NOPR Collection:

Imperfections in Jute Fibre (C. olitorius L.)-Morphological Characters

1979-06-01T00:00:00Z

Title: Imperfections in Jute Fibre (C. olitorius L.)-Morphological Characters Authors: Bandyopadhyay, S B; Mitra, Basantika Abstract: The nature of some imperfections in jute fibre in green, retted and mill-processed states with reference to their technological importance is reported. In the meshy structure of jute fibre reed, the meshes or loops have been found to vary widely in size. In green state, primary filaments (cell chains) have been found to follow a wavy path; after retting, they become rectilinear with occasional bents. The meshes or loops are built up of irregular contacts between primary filaments and compound filaments. Such contacts appear to be separable, but in mill processing, fibre splitting is neither complete nor harmless. Transverse sections vary widely in the number of cells, contour, and the type of fissures and holes within them, both between and along individual filaments. The likely effects of such variations on strength, fineness, length and surface friction of individual filaments and hence on the spun yarn are discussed. The scope for further splitting of the filaments into finer filaments is suggested. Page(s): 77-84

Studies on Short Glass Fibre Reinforced Nylon 6: Compounding, Moulding and Characterization

1979-06-01T00:00:00Z

Title: Studies on Short Glass Fibre Reinforced Nylon 6: Compounding, Moulding and Characterization Authors: Singh, R K; Gupta, V B Abstract: Plastic grade nylon-6 granules were compounded with 6 mm long chopped glass fibre strands on an extruder and the reinforced pellets obtained were injection-moulded into test specimen. With the incorporation of 30% by weight of glass fibre, the tensile strength improves by a factor of more than 2 and the tensile modulus by a factor close to 3; the heat distortion temperature also shows a three-fold increase. The elongation-at-break is reduced considerably and the shrinkage in the mould is also reduced. Thus, the composite has the properties of a good engineering plastic. Page(s): 74-76

A Method for Measuring the Flex Abrasion Resistance of Sewing Threads

1979-06-01T00:00:00Z

Title: A Method for Measuring the Flex Abrasion Resistance of Sewing Threads Authors: Pal, (Mrs.) S D; Munshi, V G; Ukidve, A V Abstract: An attempt has been made to develop and standardize a method for the determination of flex abrasion of sewing threads on Stoll Quarter Master Universal Wear Tester (SQMUWT) which has been designed mainly for measuring fabric abrasion. The applicability of the method has been established by testing 40 sewing threads of different types. Page(s): 71-73

Detailed Analysis of Carding Quality and Its Influence on Processing and Yarn Properties

1979-06-01T00:00:00Z

Title: Detailed Analysis of Carding Quality and Its Influence on Processing and Yarn Properties Authors: Nerurkar, S K Abstract: Detailed analysis of card web/sliver and other post-card products has been done for obtaining improved understanding about the changes in the characteristics of card web/sliver with carding quality and the impact of carding quality on the properties of yarn spun on different spinning systems. The analysis has shown that although the routine tests of carding quality such as trash in sliver, neps in card web, cylinder load, etc. assist in grading carding quality, other card web characteristics such as evenness in card web weight per unit area, short term variation in sliver thickness, fibre parallelization, fibre to fibre separation are also important parameters of card web contributing to carding quality. Although bad carding gives better parallelization, the rate of improvement in parallelization in the subsequent processes is better with good carding, probably due to better fibre separation. Fibre separation seems to influence carding quality more than fibre parallelization. The size of trash particles does not change much with carding condition. Open end spinning has been found to be more sensitive to carding condition both for performance and yam quality than ring spinning. These findings suggest that by carding material under adverse conditions many carding quality characteristics other than the routine ones get changed and the influence on spinning performance and yarn quality depends on the spinning system used. Page(s): 63-70