http://nopr.niscpr.res.in/handle/123456789/64237 Sat, 10 Oct 2026 13:49:58 GMT 2026-10-10T13:49:58Z http://nopr.niscpr.res.in/handle/123456789/64252 Title: Sustainable denim fading using immobilized cellulase on reversibly soluble-insoluble polymers Authors: Madhu, Amit Abstract: This study introduces a sustainable approach to generic denim fabric washing by employing immobilized cellulase on two eco-friendly polymers (chitosan and Eudragit S-100). The immobilization process enhances the stability and reusability of cellulase, while the choice of chitosan and Eudragit S-100 allows for reversible solubility and insolubility, providing easy removal of the enzyme after the washing process. The study investigates the enzymatic activity and stability of cellulase when immobilized on chitosan and Eudragit S-100 and assesses their efficiency in denim fading. The experimental results reveal that the immobilized cellulase exhibits some decreased activity with increased pH and thermal stability. The immobilized cellulase grades equivalent denim decolouration with reduced back-staining for three consecutive cycles in comparison to native cellulase which is drained after a single use. The proposed method not only addresses the economic constraints of the reusability of enzymes but also contributes to the development of innovative and sustainable practices in textile industry. Page(s): 141-149 Wed, 01 May 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/64252 2024-05-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/64251 Title: Cattail- luffa fibre reinforced and rice stubble ash filled composites for acoustic applications Authors: Kishor, Kaushal; Singh, Mukesh Kumar; Chakraborty, Supriyo Abstract: The possibility of using fibro-granular acoustic composites for the sound absorption of a wide range of frequencies through an experimental approach has been explored. The fibrous materials (cattail and luffa fibre) and granular materials (rice stubble ash) are used for the manufacturing of acoustic boards. The use of toxic binders, such as phenol-formaldehyde, polyester foams and polyurethane, has been eliminated in this modified method to manufacture acoustic panels through a sustainable development route. The extraordinary free space available in the network of luffa fibres has been utilized to hold the rice stubble ash particles binder and still left free space are used for effective sound absorption. The prepared samples are tested mainly for density, pore size and sound absorption coefficient. The findings show that the developed panels have a density of 80 kg/m3 and pore size of 110 μm, which are effective in absorbing both low and high-frequency sound waves within the acoustic frequency range 63 −6300 Hz. The sound absorption coefficient of these panels is found more than 0.8, which is comparable with commercially available acoustic boards. These eco-friendly acoustic panels, made of agricultural residues such as cattail fibre, luffa fibre and rice stubble waste, do not require significant capital to make a green utilization of waste materials for product development. Page(s): 150-159 Sat, 01 Jun 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/64251 2024-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/64250 Title: Jute composite based single-leaf structure for sound insulation Authors: Datta, M; Chatterjee, B; Ray, P; Nath, D Abstract: The present study deals with the development of a mathematical equation that effectively predicts the sound insulation performance of a single-leaf structure constructed using jute composites with varying resin uptake ratios. The investigation employs a reference device to measure the transmission loss (TL) of sound energy as it propagates through a single-leaf structure. The objective is to investigate the impact of structural parameters, namely thickness, theoretical density, and compaction factor, on the attenuation of sound waves within the frequency range of 50–3150 Hz. It has been revealed that an increase in resin uptake, i.e. lower fibre content, is associated with a higher occurrence of voids inside the structure. The presence of voids inside the jute composites is inversely related to TL, while at a given fibre content, transmission loss is linearly related to the areal density of a single-leaf structure, regardless of the thickness of the jute composite. The derived equation for predicting the transmission loss of sound propagating through a single-leaf is expressed as the modified mass law of sound. This equation demonstrates that the mass of an individual leaf structure has a substantial effect on transmission loss, surpassing the influence of frequency. The study provides evidence that the jute composite can be engineered to achieve a degree of transmission loss that is comparable to the materials commonly used for sound insulation applications. Page(s): 160-172 Sat, 01 Jun 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/64250 2024-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/64249 Title: Banana leaf extract-based emulsions for multifunctional healthcare textiles Authors: Joshi, Shubham; Kambo, Neelu; Dubey, Saurabh; Panday, Ritu; Kowshiga, AT; Nandhini, E; Deepadharushini, D; Sankganidhi, SP Abstract: The study focuses on the investigation of emulsion derived from natural waste from two different varieties of Musa acuminata, "Red banana leaf" (RBL) and "Yellow banana leaf" (YBL) for finishing of cotton and silk fabric samples. Both the samples are treated with three different concentrations (5, 10 and 15%) of emulsions extracted from banana leaves. The antibacterial activity of the treated samples is evaluated against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacteria. The silk samples treated with 15% RBL show significant antimicrobial activity, with 85% effectiveness against S. aureus and 82% against E. coli. The study further investigates the ultraviolet protection factor and wash durability of the treated textiles. The developed technology can be useful in addressing critical healthcare issues, offering benefits, such as antimicrobial activity, wound healing and improved patient comfort. Page(s): 173-180 Sat, 01 Jun 2024 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/64249 2024-06-01T00:00:00Z