Abstract:Melt-electrospinning experiments were conducted using device constructed by nano textile material laboratory with poly (lactic acid) as the raw material. Through the experiments, ultrafine fibers were prepared. Orthogonal design was adopted to study the impact of key technological parameters (nozzle inner diameter, voltage, spinning distance, melt temperature) on fiber formation during the spinning process. The jet motion was recorded by a high-speed camera. The microstructure of fibers was characterized by SEM. Experimental results show that the melt jet hardly whips when the spinneret is grounded, the fiber diameter is significantly affected by the spinneret radium, while spinning distance takes the second place, melt temperature and voltage lessor. Setting proper melt temperature and voltage, using nozzle with smaller inner diameter, or shortening spinning distance within a certain range would help to decrease fiber diameters. Besides, junctions between fibers are highly influenced by ambient temperature around the jet.