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Articles by B.R. Das
Total Records ( 4 ) for B.R. Das
  B.R. Das , S.M. Ishtiaque and R.S. Rengasamy
  The breaking strength of spun yarn is accepted as one of the most important parameters for assessment of yarn quality and one basic way to increase profit and quality in textile process is to hold yarn breakage to a minimum level. The mechanism of yarn failure under tensile loading decides the strength of staple yarns. This study presents the critical review of various theoretical and experimental works pursued on static failure mechanism of ring, rotor, air-jet and friction spun staple yarns. The reported failure mechanisms of slivers androvings and yarns in woven fabrics are also summarized. The aterial, spinning and testing parameters influencing the static failure mechanisvarious mm are discussed.
  B.R. Das , S.M. Ishtiaque and R.S. Rengasamy
  Many researchers have reported the fibre migration behaviour of blended ring yarns; but very few researchers have studied the phenomenon of fibre migration in blended spun yarns produced in new spinning systems like; rotor and air-jet spinning. The earlier studies on blended rotor spun yarns were represented by the average behaviour of the different components; which motivated to study the migration behaviour of individual components along with their average behaviour in the rotor spun blended yarns in terms of three parameters, Mean Fibre Position (MFP), Mean Migration Intensity (MMI) and Root Mean Square Deviation (RMSD)-using tracer fibre technique. Five blend proportions; 100% polyester, 67/33 polyester/viscose, 50/50 polyester/viscose, 33/67 polyester/viscose and 100% viscose was considered for analysis of effect of blend proportion on the migration behaviour of rotor spun yarns. Statistical analysis was carried out at 95% confidence level to bring out the specific trend executed by the yarns. Six number of contrasting tracer colours was established and exploited to study the migration behaviour with higher precision. The studied migration behaviour showed that the migration parameters don’t follow any specific trend with increase in the viscose or polyester content. 100% polyester yarn has lower MFP and higher MMI than the 100% viscose yarn. The polyester/viscose 33/67 has highest value of RMSD than the other blends.
  S. Hati and B.R. Das
  Seam pucker is a wrinkled appearance along the seam, which influences the appearance to a considerable degree. The various causes of seam pucker are discussed here. This critical review article basically presents the various methods of evaluation of seam pucker. There are several methods emerged with time to evaluate the seam pucker, however the research is still continuing to find our more accurate and easy methods. The initial methods of seam pucker evaluation was based on subjective assessment, but it suffered from the limitations of higher evaluation time, inconsistency among judges and need for training and the results are not reliable. The objective assessment of seam pucker is carried out by the various methods; photometric instruments, cognitive theory, parallel light, fractal dimension, artificial neural network, neuro-fuzzy logic, sensory measurement and structured light projection. The advantages and disadvantages of various methods of objective assessment are brought out.
  M.K. Sinha , B.R. Das , A. Srivastava and A.K. Saxena
  This research work reports on the influence of process parameters like voltage, spinning electrode speed, distance between electrodes and solution concentration on the morphology and tensile properties of electrospun nanofibrous PVA webs. The electrospinng spinning assignment is carried out with the commercially available Nanospinder machine. The morphological developments are explained on the basis of nanofibre diameter and web density as depicted by the FESEM images. The tensile properties are measured in terms of the mean tensile stress and Young’s modulus. The influence of individual parameters in isolation is studied herewith for assessing their individual influence and accordingly can be put together in order to control the process for proper development of nano webs morphology. The correlation of morphological developments and tensile properties is brought out for deciding the effective combination of process parameters in order to obtain stronger nanofibrous webs.
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