NOPR Collection:

Scanning Electron Microscope Study of Flax Fibres

Sat, 01 Dec 1979 00:00:00 GMT

Title: Scanning Electron Microscope Study of Flax Fibres Authors: Rahman, M M M; Sayed-Esfahani, M H Abstract: The surface characteristics of flax fibres subjected to several chemical treatments have been studied using the scanning electron microscopy. It has been found that topographically flax fibres can be improved and partial 'cottonization' is possible with depectinizing treatments, and eventual 'cottonization' is technologically feasible with delignification treatments. Page(s): 149-152

Relationship between Single Fibre Strength and Behaviour of Yarns and Fabrics

Sat, 01 Dec 1979 00:00:00 GMT

Title: Relationship between Single Fibre Strength and Behaviour of Yarns and Fabrics Authors: Patni, P C; Bapna, D L; Pokharna, A K; Mathur, J P; Singh, V P; Arora, R K; Malhi, R S Abstract: The physical characteristics and breaking strengths of fibres of wools of eight Indian and crossbred sheep and yarns and fabrics obtained there from have been investigated with the objective of establishing correlations, if any, between the characteristics of individual fibres and those of their yarns and fabrics. It is observed that fabric strength depends primarily on yarn strength. Fibre strength does not appear to affect fabric and yarn strengths to a significant extent. Page(s): 145-148

Improvements in Yarn Quality and Ringframe Performance in Fine Counts by Higher Licker-in and Cylinder Speeds in Carding

Sat, 01 Dec 1979 00:00:00 GMT

Title: Improvements in Yarn Quality and Ringframe Performance in Fine Counts by Higher Licker-in and Cylinder Speeds in Carding Authors: Shah, R S; Balasubramanian, N Abstract: An attempt has been made to assess the improvement in carding quality in semi-high production cards resulting from increase in licker-in up to 800 rpm and cylinder speeds up to 300 rpm, the study being restricted to fine counts. The material was examined up to ring spinning to assess the effect on end breakage rate also. Increase in licker-in speed was found to improve the cleaning efficiency significantly in all the four mixings studied. There was no evidence of fibre rupture, or any increase in nep generation at the higher speed. On the other hand, there was clear evidence to show that increase in licker-in speed helped to remove the immature fibre clusters and fuzzy fibres more effectively. Although the physical properties of the yarn were nearly unaffected, a significant reduction in ringframe end breakage rate could be obtained at higher licker-in speed. Increase in cylinder speed was associated with reduced cylinder load, but without change in transfer efficiency. There was a consistent improvement in card cleaning efficiency with increase in speed for all the mixings. Although yarn strength and evenness were not much affected, the yarn imperfections showed consistent reduction at higher cylinder speed with three out of four mixings. Ringframe end breaks also showed a significant reduction at the higher cylinder speed with all the mixings, except 70s. Page(s): 140-144

Tensile Behaviour of Core-Spun Yarns

Sat, 01 Dec 1979 00:00:00 GMT

Title: Tensile Behaviour of Core-Spun Yarns Authors: Lokanatha, K L; Srinivasalu, B G; Basavaraj, B Abstract: Core-spun yarns incorporating a textured nylon multifilament core were prepared by introducing the multifilament core along with a drafted ribbon of fibres as the latter entered the nip of the front rollers of a ring frame. The geometrical disposition of the core was altered by changing the twist multiplier, pre-tension and the type of feeding of the sheath material, and the effects of these changes on the tensile properties were evaluated. Comparison of the stress-strain curves for the core-spun yarns with those for the continuous filament and cotton yarns of the same counts spun under identical conditions highlighted the behaviour of the components in a core-spun yarn undergoing strain. The contribution of the cotton components to core-spun yarn strength was assessed by the study of cotton fibre breakage at various levels of yarn strain. The results from the Instron tensile tester reveal the mode of strain distribution along the length of the yarn. The process of rupture of the core-spun yarns has also been studied in detail. The development of the spinning processes. Page(s): 133-139