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Shekar R.I.,Defence Bio Engineering and Electro Medical Laboratory | Rao P.M.D.,Central Silk Technological Research Institute | Padaki V.C.,Defence Bio Engineering and Electro Medical Laboratory | Kim N.H.,Chonbuk National University | Lee J.H.,Chonbuk National University
Advanced Materials Research | Year: 2010

The extruded poly ether ether ketone (PEEK) and glass fibre were used to obtain the co-woven hybrid fibre fabrics and converted into composites using compression moulding technique. The effect of shear stress and shear rate on the shear viscosity of PEEK was investigated to optimise the process conditions for converting hybrid fabrics into composites. The mechanical properties such as flexural strength and inter laminar shear strength (ILSS) as a function of number of layers of fabric have been evaluated. Low velocity (2.1 m/s) repeated drop weight impact tests were carried out on the fabricated composites at 5 and 10 J incident energy. Dielectric properties as a function of temperature and frequency have been carried out. Flammability behaviour of composites has been carried out using cone calorimeter. The data generated shows that glass-PEEK based composites are excellent potential materials for advanced structural composites. © (2010) Trans Tech Publications.


Chattopadhyay D.,Central Silk Technological Research Institute | Chakraborty A.,Government College of Engineering and Textile Technology , Berhampore | Chatterjee S.M.,Government College of Engineering and Textile Technology , Berhampore | Chatterjee S.M.,Bengal Engineering and Science University
Journal of the Textile Institute | Year: 2016

Degumming of eri silk cocoons was carried out using three different concentrations of sodium carbonate and neutral soap along with three different duration of boiling following Box and Behnken design of experiment. Higher amount of degumming loss was observed with more sodium carbonate concentration and duration of boiling for both white and brick red eri silk cocoons. Single fibre tenacity decreases with increase of sodium carbonate concentration as well as duration of boiling. Breaking elongation is affected only by sodium carbonate. Presence of neutral soap has no impact on degumming loss and single fibre tensile characteristics. About 10% sodium carbonate and neutral soap concentration each along with 1-h boiling time facilitates uniform degumming of eri silk cocoons. Degumming loss of about 10% was found without any significant deterioration of single fibre tensile characteristics. © 2016 The Textile Institute


Das S.,Central Silk Technological Research Institute | Ghosh A.,Government College of Engineering and Textile Technology , Berhampore
Journal of Applied Polymer Science | Year: 2010

The physical properties and residual sericin content of the silk filament were evaluated in relation to its position in different layers of the cocoons corresponding to Daba (Antheraea mylitta), oak tasar (Antheraea proylei), and bivoltine mulberry (Bombyx mori) varieties. A decrease in filament linear density from the outer to the innermost layers was observed in all the varieties. Although the filament tenacity was found to increase in bivoltine mulberry cocoons from the outer to the inner layers, no such specific trend was observed for Daba cocoons. For oak tasar cocoons, it showed a marginal rise. A similar trend was observed for filament initial modulus also. The breaking extension of filament was constant for Daba cocoons, decreased for oak tasar cocoons and showed a rise followed by a fall for bivoltine mulberry cocoons from the first to the last layers. The residual sericin decreased marginally from the outer to the inner layer in the case of tasar cocoons. However, for mulberry cocoons it decreased rapidly initially up to the fourth layer and thereafter showed no change. © 2010 Wiley Periodicals, Inc.


Naik S.V.,Central Silk Technological Research Institute | Somashekar T.H.,Flat 302
Indian Journal of Sericulture | Year: 2013

The effect of cocoon cooking condition on cocoon filament unwinding tension, reeling characteristics and quality of raw silk has been studied in the case of Indian multi-bivoltine (Cross breed) cocoons. Cocoons were cooked to different cooking degree by adopting different cooking methods. Cocoon cooking conditions have significant correlation with reeling tension, reeling characteristics and quality of raw silk. Cocoon cooking conditions influence the swelling and softening of sericin of cocoon filament layers and crossover points in the cocoon shell and hence the filament unwinding tension. This in turn influences the reeling tension. Further, cocoon cooking conditions influence significantly the reeling characteristics and quality of raw silk. From the results, it can be inferred that under given reeling conditions, reeling tension will give an indication about the cocoon cooking conditions and this could be utilised for process control in the filatures. Further, it is observed that pressurized cooking method gives significantly better reeling characteristics and quality of silk as compared with single pan cooking method.


Bhat P.N.,Central Silk Technological Research Institute | Nivedita S.,Central Silk Technological Research Institute | Roy S.,Central Silk Technological Research Institute
Indian Journal of Fibre and Textile Research | Year: 2011

Silver nanoparticles have been synthesized by the reduction of silver nitrate with sodium borohydride in an aqueous medium. The silk protein sericin, extracted from the cocoons of Bombyx mori silkworms, has been used as an effective capping agent. The stability of the colloidal suspension is confirmed by zeta potential measurement. The nanoparticles have been characterized by UV-vis spectroscopy, SEM and TEM analyses. They are found to be fairly spherical particles of average size 15nm. These particles also exhibit antimicrobial properties when applied onto silk fabric without significantly changing the colour of the fabric.


Das S.,Central Silk Technological Research Institute
Journal of Natural Fibers | Year: 2011

The physical properties, density, and birefringence of the cocoon filament from daba (Antheraea mylitta), oak tasar (Antheraea proylei), and bivoltine mulberry (Bombyx mori) varieties were evaluated in relation to its position in different layers of the cocoon. A decrease in filament size from the outer to the innermost layers was observed in all the varieties. Though the average tenacity was found to increase in bivoltine mulberry cocoons from the outer to the innermost layers, no such specific trend was observed for daba cocoons. For oak tasar cocoons, it showed a marginal rise. A similar trend was observed for modulus also. The breaking extension was constant for daba cocoons, decreased for oak tasar cocoons, and showed a rise followed by a fall for bivoltine mulberry cocoons from the first to the last layer. However, for mulberry cocoons, it decreased fast initially up to the fourth layer and thereafter showed no change. Density showed a marginal rise at the inner layers for daba, oak tasar, and bivoltine mulberry varieties. Birefringence remains constant at outer layers and then rises for oak tasar. In case of daba cocoons, birefringence remains constant in outer and middle layers but after that there is a rise. A steady rise in birefringence values for the innermost layers was observed from the constant values of outer layers for bivoltine mulberry cocoons. © Taylor & Francis Group, LLC.


Ramaiah G.B.,Central Silk Technological Research Institute | Chennaiah R.Y.,Central Silk Technological Research Institute | Satyanarayanarao G.K.,Bangalore University
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2010

Kevlar 29 is a class of Kevlar fiber used for protective applications primarily by the military and law enforcement agencies for bullet resistant vests, hence for these reasons military has found that armors reinforced with Kevlar 29 multilayer fabrics which offer 25-40% better fragmentation resistance and provide better fit with greater comfort. The objective of this study is to investigate and develop an artificial neural network model for analyzing the performance of ballistic fabrics made from Kevlar 29 single layer fabrics using their material properties as inputs. Data from fragment simulation projectile (FSP) ballistic penetration measurements at 244 m/s has been used to demonstrate the modeling aspects of artificial neural networks. The neural network models demonstrated in this paper is based on back propagation (BP) algorithm which is inbuilt in MATLAB 7.1 software and is used for studies in science, technology and engineering. In the present research, comparisons are also made between the measured values of samples selected for building the neural network model and network predicted results. The analysis of the results for network predicted and experimental samples used in this study showed similarity. © 2009 Elsevier B.V. All rights reserved.


Khatoon J.,Central Silk Technological Research Institute | Vasumathi B.V.,Central Silk Technological Research Institute | Basu A.,Central Silk Technological Research Institute
Indian Journal of Fibre and Textile Research | Year: 2012

The ability of silk yarns to take up twist without deterioration has been studied in terms of breaking twist angle. The study has brought to focus certain important aspects with regard to the torsional rigidity and the brittleness of silk yarns. It is observed that the brittleness of bivoltine is significantly higher than that of multibivoltine. The denier of raw silk has a significant bearing on its brittleness. Coarser deniers exhibit higher brittleness in the case of both multibivoltine and bivoltine. It is also observed that the brittleness of non-mulberry silk is significantly different from that of mulberry silk for a given denier. Muga has the lowest brittleness, tasar is next lower and mulberry raw silk has the highest brittleness. Thus, non-mulberry silks have a better ability to take twists without being affected.


Kathari V.P.,Central Silk Technological Research Institute | Patil B.G.,Central Silk Technological Research Institute | Das S.,Central Silk Technological Research Institute
Indian Journal of Fibre and Textile Research | Year: 2010

A new energy efficient process has been developed with solar water heating system for multiend silk reeling, and the energy consumption for cooking and reeling operations is calculated and compared with conventional process. It is found that in conventional process, on an average 570 L and 1000 L of water is consumed for cocoon cooking and reeling basins respectively for the production of 10 kg raw silk in 10 basin multiend reeling unit; hence, a huge amount of firewood is required to produce heat energy for processing. The new energy efficient process with solar water heating system yields a saving of 77.97% firewood consumption compared to conventional process.


Parameswara P.,University of Mysore | Nivedita S.,Central Silk Technological Research Institute | Somashekar R.,University of Mysore
AIP Conference Proceedings | Year: 2011

Loom finished mulberry silk fabrics (Taffeta) were machine laundered and hand laundered several times. X-ray diffractograms of pure and laundered fabrics were used to calculate microstructural parameters like average crystallite size (D) and lattice strain (ε) employing Williamson-Hall plot. Microstructural parameters were compared with measured mechanical properties like breaking load, tenacity, and elongation of warp yarns unraveled from fabrics. Surface morphology and texture of silk fabrics changed upon washing is evident from SEM images. © 2011 American Institute of Physics.

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