Numerical Simulation of the Condensing Effect of Different Suction Slots on Fiber Strands in a Compact Siro Spinning Machine with Lattice Apron

Compact spinning has emerged as a contemporary spinning technology that has garnered significant attention due to its capacity to produce yarns with excellent properties. The strategy is a variation of conventional ring spinning that seeks to get rid of the spinning triangle while improving the uniformity, strength, and hairiness of the yarn. In compact spinning, fiber condensation is achieved by negative pressure airflow, which compresses the fibers and reduces their thickness. This results in a higher packing density of the fibers, leading to stronger and more uniform yarns. In this article, we provide a comprehensive overview of compact spinning technology, covering its principle, fiber condensation method, and the types of machines used. The quality of the yarn is greatly influenced by various systems and parameters such as lattice apron, air suction slot geometry, airflow fields, and twist mechanism employed in compact spinning. We present a compendium of the various developments established in studies on compact spinning, which could serve as a platform for developing new techniques in compact spinning for the production of high-quality yarns with low economic burdens. This review discusses compact spinning, two main systems, machines, influential parameters/peripherals, disadvantages, and the future prospects of compact spinning. Additionally, we provide a summary of previous research on compact spinning, highlighting its benefits and advantages over traditional ring spinning. Furthermore, we discuss the impact of guiding devices and lattice apron type on yarn quality. We also explore the potential of three-dimensional (3D) printing technology in enhancing the performance and design of compact spinning machines.

Section: Air Suction Slotsmentioning

confidence: 99%

Compact spinning: a comprehensive review of the revolution in yarn manufacturing

Saty,

Sarkodie,

Abdalla

et al. 2024

“…As a result, numerous researchers have used the CFD method to investigate the flow field in the condensing zone and obtain the fiber strand motion trajectory with different condensing principles for various kinds of pneumatic compact spinning systems. 8,15,17–19 For instance, Han et al. 20 and Khurshid et al.…”

mentioning

confidence: 99%

Numerical and experimental approach towards an energy-efficient compact spinning system

Saty

Akankwasa

Wang

2021

Compact spinning with a lattice apron has recently become a very attractive approach for pneumatic compact yarn production spinning systems. One of the main challenges with use of this method is the high negative pressure that leads to high energy consumption. In response to this challenge, we present a numerical and experimental investigation of the effects of a three-dimensional (3D) printed guiding device on the airflow characteristics and yarn properties. Initially, the 3D numerical model of the compact spinning system was set up based on the real geometrical dimensions. Secondly, the 3D prototype was developed, simulated, and analyzed using Solidworks and Ansys. Ultimately, the design, which exhibited low negative pressure along the model domain, was adopted and then 3D printed to enable further experimental investigation. Airflow analysis results illustrated that when using the guiding device with low negative pressure, the active area of negative pressure was increased. This was due to the existence and the special design of the guiding device that prevented the decrease of the negative pressure with atmospheric pressure. This increased the transverse condensing force, which was beneficial for twisting the free-end fiber around the fiber bundle. Experimental results revealed that the three yarns spun with the guiding device achieved significant energy saving when the guiding device was used. Moreover, these yarns spun with the guiding device had better strength, hairiness, and evenness than those spun without a guiding device. The model developed can be further improved and utilized for commercial purposes, as it significantly reduces energy costs while improving yarn properties.

“…Their works concluded that the flow field distribution largely depends on the roller lattice-apron type and subsequently affects the yarn properties in the condensing zone. Han et al 25,26 studied the condensing effects of different suction slots, where parallel-shaped slots, oblique parallel-shaped slots, and V-shaped slots were studied. The fiber trajectory and flow field in the condensing zone were simulated and characterized in a compact Siro spinning machine with a lattice apron.…”

mentioning

confidence: 99%

Three-dimensional simulation and experimental investigation of three-dimensional printed guiding devices on lattice-apron compact spinning

Saty

Akankwasa

Wang

2020

The compact spinning system with a lattice apron utilizes air-flow dynamics to condense fibers in a bunch and enhance the yarn properties. One of the main challenges with this method is the lack of a comprehensive understanding of the air-flow field's effect in the condensing zone. This work presents a numerical and experimental investigation of the effects of three-dimensional (3D) printed guiding devices on the air-flow characteristics and yarn properties. Firstly, the 3D numerical model of the compact spinning system was set up based on the compact spinning machine geometrical dimensions. Secondly, different 3D prototypes were developed, simulated, and analyzed using computational fluid dynamics based on ANSYS software. The prototypes (A-type, B-type, and C-type), selected according to the simulation results, were then 3D printed to enable further experimental investigation. Air-flow analysis results in the air-suction flume area exhibiting a very high negative pressure, and the centerline zone was characterized by high velocity. Experimental results revealed that the three yarns spun with guiding devices had better strength, hairiness, and evenness than those spun without a guiding device. The model developed can be further improved and utilized for commercial purposes and is anticipated to improve compact spun yarn properties significantly.