The Structure and Properties of Vortex and Compact Spun Yarns

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Title: The Structure and Properties of Vortex and Compact Spun Yarns
Author: Basal, Guldemet
Advisors: P. Banks-Lee, Committee Member
W. Oxenham, Committee Chair
C. Brownie, Committee Member
G. Hodge, Committee Member
Abstract: Properties of spun yarns are mainly affected by fiber properties and yarn structure. Yarn structure is primarily determined by the spinning process. In fact, each spinning process tends to produce a distinctive yarn structure. Recent refinements in spinning technologies have yielded significant improvement in yarn quality; however, the mechanism for these changes is not fully understood. Vortex spinning can be viewed as a modification or refinement of jet spinning, and compact spinning is an enhancement of traditional ring spinning. The present research focuses on identifying those structural differences which can be used to explain the properties of these newer yarns. Prior to the main investigation preliminary trials were conducted to asses the differences between the properties of vortex and air-jet yarns produced from a variety of polyester/ cotton blends. Additionally a literature survey was conducted. A specially designed experimental study was carried out with the role of twist on the properties of compact spun yarn compared to conventional ring spun yarn, and the results clearly show differences in tensile and hairiness characteristics. An attempt is made to explain these differences in terms of structural parameters and in particular faster migration within the yarn. Intuitively one may expect migration to be less for compact yarns because of the more compact yarn formation zone; however, the experimental results clearly show that this is not true and an explanation for the higher migration in compact yarn is proposed. For vortex yarn a similar study is reported, however the differences found for processing conditions are very small and it is difficult to draw any definite conclusion. Possible reasons for this are given. A new approach to yarn structure analysis and quantification is also investigated and shown to offer great potential as a tool for this type of study.
Date: 2003-04-21
Degree: PhD
Discipline: Fiber and Polymer Science
URI: http://www.lib.ncsu.edu/resolver/1840.16/4631


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