elektrostatické zvlákňování --- nanotechnologie --- textilní technologie

The objective was to control the thickness of the layer of the polymer solution onto a spinning roller. Therefore, the effect of the angular speed of the spinning roller and viscosity of the polyvinyl alcohol solution on the thickness of the layer of the polymer solution onto a spinning roller was investigated. The concentration of the solution was kept constant while changing roller angular speed; accordingly, the roller angular speed was kept constant while varying concentration and the thickness of the layer of the polymer solution was measured, respectively. Sodium chloride was added into the solution to change viscosity of the solution.The effects of roller speed and viscosity were visually observed onto the roller surface by video camera, analyzing the number of Taylor cones. Current test was also used to analyze the spinning progress. The properties of materials, such as spinning performance and fiber diameters were analyzed.It has been concluded that the thickness of the solution layer increases when the viscosity (as a function of concentration) of the solution increases. It has been also proven that the increase in the angular speed of the spinning roller causes an increase in the thickness of the solution layer onto the roller. Throughput of the product and diameters of nanofibers are both directly proportional to angular speed of the roller and viscosity of the solution. Therefore, the thicker is the layer of the polymer solution on top of the spinning roller the improved are fabric throughput and nanofiber diameter. These work proved that adding sodium chloride into polyvinyl alcohol to change its viscosity, affect, inversely, the electrospinning progress, fabric throughput and nanofibers diameters.Finally, the researcher adds roller movement and solution rheology into the family of parameters of roller electrospinning, since it affect both the spinning progress and produced material.

Study of the roller electrospinning with regard to roller movement