Do You Choose the Face Mask for the 2019-nCoV?

Since the outbreak of 2019-nCoV, in addition to the frontline medical staff, all walks of life have been working hard to provide assistance for the epidemic. Masks are currently difficult to find in the market, but there are many circles of friends, masks of various channels appear, and everyone cannot judge the quality of the complicated masks. Wiskind as medical face mask suppliers, conducted detailed analysis and research on the most common masks for everyone.

Let's take a look at the protagonist of this epidemic-2019-nCoV. From the picture below, you can see that the size of 2019-nCoV is less than 100nm, which is more than 10 times smaller than common bacteria. For many masks marked with 100% anti-bacteria, it is not necessarily able to prevent this coronavirus. Buy a mask You must choose well.

(Source: China CDC website)

The principle of Masks to Prevent Viruses

The size of the 2019-nCoV coronavirus is less than 100nm. The current filtration efficiency of KN95 masks can reach 95%. Many people may think that because the pores of the filter layer material of the mask are less than 100nm, this can block the virus. In fact, this guess is completely wrong. We make the gap of the filter layer material of the mask less than 100nm. After we wear the mask, it will be difficult to breathe and it is difficult to wear it for a long time. The main method of virus transmission through the respiratory tract is droplet transmission. Viral particles are generally difficult to propagate alone, and are generally wrapped in droplets for transmission. The outermost blocking layer of the mask is needle-punched cotton, which is difficult to absorb water. After the needle-punched method is used to make non-woven fabric, polar water molecules and droplets are difficult to pass, and non-polar air can be smooth. Inhalation, so that part of the droplets can be blocked independently.

The main material of the middle-layer melt-blown non-woven fabric is polypropylene, which is an ultra-fine and electrostatic fiber cloth that can capture droplets and dust. This layer of non-woven fabric is made of countless ultra-fine and electrostatic fibers that are interwoven and intertwined by the mechanical force. The droplets and dust in the jungle of fibers are like a maze, under the action of electrostatic force and van der Waals Most of them are adhered to dense fibers, which play a very strong role in adsorption. It is also the strong adsorption effect of this layer that greatly reduces the risk of infection. The quality and thickness of this layer are the most important factors that determine the filtering efficiency of the mask. When buying a mask, the middle layer can be melt-blown non-woven fabric The thickness of the mask can be used to judge the filtering efficiency and quality of the mask.

Mask Type

1. Non-woven masks: At present, there are many masks on the market with only 2-3 layers of non-woven fabrics. Even the two-layer non-woven fabrics of masks sold by some merchants are very thin, and there are many obvious holes that can be seen with the naked eye. Don't buy masks like this, the dust may not be protected, let alone bacteria and viruses.

2. Medical ordinary mask: The structure of the medical mask is divided into three layers, from the outside to the inside are the isolation layer (spunbond nonwoven fabric), the filter layer (meltblown nonwoven fabric), and the comfort layer (spunbond nonwoven fabric). However, the thickness, preparation process and mask implementation standards of each layer are different. Wiskind medical masks have been approved by the "National Medical Device Manufacturing License" and "Medical Device Registration Certificate", and have obtained the qualification for the production and operation of disposable medical masks, which is in line with CE Certification requirements.

3. Medical surgical masks: Masks that meet the standard of YY-0469-2011 are the only medical surgical masks. The structure of the medical surgical mask is divided into three layers, from the outside to the inside are the waterproof and splashproof layer (spunbond nonwoven fabric), the filter layer (meltblown nonwoven fabric), the comfort layer (spunbond nonwoven fabric). The outermost layer can block pathogens in droplets and blood, and the filter layer can absorb small viruses and bacteria to achieve the purpose of virus protection. The weight of melt-blown non-woven fabric in medical surgical mask is about 20g.

4. KN95 masks: Masks that pass the test and certification of standard GB2626-2006 are regarded as regular KN95 masks. The structure of the KN95 protective mask is also divided into three layers, from the outside to the inside are the isolation layer (non-woven fabric to block large particles), the filter layer (melt-blown non-woven fabric, adsorption of small particles and viruses), and the comfort layer (non-woven fabric increased Comfort). The outermost layer can block pathogens in droplets and blood, and the filter layer can absorb small viruses and bacteria to achieve the purpose of virus protection.

The higher the protection level of the mask, the thicker the thickness of the middle filter layer meltblown nonwoven fabric, indicating that the quality and thickness of the meltblown nonwoven fabric are the core factors that determine the protection efficiency of the mask The thickness of the innermost spunbond nonwoven fabric will also be slightly thicker.

Which mask is preferred?

There are two types of N95 / KN95 masks and medical masks. Don't blindly pursue N95 masks and give many businesses the opportunity to speculate. Ordinary people wearing medical masks can play a preventive effect.

The Correct Wearing of the Mask

1. The mask must be worn correctly to achieve effective protection. Strictly ensure that the blue waterproof layer is facing outwards. If it is reversed, the inner layer with better hygroscopicity will be exposed. It is not only difficult to block the droplet virus, but also its Comfortable habitats and breeding sites increase the risk of infection. Clean your hands before and after wearing a mask to avoid secondary pollution. Through the correct way of wearing, the face, nose and mouth and the mask can be fit to the maximum extent. Finally, the correct mask is discarded and recycled.

2. Try to use it once

After the dust and droplets are caught by the ultra-fine electrostatic fibers, it is difficult to separate them again by washing and cooking, and water washing will also damage the electrostatic adsorption capacity of the filter layer. Therefore, such masks are best used once.

3. After ventilation and disinfection, you can continue to wear

In view of the current dilemma, as long as you have not been to a crowded place or have close contact with virus carriers, you cannot reach the virus concentration faced by medical staff. You only need to disinfect the mask with alcohol, hang it in a ventilated and dry place, ventilate for a period of time, and continue to wear it next time.

4. Strengthen other personal hygiene

In addition to mask protection, due to the spread of the new coronavirus, there are also contact transmission, and possible fecal mouth transmission, aerosol transmission, we need longer, more occasions, more frequent mask protection, as much Clean your hands many times, and try not to touch your nose, mouth, and nose under the exposed environment.