Yarn evenness
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Yarn evenness a critical appreciation of recent developments by K. Slater

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Published by Textile Institute in Manchester .
Written in English


Book details:

Edition Notes

Issue no.3/4 v.14 of Textile Progress.

Other titlesTextile Progress.
Statementby K. Slater ; edited by P.W. Harrison.
SeriesTextile progress -- v.14, no.3/4
ContributionsHarrison, P. W., Textile Institute.
ID Numbers
Open LibraryOL22170930M
ISBN 100900739851

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  (). YARN EVENNESS. Textile Progress: Vol. 14, No. , pp. YARN EVENNESS. IRREGULARITY IN SPUN YARN. All Staple fibre yarns vary in linear density, and most problems of yarn quality are related to this basic property. Irregularity in yarn is recognized in one of the waysVariation in linear density ion in thickness 3. This paper presents an automatic yarn characterization system, based on capacitive sensors for evenness measurement and on optical sensors for hairiness analysis. This approach enables direct yarn mass determination in 1 mm range for evenness, an increase by a factor of eight over the most common commercial solutions (8 mm), and will also enable hairiness measurement up to 1 mm with high .   Yarn Evenness & It’s Classification. Evenness, Unevenness, regularity, and irregularity are common terms used to describe the degree of uniformity of a textile product. In the textile field, the uniformity of products like the lap, sliver, roving or yam is expressed in terms of evenness or regularity or in terms of unevenness or irregularity.

Description Application. Yarn Board (Board Winder), is designed to check the yarn’s physical properties like the evenness, hairiness, neps and other possible imperfections, Variable pitch traverse of wraps per centimeter, adjustable winding speed drive, equipped with alternative pre-tension, with yarn package stand and 5 tapered aluminum black yarn boards x mm. Assessment. Yarn unevenness is one of the important indexes which presents the evenness of polyester POY filament and affects the performances of the filament. The principle of capacitive evenness tester Uster and the measurement method are described in this paper. The influences of operating environment and the measuring conditions on determining the unevenness of polyester POY filament are discussed. 2. Yarn Evenness: Unevenness: Variation in the linear density of a continuous strand or of a portion of as trand. Apparatus: Uster–Evenness Tester Principle: Difference in the capacitance variation. Lower the Count lower the Imperfections. One km of yarn is run through two capacitance plated at specific speed (fixed as per the count). The evenness and imperfection characteristics of each yarn were tested on USTER Evenness Tester-4 with testing speed of m/min and testing time of min. Along with yarn evenness properties thick (+50%), thin (%), neps (+%), and yarn hairiness index were also measured. All tests were.

  Capacitive method/Uster evenness tester: In this case the principle is that the current flow through the capacitor alter with the material amount inside the two plates of capacitor. So if yarn passes through the capacitor plate, the current flow change with respect to thickness/mass of the yarn, thick thin places. Chapter 8 provides the concept of autolevelling and the influence of various process and machine parameters in each processing stages on yarn evenness. Chapter 9 provides an insight about the various quality control graphical representations from the evenness testers such as normal diagram, spectrogram and V-L curves. Yarn Unevenness Yarn unevenness deals with the variation in yarn fineness. This is the property, commonly measured as the variation in mass per unit length along the yarn. In other words, it refers to the variation in yarn count along its length. It is the evenness of staple spun yarn that is of concern here.   INTRODUCTION: Non-uniformity in variety of properties exists in yarns. There can be variation twist.,bulk, strength, elongation, fineness etc. Yarn evenness deals with the variation in yarn fineness. Thisis the property, commonly measured as the variation in mass per unit length along the yarn, is a basic and important one, since it can influence.