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نام مقاله: Visualisation and Determination of the Geometrical Parameters of Slub Yarn

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This paper presents an analytical method of determining slub yarn geometrical parameters based on a 2D visualisation image of a slub yarn. The method can be used to adjust the slub yarn mechanism by comparing experimental results with the setting used. Geometrical size data of slub yarn are acquired by DAQ (Data Acquisition Card), and expressed as voltage signals. The dynamic threshold method is used to separate the base and slub parts, and the geometrical parameters of each part can be acquired through analysis of the new curve. The slub length can be plotted against the distance between slubs to give a 2D visualisation of any pattern in the periodicity. Characteristic lengths and spacing can be estimated from the plot. According to the experimental results, the slub length is longer and the slub distance shorter than the values set for the mechanism of the spinning frame.

Slub yarn is a kind of fancy yarn, and fabrics woven from it acquire special aesthetic properties through slub effects formed by variation in the linear density of slub-yarn [1]. Fancy yarn has been researched recently. Kwasniak [2 – 4] presented the application of a pressuried-air method for the manufacture of fancy yarns on standard rotor-spinning machines. Pouresfandiari [5] proposed and discussed a new method of producing loop fancy yarns. Wang et al. [6] researched property parameters of slub yarn. Richard [7] used an Uster Tester to evaluate the quality of slub yarn. Liu et al. [8, 9] presented a rapid and accurate approach for automatic detection of slub in fabric images using Gabor filters. Therefore it is widely used in a variety of garments and decorative fabrics. The special aesthetic characteristics of slub yarn fabric are determined by the apparent parameters of the yarn, as fancy yarns have a special structure property [10 – 12]. The parameters include the   mass decrease and the repetition pattern of the slub yarn. A kind of device (Jiangnan University: ZJ-V) was developed to produce slub yarn, and the parameters can be adjusted manually in the device. But when a specimen of slub yarn is given, it is difficult to obtain the parameters that can be used in the device. Therefore, determination of the parameters is a very important process in the analysis and manufacture of slub yarn fabric.slub length, slub distance, mass increase or

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