Yarn and fabric properties in a modified ring spinning system considering the effect of the friction surface of the false-twister

Abstract

This paper experimentally studies the relationship between the friction surface of a false-twisting unit and the quality of cotton yarns produced by a modified ring spinning system, with the adoption of the single friction-belt false-twister. The friction surface of the false-twisting unit, as a key twisting component, has been studied in terms of material, surface roughness, hardness and diameter, as well as the interaction between these factors and resultant yarn properties, with particular attention to yarn imperfections. Experimental results showed that the false-twisting unit with a short interactive path demonstrated significant reduction of yarn imperfections, especially yarn neps. With the optimal false-twisting unit, performances of the modified yarns and their knitted fabrics were evaluated and compared with the conventional ones.

A critical review on recent developments and solutions in the high-speed ring spinning process

“…This is why a false twisting device was added to impart false twist in the spinning triangle zone, that is, in the weakest point of the yarn path located immediately after the front rollers of the drafting system, to increase process stability and yarn quality. [71][72][73][74][75][76][77][78][79][80][81][82][83] Yilmaz has studied the characteristic properties of the yarn by integrating a false twisting device comprised of air nozzles between the drafting system and yarn guide to reduce the yarn hairiness up to an angular spindle speed of 10,000 rpm in the conventional ring spinning process (Figure 20). 71 The objective of integrating the pre-twisting device was to bind the projected fibers onto the yarn body by the swirling airflow in the nozzle.…”

“…A further false twisting method deals with the Nu-Torque technology based on one or two separate false twisting devices positioned between the yarn guide and delivery rollers of the drafting system in the conventional ring spinning process in order to reduce the residual torque in the yarn. [76][77][78][79][80][81][82][83][84] As illustrated in Figure 22, the drafted roving passes through the two twisting elements, that is, the false twisting device and the ring/ traveler system rotating in the same direction, to impart twist in the yarn. The preliminary single yarn is generated through the rotation of the false twister, which is untwisted just after leaving the false twister and, finally, the real twist is imparted in the yarn through the ring/traveler twisting element.…”

Stretchable, Environment-Stable, and Knittable Ionic Conducting Fibers Based on Metallogels for Wearable Wide-Range and Durable Strain Sensors

“…Stretchable wearable strain sensors have achieved growing attention in recent years due to a broad range of potential applications including human health monitoring, human–machine interfaces, and soft robotics. − Currently, conductive polymer films are commonly employed as stretchable electrodes to assemble stretchable sensors. − The resulting sensors exhibit many good properties, such as biocompatibility, real-time monitoring, non-invasive wear, etc. − Stretchable conductive fibers as one of the important conductive materials are also exploited for the fabrication of electronic devices. − As compared with film-type strain sensors, besides the features ascribed to the stretchable polymers, the sensors based on stretchable conductive fibers show some unique qualities to be directly woven into or stitched onto textiles to detect body motions in the desired direction, further providing wearing comfort and integrality to the resulting wearable sensors. − Therefore, stretchable conductive fibers can be considered as ideal candidates to develop high-performance wearable sensors. − …”

Effect of silicone based softener on fabric handle properties made by ring, rotor and MVS yarns

“…The relationship between false twist and yarn quality has been studied. It was observed that reduction in interactive path of false twisting unit improves the handle properties of yarn and the fabric (Yin et al , 2020). Ring, rotor and air vortex spinning techniques have been used for the development of spun yarn from polyester, viscose and cotton fibers.…”