http://nopr.niscpr.res.in/handle/123456789/43235 2026-10-09T21:55:11Z 2026-10-09T21:55:11Z Bal, Kausik Hes, Lubos Bajzik, Vladimir http://nopr.niscpr.res.in/handle/123456789/43253 2017-12-13T09:24:45Z 2017-12-01T00:00:00Z

Title: Analytical model to study a new design concept for providing comfort in hot arid climate Authors: Bal, Kausik; Hes, Lubos; Bajzik, Vladimir Abstract: A special design of clothing based on ‘sombrero-effect’ by inclined wedge providing shadow on the base material has been proposed and investigated analytically in this study to improve the thermo-physiological comfort under dry and hot environment. The design involves small strips of opaque surface on the base fabric of the outerwear to provide tiny shadows at an inclination. The analysis of the heat and mass transfer in the proposed design enables numerical prediction of cooling heat flow at skin surface level. The predicted values are then compared with experimental data by simulating the conditions using a vertical skin model. The effects of certain material properties, particularly the colour of fabric and type of fibre have been studied and the role of the important design parameter, such as ‘shade angle’ or the angle of inclined strips has been investigated experimentally. It is observed that the analytical framework of heat and mass transfer in such a system is able to give useful results. Page(s): 379-385

2017-12-01T00:00:00Z Eldeeb, Moaz Moučková, Eva Ursíny, Petr http://nopr.niscpr.res.in/handle/123456789/43252 2017-12-13T09:21:34Z 2017-12-01T00:00:00Z

Title: Properties of viscose air-jet spun plied yarns Authors: Eldeeb, Moaz; Moučková, Eva; Ursíny, Petr Abstract: Effect of ply twist, its direction and number of plies on air-jet plied yarn properties has been studied. It is found that when air-jet yarns are plied in a direction which is similar to single yarn wrapper fibre twist direction, the yarn irregularity, imperfections and hairiness improve, while plying in the opposite direction of the single yarn wrapper fibres reduces twist liveliness and improves yarn tenacity. Regarding the effect of ply twist, by increasing ply twist, the yarn abrasion resistance and hairiness improve, while tenacity improves to an optimum level and then deteriorates. This optimum twist level varies according to ply yarn twist direction. Three plied yarns are better than two plied yarns in terms of tenacity and breaking elongation. This confirms that three plied yarn has better evenness than two plied yarn. Considering yarn tenacity, air-jet yarns should be twisted in opposite direction of their single yarn twist direction. Page(s): 386-390

2017-12-01T00:00:00Z Navik, Rahul Dalvi, Ajit Sanas, Payal Karande, Shivraj Cai, Yingjie http://nopr.niscpr.res.in/handle/123456789/43251 2017-12-13T09:18:56Z 2017-12-01T00:00:00Z

Title: Effect of dielectric barrier discharge parameters on properties of mulberry silk fibre Authors: Navik, Rahul; Dalvi, Ajit; Sanas, Payal; Karande, Shivraj; Cai, Yingjie Abstract: A dielectric barrier discharge reactor operated at atmospheric pressure has been used to modify the properties of plain woven silk fabrics. Operating parameters, such as treatment time, and the intensity of current across the electrodes has been changed in the presence of air as a plasma gas. Properties such as wickability, absorbency, tensile strength, tear strength, dyeability measurements; Fourier transform infrared spectroscopy FTIR analysis; and surface topology investigations have been carried out in this study. The findings reveal that the plasma treatment results in surface etching and generation of new functional groups mainly oxygen and oxygen-containing groups. Newly formed functional groups contribute to the improvement in water absorbency and the rate of vertical wicking on silk stripe. Selected acid and basic dye uptakes on treated samples are found to increase almost linearly, but the values decrease with the increase in treatment duration at a higher discharge current. A slight increase in tensile and tear strength is observed in air plasma treated silk fabrics. Air plasma treatment of silk fabric in high energy barrier discharge results in an increase in yellowness. SEM micrographs clearly confirm the formation of ripple like surface morphology in the form of micro-roughness created by etching effect of active species of air plasma. Page(s): 391-398

2017-12-01T00:00:00Z Gupta, Shravan Kumar Majumdar, Abhijit Goswami, Kamal Kanti http://nopr.niscpr.res.in/handle/123456789/43250 2017-12-13T09:13:45Z 2017-12-01T00:00:00Z

Title: Compressional behavior of Persian hand knotted wool carpets using response surface methodology Authors: Gupta, Shravan Kumar; Majumdar, Abhijit; Goswami, Kamal Kanti Abstract: The effects of knot density, pile height, number of ply in pile yarn and pile yarn twist on compressional behavior (compression and compression recovery) of Persian hand knotted wool carpets has been studied. The influence of variables on compression behavior of carpets has been quantitatively analyzed by using response surface methodology based on the Box-Behnken design of experiment. The minimum compression occurs with the combination of minimum values of pile height (10 mm), knot density (5 knots/inch) & number of ply in pile yarn (2 ply), and maximum value of pile yarn twist (4.5 twists/inch). However the maximum compression recovery is attained with the combination of minimum values of pile height (10 mm) & pile yarn twist ( 3.5 twists/inch), and maximum values of knot density (7 knots/inch) & number of ply in pile yarn (4 ply). Page(s): 399-406

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