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Simulation Approach to Investigate the Effect of the Jet Structure and Air Pressure on the Performance of Siro-jet Spinning

Hasani H., Hasani M.

Fibres & Textiles in Eastern Europe

2012

Vol. 20, no. 3 (92)

46--50

In this paper, the effects of different parameters on the hairiness of siro-jet spun yarns, such as the nozzle pressure, the distance between the front roller nip and inlet of the nozzle, and jet structure were investigated. Using the Taguchi method, it was concluded that the factor air pressure has the strongest effect and the factor distance between the front roller nip and inlet of the nozzle does not have a significant effect on the performance of the siro-jet spinning system in reducing yarn hairiness. A computational fluid dynamics model was developed to simulate the airflow pattern inside the jets. The effect of air pressure and the jet structure was simulated using Fluent 6.3 software. The application of an air-jet nozzle reduces yarn hairiness by 40%.

Badano wpływ na włochatość przędzy takich parametrów jak: ciśnienie w dyszy, odległość pomiędzy wałkiem przednim a wejściem do dyszy, struktura dyszy. Stosując metodę Taguchi, stwierdzono, że ciśnienie powietrza ma największy wpływ na przebieg przędzenia i redukcję włochatości w analizowanym systemie przędzenia, natomiast odległość pomiędzy wałkiem przednim a wejściem do dyszy nie ma istotnego wpływu. Opracowano obliczeniowy model dynamiki przepływu umożliwiający symulowanie rozkładu przepływu powietrza w dyszy. Do obliczeń stosowano program Fluent 6.3. W wyniku zastosowania odpowiednio zaprojektowanej dyszy można obniżyć włochatość o 40%.

Physical characteristics of cotton/polyester core spun yarn made using ring and air-jet systems

Pramanik P., Patil V. M.

Autex Research Journal

2009

Vol. 9, no. 1

14--19

The manufacture of core yarn from polyester-cotton is one of the most important developments in the textile industry. The use of core yarns is mainly aimed at improving the strength, comfort, durability, aesthetics, and other functional properties of the final yarn. This article reports the results of investigation of core spun yarns made from polyester filament as core and cotton as sheath material manufactured using both ring and air-jet spinning systems. Polyester filaments with different proportions were chosen for the core component and cotton was used as the sheath. A total of twelve different core yarns were made on different spinning systems (i.e. six on air-jet and six on ring frame systems) and the yarn properties were compared with those of 100% cotton ring-spun yarn. It was observed that core yarns had improved physical properties compared to 100% cotton ring-spun yarn in many respects such as yarn strength, elongation, energy to break, and yarn imperfections. Only air-jet core yarn showed lower yarn strength than 100% cotton yarn but the same yarn excelled in other properties compared to 100% cotton yarn.