What is melt blown cloth? Features of melt blown cloth

With another outbreak of the epidemic, masks once again entered people's field of vision. Today, let’s take a look at the 'heart of the mask-one by one meltblown non-woven fabric introduction. Medical masks contain at least 3 layers of non-woven fabrics. Among them, the meltblown non-woven fabric in the middle layer is the core of the mask's filtering function.' 'It has outstanding adsorption and filtration capabilities, and can block the spread of virus droplets. The production process of the melt blown cloth is very similar to the production of common marshmallows. (Sugar is added to the marshmallow machine, and the sugar is heated by the machine. After dissolving into syrup, the syrup is blown out by hot air to form extremely fine fibers.) Although the principles are the same, for the manufacture of melt blown cloth, to meet the medical protection standards, it is necessary to go through an important process-resident Extreme treatment. The following is a specific introduction: the schematic diagram of the production process of melt blown cloth Melt blown cloth uses molten polymer (such as polypropylene), and the molten polymer is sprayed from a mold with many small nozzles under high pressure. As shown in the figure, the production process of melt-blown woven fabrics generally consists of a series of operations such as polymer dissolution, melting discharge, filtration and metering, spinning and forming, winding, rolling, electret applying electrostatic charge, etc. The composition becomes the final meltblown cloth product. How does the meltblown cloth filter the new crown virus? The gap of the meltblown cloth is so large, how to filter the new crown virus with a size of about 100 nanometers in the environment? (2) There are some in the meltblown cloth production process. The first step is 'electret treatment' to make the polypropylene mesh fibers carry a sufficient amount of charge. When the virus-containing droplets are close to the meltblown cloth, the electrostatic effect is used to adsorb the particles, and the virus-containing droplets will be crisscrossed first The fiber is blocked by the static electricity and firmly adsorbed on the meltblown cloth. The electrostatic air purifier removes dust through static electricity (the electrostatic dust removal air purifier often finds a 'metal rod' inside, which is the machine's ' 'HeartUsing the characteristics of electrostatic 'adsorption' to firmly 'catch' the dust in the air, but the effect of static electricity on harmful gases such as formaldehyde is very limited. Appendix: A small history of masks At the end of the 19th century, masks began Used in the field of medical care. German pathologist Ledersch recommended that medical staff use gauze masks to prevent bacterial infections. In 1910, the plague broke out in Harbin, and the stock of masks was quickly depleted. At that time, Dr. Wu Liande, deputy supervisor of the Beiyang Army Medical College, Invented a gauze mask with a double layer of cotton yarn and a piece of absorbent cotton. This is also called a 'Wu's' mask. Today, masks have more and more diversified functions, which can meet different needs such as anti-smog and anti-pollen.