Airflow assisted internal conical surface distributed electrostatic spinning nozzle

Abstract

The invention discloses an airflow assisted internal conical surface distributed electrostatic spinning nozzle which belongs to the field of electrostatic spinning and mainly comprises a receiving plate, an electrical heating device, an airflow guide column, a screw, a gas interface block, a distributing plate, a chocked flow block, an internal conical surface nozzle body, a nozzle body locating pin, a temperature sensor, an airflow nozzle, a grounding electrode and a high-pressure electrostatic generator, wherein the side surface of the upper end of the internal conical surface nozzle body is provided with a spinning medium inlet and is used for being connected with a distributing plate runner, and a gap between the internal conical surface nozzle body and the airflow guide column is used for guiding a spinning medium so that the spinning medium is uniformly distributed on the internal conical surface on the lower end of the internal conical surface nozzle body. By adopting uniform distribution of an internal conical surface structure, and using a thinning effect of airflow on the internal conical surface to the spinning medium, a high-speed stretching role of airflow to jet flow, and a keeping function of hot airflow residual heat to environment temperature, the problems of fiber refining and high-efficiency spinning are well solved, and a plurality of nozzles can be used as a basis assembly of the melt electrostatic spinning industrialization through different forms of expansion combinations.

Description

technical field [0001] The invention relates to an electrostatic spinning device, which belongs to the field of electrostatic spinning. Background technique [0002] The electrospinning process is to apply a high-voltage electrostatic field between the nozzle and the receiving device, so that the charged or polarized fluid overcomes the surface tension and viscous resistance under the action of the electric field force to form a jet, and obtain ultra-fine fibers on the receiving plate. process. [0003] With the heating up of nanotechnology, the preparation of nanofibers by electrospinning has become one of the hotspots in experimental research and industrial application. At present, most of the research on electrospinning focuses on solution electrospinning. In terms of industrialization, two routes of integration of multiple single needles and solution electrospinning without nozzles have been formed. However, the single needle has the defects that the nozzle is easy to ...

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Problems solved by technology

[0008] U.S. Patent US20090121379A1 proposes electric-assisted melt blown and hot air-assisted electrospinning, and proposes to combine the high-speed stretching of hot air and the unstable thinning effect of electric field force, and increase the jet velocity of a single filament through the effect of hot air blowing. , and the effect of additional electric field force makes the fiber fineness reach about 200nm, but the nozzle used in this patent is still a single nozzle, an improvement to the single jet, and the embodiment is only for solution spinning, melt spinning Only proposed method, still has its limitations for industrial application

[0009] Chinese invention patent CN201010556163.X mentions the umbrella-shaped nozzle, which uses the conical structure to disperse the single stream into multiple streams evenly, which solves the problem of batching, but the average speed of the melt jet is still less than 2m / s , which is far less than the average jet velocity of hundreds of meters per second of melt-blown fibers, which limits the output of melt electrospinning

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