The mask is introduced as follows:
Mask is a sanitary and epidemic prevention product, which is usually worn on the nose and mouth to filter the air entering the nose and mouth to block harmful gases, smells, droplets, viruses and other substances. It is made of gauze or paper.
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.
The development of masks is introduced as follows:
China is the first country in the world to use masks. In ancient times, in order to prevent dust and respiratory pollution, people in the court began to cover their mouths and noses with scarves. For example, Li Shu said, "Cover your mouth, you are afraid of meeting someone." "Mencius Li Lou" Note: "If the calligraphy is unclean, everyone will cover his nose." It is unsanitary to cover your nose with your hands or sleeves, and it is inconvenient to do other things.
Later, someone covered his mouth and nose with a piece of silk. Kyle Poirot described his 17-year experience of living in China in his book The Travels of Marco Polo. One of them said, "In the palaces of the Yuan Dynasty, people who offered food covered their mouths and noses with silk to let them breathe and not touch the food." This silk cloth covering the nose and mouth is also the original mask.
/kloc-At the beginning of the 3rd century, masks only appeared in the court of China. The waiter made a mask with a towel 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.
The changes of masks are introduced as follows:
On February 7th, 2020, in the Disinfection Supply Center of the Second Affiliated Hospital of Xi Jiaotong University, more than 30 medical staff and volunteers made masks with medical packaging non-woven fabrics, absorbent paper for instruments, N95 meltblown filter cloth and other materials.
On 20021165438+4, the State Council Press Office held a press conference to introduce that in 2020, among the main epidemic prevention materials exported, China exported 224.2 billion masks, which is equivalent to providing nearly 40 masks for everyone in the world except China.