NOPR Collection:

Test Methods for Air-Jet Textured Yarns

2016-07-20T06:24:39Z

Title: Test Methods for Air-Jet Textured Yarns Authors: Srinivasan, J; Kothari, V K; Sengupta, A K Abstract: There are wide ranging quality parameters of the air-textured yarns on which depend their end use applications such as upholstery, apparels and technical applications such as sewing threads. However, the most important quality parameters of air-textured yarns are: instability; physical bulk; boiling-water shrinkage; size, form and frequency of loops; and tensile properties. A number of test methods are available for the evaluation of these properties and the present review provides a critical insight into them. The advantages and shortcomings of some of these methods have also been highlighted. The lack of standardization of the various test methods is pointed out and the need for arriving at a consensus on the test methods of the important properties of air-textured yarns is stressed. Page(s): 97-106

Tensile Behaviour of Multifilament Yarns at High Twist Levels

2016-07-20T06:23:36Z

Title: Tensile Behaviour of Multifilament Yarns at High Twist Levels Authors: Mukhopadhyay, Anjan Kumar; Dutta, Bhaskar Abstract: The twist tenacity curves for twisted multifilament yams, predicted by the analytical model, depart substantially from the theoretical plot due to the melding (merging) of the filaments under high twist levels. On the occurrence of melding the load-sharing property of individual filaments is improved. At points of melding, the load tends to be shared by the concerned filaments jointly. Page(s): 95-96

Frictional Behaviour of Dref Yarn, Air Jet Yarn and Ring-spun Yarn with Reference to Textile Contact Surfaces

2016-07-20T06:22:43Z

Title: Frictional Behaviour of Dref Yarn, Air Jet Yarn and Ring-spun Yarn with Reference to Textile Contact Surfaces Authors: Kalayanaraman, A R Abstract: The static and dynamic frictional behaviours of dref and air jet yarns were examined using SITRA yarn friction measuring device. These yarns showed a higher coefficient of friction with reference to surfaces when compared with that of ring-spun yarn. The frictional behaviour of acrylic yarn was also studied. Acrylic yarns had a higher coefficient of friction then cotton yarns. Acrylic yarn, Processed in the cotton system, wore out the contact surfaces faster. Page(s): 92-94

Synthesis of Azodisperse Dyes from Activated Nitriles for Dyeing Acetate and Other Fibres

2016-07-20T06:22:03Z

Title: Synthesis of Azodisperse Dyes from Activated Nitriles for Dyeing Acetate and Other Fibres Authors: Fadda, A A; Elmorsy, S S; Elagizy, S A Abstract: Some azodisperse dyes, 5-arylazo-4-oxo-4, 5-dihydro-1, 3-thiazol-2-(ɑ-arylazo)-acetamides (II), ɑ-arylazocyanoacethydrazides (IV) and 3-amino-4-arylazo-2-pyrazolin-5-ones (V), have been prepared for use as dyestuffs. The effect of nature and orientation of substituents in the diazonium component on the colour of azo dyes is discussed. Page(s): 87-91