Finite element modeling and experimental investigation between the novel drafting and double-apron drafting systems

Abstract

The ring spinning frame featuring the double-apron drafting device is the most widely used method due to its various advantages. The finite element method and experiments were conducted to study the double-apron drafting unit and the novel drafting system. The novel drafting system is characterized by a curved drafting zone and curtate floating zone due to the elimination of the double-apron drafting unit’s double rubber aprons and the innovation of the pins. The finite element results of the double-apron drafting unit and novel drafting system demonstrate that the external friction field in the drafting zone of the double-apron drafting unit is composed of straight-line segments from the pin nip to the middle roller nip. In contrast, the force in the novel drafting system is akin to undulations and exhibits stronger and smoother distribution. In experiments, the double-apron drafting unit and novel drafting system were installed on the ring spinning and compact spinning frames, namely the double-apron drafting unit-ring spinning, double-apron drafting unit-compact spinning, novel drafting system-ring spinning and novel drafting system-compact spinning, to study the slippage rates and yarn properties. It can be seen that the slippage rates of rubber aprons in the double-apron drafting unit-ring spinning vary from 5.84% to 6.89%, while the slippage rates of the lattice apron in the novel drafting system-ring spinning range from 0.39% to 0.66%. In addition, the yarn properties produced by the novel drafting system-ring spinning and novel drafting system-compact spinning, including yarn evenness, imperfections and strength, outstrip those produced by the double-apron drafting unit-ring spinning and double-apron drafting unit-compact spinning.

Prioritizing the quality parameters of cotton carded knit yarn by varying tensions of the bottom aprons of the ring frame

“… ISM aims to design a system model highlighting its critical parts, connections, and interactions [36,15].…”

Assessing the Impact of Spacer Size Variations on the Ring-Spun Yarn Quality Ranking

“…In the case of the larger spacer size, all the above attributes are achieved, like improving regularity with decreasing imperfections and hairiness. Better control of fibre is also achieved with optimum drafting of fibres at the drafting for the larger spacer size, which increases the fibre holding properties, which is also responsible for increasing the yarn strength [63]. Another importance of large spacer size is the reduction of specially thick and thin places, ensuring better evenness [47].…”

“…The reason behind that smaller spacer size ensures fewer fibre controls at the drafting zone, causing more fibre slippage, which is the prime https://doi.org/10.31881/TLR.2023.102 responsible issue for more stretching of yarn before rupture [20]. Because of less control of fibres, they may experience increased elongation at minimum tension; however, with the large spacer size, fibres experience proper control, reducing flexibility [63]. Uneven distribution of the fibres at the small spacer size is another responsible agent for increasing the elongation percentage of the manufactured yarn [64].…”