Yarn Spacing Measurement in Woven Fabrics with Specific Reference to Start-up Marks

Islam, A. T.M.S.; Bandara, M. P.U.

doi:10.1080/00405009608659060

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…Several methods have been used to analyze the causes and reductions of the effect of starting marks. Apparently, relaxation of the warp and fabric and loom dynamics during the starting phase is the main cause of starting marks [6]. Cloth-fell creep depends on the duration of stoppage, as well as such factors as the warp tension, loom stopping position, beat-up force, shed geometry, take-up, let-off, reed position and the previous stressing history of the warp [7].…”

Section: Literature Reviewmentioning

confidence: 99%

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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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Section: Literature Reviewmentioning

confidence: 99%

“…where dP = changes in take-up length, dΔl = changes in Δl . Equation (6) indicates that a disturbance in the takeup dP will cause Δl and to change. If the disturbance is caused by taking up more fabric length than required, dP is positive; otherwise, it is negative.…”

Section: Effect Of Take-up and Let-off Disturbance On Fabric Causing mentioning

confidence: 99%

Effect of shed geometry on starting mark of woven fabric

2020

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“…Despite the fact that there are different methods for measuring weft density [14][15][16][17][18][19][20][21][22][23][24][25][26], there are not suitable for applying in an on-line measuring device for the control system. These methods are not able to measure weft density in uneven fabric.…”

Section: B Measuring Systemmentioning

confidence: 99%

Design and implementation of weft density feedback control system on weaving loom

Zefrehyee

Tehran

Nosraty

et al. 2013

The 3rd International Conference on Control, Instrumentation, and Automation

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Weft density has been considered as one of the most effective factors on woven fabric construction and it is influenced physical and mechanical fabric properties. Therefore, we developed a closed loop control system in a weaving machine. The manipulator element was take-up roller rotation speed. The weft density was measured by means of a special computational image processing routine. The PID control algorithm used to calculate the desired modification of take-up speed. However, the existing variable delay on the sensing weft density variation by the measuring system causes the conventional PID control system to have been disabled in providing robust action, so the control system was utilized by the Smith predictor to modify control behavior. To adjust control parameters, the function of the weaving machine has been investigated and a simulated model of the weaving process was constructed. The result of set point tracing and regulatory control in various tests indicated satisfactory performance of our new system.A. Almasi Zefrehyee was with the Textile Engineering Department,

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“…A line profile algorithm is another method of fabric weft density measurement, which is able to measure the weft density in various weave types [20,21]. In addition, other researchers have applied non-conventional methods for measuring the weft density [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

On-line Loom Weft Density Control System Design

Zefrehyee

Tehran

Norsaty

et al. 2015

Journal of Engineered Fibers and Fabrics

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Controlling the weft density in the course of weaving is of great importance in technical textiles production. In this study, a closed loop control system was designed and implemented in a weaving machine. Moreover, a PID algorithm was used in the control system. The control action starts by taking a picture from the fabric near the cloth fell. A machine vision system was prepared to calculate the number of weft yarns per inch. Based on the measured weft density, the take-up roller speed was adjusted by changing the supply voltage to the take-up motor. Because of the variable delay between the weft density measurement and cloth fell, the normal PID control system was not able to provide a robust action, and thus, a Smith predictor was utilized to modify the control behavior. The results of set point tracing and regulatory control action indicated the satisfactory performance of our novel system in various tests.

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Yarn Spacing Measurement in Woven Fabrics with Specific Reference to Start-up Marks

Cited by 10 publications

References 4 publications

Effect of shed geometry on starting mark of woven fabric

Effect of shed geometry on starting mark of woven fabric

Design and implementation of weft density feedback control system on weaving loom

On-line Loom Weft Density Control System Design

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