NOPR Collection:

Some Comments on the Power-Law Dashpot Model for Creep in Wool Fibres

Wed, 01 Sep 1982 00:00:00 GMT

Title: Some Comments on the Power-Law Dashpot Model for Creep in Wool Fibres Authors: Iyer, K Janaki; Iyer, K R Krishna Abstract: The viscoelastic model comprising two springs and a dashpot connected in parallel is generally used to explain the creep behaviour of textile fibres. In the classical model, the dashpot liquid obeyed the Newtonian law. Later models incorporated a dashpot obeying either a hyperbolic sine law or a power law, both leading to creep equations containing four model constants. Page(s): 98-100

Fineness Characteristics of Jute Fibres in Sliver at Different Preparing Stages and in Yarn

Wed, 01 Sep 1982 00:00:00 GMT

Title: Fineness Characteristics of Jute Fibres in Sliver at Different Preparing Stages and in Yarn Authors: Banerjee, B L Abstract: The fineness-length relationship and the average tex of fibres in hessian quality slivers at finisher card, and first, second and finisher drawing stages, and in yarns have been studied separately for the three broad categories of fibres termed unfolded folded and root (i.e. those originating from the under-retted root ends or defective parts of raw jute reeds). The tex value of unfolded and folded fibres increases almost linearly with their length over the length range 5 to 30 cm, and there seems to be no appreciable change in fineness of fibres over this range at the drawing and spinning stages. In the case of root fibres, however there is no clear trend in fineness-length relationship. The average tex of fibres is reduced from finisher card sliver to yarn, the reduction being more pronounced at the first drawing stage. It is suggested that this is due to the rupturing and splitting of long fibres (> 30 cm) which are generally more branchy and coarser than the normal ones. The number of unfolded fibres increases but that of folded fibres decreases from finisher card sliver to yarn. The number of root fibres remains practically unaltered at all the stages. Page(s): 93-97

Evaluation of Jute as a Reinforcement in Composites

Wed, 01 Sep 1982 00:00:00 GMT

Title: Evaluation of Jute as a Reinforcement in Composites Authors: Sridhar, M K; Basavarajappa, G; Kasturi, S G; Balasubramanian, N Abstract: A detailed evaluation of jute fibres for use in polymer composites has been made. The mechanical properties, thermal stability, moisture absorption and resin consumption of jute fibres have been studied. Methods for reducing moisture absorption and resin consumption are reported. Page(s): 87-92

Evaluation of Crystallinity in Poly (Vinyl Alcohol) and Its Oxidation Products by X-Ray Diffraction

Wed, 01 Sep 1982 00:00:00 GMT

Title: Evaluation of Crystallinity in Poly (Vinyl Alcohol) and Its Oxidation Products by X-Ray Diffraction Authors: Wadekar, S D; Mehta, H U; Kulshreshtha, A K; Dweltz, N E; Trivedi, J J Abstract: An X-ray method for evaluating the degree of crystallinity in poly (vinyl alcohol) is described. The method has been used for the characterization of oxidized PVA samples. The results of X-ray characterization of PVA polymers are in conformity with their infrared spectroscopic evaluation. Page(s): 82-86