Analysis of the characteristics of air–yarn coupling movement in the profiled reed groove of an air-jet loom

2021 ◽  
pp. 004051752110569
Author(s):  
Yuzhen Jin ◽  
Hailang Xiong ◽  
Jingyu Cui
Keyword(s):  
Numerical Results ◽  
Weft Yarn ◽  
Valuable Insight ◽  
Arbitrary Lagrangian Eulerian ◽  
Air Jet ◽  
Gap Ratio ◽  
Gas Consumption ◽  
Simulation Results ◽  
Gas Leaks ◽  
Air Jet Loom

The movement characteristics of yarn in the profiled reed groove of an air-jet loom can have a great impact on the performance of the fabric. Unstable yarn movement tends to lead to weft defects, as short wefts or weft breaks may occur, which could deteriorate the quality of the final fabric. In this paper, the characteristics of the yarn movement in a profiled reed groove are numerically studied. The arbitrary Lagrangian–Eulerian method is used to solve the two-way airflow–yarn interaction and the yarn is simulated with the ball–socket model. A fluctuation ratio is defined to characterize the unsteadiness of the yarn movement. Our simulation first investigates the effect of the gap ratio of the profiled reed groove (β) on the yarn movement then compares the movements of different yarn kinds. The simulation results indicate that a larger β not only decreases gas leaks (thus saves gas consumption), but also stabilizes the yarn movement. Our simulation results also show that the movement of the yarn of polypropylene is more stable than the other two weft-yarn materials. An experiment is also conducted to validate our numerical results, which shows a favorable agreement between them. Our numerical results of the yarn movement in the profiled reed groove can provide a valuable insight into the optimization of the weft insertion system of the air-jet loom.

Statistical Model for Predicting Compressed Air Consumption on Air-Jet Looms

2014 ◽  
Vol 9 (3) ◽  
pp. 155892501400900 ◽  
Author(s):  
Abdul Jabbar ◽  
Shakeel Ahmed ◽  
Tanveer Hussain ◽  
Noman Haleem ◽  
Faheem Ahmed
Keyword(s):  
Statistical Model ◽  
Compressed Air ◽  
Dominant Factor ◽  
Weft Yarn ◽  
Prediction Ability ◽  
Textile Fabrics ◽  
Air Jet ◽  
Consumption Values ◽  
Yarn Count ◽  
Air Jet Loom

Compressed air is a major component of energy costs incurred in the weaving of textile fabrics on air-jet looms. The consumption of compressed air in air-jet weaving depends on different process variables. In this study, the effect of weft yarn count, reed count, fabric width and loom speed on the compressed air consumption of air-jet loom was determined using response surface methodology. Fabric width was found to be the most dominant factor affecting the air consumption followed by loom speed, reed count, and weft yarn count respectively. A statistical model for predicting the compressed air consumption on air-jet loom was developed. The prediction ability and accuracy of the developed model was assessed by the fitted line plot between the predicted and actual air consumption values. The prediction model may be used for optimizing the production planning, estimating the share of compressed air cost in weaving a particular fabric style, and in identifying any air wastages in the weaving shed by comparing the actual compressed air consumption with that predicted by the model which was developed under controlled conditions without any air leakages.

Influence of Controlled Weft Yarn Tension of a Single Nozzle Air-Jet Loom on the Physical Properties of the Fabric

2006 ◽  
Vol 76 (8) ◽  
pp. 637-645 ◽  
Author(s):  
Hooshang Nosraty ◽  
Ali A. A. Jeddi ◽  
Mansour Kabganian ◽  
Firouz Bakhtiari nejad
Keyword(s):  
Physical Properties ◽  
Weft Yarn ◽  
Yarn Tension ◽  
Air Jet ◽  
Air Jet Loom

Experimental investigation on air-jet loom sub-nozzles for weft yarn insertion

2010 ◽  
Vol 81 (8) ◽  
pp. 791-797 ◽  
Author(s):  
G. Belforte ◽  
G. Mattiazzo ◽  
F. Testore ◽  
C. Visconte
Keyword(s):  
Experimental Investigation ◽  
Weft Yarn ◽  
Air Jet ◽  
Air Jet Loom

An investigation of some parameter effects on the internal flow characteristics in the main nozzle

2016 ◽  
Vol 87 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Yuzhen Jin ◽  
Jingyu Cui ◽  
Linhang Zhu ◽  
Peifeng Lin ◽  
Xudong Hu
Keyword(s):  
Flow Field ◽  
Textile Industry ◽  
Great Influence ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Air Pressure ◽  
Weft Yarn ◽  
Internal Diameter ◽  
Air Jet ◽  
Air Jet Loom

The air-jet loom is widely used in the textile industry and the main nozzle is one of its key components. In this paper, the influence of some parameters, including the input air pressure and the structure of nozzle core and its internal diameter, on the internal flow field of the main nozzle is analyzed. Then the optimized structure of the main nozzle is proposed from the perspective of fluid dynamics. In the present simulations, the realizable [Formula: see text] model is applied to model the internal flow field of the main nozzle. The results show that the velocity in the annular throat reaches supersonic. Moreover, the pressure at the end of the nozzle core is the lowest in the main nozzle. It is also shown that the input air pressure has little effect on the axis velocity in Zone B, but on the other hand, has a great influence on the near-wall velocity field and the axis velocity in Zone C. In addition, an optimized structure of the nozzle core is proposed in this paper. It is found that with the proposed structure, the velocity boundary layer near the wall of Zone B in the accelerating tube can be well improved, and rapid diffusion of airflow in this area can be avoided. These help increase the moving speed of the weft yarn. Last but not least, we also show that decreasing of the internal diameter of the nozzle core improves the axis velocity of the weft accelerating tube. However, it brings a stronger turbulence at the same time.

scholarly journals Tension Fluctuation of Weft Yarn in Air Jet Loom

1987 ◽  
Vol 40 (10) ◽  
pp. T99-T108 ◽  
Author(s):  
K. Yoshida ◽  
S. Kawabata ◽  
J. Hasegawa
Keyword(s):  
Weft Yarn ◽  
Air Jet ◽  
Air Jet Loom

scholarly journals Pengaruh Variasi Timing Opening Angle Terhadap Jumlah Weft Stop pada Pertenunan Kain dengan Anyaman Keper 2/1 1 di Mesin Air Jet Loom

2021 ◽  
Vol 3 (2) ◽  
pp. 65-75
Author(s):  
Filly Pravitasari ◽  
Afriani Kusumadewi
Keyword(s):  
Mouth Opening ◽  
Water Jet ◽  
Weft Yarn ◽  
Opening Angle ◽  
Important Thing ◽  
Air Jet ◽  
Air Jet Loom

In the weaving process, the process of launching the weft yarn is an important thing to consider. One of the obstacles that often occurs in the process of launching feed using a water jet loom machine is the amount of feed stuck (weft stop). The cause of the weft stop is because the process of opening the warp mouth is not clean and the weft thread slides inappropriately or too fast so that the warp mouth is in a small condition. Variations in timing opening angle of 700, 800 and 900 determine the size of the warp mouth opening, the time the weft will slide and the time the weft will arrive. From the three variations of the timing opening angle, the number of weft stops at the timing opening angle of 800 is smaller than the timing opening angle of 700 and 900, which is namely the number of big loops 0.6 times and end loops 0.8 times per hour.

Simulation of air flow–yarn interaction inside the main nozzle of an air jet loom

2017 ◽  
Vol 88 (10) ◽  
pp. 1173-1183 ◽  
Author(s):  
Akil Osman ◽  
Benny Malengier ◽  
Simon De Meulemeester ◽  
Jozef Peeters ◽  
Jan Vierendeels ◽  
...  
Keyword(s):  
Air Flow ◽  
Three Dimensional ◽  
Weft Yarn ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Air Jet ◽  
A Chain ◽  
Air Jet Loom ◽  
Insertion Process ◽  
Good Agreement

The main nozzle of an air jet loom plays an essential role in the weft insertion process. This role involves sucking the weft yarn from the prewinder and launching it into the reed. Simulating the dynamic behavior of the weft yarn inside the main nozzle involves fluid–structure interaction (FSI). In this work, one-way and two-way FSI simulations of air flow–yarn interaction inside a main nozzle have been performed. A three-dimensional model of the flexible weft yarn, consisting of a chain of line segments, and a two-dimensional axisymmetric model of the supersonic flow have been developed and coupled to perform these simulations. The results of the simulations are compared quantitatively and qualitatively with experimental results. Good agreement has been found between the results of the two-way FSI simulations and the experiment. The coupled fluid and structure models provide an effective numerical tool to optimize the geometry of the main nozzle based on the calculated motion and speed of the weft yarn.

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