How to choose a mask ?
Duration of application
From the point of view of human physiological structure, because people's nasal mucosa blood circulation is very strong, the passage in the nasal cavity is very tortuous, and the nasal hair constructs a "barrier" of filtration. When the air is inhaled into the nostril, the airflow forms a vortex in the tortuous passage, which heats the airflow in the nasal cavity. Some tests show that when the cold air of minus 7 ℃ is inhaled into the lungs through the nasal cavity, the air flow has been heated to 28.8 ℃, which is very close to the temperature of the human body. If you wear a mask for a long time, it will make the nasal mucosa become fragile and lose the original physiological function of the nasal cavity, so you can't wear a mask for a long time. Masks can only be worn in special environments, such as in places where there are many people and the air does not flow. Of course, it is necessary to wear a mask when walking in the wild, in order to resist the wind, sand and cold, or in the environment with air pollution, but the time should not be too long. In addition, in the flu season, go to public places where there may be many pathogens, you should also wear masks. Wearing a mask is only one of the ways to prevent respiratory infectious diseases. The most important thing is to adhere to outstanding living habits.
Cleaning and maintenance
The outer layer of the mask often accumulates a lot of dust, bacteria and other dirt in the outside air, while the inner layer blocks the exhaled bacteria and saliva. Therefore, the two sides can not be replaced, otherwise the infected dirt in the outer layer will be inhaled into the human body when it is directly close to the face, and become the source of infection. When the mask is not worn, it should be folded and put into a clean envelope, and the side close to the nose and mouth should be folded inward. Do not put it into the pocket or hang it around the neck.
If the mask is moistened by exhaled heat or saliva, its barrier effect will be greatly reduced. Therefore, the most commonly used masks should be replaced once a day. Wash with boiling water for 5 minutes.
The mask should be cleaned and disinfected every day. Whether it is gauze mask or air filter mask, it can be disinfected by heating. The specific measures are as follows:
1. Cleaning. First, gently rub the gauze mask with warm water and soap. The bowl shaped mask can be cleaned quietly with a soft brush dipped in detergent, and then washed with clean water. Please note that do not rub hard, because if the warp and weft gap of the gauze is too large, it will lose the effect of anti droplet.
2. Disinfection. Soak the cleaned mask in 2% Peracetic Acid Solution for 30 minutes, or boil it in boiling water for 20 minutes, or steam it in a steamer for 15 minutes, and then dry it. This method is suitable for gauze masks and bowl shaped masks.
3. Check. Before using it again, you should carefully check whether the mask and mask are still intact. For gauze masks and masks, you can adopt the light transmission inspection method, that is, take care of them in front of the lamp to see if there are significant light spots, and whether the light transmission rate of the central part and the edge part is the same. If there is any doubt, you need to replace them with new ones. In any case, the masks and masks will be updated after 3 to 7 times of cleaning, and the masks with particularly good quality can be cleaned 10 times. The activated carbon adsorption mask should be replaced regularly. If the activated carbon interlayer cannot be replaced, it should be replaced after 7 to 14 days. This kind of mask can not be reused after cleaning.
