In ancient times, people in the court began to cover their noses and mouths with scarves to prevent dust and respiratory pollution. It is very unsanitary to cover your nose with your hands or sleeves, and it is inconvenient to do other things. Later, some people covered their mouths and noses with a piece of silk. Kyle Poirot described his seventeen-year experience 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. In order to prevent his breath from touching the emperor's food, the waiter made a mask with a towel made of silk and gold thread.
/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.
At the beginning of the 20th century, masks became a necessity of public life for the first time. The Spanish flu that swept the world killed about 50 million people, and ordinary people were asked to use masks to resist the virus.
In the middle and late 20th century, masks were widely used. In the history of influenza, masks have played an important role in preventing and blocking the spread of germs.
1897 In March, Medesi, Germany introduced a method of covering the nose and mouth with gauze to prevent bacterial invasion. Later, someone made a six-layer gauze mask and sewed it on the collar. When in use, just turn it over and cover your nose and mouth. However, it is extremely inconvenient to hold this mask with your hands all the time. Later, someone came up with a way to tie the strap to the ear, which became a mask that people often use today.
19 10, the northeast plague broke out in Harbin, China, and Dr. Lian Dewu, then deputy director of Beiyang Army Medical College, invented the "Wu's mask".
In 2003, the use and popularization of masks reached a new climax. A SARS epidemic almost made masks out of stock. There are long queues in front of major pharmacies, and people are scrambling to buy masks.
In 2009, following the "bird flu" in 2004, "Influenza A H 1N 1" made the mask army appear again in front of the cameras of major news media in the world.
The appearance of the concept of air hazard in 2065 438+03pm 2.5 has aroused public concern about air pollution, and also made protective equipment such as masks sell well during the foggy weather.
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.
Quality supervision:
202 1 February 1 1 news. In order to ensure that the people have a happy, peaceful, healthy and safe Spring Festival, on the eve of the Spring Festival, the General Administration of Market Supervision, the Ministry of Industry and Information Technology, the State-owned Assets Supervision and Administration Commission of the State Council and the State Administration of Pharmaceutical Products jointly issued a document, and then deployed to strengthen the quality supervision of masks, requiring all localities to pay equal attention to supervision and services, strengthen the control of production sources, pay attention to supervision and inspection in the circulation field, severely crack down on illegal activities such as manufacturing and selling fake and shoddy masks, and effectively protect consumers' rights and interests; Strengthen mask quality assistance, give play to brand leading role, and promote mask quality improvement.
The four departments require all localities to attach great importance to it, earnestly enhance their sense of responsibility and mission, and take effective measures to provide safe epidemic prevention materials for the people and serve the overall situation of epidemic prevention and control and economic and social development.
Classification:
Suitable for different scenes (2 photos)
N series: there is no time limit for protecting non-oily suspended particles.
R series: the time limit for protecting non-oily suspended particles and sweat suspended particles is eight hours.
P series: there is no time limit for the protection of non-oily suspended particles and sweat suspended particles.
Some particle carriers are oily, and these substances attached to electrostatic non-woven fabrics will reduce the electrical properties and make fine dust penetrate. Therefore, the filter material of oil-proof aerosol should undergo special electrostatic treatment to prevent fine dust. Therefore, each series is divided into three grades (95%, 99% and 99.97% for short), so * * * has nine categories of filter materials.
Baidu encyclopedia-mask