Buy a mask raw material video to talk about.

Whether the newly bought mask smells normal depends on the reason. The reason for odor is that non-woven fabrics are formed by stretching polypropylene particles or powder. Polypropylene itself is non-toxic and tasteless, and its raw material is polypropylene granules, which produce odor due to its own degradation and the use of additives in the production process.

Furthermore, in the mask production process, such as lace processing, ultrasonic welding at high temperature will produce aldehydes and ketones and other odorous substances. When you buy a mask, open the package and smell it to see if there is any peculiar smell. Because the smell is related to the quality of raw materials, it is recommended to choose a regular brand.

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How long can the mask last?

From the physiological structure of human body, because the blood circulation of nasal mucosa is very strong, the passage in nasal cavity is very tortuous, and nasal hair constitutes a "barrier" for filtration. When air is inhaled into the nostrils, the airflow forms a vortex in the tortuous channel, which warms the airflow inhaled into the nasal cavity.

Experiments show that when cold air at minus 7℃ is inhaled into the lungs through the nasal cavity, its airflow 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 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 circumstances, such as crowded places with poor ventilation.

Of course, you need to wear a mask when walking in the wild, in order to prevent wind, sand and cold, or to move in an environment with air pollution, but the time should not be too long. In addition, in the flu season, you should wear a mask when you go to public places where there may be a lot of pathogenic bacteria. Wearing a mask is only one of the ways to prevent respiratory infectious diseases, and the most important thing is to maintain good living habits.