From the physiological structure of the human point of view, because the human nasal mucosa blood circulation is very strong, the nasal cavity is very twists and turns, nose hair from a filter barrier "When the air sucked into the nostrils, the air in the twists and turns in the channel to form a vortex So that the airflow inhaled into the nasal cavity to be heated.It was tested that the cold air at minus 7 ℃ through the nasal inhalation of the lungs, the air has been heated to 28.8 ℃, which is very close to the human body temperature. Masks, will make the nasal mucosa become fragile, lost the original physiological function of the nasal cavity, it can not wear long masks. Mask can only be worn in a special environment, for example, in the people, the air is not the place of circulation. Walking, in order to resist sand and cold, or in an air pollution environment, need to wear a mask but not too long time.In addition, the influenza epidemic season, to the existence of a large number of pathogens in public places, but also wear a mask. Wearing a mask is only one of the ways to prevent respiratory pollution, the most important to adhere to good habits.
General use of masks
Masks must be sized, wear the way must be correct, the mask will be effective. The masks sold on the market are generally divided into rectangular and cup-shaped. Rectangular mask at least three layers of paper structure to have a protective effect. The user should put the wire on the mask on the bridge of the nose, and then along the nose will spread out the entire mask, the ability to play performance. Allow the child to wear a rectangular surgical mask, because it does not have a fixed shape, if tied well, can close the child's face. Cup-shaped masks will ensure that the mask attached to the face after the density is enough, call in the air will not leak to be effective. Wear a cup-shaped mask, you can cover the hands with a mask to try to blow, check whether there is air from the edge of the mask leakage, if the mask is not tight, it is necessary to re-adjust the position and then wear.
When need to change the mask
1. Mask contaminated such as stained with blood stains or droplets and other foreign body
2. The user feels greater respiratory resistance
3. Mask is damaged
4. Dust filter cotton, mask and the user's face in good condition, when the user feels great breathing resistance, indicating that the filter has been filled with dust particles, should be new