scholarly journals Thread Breakage in Modern Loom and Efficiency

2020 ◽  
Vol 02 (04) ◽  
Author(s):  
Mohammad Mobarak Hossain ◽  
Keyword(s):  
Relative Humidity ◽  
Significant Relation ◽  
Negative Relation ◽  
Air Jet ◽  
Breakage Rate ◽  
Air Jet Loom ◽  
Floor Temperature

The study is to find out the relation of thread breakage rate on modern loom to the relative humidity and fabric specifications. This result supports thread breakage rate increased with the choice of rapier loom instead of air jet loom. It also shows that loom width has negative relation towards thread breakage and in the production floor relative humidity has insignificant relation with thread breakage rate. Key part of the study shows that warp and weft breakage rate has interrelation. In the production floor loom types and fabric constructions are studied for thread breakage at floor temperature and found no relation to the relative humidity. But, significant relation of warp and weft thread breakage rate to EPI, loom categories, loom width, fabric length produced, weft count and interrelation between warp and weft breakage rate.

Research on the response characteristics of solenoid valve of the air-jet loom by simulation

2013 ◽  
Vol 22 (6) ◽  
pp. 606-612 ◽  
Author(s):  
Yuzhen Jin ◽  
Ruoyu Deng ◽  
Yingzi Jin ◽  
Xudong Hu
Keyword(s):  
Solenoid Valve ◽  
Response Characteristics ◽  
Air Jet ◽  
Air Jet Loom

scholarly journals Air Stream ejected from Sub-nozzles of Air Jet Loom

1996 ◽  
Vol 42 (3-4) ◽  
pp. 80-85 ◽  
Author(s):  
Ryuji Shintani ◽  
Ikuei Donjou ◽  
Kazuhide Chikaoka ◽  
Atsushi Okajima
Keyword(s):  
Air Jet ◽  
Air Stream ◽  
Air Jet Loom

scholarly journals An Investigation of Air Consumption of Air-Jet Loom

2021 ◽  
Vol 11 (1) ◽  
pp. 1-14
Author(s):  
Mohammad Mobarak Hossain ◽  
Habiba Alaya Suchona ◽  
Mst Tanzina Nasrin ◽  
Imran Hossain
Keyword(s):  
Air Jet ◽  
Air Jet Loom

Investigation into the Fabric Handle which Weaved on Air-Jet Loom by Bundle Yarn Filling Insertion Technology

2013 ◽  
Vol 821-822 ◽  
pp. 360-364
Author(s):  
Yi Weng ◽  
Hong Jun Cui
Keyword(s):  
Bending Properties ◽  
Air Jet ◽  
Fabric Handle ◽  
Air Jet Loom

Aimed to investigate the fabric handle which weaved with bundle yarn filling insertion technology, the properties of interlace resistance, flatness, friction, bending and compressing are tested. And 2 fabrics with the same size which weaved by different weaving methods on air-jet loom are analyzed contrastively. The result shows that the double wefts satin fabric which weaved with bundle yarn filling insertion technology had the adjacent interweave resistance, touched more flat and stiff compared to which weaved by traditional weaving technique. It was smoother and had better bending properties at warp orientation. But along weft orientation, it was rougher and had less bending properties.

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.

Optimization of fluid characteristics in the main nozzle of an air-jet loom

2021 ◽  
pp. 004051752110395
Author(s):  
Xinlei Huang ◽  
Lee Michael Clemon ◽  
Mohammad Saidul Islam ◽  
Suvash C. Saha
Keyword(s):  
Fluid Dynamic ◽  
Three Dimensional ◽  
Sudden Expansion ◽  
Dynamic Features ◽  
Original Design ◽  
Flow Models ◽  
Air Jet ◽  
Acceleration Tube ◽  
Air Jet Loom ◽  
Fluid Characteristics

As part of the propulsion system, the fluid dynamic features of the main nozzle can immediately affect the stability and efficiency of an air-jet loom. This study aims to optimize the fluid characteristics in the main nozzle of an air-jet loom. To investigate ways of weakening the effect of airflow congestion and backflow phenomenon occurring in the sudden expansion region, the computational fluid dynamics method is employed. Three-dimensional turbulence flow models for a regular main nozzle and 12 prototypes with different nozzle core tip geometry are built, simulated, and analyzed to get the optimum performance. Furthermore, a set of modified equations that consider the direction of airflow are proposed for better estimation of the friction force applied by the nozzle. The result shows that the nozzle core tip's geometry has a significant influence on the internal airflow, affecting the acceleration tube airflow velocity, turbulence intensity, and backflow strength of the sudden expansion region, and other critical fluid characteristics as well. Several proposed models have succeeded in reducing the backflow and outperforming the original design in many different aspects. Models A-60 and C-P, in particular, manage to increase the propulsion force by 37.6% and 20.2% in the acceleration tube while reducing the maximum backflow by 57.1% and 52.2%, respectively. These simulation results can provide invaluable information for the future optimization of the main nozzle.

scholarly journals Effect of Composition of Board and Promoter Group Retained Ownership on Underpricing of Indian IPO firms: An Empirical Study

2019 ◽  
Vol 12 (1) ◽  
pp. 21-38
Author(s):  
Ramit Anand ◽  
Balwinder Singh
Keyword(s):  
Initial Public Offering ◽  
Empirical Investigation ◽  
Ownership Concentration ◽  
Board Composition ◽  
Significant Relation ◽  
Negative Relation ◽  
Public Offering ◽  
Minority Interests ◽  
Retained Ownership ◽  
Group Post

The present empirical investigation is an addition to the existing extant literature available on the issue of initial public offering (IPO) which sees its inherent anomaly of underpricing by linking it to some of under-researched dimensions of corporate governance in the emerging economy of India. This study incorporates about 443 Indian IPO firms with their board composition and ownership retained by promoter group post IPO being primary variables of focus which are obtained from respective prospectuses of such firms. Like many previous studies, this study also keeps signalling theory as base, and findings show that only interlocking of directors among all the board variables has a significant and negative relation with underpricing. Significant relation of ownership concentration in hands of promoter group with underpricing shows that it is considered as a signal by investors assisting them in gauging safety of their minority interests. Findings show that too high insiders’ ownership alignment of interest between promoters and minority holders turn into risk of entrenchment by initial investors, that is, promoters as perceived by investors.

Flow Characteristics of the Main Nozzle in an Air-Jet Loom

1994 ◽  
Vol 64 (2) ◽  
pp. 88-100 ◽  
Author(s):  
Minoru Ishida ◽  
Atsushi Okajima
Keyword(s):  
Flow Characteristics ◽  
Air Jet ◽  
Air Jet Loom
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