NOPR Collection:

Between and Within Bale Variations in Testing of Fibres of Indian and Foreign Cottons

Thu, 01 Jun 1978 00:00:00 GMT

Title: Between and Within Bale Variations in Testing of Fibres of Indian and Foreign Cottons Authors: Govindarajulu, K.; Krishnaswamy, N. Abstract: The levels of between and within bale variations while testing cotton fibres have been studied for five Indian and five foreign varieties of cotton. Based on these variations, a sampling scheme has been evolved and confidence limits have been specified. The error involved In uniformity ratio of fibre length has been worked out. The effect on cleaning efficiency of using shorter method for assessing trash content has been discussed. The variations obtained in testing the various fibres, characteristics have been compared with those reported from the American Society for Testing and Materials, United States Department of Agriculture and some other agencies. Page(s): 55-60

Studies in Dyeing of Polyamides : Part II-Thermal Exposure of Nylon Filaments in the Presence of Cationic Dyestuffs

Thu, 01 Jun 1978 00:00:00 GMT

Title: Studies in Dyeing of Polyamides : Part II-Thermal Exposure of Nylon Filaments in the Presence of Cationic Dyestuffs Authors: Achwal, W. B.; Nagar, M. R. Abstract: The effect of thermal exposure on cationic dyed nylon filaments and filaments modified by blocking the amino groups has been investigated. The presence of cationic dyestuff has been found to confer some protection on nylon against fibre degradation. When amino groups in nylon are blocked prior to dyeing, the extent of protection afforded to fibre degradation is higher. Prior blocking of amino groups was also observed to retard the thermal fading of cationic dyes. Page(s): 50-54

Structural Geometry of False Twist Textured Yarns

Thu, 01 Jun 1978 00:00:00 GMT

Title: Structural Geometry of False Twist Textured Yarns Authors: Mittal, R K; Gupta, V B Abstract: Using a mathematical expression derived from the general theory of bending and twisting of thin rods, the presence in textured yarns of helices of both S- and, Z- type, reversal points, helices of varying radius, loops and snarls is explained. Page(s): 48-49

Studies on Structure and Properties of Low Twist Wet Spun Cotton Yarns

Thu, 01 Jun 1978 00:00:00 GMT

Title: Studies on Structure and Properties of Low Twist Wet Spun Cotton Yarns Authors: Sengupta, A K; Singh, V P; Iyer, B V Abstract: The structure and properties of low twist wet spun cotton yarns have been studied and compared with those of normal ring spun yarns. It is observed that even at a low twist level, wet spinning produces a much stronger yarn than ring spinning. The strength is further enhanced on dew axing followed by swelling in sodium hydroxide. The packing and clustering of wet spun yarns are considerably higher and the yarns exhibit poorer migration. The rate of strength loss on abrasion is higher for wet spun yarns compared to normal yarns, signifying poorer abrasion resistance of wet spun yarns. Page(s): 45-47