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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: 2014

An attempt has been made to investigate as well as to gain an insight on the non-dimensional parameters such as course constant (Uc), wale constant (Uw), stitch density constant (Us) and loop shape factor (Ur) of the knitted fabrics produced on a double jersey circular bed machine equipped with 1×1 rib gaiting using cotton, polyester/viscose, acrylic and polyester multifilament yarns. Fabric samples are prepared by varying the stitch cam setting, input tension, yarn count, etc. on a 16 gauge circular knitting machine and are 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. It is also found that the values of the four non-dimensional parameters such as Uc, Uw, Us and Ur follow a specific trend and are found comparable with the experimental values obtained by previous workers for cotton 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. © 2014 Indian Journal of Fibre & Textile Research. All right reserved. Source


Biswas S.K.,Institute of Jute Technology
Journal of Natural Fibers | Year: 2010

Notwithstanding the complexity of production of jute fiber filaments, a simple graphical presentation of jute fiber length distribution has been made. The computer simulation of four types of frequency distributionsof jute fiber length depending on the method of sampling and testing is presented. These four distribution curves give four modal lengths that merit technological significance. © Taylor & Francis Group, LLC. 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


Konar A.,Institute of Jute Technology | Samanta A.K.,Institute of Jute Technology | Datta M.,NJB National Jute Board | Datta S.,Jadavpur University
International Journal of Applied Engineering Research | Year: 2014

Standard 3% H2O2 bleached jute fabric, pre-mordanted with selective single and double mordants using myrobolan (harda/haritaki) and metallic salts has been dyed with aqueous extract of Catechu (a natural dye). Changes in important mechanical properties after mordanting and corresponding dyeing behavior have been evaluated in terms of instrumentally measured colour interaction parameters. 20-30% myrobolan (Harda) followed by 20-30 % of Al2(SO4)3 pre-mordanting treatment in sequence have been found to be the most potent double mordanting systems rather than corresponding individual single mordant used. With this selective dye-fibre mordant system, dyeing process variables have also been standerdised. Effects of dyeing process variables on surface colour strength and dye uniformity in the present study have indicated that the 60 min dyeing time, 90°C dyeing temperature, 12 pH, 1:5 material-to-liquor ratio, 20 -30% mordants concentration for each of the double mordant system, 50 % (on the weight of solid source material) dye concentration (Catechu), and 15 gpl common salt have been found to be the optimum dyeing condition. Colour fastness properties to washing, rubbing and light as well as dyeing-pH sensitivity for selective fibre-mordants-dye systems on colour fastness properties have also been assessed and reported. Improvement of wash and light fastness had also been achieved with specific eco-friendly chemicals for popularizing the same in export market. © Research India Publications. Source


Samanta A.K.,Institute of Jute Technology | Konar A.,Institute of Jute Technology | Chakraborti S.,Institute of Jute Technology | Datta S.,Jadavpur University
Indian Journal of Fibre and Textile Research | Year: 2011

Selective pre-mordanting (single and double) and natural dyeing of 6% H2O2 (50%) bleached jute fabric have been carried out using myrobolan (harda) and metallic salts (patash alum and aluminium sulphate) as mordants and aqueous extract of tesu (palash flower petals) as dyeing agent under varying dyeing condition to optimize the dyeing process variables. It is found that the 20 % myrobolan followed by 20 % aluminium sulphate in sequence is a most potential double pre-mordanting system rather than using them as single mordant separately, considering the results of important textilerelated properties and colour yield. Effects of dyeing process variables (time, temperature, pH, MLR, mordant conc., dye conc., and salt conc.) on surface colour strength have been evaluated to optimize dyeing conditions. Colour fastness to washing, rubbing and light, in general, and dyeing pH sensitivity, in particular, for selective fibre-mordants-dye systems have also been assessed and it is found that dyeing at pH 11 for the system offers overall good colour yield and colour fastness properties. Improvement in wash and light fastness is also achieved with suitable chemical post-treatment. Source

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