N95 mask with valve
First we have to clarify what the purpose of our mask is, and secondly we have to clarify the working principle of the mask. We know that the transmission of New Coronavirus is mainly droplet transmission and contact transmission. Therefore, the first purpose of wearing a mask is to stop the spread of droplets, prevent the discharge of secretions from the patient, and prevent bacteria, viruses, etc. from sucking them into the respiratory tract through the nose and mouth, so the mask plays a protective role.
In addition, surgical masks or N95 masks have a filter layer in the internal structure of the mask, which can filter out very small particles, such as small particles such as bacteria and viruses, can be filtered out, so wearing a mask plays a protective role .
Structure of the mask
Normal masks have a three-layer structure. The innermost layer is usually white, which is close to our noses and mouths. It is a soft layer structure that can absorb water, so you will see it after wearing the mask for a long time. It's wet. The outermost layer is often colored, generally light blue, and waterproof, just like a raincoat, so it can physically block some sprayed droplets or liquids. The middle layer is the filter, which is the core part of the mask. According to the size of its aperture, it is defined as a different model. For example, N95 masks can filter more than 95% of small diameters above 0.3 microns. Particulate matter, including viruses and bacteria.
Why are valves required for masks?
Because of the filtering effect of the mask, the air does not enter the respiratory tract so smoothly. Therefore, when this mask is worn on our face to protect the nose and mouth, people will feel uncomfortable after a long time. Generally, there is a little resistance when you inhale, and you feel that you cannot breathe in, and the inhalation is not sufficient. When you exhale, the airway gas is difficult to be discharged into the air. There is always hot air on the face. For example, a person wearing a mask wears glasses in winter, and often heat will cause a layer of fog on the glasses, so that people will feel very uncomfortable.
So someone has designed a mask with a valve. This mask has a valve on it. This valve is unidirectional, which means that when inhaling, air enters our respiratory tract and must pass through the three-layer structure of the mask. But when exhaling, the valve of this valve opens, so the exhalation goes smoothly into the air. Therefore, a person wearing this mask will feel comfortable immediately, because the exhalation is effortless. This is the origin of valve masks.
Can I wear a valve mask?
If I ask if I can wear this mask again, I think the scientific answer is to distinguish its purpose. In other words, if you have been in quarantine for half a month, you have n’t been out during the Chinese New Year period, and you have n’t been in contact with someone from Wuhan or someone who has been sick. Then the purpose of wearing a mask is to protect you from infection That is to say, the purpose of wearing a mask is to prevent viruses in the air from inhaling your respiratory tract, so it is relatively comfortable and safe to bring this type of mask with a valve.
However, if you are a patient or a suspected patient, if you wear this mask, the breath you exhale does not pass through the three-layer structure of the mask and directly enters the air through the valve, then the surrounding air may be If there is a virus, it will spread the infection to others, so do not wear such a mask.
In short, for most healthy people, wearing a valve mask is safe, because the virus is transmitted through droplets and contact transmission. For patients, it is best not to wear such a mask.
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