The Friction Couple in Yarn Bending

Leaf, G. A. V.

doi:10.1080/00405009508631309

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…The bending properties determine the handling performance of fabrics. 19–21 The BAR and BW values in both the warp and weft directions and outer and inner surfaces of the prepared cotton/chitosan fabric samples were recorded and are shown in Figure 5 and Table 4. There were strong negative correlations between BAR and chitosan blend ratio (BARa, r = −.815, p < 0.01; BARe, r = −.651, p < 0.01), and BW and chitosan blend ratio (BWa, r = −.849, p < 0.01; BWe, r = −.723, p < 0.01) (Table 6).…”

Section: Resultsmentioning

confidence: 99%

A pilot intervention with chitosan/cotton knitted jersey fabric to provide comfort for epidermolysis bullosa patients

Lam

Zhang

Yang

et al. 2017

Textile Research Journal

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Epidermolysis bullosa (EB) is a rare hereditary skin disease that causes skin fragility and blistering. Since the wounds of EB do not fully heal, and there is currently no available medical technology that can cure this skin disease, patients suffer from the related physical and psychological pain during their lifetime. Therefore, it is important that skin-protective apparel with protective functions be specifically developed for EB patients to improve their wear comfort and reduce their chances of further skin injuries through the interaction of clothing as a “second skin” and the human skin. This study investigated the fabric comfort properties of chitosan/cotton blend knitted jersey fabric in order to provide comprehensive knowledge to facilitate further medical textile development for EB patients. A proposed model determines the role of chitosan-based yarn in providing comfort to EB patients to determine scientifically the association between textile comfort and medical treatment, and establishes the relationship between percentage composition and comfort to facilitate further examination of medical textiles in both theoretical and practical aspects. The results show that increases in the concentration of chitosan (50% or above) in the blend ratio reduce the rigidity of the fabric and provide a softer handle for the inner surface of the fabric. The surface friction coefficient is reduced which means a smoother surface and the thermal maximum flux is also reduced, that intends a fabric with a cooler handle. It is concluded that fabric with a composition that incorporates chitosan fibers can provide better comfort, which in turn, facilitated the development of a skin-protective textile for EB patients, by the application of chitosan/cotton blend knitted jersey fabric.

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Section: Resultsmentioning

confidence: 99%

A pilot intervention with chitosan/cotton knitted jersey fabric to provide comfort for epidermolysis bullosa patients

Lam

Zhang

Yang

et al. 2017

Textile Research Journal

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“…This lack of fit probably results from the many assumptions made concerning the twine mechanics and the netting construction. Other studies have demonstrated that the assumption that bending moment is proportional to curvature is unlikely to hold for the twines used in the manufacture of fishing gears, where there will be friction between the component fibres, which are likely to bend non-linearly and move over each other (Leaf, 1995). Therefore, the regression equations above may not represent the physical situation accurately enough to obtain good estimates of all five parameters.…”

Section: Discussionmentioning

confidence: 97%

Experimental method for quantifying resistance to the opening of netting panels

Sala

O’Neill

Buglioni

et al. 2007

ICES Journal of Marine Science

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Sala, A., O'Neill, F. G., Buglioni, G., Lucchetti, A., Palumbo, V., and Fryer, R. J. 2007. Experimental method for quantifying resistance to the opening of netting panels. – ICES Journal of Marine Science, 64: 1573–1578. In recent years, the tendency in some sectors of the fishing industry has been to use thicker and stiffer twines in the manufacture of netting material. This increases the mesh's resistance to opening and, consequently, reduces the selective performance of fishing gears. The main characteristic of netting twine contributing to mesh resistance to opening is flexural rigidity (EI). We present a methodology for quantifying mesh resistance to opening through the use of a prototype called the resistance to opening and deflection meter (ROD-m). It incorporates four tension load cells and four stepping motors that are driven by four ministep bipolar chopper drives. Small panels of netting (3 × 3 meshes) can be mounted on ROD-m, which can measure the forces acting on the netting and the position of the knots. Estimates of the flexural rigidity of the netting twine can be made from these data. We present the results of the analysis of Mediterranean polyamide netting, and standard and Brezline polyethylene (PE) netting from the North Sea. In all netting, regardless of the material used, EI increases with increasing linear density. Furthermore, Brezline is much stiffer than standard green PE, although they are equally thick.

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“…and A7. + dM_ d e to the yam bending on the plane Oxy, with their vect rial directions along the axis z; and the socalled &dquo;c rcive&dquo; or &dquo;friction&dquo; moment M~, and Mo + dMo ue to the bending tendency caused by the compone t of yam torsional moment Q in the y direction [6]. The equations of the equilibrium for moments acting on the yatn element ds are then In Equation 4, the component of yam torsional moment Q ir1 the y direction, (~j3, tends only to bend the yam element on the plane Oxz.…”

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confidence: 99%

“…In the absence of any equation of yam coercive moment Mo for rotor spun yarns, it is reasonable to suppose that Leaf's equations [6] from his filament yarn model, which is similar to the ideal yam model [5], are also applicable for rotor spun yam. This is because the effect I of wrapping fibers is eliminated by introducing the correction factor c f to account for the number of fibers in the core part of the rotor spun yam.…”

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confidence: 99%

Modeling the Twist Level at the Peeling Point in Rotor Spinning

Huang

2003

Textile Research Journal

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By analyzing yarn motion and yam dynamics in rotor spinning, this paper provides an analytical model to determine the twist level at the peeling point in rotor spinning. The model shows that the twist level of the yam arm near the peeling point obviously declines, mainly because its bent shape acts like a "virtual twist blockage device," to such an extent that the twist level at this point is even lower than that of machine twist. The twist level at the peeling point for finer yams can be higher than that for coarser ones, because of the multiple effect of yarn linear density, rotor speed, and rotor diameter, etc. This finding infers that the spinning stability of finer yams may improve if the spinning and machine

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The Friction Couple in Yarn Bending

Abstract: Yarn bending can be characterised by a flexural rigidity B and a friction or coercive couple M . This paper describes an analysis of M^^ in Icrms of filament properties, yarn twist and yarn tex. Some limited experimental data are presented in support of thc result of the analysis.

Cited by 4 publications

References 7 publications

A pilot intervention with chitosan/cotton knitted jersey fabric to provide comfort for epidermolysis bullosa patients

A pilot intervention with chitosan/cotton knitted jersey fabric to provide comfort for epidermolysis bullosa patients

Experimental method for quantifying resistance to the opening of netting panels

Modeling the Twist Level at the Peeling Point in Rotor Spinning

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