NOPR Collection:

Study of cotton ring-and compact-spun yarn fabrics: Part I –Effects of spinning variables on hand-related characteristics

2010-03-23T16:30:49Z

Title: Study of cotton ring-and compact-spun yarn fabrics: Part I –Effects of spinning variables on hand-related characteristics Authors: Tyagi, G K; Bhattacharyya, S; Bhowmick, M; Narang, R Abstract: The importance of yarn structural variants such as spinning draft, twist factor, yarn structure, and spindle speed in deciding the hand-related characteristics of woven cotton fabrics has been investigated using FAST evaluation system. The data indicate that the processing differences of each yarn type confer different extensibility, bending rigidity and shear rigidity values, and the differences in the yarn structure affect the fabric formability and other low deformation characteristics. Effects obtained by changing twist factor and spinning draft are found to be significant; however, by using an optimum spinning draft and varying twist factor, one can successfully produce fabrics with low rigidities and quite sufficient extensibility and formability. The spindle speed does not seem to affect the coercive shear rigidity in either ring- or compact-spun yarn fabrics. The handle response of fabrics woven with compact-spun yarns is quite satisfactory in many respects. Page(s): 45-49

Effect of spinning conditions on mechanical and performance characteristics of cotton ring- and compact-spun yarns

2010-03-23T16:30:48Z

Title: Effect of spinning conditions on mechanical and performance characteristics of cotton ring- and compact-spun yarns Authors: Tyagi, G K; Bhowmick, Manik; Bhattacharyya, S; Kumar, R Abstract: The effect of spinning conditions on the structural, mechanical and low -stress response of cotton ring- and compact-spun yarns has been studied. Spinning conditions include spinning draft, twist factor, yarn tex and spindle speed. Generally, the compact- spun yarns display higher mean migration intensity and lower values of mean fibre position, helix angle and helix diameter. It is also observed that the yarn structures produced under various spinning conditions yield different performance characteristics and the differences are quite meaningful; however, using appropriate twist factor and varying spindle speed, one can successfully spun yarns with less hairiness, better abrasion resistance, and quite sufficient structural integrity and compressional energy. An optimal spinning draft is required if the optimum level of structural integrity, compressional energy, compressional resilience and abrasion resistance of a yarn needs to be achieved for a specific end-use. The behaviour of compact-spun yarns is noticeably better in respect of tensile strength, work of rupture, abrasion resistance, hairiness and mass irregularity. Page(s): 21-30

Recent innovations in loom shedding mechanisms

2010-03-24T16:30:17Z

Title: Recent innovations in loom shedding mechanisms Authors: Gokarneshan, N; Jegadeesan, N; Dhanapal, P Abstract: The critical analysis of the recent research developments in the loom shedding mechanisms has been reported. The use of angle shedding disks without dynamic warp loading in multi-phase weaving machines enables to weave higher pick densities and difficult varieties of fabrics. Other researches have been directed towards more effective heald movements and better design of shedding cams. The paper also highlights the various developments related to these areas and provides scope for further research in the shedding mechanisms. Page(s): 85-94

Synthesis of spray dried polyvinyl pyrrolidone coated silver nanopowder and its application on wool and cotton for microbial resistance

2010-03-24T16:30:24Z

Title: Synthesis of spray dried polyvinyl pyrrolidone coated silver nanopowder and its application on wool and cotton for microbial resistance Authors: Raja, A S M; Thilagavathi, G; Kannaian, T Abstract: Silver nanoparticle - polyvinyl pyrrolidone (PVP) composite containing 100 ppm of silver has been synthesized in powder form for textile applications, using sono-chemical method comprising sonication and reduction with trisodium citrate followed by spray drying. The synthesized PVP coated silver nanopowder is then characterized by UV-Visible spectra, atomic absorption spectra, transmission electron microscope and energy dispersive analysis of X-rays. The results indicate the presence of silver particle of the size 50-60 nm in the synthesized powder. The silver nanopowder has been applied on cotton and wool to impart antimicrobial efficacy by exhaustion method. The treated cotton fabric shows a clear microbial resistance with 35-40 mm zone of inhibition in the agar diffusion test against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. The treated wool fabric shows 100%, 97% and 99% antimicrobial efficacy in the quantitative AATCC 100 test against the above-mentioned microorganisms respectively. Page(s): 59-64