NOPR Collection:

Comparative assessment of Eli-Twist and TFO yarns

2018-12-17T09:59:44Z

Title: Comparative assessment of Eli-Twist and TFO yarns Authors: Regar, Madan Lal; Sinha, S K; Chattopadhyay, R Abstract: An attempt has been made to compare the properties of Eli-Twist yarn with those of conventional TFO yarn. Yarns of three compositions (100% Polyester, 50/50 Polyester/Cotton and 100% Cotton) were produced on Eli-Twist and ring spinning systems. Three different counts (39.4tex, 29.5tex and 23.6tex) from each composition have been produced, maintaining 40 twist factor for all the yarns. Hairiness, tensile strength, breaking extension, diameter, abrasion resistance and coefficient of friction have been measured and then compared with those of conventional ring-spun TFO yarn. The mass irregularity and imperfections are found more or less similar in both the yarns, while Eli-Twist yarn exhibits higher breaking strength and breaking extension. Both coefficient of friction and abrasion resistance of Eli-Twist yarn are found to be low as compared to ring- spun TFO yarn. Page(s): 393-401

Design and development of an instrument for testing electrical insulation of technical textiles

2018-12-17T09:57:05Z

Title: Design and development of an instrument for testing electrical insulation of technical textiles Authors: Sengupta, Anindita; Debnath, Sanjoy; Sengupta, Surajit Abstract: An attempt has been made to develop an instrument to measure the electrical insulation of technical textiles. Developed digital instrument measures resistance in terms of Mohm/Gohm in the transverse direction of textile material up to 2 cm thickness with 99.6% accuracy. The same sample has been tested 30 times and the deviation between minimum and maximum values is found insignificant at 1% confidence level. This instrument is user friendly, low cost, precise and easy to calibrate. Some tests using developed instrument show that the electrical resistance of fabric decreases with the increase in temperature, moisture content and area density of fabric. The electrical resistances, however, increases with thickness of fabric. The instrument is useful to understand the suitability of fabric for electrical insulating products like gloves, jackets, floor-covering, etc. Page(s): 402-409

Comparison of fibre migration in different yarn bodies

2018-12-17T09:54:40Z

Title: Comparison of fibre migration in different yarn bodies Authors: Yang, Jing; Xu, Bojun; Xie, Chunping; Liu, Xinjin Abstract: The qualities of yarn have been studied by analyzing the fibre migration in the yarn body. The effects of spinning method and raw fibre property on fibre migration have been studied using the tracer fibre technique. Compact-spun (60s Ne), ring-spun (60s and 10s Ne) and rotor-spun (10s Ne) (cotton) yarns have been prepared. However, for the compact-spun yarns, both pure cotton and polyester/cotton blended yarns have been prepared. Two mixing steps have been used, namely (i) the dyed cotton fibre mass is homogeneously mixed with the undyed cotton fibre mass by hand, and (ii) the mixed fibre agglomerates are then subjected to carding to obtain a more uniform mixture. Finally, five sets of yarns are obtained through the consequent spinning process. Fibre measuring system is used to watch the movement of tracer fibres and to get the migration parameters as well as their envelope lines. The results show that the fibre migration of the ring spinning yarn is the most obvious, followed by the compact spinning yarn. The rotor spinning yarn has so many wrapped structures that the fibre migration is not obvious. Polyester/cotton blended yarn, which has better yarn levelness, higher breaking strength and less hairiness, shows higher degree of fibre migration than the yarn made of pure cotton. Page(s): 410-414

Designing terry fabric for improved serviceability

2018-12-17T09:51:49Z

Title: Designing terry fabric for improved serviceability Authors: Singh, J P; Behera, B K Abstract: Various terry fabrics (cotton) having different constructional parameters have been designed and the effect of washing treatment on water absorbency, surface characteristics and compression characteristics are studied. To establish the optimum loop length and loop density of terry fabrics at which they can withstand maximum number of washing cycles without affecting water absorbency, surface characteristics and compression characteristics, terry fabrics having the same yarn and fabric parameters are washed under industrial conditions for 10 washing cycles. After each cycle, the rate of water absorption, total amount of water absorbed, surface characteristics and compression characteristics are evaluated by gravimetric absorbency testing system, image analysis techniques and KES-FB-3 testing system respectively. Another group of cotton terry fabrics having different loop length and loop density have been studied to optimise these two important fabric parameters to increase the life of fabric. It is observed that the rate of water absorption, the total amount of water absorbed and the surface characteristics improve with increase in washing cycle, but after 8^th washing cycle these parameters start deteriorating. Maximum possible loop density and loop length of 15 - 17 mm give maximum life of terry fabric i.e. the fabric can perform well even after 10 washing cycles. This study will certainly help in increasing the life of terry fabric, developing high quality towel fabric by providing information on absorbency, surface characteristics and compression characteristics of fabric before and after washing along with the values of loop length and loop density. Page(s): 415-420