This paper analyzes the relationship between technological parameters of spinning of 100% CV Vortex yarns of different counts and its selected geometrical parameters (a lead of helix of wrapping fibre ribbon, yarn diameter) as well as yarn properties. The number of twist of wrapping fibre layer is determined. The effect of the yarn delivery speed, hollow spindle diameter, and the main draft on the hairiness, mass irregularity, tenacity, elongation, resistance to abrasion and bending rigidity of Vortex yarn is observed. The yarn properties are compared with the properties of open-end rotor spun yarns. Slivers of the same spinning lot were used for the production of both kinds of yarn. The results showed that the delivery speed in combination with spindle diameter affects yarn diameter, hairiness and abrasion resistance. Mass irregularity and imperfections of yarn is mainly affected by the main draft of drafting unit. Technological parameters of spinning do not affect the level of bending rigidity of the Vortex yarn. Tested rotor spun yarns had a larger diameter, higher hairiness, lower tenacity and higher elongation, lower mass irregularity and number of imperfections, higher abrasion resistance and lower bending rigidity compared to tested Vortex spun yarns.
Yarn hairiness is usually characterized by the amount of free fibers protruding from the compact yarn body towards the outer yarn surface. Its determining is essential because it influences the post spinning operation and parameters of the textile product. Factors influencing yarn quality, mainly yarn hairiness, are correlated and therefore the conclusions depend on all production conditions. Main aim of this article is to show, how quickly and effectively the statistical methods principal component analysis can be applied to obtain information about similarity of yarn samples behavior and build complex quality criterion for yarn. A set of ring yarns is produced for complex quality analysis. The Zweigle G 567 and Uster Tester 4 are used for yarn hairiness investigation.
The article focuses on a new approach for characterization and evaluation of lateral yarn deformation. A small review
about theoretical description and measurement possibilities will be introduced. The evaluation of yarn compression
will be done by three innovative methods (lateral deformation of yarn between two parallel plates, simulation of
binding point of fabric, cross-sectional analysis of real fabric). The analysis of yarn deformation will be carried out
for a set of samples in combination of fiber material, yarn count and given fabric structure.
There exist a lot of methodologies, which can be used for yarn quality testing. Abrasion resistance and its
measurement for raw and sized yarn can help in the judgment of yarn weaving-ability. This article concentrates on
the possibility of yarn abrasion expression and testing. Relation among fiber material characteristics, selected yarn
structural, and mechanical parameters is discussed and a few experimental results are shown.
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