Determination of twisting angle of electrospun nanofiber bundle for continuous electrospinning system

Abstract

Electrospinning continuously produced twisted nanofibers with a convergence coil and a rotating ring collector. The positively charged nozzle was used in the electrospinning process to deposit electrospun fibers of polyacrylonitrile onto a rotating ring collector. By withdrawing the electrospun fibers from the rotating ring collector, it was possible to spin the electrospun fibers yarn. In this study, theoretical approaches and numerical simulations were used to determine the twisting angle of the yarn. Using the equations developed in this study, we performed numerical simulations and compared the experimental results with the numerical simulation results. Mechanical properties of the fiber bundle were analyzed for twisting angle. It was confirmed the relationship among the winding drum, the ring collector, and flux of the fibers mass per time during electrospinning in the developed system.

Electrospinning and Electrospun Nanofibers: Methods, Materials, and Applications

“…250,251 Other unique collectors, such as rotary funnel and rotary rings, have also been designed to generate nanofibers with specific structures. 252–254 In a typical example, a continuous PVDF nanofiber yarn at tens of kilometers in length has been produced using a rotary metal funnel as the collector, followed by continuously withdrawing and twisting the newly formed yarn with a winder (Figure 15F). 255 The collector can also be arranged around the spinneret rather than above or below.…”

“…The rotating rod is made of titanium to make it easy to remove the tubular coating, enabling the production of artificial blood vessels with a diameter around 3 mm. When two metallic tubes are placed in line along their axis and separated by an air gap, a seamless tube can be formed by setting the two tubes rotating at the same speed, while multifilament twisted yarn can be formed by rotating the tubes at different speeds. , Other unique collectors, such as rotary funnel and rotary rings, have also been designed to generate nanofibers with specific structures. − In a typical example, a continuous PVDF nanofiber yarn at tens of kilometers in length has been produced using a rotary metal funnel as the collector, followed by continuously withdrawing and twisting the newly formed yarn with a winder (Figure F) . The collector can also be arranged around the spinneret rather than above or below. , In one example, a cylinder collector was placed around a rotating spinneret to conduct centrifugal electrospinning.…”

Electrospun poly (lactic acid) -cotton core-shell yarns: Processing, morphology, and mechanical properties

“…This increase can be due to the improved cohesion and frictional forces between fibers over twisting. 9,[42][43][44] The Young's modulus also showed a significant increase from around 295 cN/tex for the cotton yarns with α e ∼ 2.8-325 cN/tex for those spun at α e ∼ 3.7 (See Table S1 and Tables S4 and S5).…”

“…However, at very high twist rates, because of increasing the angle of fiber deposition to the yarn axis, a decrease in tensile strength may be occurred. 9,21,[42][43][44] Hence, in the present study, mechanical properties of single cotton and core-shell (cotton-PLA) yarns were investigated to determine the effect of the twist level on the mechanical performance of the electrospun core-shell yarns. Aiming to clarify the contribution of the core yarn on the ultimate mechanical features of the coreshell yarn, besides the rotational speed of the twisting unit during the electrospinning process, the twist level of the core yarn also changed.…”

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H2 leakage

“…Its surface was coated using a polydimethylsiloxane (PDMS) solution to form a protective layer that reduces the detachment of sensing materials (PdO@ZnO) from the flexible substrate (PAN NF). [32][33][34][35] The PDMS protecting layers contribute to improving the hydrogen sensitivity, selectivity, and flexibility due to the high permeability for hydrogen (890 AE 30 barriers at 30 C), the hydrophobicity, and the elastic properties of PDMS. 36 In particular, PDMS would be an excellent protective layer for colorimetric hydrogen sensors comprising PdO@ZnO/PAN NF in the presence of water vapor and other reducing gases.…”