Polypropylene melt blown material is a kind of film made of polypropylene with high melt index and many crisscross microfibers stacked in random direction. This random distribution structure of fibers provides many opportunities for thermal bonding between fibers, which will make the surface area of melt blown materials larger and the porosity higher (≥ 75%).

　　After high-voltage electret electrostatic treatment, polypropylene melt blown material has the characteristics of low resistance and high dust tolerance. It is an indispensable material for medical masks. It is used to filter micron particles such as dust, haze and bacteria. It can be called the "heart" of masks. Especially under the influence of COVID-19 today, polypropylene melt blown material has become one of the most important materials in the market.

　　The fine fiber diameter of polypropylene melt blown material ranges from 0.5 to 10 microns, and its fiber diameter is about one thirtieth of that of hair. Many people have doubts here. COVID-19 is small in size, about 0.1 microns, smaller than the diameter of polypropylene melt blown fiber. How is it blocked by melt blown cloth?

　　The answer is very simple. The virus cannot exist independently. Its transmission routes mainly include secretions and droplets when sneezing. The size of droplets is about 5 microns. In addition, polypropylene melt blown material is essentially a fiber filter. When the droplets containing virus are close to polypropylene melt blown material, they will be statically adsorbed on the surface and cannot pass through, so as to isolate the virus.

　　Qingdao yishibao Plastic Co., Ltd. is one of the earliest professional companies specializing in the R & D and production of plastic color masterbatch and plastic modified materials in China. If you want to know more about polypropylene melt blown material, you are welcome to consult.