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Mahish S.S.,Indian Institute of Technology Delhi | Punj S.K.,Indian Institute of Technology Delhi | Kothari V.K.,The Technological Institute of Textile and science
Fibers and Polymers | Year: 2010

The effect of blend percentage on comfort and handle related properties of fabrics made from polyester/viscose blended air-jet textured yarn weft were studied and the results were compared with fabrics made from polyester/viscose ring-spun yarn wefts of similar linear densities. It is observed that with increase in polyester content in the blend, the air permeability and water vapour permeability reduces whereas thermal resistance, transverse wicking and shear rigidity increases both in ring-spun yarn and textured yarn fabrics and bending rigidity increases in textured yarn fabrics. Textured yarn fabrics exhibit lower air permeability and extensibility, higher thermal resistance, relative water vapour permeability, transverse wicking values and bending rigidity as compared to the ring-spun yarn fabrics. © 2010 The Korean Fiber Society and Springer Netherlands. Source

Mukherjee S.,National Institute of Fashion Technology | Ray S.C.,Institute of Jute Technology | Punj S.K.,The Technological Institute of Textile and science
Indian Journal of Fibre and Textile Research | Year: 2012

An attempt has been made to investigate as well as to gain an insight on the non-dimensional parameters such as Uc, Uw, Us and Ur of the knitted fabrics produced on a double jersey flat bed machine using acrylic yarn. Fabric samples have been prepared by varying the stitch cam setting, take down load and yarn count in a 5.5 gauge flat bed knitting machine and then subjected to relaxation treatment by using conventional technique as well as mechanical energy of ultrasonic waves for maximum shrinkage. It is observed that this new relaxation technique produces similar dimensional and non-dimensional parameters of the fabric as obtained with the conventional relaxation treatments. The values of the four non-dimensional parameters such as Uc, Uw, Us and Ur follow a specific trend and these values are found to be comparable with the experimental values obtained by previous workers for fabrics knitted in circular knitting machine. Regression analyses have been made and regression equations are generated to study the effect of loop length on courses and wales (ribs) per cm at different stages of relaxation. Source

Kothari V.K.,Indian Institute of Technology Delhi | Dhamija S.,The Technological Institute of Textile and science
Journal of the Textile Institute | Year: 2010

The present study reports the effect of linear densities and profiles of polyester fibres on the physiological properties of their fabrics. Four different polyester fibre finenesses along with microdenier and four cross-sectional shapes (circular, scalloped oval, tetrakelion and trilobal) were selected to produce two sets of 2/1 twill fabrics; one composed of 100% polyester and the other 67:33 P/V blends. In studying the thermophysiological component of the clothing comfort, heat, air and moisture transmission characteristics of the fabrics were assessed. The principal thermal properties, such as thermal absorptivity, thermal resistance and thermal conductivity, were experimentally evaluated, using the Alambeta instrument. The study of the obtained results established the fabrics of non-circular cross-sections as against circular ones, and increase in the linear density results in higher thermal resistance, lower thermal conductivity and lower thermal absorptivity. Wicking behaviour of fabrics was studied under two conditions-wicking from an infinite liquid reservoir (transverse wicking) and wicking from a finite liquid reservoir (single drop wicking into the fabrics). Increase in fibre linear density enhances transplaner wicking but slows down the spreading speed of water drops. Air permeability and moisture vapour permeability are found to be positively correlated with fibre decitex. The role of fibre cross-sectional shapes in influencing mass-flow characteristics is quite considerable. Use of non-circular polyester in place of a circular one augments the wickability of liquid water along with the permeability of air and moisture vapour through the fabrics, revealing their high porosity, which assists air and moisture to propagate. Mixing viscose into polyester brings down the air permeability and moisture vapour transmission rate (MVTR) of fabrics. Results show that moisture absorption of viscose is an important factor in influencing the moisture transport characteristics including both wickability and MVTR of 100% viscose and P/V-blended fabrics. © 2010 The Textile Institute. Source

Tyagi G.K.,The Technological Institute of Textile and science | Goyal A.,The Technological Institute of Textile and science | Chattopadhyay R.,Indian Institute of Technology Delhi
Indian Journal of Fibre and Textile Research | Year: 2013

The low-stress and recovery properties of ring, rotor and MJS yarns spun from tencel-polyester and tencel-cotton fibre mix have been studied. In comparison with ring and MJS yarns, rotor-spun yarns are more bulky, possess low tensile energy and resilience, lower immediate elastic recovery and have higher delayed elastic recovery and permanent deformation. Ring- spun yarns, on the other hand, possess least decay but behave poorly during abrasion test for 200 cycles. An increase in tencel content in both tencel-polyester and tencel-cotton mixes produces a compact yarn with reduced abrasion resistance, structural integrity and tensile resilience, poor recovery properties, and higher tensile energy. Generally, tencel-polyester yarns display better low-stress characteristics, except the abrasion resistance. Recovery properties have been found to significantly deteriorate with the increase in amplitude of extension regardless of yarn structure. Source

Mahish S.S.,The Technological Institute of Textile and science | Punj S.K.,The Technological Institute of Textile and science | Kothari V.K.,Indian Institute of Technology Delhi
Indian Journal of Fibre and Textile Research | Year: 2010

The 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. Source

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