The Heart of the Mask-meltblown Cloth
June 3, 2020
The reason why the mask can not be made with a mask machine is because the core material of the gap mask: melt-blown cloth.
At the end of January, citing a report from China Daily, the person in charge of the mask factory in Xinxiang, Henan, said that the current price of one ton of melt-blown fabrics has risen by nearly ten thousand yuan.
On February 23, according to surging news reports, Ms. He, the head of a clothing factory in Quzhou, Zhejiang Province, said: meltblown cloth is the core of the mask. There is no product at all. The price is one price a day, and the unit price per ton has been 20,000 yuan It has risen to more than 200,000 yuan.
In just one month, many companies have switched to masks. Although the price of melt-blown fabrics has increased a lot, the shortage of melt-blown fabrics nationwide is scarce, and there are not so many melt-blown fabric supply markets. Now they are stuck in melt-blown fabrics. Cloth link.
What is meltblown
Cut a used medical mask, you will find that the mask has three layers, (inner layer) moisture absorption layer, (middle layer) core filter layer, and (outer layer) water blocking layer.
Because according to the national production regulations, medical masks contain at least 3 layers of non-woven fabrics (N95 grade masks, structurally optimized: (middle layer) the core filter layer is more, and the thickness is thicker).
Meltblown cloth, commonly known as the "heart" of the mask, is the filter layer in the middle of the mask, which can filter bacteria and prevent the spread of germs. Meltblown cloth is a film made of polypropylene with high melt index. It is a film composed of many crisscross fibers stacked in random directions. The fiber diameter ranges from 0.5 to 10 microns. one.
Are you worried that the gap in the meltblown cloth is so large, how do you filter viruses in the environment? Although the size of the new coronavirus is very small, about 100 nanometers (0.1 micrometers), the virus cannot exist independently. The main transmission routes are secretions and droplets when sneezing. The size of the droplets is about 5 micrometers. One, second, the meltblown cloth is essentially a fiber filter. When the droplets containing the virus are close to the meltblown cloth, they will also be electrostatically adsorbed on the surface and cannot penetrate.
Although the raw materials of the S layer and M layer of the mask are polypropylene-specific resins, the special materials for melt-blown fabrics differ greatly from other non-woven fabrics in the production process and performance.