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Yarn-Mass Measurement With 1-mm-Length Samples

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5 Author(s)
Pinto, J.G. ; Dept. of Ind. Electron., Univ. of Minho, Guimaraes ; Carvalho, V. ; Monteiro, J.L. ; Vasconcelos, R.M.
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In textile production, measurement of yarn mass in the 1-mm range is of utmost importance to properly evaluate evenness, as several irregularities occur in 1-4-mm yarn length. Direct measurements in the 1-mm range are not available in commercial equipment. One of the most common, from Uster, is based on yarn samples of 8 mm. This paper presents a direct mass measurement in the 1-mm range system based on parallel capacitive sensors and signal-processing techniques for detection of periodical errors. Results point out that evaluation of yarn mass, with this approach, is feasible in the 1-mm range, allowing online measurement (1-mm yarn mass) in a spinning frame for real-time control. Despite low signal-to-noise ratio, it is possible to measure small variations of yarn mass (typical capacity variation of 2.08times10-17 F for 57 tex-0.057 g/m of yarn). As a spin-off of this project, a new low-cost control system is being prepared for detection of yarn break and bobbin end in knitting flat machines. Online quality classification is also feasible with the developed system

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Industrial Electronics, IEEE Transactions on  (Volume:54 ,  Issue: 2 )