Abstract
The ring spinning process is the most widely used method in the spinning industry. Nowadays, the labor cost become more and more expensive, and it is essential to improve productivity. For increasing the productivity, a modification of adding a pre-twister and holding roller on the traditional ring spinning system have been discussed in this paper. The computational fluid dynamics (CFD) are introduced to study the effects of pre-twister and spinning tests are implemented for verification. The numerical simulations show that the cavity conical degree and nozzle numbers of the pre-twister are the key parameters which affect the airflow fluctuation in the cavity, and have obvious effects on the resultant yarn twist. By contrast, the axial angle and tangential angle of the nozzle have less effect on the resultant yarn twist. When the fiber bundles pass by the front nip, they are affected by the vortex and result in a partially strengthened and wrapped structure which could be subsequently twisted less by the traveler and ring, so the productivity could be potentially increased. According to the spinning tests, an evident productivity increase by nearly 30% for medium cotton yarns can be achieved, and the yarns have an acceptable reduction in nearly all properties.
Highlights
Staple fiber spinning has a long history of more than 20,000 years [1]
The airflow in the pre-twister is mainly formed by two parts
We just conduct a preliminary investigation and this assumption may be a chance to improve the productivity of ring spinning
Summary
Keeping in pace with scientific technologies, many new open-end and non-open-end spinning systems such as rotor spinning, air-jet spinning, vortex spinning, and self-twist spinning have appeared in succession These new technologies have led to increases in spinning speed and, subsequently, production [2]. For the purpose of improving ring spinning productivity, Sawhney and Kimmel [12] worked on a “air-plus-ring” tandem spinning system, which could produce a low-twist, novel ring yarn at a relatively high speed. Compared with with the the conventional ring spinning system, a pre-twister and a holding roller were added to the system, which conventional ring spinning system, a pre-twister and a holding roller were added to the system, is different from thefrom former [21,22,23,24,25] whose purposes were reducing hairiness which is different theresearchers former researchers [21,22,23,24,25].
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
