Statistical and computational intelligence tools for the analyses of warp tension in different back-rest oscillations

Turhan, Yıldıray; Tokat, Sezai; Eren, Recep

doi:10.1016/j.ins.2007.06.029

Cited by 14 publications

(12 citation statements)

References 14 publications

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“…The size and variation of yarn tension directly affect the quality of textiles and the production efficiency. The excessive yarn tension makes the yarn decapitations increase, while the inadequate yarn tension affects the roll forming [2]. Therefore, it is important to develop sensor to measure and control yarn tension.…”

Section: Introductionmentioning

confidence: 99%

Compensated SAW Yarn Tension Sensor

Lü

Chen

2014

IEEE Trans. Instrum. Meas.

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The measurement and control of yarn tension is important in textile technology. This paper presents a two channel architecture surface acoustic wave yarn tension sensor, which is able to provide a sensitivity about two times bigger than the previous one. The design and the fabrication of the devices are also presented. A mathematical analysis shows that the output frequency of the sensor varies linearly with the yarn tension. To test the performance of the sensor, an experiment is carried out to obtain the output frequencies in different yarn tension. The results show that the sensor has a sensitivity of 8234 Hz/N (80.75 Hz/gf), and the sensor is capable of measuring a range of 0-0.196 N (20 gf) yarn tension with a relative error of 2% and a hysteresis error of 3%.Index Terms-Surface acoustic wave (SAW), yarn tension sensor.

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Section: Introductionmentioning

confidence: 99%

Compensated SAW Yarn Tension Sensor

Lü

Chen

2014

IEEE Trans. Instrum. Meas.

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“…If the tension is higher than the warp yarn can bear, the number of yarn breaks increases and thus, the weaving efficiency decreases. For a satisfactory weaving, the tension levels during weaving can be changed by several mechanical settings like amount of back-rest oscillation, shed crossing and shed stroke [20]. Warp yarns showed higher pull-out forces than weft.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of shed geometry on starting mark of woven fabric

2020

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This paper aims to analyze the formation of starting mark on loom and the effect of shed geometry formed by warp yarns under various conditions. The actual cause of starting mark in woven fabric is variable pick spacing and cloth-fell displacement due to the relaxation nature of the warp yarn and fabric and the loom's dynamic characteristics after restarting. Herein, nine woven fabrics of different constructions, compositions are used on an air-jet loom with a series of settings. Three shed angles were selected for specific warp yarn count, and other loom settings like heald frame height, back-rest height and depth, air pressure, take-up correction, automatic start offset, stop position were triggered to change the shed geometry, and then the effect of starting mark on fabric was checked. The pick spacings were then measured from fabric using a projection microscope, whereas various plots were generated utilizing the obtained data to check the pick spacing variation after a certain period of loom stoppage and restarting. Finally, the experimental results were analyzed with standard deviation, coefficient of variation % analysis using the IBM SPSS statistical program.

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“…al. (Turhan Y, 2007) presented experimental, computational intelligence based and statistical investigations of warp tensions in different back-rest oscillations. To have different backrest oscillations, springs with different stiffness were used.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Backrest Roller on Warp Tension in Modern Loom

Ahmed

Sowrov²,

Alam

2017

ESJ

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The Backrest roller is one of the key parts of the weaving machine. In this study, the effect of the various position of backrest and dropper has been assessed. The tension is measured by using the integrated tension measuring device of the loom. The tension can be found on the display board. The effect of backrest position can be described in two different ways viz. keeping constant dropper position (distance between dropper line and backrest roller) and keeping constant dropper depth (distance between held frame and dropper line). If dropper position (distance between backrest roller to dropper line) is kept constant then the backward movement of backrest roller will entail low tension. The reason behind this is, the dropper weight will be moved toward the backrest roller and will lose its influence on warp tension. But if dropper depth is kept constant (i,e dropper line is kept intact) then the backward movement of backrest will require more tension as the influence of dropper will more on warp length. On the other hand, when backrest height is lowered then, the downward movement of backrest roller will need low tension and upward movement of backrest roller will need more tension. As the warp length and lap angle increases with the backrest height. In this paper, the whole phenomenon is explained with illustration. IntroductionWeaving is one of the most important fabric manufacturing processes. For producing good quality fabric proper warp tension is a vital need. High tension may cause high warp breakage and low tension can cause different fabric faults. For ensuring proper warp tension electronic warp control (EWC) is used in the modern loom. But changing of different loom setting points can play an important role in determining proper warp tension which may be an important tool for eliminating starting mark, weaving damage, frequent false stoppage etc.The backrest is one of the most crucial parts of loom setting. It affects the fabric properties and quality. Fabric appearances, dimensional stability, starting mark, tensile strength etc are directly related with backrest roller position. H. Tahakori Shad et. al. (H. Tahakori Shad, 2013) found that the position of backrest roller has significant effect on breaking strength, elongation at break; tear resistance, abrasion resistance, air and water permeability etc. on grey fabric along the warp but it has no significant influence on the breaking strength in the weft direction, weft yarn density, abrasion resistance, and fabric weight. To have different backrest oscillations, springs with different stiffness were used. For each spring, fabrics with various weft densities were woven, and the warp tensions were measured and saved during the weaving process. Kloppels M et. al. (Kloppels M, 2002) reported that the variations in warp yarn tension during the weaving process become smaller by the backrest roller's swinging motion. At a high speed of the weaving machine, it could be possible to obtain a suitable relationship between movements of the backrest ...

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Statistical and computational intelligence tools for the analyses of warp tension in different back-rest oscillations

Cited by 14 publications

References 14 publications

Compensated SAW Yarn Tension Sensor

Compensated SAW Yarn Tension Sensor

Effect of shed geometry on starting mark of woven fabric

The Effect of Backrest Roller on Warp Tension in Modern Loom

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