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Thimma Reddy G.,Central Silk Technological Research Institute | Kathari V.P.,Central Silk Technological Research Institute | Reddy A.,Central Silk Technological Research Institute | Das S.,Regional Silk Technological Research Station
Indian Journal of Fibre and Textile Research | Year: 2011

Nineteen fabric samples of three different varieties such as dupion, soft and taffeta silk have been produced and tested for stretch and growth properties in both dry and wet conditions. It is observed that stretch and growth properties of silk fabrics are correlated with cover factor, fabric thickness, fabric warp crimp and twist significantly. The increase in stretch and growth properties of fabric in wet condition may be due to more swelling and relaxation of fibre structure and also attributed to breaking of hydrogen bond chain links in protein fibre.

Munshi R.,Regional Silk Technological Research Station | Das D.,University of Calcutta | Chowdhuri A.,University of Calcutta
Journal of the Textile Institute | Year: 2014

Jute fabric was modified using polyacrylic rubber as finishing agent in the presence of NH4Cl, MgCl2 and sodium salts of phosphoric acid as catalysts, employing a pad-dry-cure technique. Treatment with 10% polyacrylic rubber in the presence of 2.25% Na4P2O7, followed by drying of the padded fabric at 95°C for 5 min and curing of the dried fabric at 140°C for 5 min produced the most balanced improvements in properties, such as tear strength, flexibility, tensile strength elongation at break, moisture regain, abrasion resistance and wrinkle recovery. Functional group analysis and IR spectroscopy indicated that Na4P2O7 catalyst allowed esterification of carboxyl groups of polyacrylic rubber with the cellulose constituents of jute and the said process ultimately led to some degree of cross-linking of the chain polymers of jute. © 2013 The Textile Institute.

Padaki N.V.,Regional Silk Technological Research Station | Alagirusamy R.,Indian Institute of Technology Delhi | Deopura B.L.,Indian Institute of Technology Delhi | Fangueiro R.,University of Minho
Journal of Industrial Textiles | Year: 2010

Structure property correlation is a critical textile research area explored by various researchers and many factors have been proposed over the years to predict/compare/design the woven fabrics. Cross-over firmness factor (CFF) and floating yarn factor (FYF) have been recently proposed as parameters to understand weave effect on fabric properties (Morino, H., Matsudaira, M. and Furutani, M. (2005). Predicting Mechanical Properties and Hand Values from the Parameters of Weave Structures, Textile Research Journal, 75(3): 252-257). Redefined CFF and FYF factors using fabric fields in terms of interlacement index (I) and float index (F), respectively have been proposed in this article. This new approach provides better understanding of the interlacements and floats in the woven structure and further they are applied on multilayer interlocked fabrics to quantify the structural influence on the properties. Multilayer interlocked woven fabrics with different interlacement patterns have been developed. Influence of fabric structure on preform properties relevant for resin transfer molding composite manufacture, such as compression, permeability, and tensile behavior were studied with respect to the interlacement and float indices. Tensile and compression tests were conducted on universal testing machine. Liquid permeability of these structures was evaluated based on horizontal wicking and contact angle wettability tests. Results show that influence of structural factor is greater on tensile and permeability properties than the compression properties of these multilayer fabrics. © The Author(s), 2010.

Padaki N.V.,Regional Silk Technological Research Station | Alagirusamy R.,Indian Institute of Technology Delhi | Deopura B.L.,Indian Institute of Technology Delhi | Fangueiro R.,University of Minho
Journal of Industrial Textiles | Year: 2010

Impact property of composite material is influenced not only by the type of fiber/matrix, but also by the woven structure of the reinforcement. Presence of 3D fibers in reinforcement is reported to enhance the performance of textile composites in an impact event. This article attempts to study the influence of interlacements in the multilayer woven interlocked 3D structures on the impact properties of the composite material reinforced with them. Low velocity impact testing was carried out on an instrumented drop weight impact tester to obtain load-elongation-time plots of the impact event. It has been observed that increased interlacement in the structure improves the impact resistance of the multilayer textile composites. Further, damage area maps have been developed to understand and analyze the interlacement effect on the impact behavior. © The Author(s), 2010.

Chattopadhyay D.,Regional Silk Technological Research Station | Munshi R.,Regional Silk Technological Research Station | Padaki N.V.,Regional Silk Technological Research Station | Mishra S.N.,Regional Silk Technological Research Station | Roy S.,CSTRI
Indian Silk | Year: 2010

The cost of production and quality level that can be achieved for manufacturing eri silk yarn by using amber charka technique in India is discussed. The two methods are followed for eri spinning using amber charka after degumming and drying process that includes without carding and with carding. For one kg of eri cocoon used for the spinning process, degumming loss is 120g, waste generated in the spinning process is 50g and invisible losses are 30g. The total cost of eri silk yarn for 800 g is Rs 688, and the cost per kg of yarn works out to Rs 860. The modifications that are required in order to obtain better output and quality of eri spun silk yarns includes the use of long staple drafting system in amber charka and the use of either pedal operating or motor driving system in amber charka. The use of pedal operating or motor driving system help the operator to piece the yarn during end break without stopping the machine that improves the production and the daily wages of artisans.

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