At present, most of the dust masks on the market are made of two layers of non-woven fabric inside and outside, and the middle layer is constructed of melt-blown non-woven fabric.
Filtration of fine dust mainly depends on the filter melt-blown non-woven fabric in the middle. Since the melt-blown fabric has the characteristics of being electrostatically charged, it can absorb extremely small particles. Since the dust is adsorbed on the melt-blown cloth, and the melt-blown cloth is static and cannot be washed, the dust masks are all disposable.
Dust masks belong to the first level in personal protective equipment, higher than earmuffs and protective glasses. More authoritative testing and certification include European CE certification and American NIOSH certification.
1. 3M8210 mask (N95): It complies with the National Institute of Occupational Safety and Health (NIOSH) N95 approval (N95 mask), and the particles filtered can be as small as 0.3 microns in diameter. In the test, the success rate of blocking particles with a diameter of 0.075 microns is 95%.
2. Surgical masks: usually made of three-layer non-woven fabrics, made in a sterile environment, suitable for use in operating room environments; they can block particles with a diameter of about 4 microns or more.
3. Activated carbon medical masks: The activated carbon material added to disposable masks is mainly used to block odors, not to prevent bacteria and viruses, and the respiratory resistance will increase, and the bacteria isolation function is 98%.
4. Dust-proof mask: It mainly plays the role of dust-proof, and its anti-bacteria function is general.
5. Ordinary non-woven masks: It is mainly useful for blocking larger particles. Viruses with a diameter of less than 5 microns can easily pass through, and the function of isolating bacteria is limited.
6. Air filter mask: The working principle is to make the air containing harmful substances pass through the filter material of the mask and then be inhaled by people. The structure of a filter mask is divided into two parts, one is the main body of the mask, and the other is the filter material part, including the filter cotton for dust prevention and the chemical filter box for anti-virus.
7. Ordinary gauze masks: The dust blocking principle is mechanical filtration, that is, when the dust hits the gauze, it passes through layers of barriers to block some large particles of dust in the gauze. However, fine dust, especially dust less than 5 μm, will pass through the mesh of the gauze and enter the respiratory system. Now there are some dust masks on the market. The filter material is composed of fibers charged with permanent static electricity. When the respirable dust smaller than 5 μm passes through the filter material, it will be attracted by static electricity and adsorbed on the filter material. In terms of material, it really acts as a dust barrier.
The above is the relevant knowledge about non-woven fabrics used in masks. Weifang Shuntai Textile Co., Ltd. is a professional manufacturer of non-woven fabrics. The main products are: hydrophilic non-woven fabrics, water-repellent skin-friendly non-woven fabrics, and various hole types Hydrophilic perforated non-woven fabrics and a variety of pressure point non-woven fabrics. The company's products are widely used in medical and health care, maternal and child hygiene products, adult diapers, etc. Welcome to consult.