Effect of Nozzle Structural Parameters on Hairiness of Compact-Jet Yarns

Abstract

Hairiness significantly influences the appearance of yarns and fabrics. New methods and spinning systems have been offered to reduce it. Nevertheless, there is still the quest for easy, low-cost processes to produce good quality yarns with reduced hairiness. Therefore, due to its considerable importance for spun yarns, we worked on a new spinning method to decrease yarn hairiness. Many researchers have been studying the use of air nozzles in the spinning and also the winding processes, and they indicated that hairiness decreases by up to 40-50%. From this point, we investigated the use of an air nozzle on a compact spinning system and discussed the effect on yarn hairiness. The nozzle was positioned at the exit of the drafting system on a RoCoS compact spinning system and pressurized air was fed into the nozzle by the compressor during spinning. We called the combination of an air nozzle and a compact spinning system a Compact-Jet spinning system. In the literature, there are no such trials. At the end of the study, it was determined that a Compact-Jet spinning system truly improves hairiness by up to 40% in comparison to the compact spinning system and by up to 70% compared with the conventional ring spinning system. Regarding the nozzle structural parameters, the changes in hairiness indicate that the main hole diameter and nozzle outlet design make the most important contributions in reducing yarn hairiness; whereas the injector angle and nozzle head type show weaker effects. As a result, the Compact-Jet can be considered as an innovative spinning system providing the opportunity to produce less hairy yarn. Additionally, we believe that this study makes an important contribution to the research activities in the spinning field and its associated literature.

Improvement in yarn hairiness by the siro-jet spinning method

“…Therefore, a smaller diameter should be adopted under sufficient spinning conditions. 10,40,41 From this point, our findings are similar to previous studies. On the other hand, the effect of main hole diameter on yarn hairiness was found to be statistically insignificant.…”

“…In this study, we used the angles of 15 and 45 due to their better hairiness results determined in the previous studies regarding Jetring and Compact-jet spinning systems. 8,10 The injectors were positioned at 15 and 45 angles with respect to the vertical axis, which is the perpendicular to the nozzle axis, and so they lie tangentially to the main hole of the nozzle. Air entered at the angles of 15 and 45 to the main hole.…”

“…In the Jetring and Compact-jet spinning systems, the aim is to bind the projected fibers onto the yarn body using the swirling airflow in the nozzle and to reduce the yarn hairiness. Many researchers determined that the Jetring and Compact-jet spinning systems are capable of producing yarns with improved yarn hairiness compared to that of the conventional ring spun yarns: [4][5][6][7][8][9][10] hairiness decreased by up to 40-50%. 8,9,[11][12][13] Similar to the spinning process, it was shown that nozzle usage improves the yarn properties; in particular, yarn hairiness decreases significantly after winding.…”

The effects of structural parameters on tangentially injected highly swirling turbulent tube air flow

“…In recent years, the development of modified spinning systems with the addition of air nozzles to various spinning systems and research on the effect of these systems on yarn properties are being studied. These systems, which are developed depending on the spinning system where air is used, are named with Jetring, NozzleRing, Compactjet [5,34] and Siro-jet [5,33,[35][36][37]. Figure 1 shows an air jet nozzle mounted on the Siro-jetsystem.…”

Optimization of Break Draft, Pin Spacer and Rubber Cots Hardness to Enhance the Quality of Ring Spun Yarn Using Factorial Design

“…The quality of yarn is measured in terms of yarn evenness, yarn imperfections (thick, thin and neps), yarn hairiness and yarn tensile properties [17]. Few studies have been conducted on various spinning system parameters to optimize the yarn quality by using statistical analysis [18][19][20][21][22][23][24][25][26][27].…”