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Do I need to wear a mask after the epidemic is over? 
【 Font Size:L M s 】【PRINT】  DATE:2020/4/30
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For ordinary people, wearing a mask is actually a very good sanitary habit, and different types of masks have different uses.

1. Cotton yarn mask: Ordinary gauze mask is a fiber mask. Its blocking principle is to isolate larger particles by layers of mechanical barriers, but it cannot block particles smaller than 5 microns in diameter. The main function of cotton masks is to protect against cold and warmth, and to avoid direct stimulation of the respiratory tract by cold air. Cotton masks have good air permeability, but they have almost no dustproof and antibacterial effects. During high epidemics and foggy weather, cotton masks have little effect.

2. Non-woven fabric mask: The electrostatically-treated non-woven fabric mask can not only block the larger dust particles, but the static charge attached to its surface can attract the fine dust by electrostatic attraction, achieving a high dust suppression efficiency. At the same time, its filter material is very thin, which greatly reduces the user's breathing resistance and has a good sense of comfort. However, the anti-bacteria of these masks is limited to preventing the infection of bacteria caused by spraying, such as the spread of bacteria caused by sneezing, and the filtering effect of PM2.5, which is a particulate matter, is limited.

3. Daily protective masks: These masks should meet the technical specifications of GB / T32610-2016 daily protective masks. According to the protection effect from high to low, it is divided into 4 levels: A level, B level, C level, and D level. The corresponding protective effects of each level are ≥90%, ≥85%, ≥75%, and ≥65%. , Suitable for protective masks worn by filtering particulate matter in the environment of daily air pollution.

4. Medical masks: General medical masks generally lack the filtering efficiency requirements for particles and bacteria, or the filtering efficiency requirements for particles and bacteria are lower than medical surgical masks and medical protective masks. The protection against pathogenic microorganisms is also relatively limited, and can be used for one-time hygiene care in ordinary environments, or for the blocking or protection of particles other than pathogenic microorganisms, such as pollen.

5. Medical surgical masks: Medical surgical masks can block particles with a diameter greater than 4 microns. The test results conducted in the airtight laboratory of the mask under the hospital environment show that, according to general medical standards, for 0.3 micron particles, medical surgical masks penetrate The excess rate is 18.3%. Medical surgical masks are suitable for basic protection of medical personnel or related personnel, as well as protection against the spread of blood, body fluids and splashes during invasive procedures. It is generally used in high-demand environments such as medical clinics, laboratories, and operating rooms. It has a relatively high safety factor, strong resistance to bacteria and viruses, and can also be used to prevent influenza.

Although it is not as effective as the N95 mask to avoid infection, medical surgical masks can prevent patients from transmitting the virus to others. The standard medical surgical mask is divided into three layers. The outer layer has a water blocking effect to prevent droplets from entering the mask; the middle layer has a filtering function to block> 90% of 5μm particles; the inner layer near the mouth and nose is used to absorb moisture.

6. Particulate protective masks: These masks should meet the requirements of GB 2626-2006 "Respiratory protective equipment self-priming filter anti-particulate respirator". Objects to be protected include dust, smoke, mist, microorganisms and other particulate matter. The mask must be marked with "GB 2626-2006 KN95". These products are classified into KN and KP according to their filtration performance. The KN class is only suitable for filtering non-oily particulate matter, including KN90, KN95 and KN100, and the filtering rates for non-oily particulate matter are ≥90%, ≥95% and ≥99.97%, respectively; the KP class is suitable for filtering oily and non-oily particulate matter For KP90, KP95 and KP100, the filtration rates of oily particulate matter are ≥90%, ≥95% and ≥99.97%, respectively.

7. Medical protective masks: These masks should meet GB 19083-2003 "Technical Requirements for Medical Protective Masks". For non-oily particulates (particle size 0.075 ± 0.02μm), the filtration rate is greater than 95%. Masks with anti-blood splatter and surface moisture resistance are divided into grades 1, 2 and 3. The filtration efficiency of non-oily particulates is respectively ≥95%, ≥99% and ≥99.97%. This high-efficiency medical protective mask is highly hydrophobic and breathable, and has a significant filtering effect on tiny virus-carrying aerosols or harmful fine dust. The overall filtering effect is good and the protection level is high.

In addition, there are dust masks that have protection against harmful dust aerosols and gas masks that protect respiratory organs from toxic agents, biological warfare agents and radioactive dust.

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