Effect of Manufacturing Parameters of Covered Yarns on the Geometry of Covering Components

Abstract

This study deals with numerical simulation of structure of covered yarns produced on a double covering machine. Four manufacturing parameters of covered yarns such as delivery speed of covered yarn, rotational speed of two hollow spindles, and core stretch ratio during wrapping were used to simulate coil length indices of both covering components. Coefficient of evenness of semi-manufactured product as a function of delivery speed of covered yarn and rotational speed of first hollow spindle was also computed. The influence of the above-mentioned process variables on the geometry of covering components was shown by means of analysis of corresponding relationships. To evaluate the intensity effect of each variable, the comparable partial differences of the proposed functions were computed. The computations were made for covered yarn structures composed of polyurethane elastomeric multifilament core wrapped with two viscose (CV) multifilament covering yarns.

The structural and tensile properties of glass/polyester co-wrapped hybrid yarns

“…This is the main important reason of increasing the hybrid yarn tenacity and breaking load. It appears that after increasing this factor to an optimum value, the larger amount will cause inter-fiber friction force plays a negative effect in the structure of hybrid yarns [19,25–28]. This trend does not apply to the hybrid yarns with P3 wrapping filament.…”

“…However, as it is clear from Figure 11, the component of wrapper stress which is the source of lateral force exerted to the core fiber is increased and the core will be more compacted.

Figure 11.The geometry and forces acting on a wrapping pitch [28–30].

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Towards Truly Wearable Systems: Optimizing and Scaling Up Wearable Triboelectric Nanogenerators

“…Partially drawn yarn can be used in the texturing process to increase the bulkiness and the surface area by introducing extra length of loops and neps into the yarn, which could enhance TENG output performances ( Cayuela et al., 2012 ; Choi and Kim, 2015 ; Sengupta et al., 1995 ). Yarn covering is another process used in the textile industry to wind a cover yarn around a stretchable or conductive core yarn, and this process has the potential to develop improved core-axial materials for TENGs ( Petrulis and Petrulyte, 2009 ; Yoshimura et al., 1969 ). For instance, hollow spindle covering is a well-known method to produce single- and double-covered yarns.…”

A flame-retardant copper-clad laminate composite made of (metallocenebased cyclic olefin copolymer/glass)/ cresol-novolak epoxy with low dielectricity

“…Wrapping the as-spun mCOC yarns with a PVA bundle to form a ''PVA/mCOC single cover yarn'' (Figures 1(a) and (b)) was found to be an effective means of making a plain-weaved mCOC fabric. [15][16][17] In fact, the brittle characteristic made it impossible for the pure mCOC fibers to endure the tension and friction in the weaving process. Wrapping PVA fibers in mCOC yarn, as shown in Figure 1(a), can solve such a processing problem.…”