Development of a new low-cost instrument for dynamic friction coefficient measurement of yarns based on the entanglement method

Wang, Tanyu; Xie, Jun; Zuo, Zhaoguang; Li, Jin; Líu, Hao; Li, Sha

doi:10.1080/00405000.2021.1964765

Cited by 1 publication

(1 citation statement)

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“…This standard approach and other recently developed instruments for the measurement of a dynamic friction coefficient, do not allow variation of the opening angle α (see Fig. 1) thus there is only limited possibility to adapt these test setups to the geometrical conditions of the knitting machine when using this analysis [15]. Another method of determining yarn-yarn friction is the hanging fiber method.…”

Section: Mathematical Description Of Yarn Frictionmentioning

confidence: 99%

Experimental Investigations on the Effect of Yarn Speed and Wrap Angle on Yarn-Solid and Yarn-Yarn Friction using Warp Knitting Machines

Bruns

Krentzien

Beitelschmidt

et al. 2022

MSF

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Warp knitting is appointed as a manufacturing method for high-performance and high-quality textiles due to its versatility and production speed. To ensure a continuous and error-free manufacturing process under highly dynamic production conditions, a high level of knowledge of the yarn and machine interaction is required. Mechanical stresses from the machine are transferred to the yarn via friction points, as well as during the stitching process from one yarn to another, where the yarn is subjected to high stresses.Therefore, the focus of this research is the investigation of the friction between the yarn and yarn guiding elements and the friction between the yarns themselves during the stitch formation. For this reason, all contact points between yarn and yarn guiding elements as well as between the yarns themselves are examined and classified. A test rig is set up to determine all occurring frictions as a function of various machine parameters.The knowledge gained and the derived analytical expressions between machine settings and occurring friction can thus become the basis for modeling the friction points of the warp knitting machine, which is also presented. Furthermore, based on the findings a design improvement of the machine can be achieved and the friction model can serve as part of a simulation model of the entire warp knitting machine, which will be the focus of further publications.

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Section: Mathematical Description Of Yarn Frictionmentioning

confidence: 99%