Reduction of Warp Tension Fluctuation and Beat-up Strip Width in Weaving

Gu, Huang

doi:10.1177/004051758405400302

Cited by 10 publications

(8 citation statements)

References 2 publications

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“…However, the profile of warp yarn tension was obtained by using the model given in Fig. 10 which was very similar to the works of simulated model developed by Wulfhorst [9] and warp tension profile obtained by controlling the let off through evaluation program, developed by Dayik et al and the works of Greenwood (Part-II) [4,10].The average open shed yarn tension value which was reported about 2 times that of closed shed and was at per the work reported by Gu for different types of cam profiles [8]. It was also observed from the experimental measurement that the warp yarn tension remained the same at the peak value during the dwell of the cam.…”

Section: Resultssupporting

confidence: 74%

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Development of Warp Yarn Tension During Shedding: A Theoretical Approach

Ghosh

Chary

Roy

2014

J. Inst. Eng. India Ser. E

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Theoretical investigation on the process of development of warp yarn tension during weaving for tappet shedding is carried out, based on the dynamic nature of shed geometry. The path of warp yarn on a weaving machine is divided into four different zones. The tension developed in each zone is estimated for every minute rotation of the bottom shaft. A model has been developed based on the dynamic nature of shed geometry and the possible yarn flow from one zone to another. A computer program, based on the model of shedding process, is developed for predicting the warp yarn tension variation during shedding. The output of the model and the experimental values of yarn tension developed in zone-D i.e. between the back rest and the back lease rod are compared, which shows a good agreement between them. The warp yarn tension values predicted by the model in zone-D are 10-13 % lesser than the experimentally measured values. By analyzing the theoretical data of the peak value of developed yarn tension at four zones i.e. zone-A, zone-B, zone-C and zone-D, it is observed that the peak yarn tension value of A, B, C-zones are much higher than the peak tension near the back rest i.e. at zone-D. It is about twice or more than the yarn tension near the back rest. The study also reveals that the developed yarn tension peak values are different for the extreme positions of a heald. The impact of coefficient of friction on peak value of yarn tension is nominal.

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Section: Resultssupporting

confidence: 74%

“…11 [4,6,8]. It indicated a sharp rise of tension for a short period of time followed by a smooth build-up of yarn tension over a longer duration.…”

Section: Resultsmentioning

confidence: 99%

Development of Warp Yarn Tension During Shedding: A Theoretical Approach

Ghosh

Chary

Roy

2014

J. Inst. Eng. India Ser. E

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“…Granitic [25] used a simplified finite element analysis for weaving of a plain fabric process in order to assess the extent of tensile strength degradation in warp yarn. Gu [26] compared the variations in warp tension and determined that the fluctuation decreased as the length of warp at upper shed increased [26]. Glory later used a model based self-optimization (with linear regression models and analyzed Q-Q plots) for weaving to set up the loom for effective shed geometry and reducing warp tension variations [27].…”

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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“…The effects of these factors are not simultaneous and vary in duration and magnitude. Among these, the shedding and the beat-up processes bring into being considerable tension loads, and the effect of shedding is of the longest duration compared with the others (Gu, 1984).…”

Section: The Relation Between Cloth Fell Position and Pickspacingmentioning

confidence: 99%

Importance of the Cloth Fell Position and Its Specification Methods

Vatankhah¹

2010

Woven Fabric Engineering

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Reduction of Warp Tension Fluctuation and Beat-up Strip Width in Weaving

Cited by 10 publications

References 2 publications

Development of Warp Yarn Tension During Shedding: A Theoretical Approach

Development of Warp Yarn Tension During Shedding: A Theoretical Approach

Effect of shed geometry on starting mark of woven fabric

Importance of the Cloth Fell Position and Its Specification Methods

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