In situ measurement of the dynamic yarn path in a turbo ring spinning process based on the superconducting magnetic bearing twisting system

Abstract

The yarn tension and balloon form are the most important physical process parameters to characterize the dynamic yarn path in ring spinning. The present research work focuses on the in situ measurement of yarn tension in different regions of the yarn path in a developed turbo ring spinning tester with a friction-free superconducting magnetic bearing (SMB) twisting system and at an angular spindle speed of up to 50,000 rpm. The influence of different parameters, such as angular spindle speeds (15,000–50,000 rpm), yarn counts (15–40 tex) and balloon control ring (one or multiple), were evaluated to identify the influence of acting forces, for example, centrifugal forces. The effects of these process parameters were analyzed statistically using an analysis of variance. The yarn tension between the delivery rollers and the yarn guide was measured using a modified one-roller tensile yarn tension sensor. The yarn tension between the yarn guide and the SMB system was determined with an already existing optical approach at a higher angular spindle speed. As the highest yarn tension theoretically occurs between the SMB system and the cop, it was estimated in this region by measuring the coefficient of friction between the yarn and the yarn guide using the friction module of the constant tension tester equipment. The maximum balloon diameter was determined from the recorded balloon form between the yarn guide and the SMB system with respect to different angular spindle speeds. The results provide valuable information about the highest possible spinnable speed and enable a better understanding of the dynamic yarn path in the SMB spinning system.

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

“…In a recent research work, an innovative highperformance twisting and winding mechanism based on superconducting technology is presented, taking into account the dynamics of the yarn in order to overcome the main limitation of the existing ring spinning processes. 5,[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] The superconducting magnetic bearings (SMBs) work according to the principle of superconducting levitation. The unique concept of these bearings is that they possess a self-stabilizing behavior, that is, they remain fully passive devices without any necessity for position sensing and control, in contrast to the aforementioned active magnetic levitation systems.…”

“…57,63 Furthermore, comparative studies on the yarn properties utilizing the ring/ traveler and SMB twisting system were carried out and analyzed using the analysis of variance (ANOVA) method. 62 The intensive researches show that the friction-free SMB system can be an alternative to replace the existing twisting system and to alleviate the crucial frictional heat. It is expected to at least double the speed of the ring spinning machine, as there is no friction in the SMB system during operation.…”

“…However, the low mass of the traveler does not permit the dissipation of the generated heat in a short time, which results in the wear of the traveler and ring. 5,8,9…”

Biomimetic Microadhesion Guided Instant Spinning

“…By this mode, the fibers are stretched and twisted into a strand of fibers, similar to "twisting". 33 The twisted fibers are shown in Figure 4c. One can find that the fibers are united into one fiber due to the adhesion among different fibers.…”

“…The third mode of the biomimetic MAG spinning is twisted spinning, which couples the stretching with twisting movement during the process. By this mode, the fibers are stretched and twisted into a strand of fibers, similar to “twisting” . The twisted fibers are shown in Figure c.…”