NOPR Collection:

Dyeing Mechanism of Heat Set Polyester from Trichloroethylene, Water and Water-Trichloroethylene Mixtures

Wed, 01 Dec 1976 00:00:00 GMT

Title: Dyeing Mechanism of Heat Set Polyester from Trichloroethylene, Water and Water-Trichloroethylene Mixtures Authors: Gulrajani, M. L.; Sett, S. K. Abstract: Dyeing of a polyester fibre heat set at different temperatures has been carried out with disperse dyes. It is observed that the dye uptake by the fibre is minimum at setting temperatures in the range 170-200^oC and there is a gradual increase in the dye uptake at setting temperatures above 200^oC irrespective of the nature of the dyeing medium. This behaviour can be explained satisfactorily with the help of the free volume theory of dyeing of synthetic fibres. Page(s): 141-144

Prediction of Mechanical Properties of Resin Finished Fabrics

Wed, 01 Dec 1976 00:00:00 GMT

Title: Prediction of Mechanical Properties of Resin Finished Fabrics Authors: Venkatesh, G. M.; Dweltz, N. E.; Mody, J. R.; Gupta, K. C.; Mehta, H. U. Abstract: When cotton fabrics are resin finished to impart desirable wash and wear properties, there is a significant reduction in their wear life. In a recent study [Dweltz, N. E. & Mehta, H. U., Colourage, (1971), 78] it was shown that the relationships that exist between the percentage resin padded on the fabric on the one hand, and the percentage loss in abrasion resistance, tensile strength or the improvement in dry crease recovery on the other, or other various interrelationships which exist between the losses in abrasion resistance and tensile strength on the one hand and the improvement in DCR on the other, could be used to evaluate various resin finishing processes as well as the performance of various additives in the resin bath. The study has been extended to include different resins, catalysts, conditions of drying and curing, various resin finishing processes as well as fabric weaves. The data show that very clear-cut predictions are possible for a given fabric under a given set of resin finishing conditions. Page(s): 135-140

Effect of Reinforcement on Strength of Fibreglass Composites with Isophthalic Polyester Resin Matrix

Wed, 01 Dec 1976 00:00:00 GMT

Title: Effect of Reinforcement on Strength of Fibreglass Composites with Isophthalic Polyester Resin Matrix Authors: Saraf, M. N.; Gupta, R. K.; Balakrishna, K. J. Abstract: The effect of form of glass reinforcement and nature of surface treatment on the strength and modulus of 'E' glass fibre isophthalic polyester resin composites has been studied. While surface hardness is of the same order in all cases, a certain percentage of voids content seems unavoidable in chopped strand mat composites. Woven roving gave the highest tensile strength. Satin weave fabric was superior to plain weave fabric in contributing to strength. Silane treatment of plain weave fabric contributed significantly to tensile strength and flexural strength, but not to flexural modulus. Satin weave fabric produced laminates with the highest stiffness. Heat cleaning and vinyl silane treatment did not enhance the stiffness and specific stiffness of the laminate. Page(s): 132-134

Crease Recovery of Silk Fabrics

Wed, 01 Dec 1976 00:00:00 GMT

Title: Crease Recovery of Silk Fabrics Authors: Hari, P. K.; Gulrajani, M. L.; Pal, N. K. Abstract: To improve the crease recovery of silk fabrics, dimethylol ethylene urea (DMEU) was applied to control, photo-graded and esterified silk fabrics. The effect of cross linking was evaluated qualitatively by creasing the fabric and recovering the resin for periods ranging from 1 to 10⁴min. The results indicate that although there is some improvement in the immediate recovery, none of the samples is crosslinked with DMEU. The esterified resin treated fabric shows the best recovery over the whole range of loading and recovery times. Page(s): 128-131