/kloc-At the beginning of the 3rd century, masks only appeared in the court of China. The waiter used towels made of silk and gold thread to prevent his breath from spreading to the emperor's food. /kloc-at the end of 0/9, masks began to be used in the medical field. German pathologist Ledek began to advise medical staff to use gauze masks to prevent bacterial infection.
Masks have a certain filtering effect on the air entering the lungs. Wearing a mask has a very good effect when respiratory infectious diseases are prevalent and when working in polluted environments such as dust. Masks can be divided into air filtration masks and air supply masks. Plane masks are divided into cotton masks, non-woven mask masks, polymer masks, activated carbon powder filter masks and activated carbon fiber felt masks.
Extended data:
Precautions for using masks:
Masks should be cleaned and disinfected every day, and both gauze masks and air filter masks can be heated and disinfected. The specific approach is:
1, cleaning. First, gently rub the gauze mask with warm water and soap. The bowl-shaped mask can be lightly brushed with a soft brush dipped in detergent, and then washed with clear water. Please be careful not to rub hard, because if the gap between the warp and weft of the gauze is too large, it will lose its anti-foaming effect.
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 for later use. This method is suitable for gauze masks and bowl masks.
Step 3 check. Before using it again, carefully check whether the mask and mask are still intact. For gauze masks and masks, the light transmission inspection method can be adopted, that is, to see if there is obvious light spot before taking the lamp, and whether the light transmittance of the middle part and the edge part is consistent. If in doubt, you should replace them with new ones.
4.replace it with a new one. In any case, masks and masks need to be updated after 3 to 7 times of cleaning, and masks with particularly good quality can be cleaned 10 times. Activated carbon adsorption masks should be replaced regularly. If the activated carbon interlayer cannot be replaced, it should be replaced after 7 to 14 days. This mask cannot be reused after cleaning.
Baidu encyclopedia-mask