Change of Yarn Hairiness during Winding Process: Analysis of the Protruding                 Fiber Ends

Lang, Jun; Zhu, Sukang; Pan, Ning

doi:10.1177/0040517506059710

Cited by 7 publications

(4 citation statements)

References 12 publications

(23 reference statements)

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“…So the core fiber is gripped by neighboring fibers in the yarn by the friction force. The mean lateral pressure g λ per unit area acting on the core fiber can be calculated from [10][11][12][13][14][15][16] as…”

Section: Mean Gripping Force Acting On the Preceding Portion Of The Fiber Inside Yarn Corementioning

confidence: 99%

“…where λ is a correction factor, τ is the cohesion factor, an indicator of the gripping effect of the yarn structure on each individual fiber, µ 1 is the friction coefficient between the core fiber and neighboring fibers, E f is the fiber modulus, n 1 is the mean number of the fibers in the yarn cross section, V f is the mean volume percentage of the fiber, q is the helix angle of the fiber on the yarn surface, = r f is the mean radius of the cut fiber ends in the yarn section, is the core fiber aspect ratio of the fiber, is the length efficiency factor of the fiber, when the aspect of ratio s tends towards infinite, and η f = 1. The so-called fiber orientation efficiency factor η q , the density index of the contact point I, ψ, and S(T,L) are functions of the helix angle q, and all are calculated from [10] and [15].…”

Section: Mean Gripping Force Acting On the Preceding Portion Of The Fiber Inside Yarn Corementioning

confidence: 99%

See 1 more Smart Citation

A Study of Generating Yarn Thin Places of Murata Vortex Spinning

Zou

Cheng

et al. 2009

Textile Research Journal

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In Murata vortex spinning, fiber loss is an important cause of the generation of yarn thin areas. In this paper, based on the attenuation law of flow field inside the nozzle block, the force analysis of a separated fiber twined over the top exterior of a hollow spindle in a twisting chamber is carried out, and the movement of a separated fiber affected by a swirling current is discussed. We also present a simple analytical formation that determines the critical angular velocity of the open-end trailing fiber rotating around the hollow spindle, as a function of the length of the core fiber and fiber radius, as well as other parameters. The critical angular velocity can affect whether the leading end of the fiber is pulled out from the yarn trail or not, which can explain the generation of fiber loss and yarn. The critical angular velocity increases with increasing length of the core fiber and decreasing fiber radius. Above a certain nozzle pressure, the fiber radius is larger, there is greater fiber loss and there are a greater number of thin places in the vortex spun yarn. Increasing the nozzle pressure first enhances the yarn tenacity, and then generates more fiber loss and yarn thinning in places, and also causes a deterioration of the yarn properties when the nozzle pressure exceeds the critical point.

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Section: Mean Gripping Force Acting On the Preceding Portion Of The Fiber Inside Yarn Corementioning

confidence: 99%

Section: Mean Gripping Force Acting On the Preceding Portion Of The Fiber Inside Yarn Corementioning

confidence: 99%

A Study of Generating Yarn Thin Places of Murata Vortex Spinning

Zou

Cheng

et al. 2009

Textile Research Journal

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“…100 Lang et al investigated the post spinning increase in yarn hairiness during auto winding using a theoretical model. 109 They found the minimum fiber length and fiber metal friction level at which a fiber can be pulled out of the yarn core contributing to an increase in hairiness.…”

Section: Post Spinning Developments Regarding Yarn Hairinessmentioning

confidence: 99%

Recent research and developments on yarn hairiness

Haleem

Wang

2014

Textile Research Journal

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Hairiness is an important quality parameter of spun yarns. It not only affects the quality of yarns, but also the weaving and knitting performance of yarns as well as the quality of the resultant fabrics. Various developments regarding yarn hairiness have been reported in the last decade. These cover aspects such as hairiness measurement, modeling, simulation, spinning modifications and post spinning treatments to reduce hairiness. This study is an attempt to critically review all significant recent developments regarding yarn hairiness. Further possibilities of research and future work are also briefly discussed.

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“…However, to achieve the above increases, it is necessary to wind with reasonable parameters to be able to achieve. Jun Lang and Sukang Zhu [5,6] investigated the hairiness change of yarn during winding by analyzing forces acting on the fiber ends protruding from the yarn body. According to this study, the cause of yarn hairiness is due to the yarn's friction with the friction discs of the tensioner and the grooved drum of the winding machine.…”

Section: Introductionmentioning

confidence: 99%

Influence of Some Winding Parameters on Hairiness of Yarn After Winding Process

TRUNG¹,

DIEU²,

ANH³

2023

Fibres and Textiles

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Hairiness is an important quality parameter of yarn after winding process. It affects not only the quality of yarn, but also the productivity of the warping, weaving, knitting machines as well as the quality of produced fabrics. Hairiness is influenced by the factors of raw materials, technology and equipment at all stages of yarn production. This article presents the results of experimental research on the simultaneous influence of four typical winding parameters, including: Winding speed (Z1), the load on the friction discs of the yarn tensioner (Z2), the distance between the bobbin and the yarn guide (Z3) and the pressure of package on the grooved drum (Z4) to the increasing percentage of the hairiness of the yarns after winding compared to that before winding. Yarn hairiness was measured by Uster tester 5. By using the second-order orthogonal experimental planning, together with the support of Excel 2019 and Design Expert 11 software, an experimental matrix and mathematical models describing the relationship between the four winding parameters and increasing percentage of the hairiness of three types of yarn (carded Ne 31/1 CVCD, combed Ne 30/1 CVCM, combed Ne 30/1 COCM) are established. The research result is the scientific basis for selecting the optimal winding parameters in order to achieve the required increase in hairiness of the yarn after winding or predict hairiness increase of the yarns before winding.

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Change of Yarn Hairiness during Winding Process: Analysis of the Protruding Fiber Ends

Cited by 7 publications

References 12 publications

A Study of Generating Yarn Thin Places of Murata Vortex Spinning

A Study of Generating Yarn Thin Places of Murata Vortex Spinning

Recent research and developments on yarn hairiness

Influence of Some Winding Parameters on Hairiness of Yarn After Winding Process

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