Investigation on the motion of different types of fibers in the vortex spinning nozzle

Pei, Zeguang; Hu, Biyu; Diao, Chuanyun; Yu, Chongwen

doi:10.1002/pen.22152

Cited by 16 publications

(17 citation statements)

References 26 publications

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“…In another study of Pei et al's [34], the fiber motion simulation under the aerodynamic effects inside the vortex spinning was investigated. The researchers made a solution of coupling between the fiber and airflow together with the fiber-wall contact.…”

Section: Numerical Simulation Studies Concerning Vortex Spinning Theorymentioning

confidence: 99%

“…The numerical model was based on the motional characteristics of some fibers (cotton, viscose rayon, Lyocell and polyester fibers) inside the vortex spinning nozzle. The wrapping effects of different types of fibers were obtained by the numerical simulation and compared with the view of vortex yarn structure under the scanning electron microscope [34].…”

Section: Numerical Simulation Studies Concerning Vortex Spinning Theorymentioning

confidence: 99%

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Vortex Spinning System and Vortex Yarn Structure

Günaydin¹,

Soydan²

2017

Vortex Structures in Fluid Dynamic Problems

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Studying the yarn formation with the swirling air concept arouse of interest of the researchers for a long time because it appears to be easy to understand as a spinning principle. These kinds of systems are known as the vortex yarn spinning systems. The airjet spinning methods have been developed since it is possible to eliminate the movable elements as the spindle and the traveler in ring spinning or the centrifuge in rotor spinning. The success of Murata vortex spinning (MVS) system which is the newest system after all studies of air-jet systems has been much acceptable especially for the spinning ability of 100% cotton in high speeds (500 m/min) and the yarn structure resembling ring yarn structure rather than rotor yarns. This study summarizes the historical background of vortex spinning, the spinning principle and the structure of the yarn spun on this system, as well as the factors influencing the yarn quality and finally the developments in vortex spinning technology.

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Section: Numerical Simulation Studies Concerning Vortex Spinning Theorymentioning

confidence: 99%

Section: Numerical Simulation Studies Concerning Vortex Spinning Theorymentioning

confidence: 99%

Vortex Spinning System and Vortex Yarn Structure

Günaydin¹,

Soydan²

2017

Vortex Structures in Fluid Dynamic Problems

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show abstract

“…Qi 11 developed a new two-way coupling method to simulate the rigid and springy fiber motion in three-dimensional (3D) fluid flow calculated by the Lattice Boltzman algorithm. Pei et al 12 and Guo et al 13 adopted a fluid-solid coupling method to conduct numerical modeling and movement analysis of the flow development and the internal yarn movement in a spinning nozzle, and obtained the transient motion characteristics of filaments. However, the yarn splicing process is more complex than the spinning process in that it involves bundles of fibers twisting and the splicing effect is the macroscopic result of meso-fiber entanglement and twisting.…”

mentioning

confidence: 99%

Study on effects of structural parameters on untwisting performance in pneumatic yarn splicing

Shi

Chen

et al. 2015

Textile Research Journal

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The internal airflow of an untwisting chamber clearly affects the untwisting performance as determined by the appearance of the untwisted yarn end. This study established a geometric model of an untwisting chamber comprising an intake tube and untwisting tube, and adopted the renormalization-group k-" turbulence model to simulate the airflow patterns inside chamber structures having three varying parameters. These were the chamfer angle of the intake nozzle, rotation angle of the intake nozzle, and eccentric distance between the intake nozzle and untwisting tube. The chamber angle of the intake nozzle mainly induces a radial flow from the axial flow in the intake nozzle. The strength of the circumferential airflow in the untwisting tube, which is converted from the radial flow, is affected by the combined effects of the rotation angle of the intake nozzle and the eccentric distance between the intake nozzle and untwisting tube. An experimental bench that employed a high-speed camera to capture yarn movement was designed to verify the numerical results. Comparisons between simulation and experimental data show that the structural parameters of the untwisting chamber affect the airflow patterns and consequently the performance of untwisting the yarn end.Pneumatic yarn splicing used to join two separated yarn ends is a key technology for promoting yarn quality. As a complex process, pneumatic splicing can be obviously divided into an untwisting stage and a mingling stage. Firstly, a high-speed jet generated from compressed air is used to untwist two yarn ends intermingled by fibers in a helical manner, causing the yarn ends to become individual fibers, in an untwisting chamber. The two untwisted yarn ends are then dragged into a mingling chamber in an overlapping relationship using yarn clamps. Finally, another strand of airflow opposed to the rotation of untwisting airflow is applied to join the two separated yarn ends to form a neat strong yarn.There are many factors affecting the performance of the pneumatic splicing of yarn, such as the splicing inlet pressure, splicing duration, overlap length of the two yarn ends, and physical characteristics of the yarn. 1 Owing to the importance of splicing parameters, researchers have investigated the effect of such factors on the quality of twisted yarn normally characterized by strength and diameter, both experimentally and theoretically.Li presented the working principle of the pneumatic splicer and described how the factors affect the performance of splicing yarn. 2 Focusing on the dynamic response characteristic of the pneumatic actuator in the air splicer, Chattopadhyay et al. 3 realized rapidity of splicing by modifying the mechanism parameters.

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“…The airflow during rotor spinning process obey mass conservation and momentum conservation in view of fluid mechanics [9][10][11][12].…”

Section: Models and Experimentsmentioning

confidence: 99%

Effects of groove type on airflow speed and pressure during rotor spinning process

Yang

Liu

Gao

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Investigation on the motion of different types of fibers in the vortex spinning nozzle

Cited by 16 publications

References 26 publications

Vortex Spinning System and Vortex Yarn Structure

Vortex Spinning System and Vortex Yarn Structure

Study on effects of structural parameters on untwisting performance in pneumatic yarn splicing

Effects of groove type on airflow speed and pressure during rotor spinning process

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