Institute of Jute Technology

Kolkata, India

Institute of Jute Technology

Kolkata, India
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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.


Mukhopadhyay A.,Institute of Jute Technology | Neogi S.K.,Institute of Jute Technology
Man-Made Textiles in India | Year: 2011

Fabric assistance indicates the rise in breaking strength of the constituent threads of a fabric as a result of interlacement. AlthStudy of fabric assista application, scanty knowledge on this has incited undertaking a study to examine the effects of count and pick density of the weft yarns on warp and weft way fabric assistance of plain jute fabrics. While the weft way fabric assistance has always been found to be positive, the warp way fabric assistance is positive when the warp way strengths of the fabrics are compared against the strength of the constituent warp yarns after removing the weft yarns from the woven structure.


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.


Samanta A.K.,Institute of Jute Technology | Bagchi A.,Institute of Jute Technology | Biswas S.K.,Institute of Jute Technology
Journal of Polymer Materials | Year: 2011

Bleached jute fabrics have been subjected to treatment with different fire retardant formulations based on binary mixtures of Phosphorous - Nitrogen compound by pad-dry cure process. Phosphorous containing compound e.g., Ortho Phosphoric Acid/DAP and Nitrogenous compound e.g. Urea/ThioUrea/Dicyan-diamide as well as a commercial fire retardant finishing agent, Pyrovatex CP (N-methylol di methyl phosphonopropionamide) are also standardized and studied for jute fabric. The fire retardant performance of each formulation is investigated at different concentration in terms of LOI value, flame spread time, afterglow time, char length. The effect of fire retardant treatments on the various physical properties were also measured. Most of the fire retardant formulations showed high fire retardant performance showing LOI value in the range of 27 to 38. Ortho Phosphoric Acid in combination with Urea imparts highest fire retardancy though it is also associated with higher strength loss. However, all the above fire retardant finished fabric samples showed loss of nearly 20- 30% of LOI value on soap washings Loss oftenacityon such fire retardant treatment was around 15-50% in different cases. Thermal studies showed that on fire retardant treatment formation of volatile products are reduced. © MD Publications Pvt. Ltd.


Samanta A.K.,Institute of Jute Technology | Biswas S.K.,Institute of Jute Technology | Bagchi A.,Institute of Jute Technology | Bhattacharyya R.,Institute of Jute Technology
Journal of the Institution of Engineers (India), Part TX: Textile Engineering Division | Year: 2011

Bleached jute fabrics have been subjected to treatment with six different fire retardant formulations based on combination of diammonium phosphate (DAP), mixture of borax-boric acid (7:3), tetra-sodium pyrophosphate, sodium per-borate with or without DMDHEU (resin) and MgCI 2(catalyst) by pad-dry cure process for imparting semi-durable fire retardant finish on it. The fire retardant performance of each formulation investigated and were compared with the same for a commercial fire retardant finishing agent (Pekoflame DPN) in terms of LOI value, flame spread time, afterglow time, char length and changes in tenacity, breaking elongation, bending length, flexural rigidity, and surface appearance in terms of K/S value, whiteness index, yellowness index and brightness index. Most of the fire retardant formulations showed moderate fire retardant performance showing 27-33 LOI value where highest LOI value (33.0) was achieved by formulation 5. However, all the above fire retardant finished fabric showed loss of nearly 15%-20% of LOI value on soap washing. Loss of tenacity on such fire retardant treatment was around 15%-40% in different cases. Thermal behaviour by analysis of DSC thermograms, TGA thermograms and thermal resistivity value (Clo and Tog value) of the experimental fabrics showed that formulation 5 [based on treatment with mixture of 12% sodium perborate 12%, 12% borax plus boric acid (7:3), DAP 4% and 4% DMDHEU with 1% MgCI2] catalyst gives maximum Clo-Tog values, minimum weight loss during heating at ambient of 500°C at different temperature zones as well as somewhere a bit early and somewhere a bit delayed thermal degradation/pyrolysis of major jute constituents showing a different thermal behavior pattern than control bleached jute fabric.


Samanta A.K.,Institute of Jute Technology | Konar A.,Institute of Jute Technology | Chakraborty S.,Institute of Jute Technology | Datta S.,Jadavpur University
Journal of the Institution of Engineers (India), Part TX: Textile Engineering Division | Year: 2010

Standard 3% H 2O 2 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 manjistha (a natural dye). Changes in important mechanical properties after mordanting and corresponding dyeing behaviour have been evaluated in terms of instrumentally measured colour interaction parameters. Rather than corresponding individual single mordant used, 20% myrobolan (Harda) followed by 20 % of AI 2(S0 4) 3 pre-mordanting treatment in sequence have been found to be the most potent double mordanting systems. 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, 11 pH, 1:20 material-to-liquor ratio, 20% mordants concentration for each of the double mordant system, 50 % (on the weight of solid source material) dye concentration (manjistha), and 10 g/l 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.


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.


Samanta A.K.,Institute of Jute Technology | Konar A.,Institute of Jute Technology | Agarwal P.,Institute of Jute Technology | Datta S.,Jadavpur University
Journal of Polymer Materials | Year: 2010

Conventional 3% H2O2 bleached jute fabric was initially pretreated with 0.5% -2.0% K2S2O8 under limited aqueous system using pad-batch/pad-dry process, to produce different degree of oxidised jute fabric (oxy-jute) having adequate number of aldehyde/di-aldehyde functional groups showing copper number 4.9 to 6.7(from copper number 2.6 of bleached jute) depending on the K2S 2O8 concentration and its conditions of treatment. This oxy-jute substrate was further treated by paddry-cure process with different percentages of phenyl hydrazine, hydrazine hydrate and ethylene di-amine for generating -NH2 and ultimately -NH3 + or other cationic groups for cationization of jute to obtain an improved balance of its mechanical properties, chemical reactivity and dyeability as well. This part of the present study includes a thorough investigation of the changes in weight loss or gain and important textile related properties such as breaking tenacity, breaking extension, initial modulus, moisture regain, bending length, bending modulus, flexural rigidity, total crease recovery, whiteness Index, yellowness index, brightness index etc. to understand the effects of such chemical modifications on its selective textile related properties. It was observed that on treatment of oxy-jute ( K2S2O8 pre-treated) substrate with phenyl hydrazine, hydrazine hydrate and ethylene di-amine, there is increase in weight gain, some improvement in crease recovery angle, reduction in bending length and flexural rigidity in spite of some loss in tensile strength and reduction in moisture regain for all the three agents used. For these treatment, there is measureable reduction in reactive dye uptake while reverse is true for acid dyes. For four different natural dyes, 10% phenyl hydrazine treatment show higher depth of shade with acceptable overall colour fastness for each dye followed by 8% ethylene di-amine treated jute, whereas, the effect of improving dyeability is minimum for hydrazine hydrate treated jute. Analysis of DSC thermograms of such chemically modified jute indicates that ethylene di-amine (EDA) treated jute show noticeable thermal stability for all the three jute constituents (cellulose, hemicelluloses and lignin). Study of surface morphology of the said chemically modified jute substrate indicate the © MD Publications Pvt. Ltd.


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.


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.

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