Optimization of process parameters in air-jet texturing of polyester/viscose blended yarns

213-221The effect of process parameters on properties of polyester/viscose blended air-jet textured yarns has been studied. It is observed that with the increase in texturing speed the yarn physical bulk reduces, and instability and tenacity increase. With increasing air pressure or overfeed, the physical bulk and instability increase, whereas tenacity reduces. Regression equations for the prediction of air-jet textured yarns properties have also been derived. On the basis of the regression equations the optimum process parameters for producing good quality air-jet textured yarns have been obtained, considering that the yarns with lowest instability, and high bulk and tenacity are desirable. Yarn instability is accorded the highest weightage while bulk is given intermediate and tenacity the lowest weightage in order to find out the combination of parameters that will produce yarns of low instability, high bulk and high tenacity values

Influence of material parameters and thermal treatment on structure and properties of polyester air-jet spun yarn

150-157The effect of thermal treatment (dry and wet) under slack conditions, blend ratio and fibre cross-section on the structure and properties of air-jet spun yarns has been studied. It is observed that the thermal treatment, particularly in wet condition, increases the linear density, helix angle, helix diameter, breaking extension and abrasion resistance and decreases the mean fibre extent, tenacity and flexural rigidity of the yarns. The increase in amount of coarser denier fibre exhibits higher helix diameter, mean fibre extent, yarn tenacity, breaking extension, abrasion resistance and flexural rigidity, and lower helix angle. The increase in trilobal fibre content in the blend shows increased helix diameter and mean fibre extent, and lower helix angle, yarn tenacity, breaking extension, abrasion resistance and flexural rigidity in the yarn

Effect of substituting modified polyester for cotton in ring-spun polyester/cotton blended yarn fabrics

313-319<span style="font-size: 12.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:fd2085292-identity-h;="" mso-bidi-language:ar-sa"="">The effect of using a tetra channel cross-section polyester fibre with and without microslits on its surface in place of cotton in a polyester/cotton (P/C) blended yarn fabric has been studied. The results have been compared with P/C blended yarn fabrics. It is observed that the modified cross-section polyester generally shows better performance with respect to <span style="font-size: 12.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:fd2085292-identity-h;="" mso-bidi-language:ar-sa"="">drapability, crease recovery, bending rigidity, air permeability, thermal insulation and wicking behaviour as compared to P/C blended fabrics in temperate weather. </span

Wet pretreatment of linen by enzyme and alternative bleaching techniques

150-155An attempt has been made to scour linen with a multifunctional cultured enzyme containing pectinase and xylanase. The activity level of the individual component in the enzyme is measured and then the optimum level of treatment is obtained. The removal of impurities is measured in terms of methylene blue absorption, residual lignin and absorbency. Bleaching with peroxide using sodium persulphate as activator has also been attempted along with scouring as well as a separate process. Combined scouring - bleaching although does not yield very good whiteness, the two-step pretreatment gives satisfactory results. Bleaching with KMnO4 is also effectively done but with relatively higher strength loss. For ease in interpretation, the results are analysed with polar diagrams

Effect of process parameters and blend percentage on physical properties of polyester/viscose blended air-jet textured yarns

13-16The effect of air pressure, overfeed and varying blend percentage on the properties of the polyester/viscose blended air-jet textured yarns has been studied. It is observed that at lower air pressure and overfeed levels, the increasing texturing speed reduces physical bulk and at higher texturing speed the increasing overfeed increases physical bulk. Physical bulk increases with the simultaneous increase in overfeed and air pressure and it reduces with a combination of low overfeed and high texturing speed. A combination of high texturing speed and low air pressure generates lower instability in the textured yarn

Functional properties of bamboo/polyester blended knitted apparel fabrics

231-237The functional properties of bamboo/polyester blended knitted fabrics, intended to be used for summer clothing, have been studied. It is observed that with increasing bamboo content the yarn hairiness and unevenness increase and the tenacity decreases. It is also found that the increase in bamboo content in the blend increases the ultra-violet protection factor, water vapour permeability and wickability. On the other hand, with the increase in bamboo content in the fabric there is a decrease in bursting strength, air permeability and thermal resistance. The fabrics loose their anti-bacterial property when bamboo is gradually replaced by polyester. The findings of the study suggest that polyester/bamboo blends must contain more than 80% bamboo fibres in order to retain sufficient anti-bacterial property of bamboo fibres in the fabrics

K N and Mahish S S ,Thermo physiological comfort properties of P/B blended suiting fabrics,International journal of innovative research in science,engineering and technology,vol.2,issue

Abstract; In this work ,The thermal comfort properties of polyester and bamboo blended woven fabrics have been studied in relation to %of component fibers in blends ,pick density and weave .The objective was to determine the influence of fabric factors such as the constituent fibers ,pick density and weave characteristics on the fabrics properties such as air permeability ,relative water vapour permeability ,thermal resistance ,water absorbency time and wicking .thermal comfort characteristics of plain and twill woven fabrics made of 2/30 s Ne bamboo in warp and 30 s Ne 100% bamboo ,polyester/bamboo blended yarns have been studied .The fabric characteristics such as air permeability ,thermal resistance ,relative water vapour permeability ,water absorbency time and wicking related to comfort characteristics are discussed. The experimental results show that 2/30s ne bamboo in warp direction of twill fabrics with 60picks per inch exhibits higher wick ability as well as higher relative water vapour permeability when compared to other samples. 30 s Ne polyester/bamboo (70/30) blended in weft direction of twill fabrics with 64 picks per inch show very higher thermal resistances and air permeability than other samples .And 100% bamboo in warp direction of twill fabrics with 60picks per inch show less water absorbency time than other samples

Securing sensor networks by moderating frequencies

Security of Wireless Sensor Network (WSN) is a key issue in information security. Most existing security protocols exploit various Mathematical tools to strengthen their security. Some protocols use the details of the geographical location of the nodes. However, to the best authors&rsquo; knowledge, none of the existing works exploit the constraints faced by the adversary, specifically, tracing a particular frequency from a large range of unknown frequency channels. The current work uses positional details of the individual nodes. Then the aim is to exploit this weakness of tracing frequencies by assigning a wide range of frequency channels to each node. Experiments using Magneto Optic Sensors reveal that any change of the parametric Faraday&rsquo;s rotational angle affects the frequency of the Optical waves. This idea can perhaps be generalized for practically deployable sensors (having respective parameters) along with a suitable key management scheme