Nozzle based compact spinning

Abstract

Compact spinning is one of the most successful innovations in the 21st century in spinning industry. Today, the available dominant compact spinning systems are the pneumatic compact spinning systems, which adopt perforated drum, perforated apron or lattice apron as condensing elements. In this paper a novel pneumatic compact spinning is proposed, that is, a precisely designed nozzle as the condensing element and a holding roller were added on the conventional ring spinning frame. When a conventionally drafted roving strand passes by the front nip, it will immediately enter the cavity of the nozzle and is affected by the inside vortex, which finally resulted into a partially wrapped and thinner round structure. The structure of the fiber strands delivered from the holding roller was viewed and recorded through the consecutive pictures. The 4 cases of wrapping structure were statistical analyzed. The results show that more than 1/4 strands are in wrapped structure. The width of the fiber strand passing by the nozzle was measured, which is significantly narrowed, compared with the fiber strand before entering the nozzle. According to the principle of compact spinning, a viable yarn with less hairiness may be produced from this system.

Numerical Simulation and Analysis of Airflow in the Condensing Zone of Compact Spinning with Lattice Apron

“…Compact spinning is classifi ed into pneumatic and mechanical compacting based on the condensing principle [13]. Recently, the dominant type is the pneumatic compact spinning systems [14,15] and it is mainly classifi ed into perforated drum and lattice apron compact spinning systems [16,17].…”