Abstract
Abstract The airflow field pattern in the condensing zone plays a vital role in the pneumatic compact spinning, which significantly affects the yarn's qualities. This study aimed to analyze the effects of the different negative air pressures on fiber condensing in compact spinning with lattice apron using ANSYS. The results of airflow simulations reveal that by increasing the negative pressure, the flow velocity increases, leading to a more tremendous increase in the transverse condensing effects. Additionally, a better convergence led to reduced fiber width and eliminated the spinning triangle. Experimental results showed that the three yarns spun with the highest negative pressure had better strength, hairiness, and evenness than those spun with lower negative pressure.
Highlights
The air negative pressure plays a very important role in compact spinning as it is utilized to condense the fiber bundle in a pneumatic compact spinning mechanism [1, 2]
To eliminate the spinning triangle, which leads to improving the quality of spun yarn in terms of hairiness and strength, a few studies have been reported [3,4,5]
The dominant type is the pneumatic compact spinning systems [14, 15] and it is mainly classified into perforated drum and lattice apron compact spinning systems [16, 17]
Summary
The air negative pressure plays a very important role in compact spinning as it is utilized to condense the fiber bundle in a pneumatic compact spinning mechanism [1, 2]. The condensing zone’s flow field pattern plays an essential role in the pneumatic compact spinning, which directly affects the qualities of yarn [18]. The flow field investigations in the condensing zone of pneumatic compact spinning have received more attention recently [19]. Recent research on the condensing zone in pneumatic compact spinning use computational fluid dynamics (CFD) [20]. Zhang et al [27] have used CFD to build a model for compact spinning with an inspiratory groove for cotton using numerical investigation calculations and characterized the flow state in the compact zone. We investigate the condensing zone of compact spinning systems with lattice apron and the effects of different negative air pressure on fiber condensing as well as the mechanical properties of yarn. A comprehensive conclusion is drawn based on the results
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