NOPR Collection:

Optimum Process Stock in Cotton Mills

2016-07-20T06:36:31Z

Title: Optimum Process Stock in Cotton Mills Authors: Govindarajulu, K.; Nataraj, R. Abstract: The optimum process stock to be held in spinning in various counts bas been worked out The total stock has been divided into three main parts: (a) mixing and blow room, (b) on-machine stock, and (c) off-machine stock. If proper balancing of production is ensured, the on-machine stock is automatically fixed. The off-machine stock will depend on the demand for back material, which, in general, follows a negative exponential distribution. The criterion for fixing the off-machine stock should be the peak demand, which is almost twice the normal demand. Page(s): 86-90

A Colorimetric Method for the Estimation of Chromium in Wool

2016-07-20T06:36:09Z

Title: A Colorimetric Method for the Estimation of Chromium in Wool Authors: Solanki, R K Abstract: Acolorimetric method for the estimation of chromi_ in wool based on the use of EDTA as the chelating agent is reported. The method involves dry ashing of the wool pie, oxidation of Cr(III) to Cr(VI) using nitric acid potassium chlorate, reduction of Cr(VI) to Cr(III) by treatment with ascorbic add and finally complex formation with EDTA solution. The chromium-EDTA complex gives an absorption maximum at 546 nm. The stability of the complex is much greater than those of the complex obtained with the currency used chelating agents, viz. diphenylcarbazide and haematoxylin. Therefore, the results with EDTA are more accurate. Page(s): 83-85

Permeation of Naphthalene through Polyethylene and Waxed Paper-A Comparative Study

2016-07-20T06:35:51Z

Title: Permeation of Naphthalene through Polyethylene and Waxed Paper-A Comparative Study Authors: Kandpal, L. D.; Chawla, S. B.; Banerjee, P. K.; Balakrishna, K. J. Abstract: Permeation of naphthalene through low density polyethylene film and a waxed paper conforming to a military specification bas been studied under similar conditions of temperature and relative humidity. Polyethylene film is found to be considerably more pervious to naphthalene than the waxed paper. Page(s): 80-82

Quantitative Extraction of Vat Dyes from Dyed Cellulosic Material

2016-07-20T06:35:36Z

Title: Quantitative Extraction of Vat Dyes from Dyed Cellulosic Material Authors: Mehta, D. S.; Chavhan, R. S.; Mehta, H. U. Abstract: The limitations of the existing methods for the extraction of dyes from dyed materials are brought out with supporting literature. An efficient technique based on aqueous preswelling of the dyed substrate and subsequent extraction of the dye with o-chlorophenol (OCP) is described. The effectiveness of this technique is supported by the experimental values for five selected vat dyes of different structures. The dyes are stable in boiling OCP and also during storage. The mechanism of dye removal from dyed cellophane is studied with the aid of scanning electron microscopes. Page(s): 76-79