Method of forming of highly efficient self-supporting composite filter material from polymeric micro- and nanofibres

For the first time was obtained HEPA (Highly Efficient Particulate Air), a filter of high volume filtration based on thick-layer self-supporting composite material. There was presented a method for forming a new filter in a single process step, as well as a method of testing the filtering ability of nonwoven material is described. In contrast to the existing solutions on the market, the proposed method of forming is characterized by the simplicity of the technological design, which makes it possible to use it for the production of new filters. By main parameters - filtration efficiency, pressure drop, resource, HEPA filter based on new material is not inferior to existent market analogs. Studies of the filtering ability show that such a material has a great potential of use for capturing of a wide range of sizes and open the door to new possibilities for designing and developing a self-supporting functional gradient filtering material with a predetermined parameter distribution for various gas-assisted applications.