Optimization Of The Rotor-electrospinning Device And Process Parameters

Nanofibers have also become a research hotspot for their special properties like fine diameter,high surface area to the volume ratio, which made them can be widely used in many field such asfiltration materials, biomedical, nano-sensors, etc. Currently electrospinning is the most importantand the most effective method to manufacture nanofibers. But the greatest defect ofelectrospinning is the low production, the number of jets retard mass production. This paper usedthe method of experiments exploration to study the effect of spinning-disk structure onelectrospinning, and found that rator-electrospinning device is an effective way to achievelarge-scale production.Combining with the requirements of industrialization and current development trends ofelectrospinning, a novel type of needleless electrospinning setup,―the rator-electrospinning‖, isfirst designed and developed in order to improve the yield of electrospinning and collectcontinuous nanofibres. This paper explained the difference between this novel device andtraditional electrospinning method, and put forward the basic principles of rator-electrospinningand constructed, the design of spinning-disk structure is the focus. Performed by varying differentprocess parameters and changing different spinning-disk structure to spun fibers, we determinedthe optimal parameters of the spinning process and the optimal spinning-disk structure throughanalysis the SEM.First, the PVA solution was chosen to try spinning with a plane spinning-disk, and differentspinning concentrations, additional voltage, flow rate and rotating speed of spinning-disk wereselected to do a serious of single factor experiment, the spinnable scope of each factor wereinitially identified by comparing the spinning results of each factor. Then spinning orthogonalexperiments were carried, the best experimental program and the corresponding processparameters were selected finally through analysis and verification for the results of the programs.The optimum spinning process parameters are follows：The solution concentration was10%, thespinning voltage was50kv, the rotating speed of spinning-disk was6300r/min and the flow ratewas30ml/h.After that, the spinning-disk structure was designed again based on the original one. First, a different number of grooves were engraved in the surface of spinning-disk, and then carriedparallel experiments with each new spinning-disk, eight grooves was determined as the optimalnumber of grooves by comparing the fiber morphology and output. Then the shape of groove waschanged, that is linear type, gradually narrow, rotation type and pinwheel type. Eventually thegradually narrow, the best shape for the groove was determined by comparing the fibermorphology and output. The optimum spinning-disk structure was gradually narrow with8grooves.Finally, this paper tested that the average yield is about15g/h using the device forelectrospinning with the optimum process parameters and the best spinning-disk structure. Theproduction of new device increased by nearly150times compared to the previous single-needleelectrospinning apparatus. The results showed that: the new device we designed can produce moreand finer nanofibers. It is expected that further optimization of the receiving distance,spinning-disk structure and the receiving device can improve the fineness and yield, but it is alsopossible to produce multifunctional composite webs of two or more different materials.