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'Mask Heart'-Popular Science of Meltblown Non-woven Fabrics

by:Sunshine     2021-04-11
'Mask Heart'-Popular Science of Meltblown Nonwoven Fabric 2020-07-06 08:20 1. Introduction of Meltblown Nonwoven Fabric Medical masks contain at least 3 layers of nonwoven fabrics, of which the meltblown nonwoven fabric in the middle layer is Masks can achieve the core 'heart' of the filtering function. It has outstanding adsorption and filtering capabilities and can block the spread of virus droplets. Melt-blown cloth is a kind of high-melt index polypropylene as a material, a film made of many crisscrossed fibers stacked in random directions. 2. The production process of melt blown cloth The production process is very similar to that of common marshmallows. (Add sugar in the marshmallow machine. After the sugar is heated and dissolved into a syrup by the machine, the syrup is blown out by hot air to form a very fine The fiber.) Although the principle is the same, for the manufacture of meltblown cloth, to meet the medical protection standards, it must go through an important process-electret treatment. The following is a detailed 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 out of a mold with many small nozzles under the action of high pressure. As shown in the figure, the production process of meltblown woven fabrics is generally composed of a series of operations such as polymer dissolution, melt discharge, filtration and metering, spinning, winding, rolling, electret applying static charge, etc. Become the final melt blown cloth finished product. 3. How does the meltblown cloth filter the new coronavirus? As shown in the figure, the gap of the meltblown cloth is so large, how to filter the new coronavirus of about 100 nanometers in the environment? The meltblown fabric fiber under the scanning electron microscope, the scale bar in the figure is 3μm (1) The virus cannot exist independently, and its transmission routes are mainly secretions and sneezing droplets. The size of the droplets is about 5 microns, which is one of them. (2) One step in the production process of melt blown cloth is 'electret treatmentWhen the virus-containing droplets are close to the meltblown cloth, the particles are adsorbed by the electrostatic effect. The virus-bearing droplets will be blocked by the crisscross fibers first, and will be firmly adsorbed on the meltblown cloth by static electricity. 4. Electrostatic air purifier removes dust (it can absorb droplets after 'electret treatment'). Through static electricity (electrostatic dust removal air purifier can often find a 'metal rod' inside, this is the 'heart' of the machine. This metal rod is 'pressurized' to generate high-voltage static electricity) to charge the pollutants in the air, and then use a dust collector to capture the air dust that has adsorbed the charged particles to achieve the purpose of purifying the air. Electrostatic dust removal, in simple terms, uses the characteristics of electrostatic 'adsorption' to firmly 'catch' the dust in the air, but for harmful gases such as formaldehyde, the effect of static electricity is very limited. Appendix: A small history of masks At the end of the 19th century, masks began to be used in the field of medical care. Ledersch, a German pathologist, 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. Dr. Wu Liande, the deputy supervisor of the Beiyang Army Medical College at the time, 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, the functions of masks are becoming more and more diverse. It can meet different requirements such as anti-smog and anti-pollen. For the prevention of new coronary pneumonia, ordinary disposable masks with melt blown cloth, medical surgical masks and N95 masks all have a certain filtering effect on the virus.
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