NOPR Collection:

Electromagnetic shielding behaviour of conductive filler composites and conductive fabrics – A review

2016-07-20T05:05:15Z

Title: Electromagnetic shielding behaviour of conductive filler composites and conductive fabrics – A review Authors: Jagatheesan, Krishnasamy; Ramasamy, Alagirusamy; Das, Apurba; Basu, Ananjan Abstract: In this study, theory of EMI shielding and research conducted on textile fabrics to impart conductivity for attenuating the electromagnetic (EM) radiation by means of different techniques have been reviewed in detail. Shielding of the EM waves can be done by means of reflection, multiple reflection and absorption by the shield. Different metals with their alloys and polymeric materials are initially used as shielding materials with some limitations. However, the recent developments in conductive fabrics and composites replace the conventional shielding materials. The composites with better conductivity and light weight could be a promising barrier material for protecting electronic circuits from the EM radiation and mechanical damage. Materials with high absorption co-efficient could impart shielding effectiveness of 80 dB for the frequency of 18 GHz. This paper mainly focuses on the necessity of conductive textile fabric and composites used as hybrid electromagnetic shields. Page(s): 329-342

Comprehensive quality evaluation of jutecell/cotton blended yarn based on principal component analysis

2016-07-20T05:03:42Z

Title: Comprehensive quality evaluation of jutecell/cotton blended yarn based on principal component analysis Authors: Zhong, Zhili; Wang, Yuxin; Wu, Jianqing; Chen, Rong; Ling, Liangzhong; Zhu, Ruhua Abstract: In order to evaluate the comprehensive quality of jutecell/cotton (J/C) blended yarn more accurately and conveniently, six kinds of jutecell/cotton blended yarn with different blending ratios have been designed with linear density 20tex. The comprehensive quality indices of these six yarns have been assessed with principal component analysis including hairiness indices (1mm) and (2mm), yarn evenness, snick(-50%), slub(+50%), nep (+200%), breaking strength and breaking elongation. The rank, in terms of quality, of J/C yarns with different blending ratio is 80/20 > 100/0 > 40/60 > 60/40 > 20/80 > 0/100 whose syntheses scores are -1.67, -0.98, -0.77, -0.02, 0.76, 2.68 respectively. The blending ratio of 80/20 J/C yarns gets the highest rank in terms of quality which is due to the excellent characteristics of two kinds of fibre. The findings provide practical guidance for designing the blending ratio of jutecell/cotton blended yarn correctly. Page(s): 326-328

Properties of cotton, tencel and cotton/tencel blended ring- spun yarns

2016-07-20T05:03:01Z

Title: Properties of cotton, tencel and cotton/tencel blended ring- spun yarns Authors: Ramasamy, K A; Nalankilli, G; Shanmugasundaram, O L Abstract: Yarn characteristics of pure cotton, 67:33 cotton/tencel blend, 33:67 cotton/tencel blend and pure tencel have been studied. Blending is done at draw frame. Machinery parameters are kept constant for studying the effect of fibre parameters on yarn characteristics. It is observed that the addition of tencel increases single yarn strength significantly at the higher tencel composition. Presence of tencel improves the elongation property. Packing fraction of tencel and tencel blended yarn is found to be more than that of cotton. Swelling diameter of pure cotton yarn is found to be lower than those of pure tencel and tencel/cotton blend yarns. Hairiness (H) decreases with the addition of tencel in the blend. It is also observed that the coefficient of friction (yarn- to- metal) of blend yarn reduces with the addition of tencel fibre in the blend. Page(s): 322-325

Effect of sulfosuccinylation of corn starch on the adhesion to viscose fibres at lower temperature

2016-07-20T05:00:28Z

Title: Effect of sulfosuccinylation of corn starch on the adhesion to viscose fibres at lower temperature Authors: Li, Wei; Zhu, Zhifeng Abstract: Acid-thinned corn starch has been sulfosuccinylated to different levels of degree of substitution to study the adhesion of starch to viscose fibres at lower temperature. The sulfosuccinylated starches with a degree of substitution range 0.009 - 0.036 have been synthesized through a two-step reaction, namely starch maleation and sulfonation. The adhesion is evaluated in term of tensile force of slightly sized roving yarns. In addition, light transmittance, surface tension and retrogradation of cooked starch paste have also been measured for revealing the reason why the improvement on the adhesion is achieved. Sulfosuccinylated starch is characterized by FTIR and DSC. It is found that the sulfosuccinylation helps to overcome inherent drawback like insufficient adhesion of starch to fibres under lower temperature. The improvement is achieved through reducing the retrogradation and surface tension of cooked starch paste under lower temperature. It is recommended that the sulfosuccinylated starch is capable of being used at the temperature of about 65 °C, without significantly exhibiting the adverse influence on the adhesion when sulfosuccinylated starch has the degree of substitution value of 0.02-0.036. Page(s): 314-321