature bleaching and cold reactive dyeing process. It is also observed that the colour yield is maximum in case of pseudo single-bath process and minimum in case of true single-bath process. The process of dyeing has no effect on λ_max value which confirms no alteration in the hue and tone of any sample dyed with reactive dye by different single-bath processes. The wash fastness is satisfactory in all the processes. Page(s): 450-455