- Jun 19, 2017 -
The prototype of the air filter is a respirator used by people to protect the breath. According to records, as early as the water quality filter in the first century of Rome, people in the purification of mercury when used to protect the mask made of hemp. After a long period of time, the air filter has also made progress, but it is mainly used as a respiratory protection appliance for some dangerous industries, such as the production of hazardous chemicals. 1827 Brown found the movement of tiny particles, people on the mechanism of air filtration have a better understanding.
The rapid development of air filters is closely related to the development of the military industry and the electronics industry. During the First World War, due to the use of various chemical agents, asbestos fiber filter paper as smoke filter layer of military gas masks came into being. The glass fiber filter media was used in air filtration in the United States in October 1940 to obtain a patent. 50 years, the United States on the glass fiber filter paper production process carried out in-depth study, the air filter has been improved and developed. 60 years, HEPA filter came out; 70 years, the use of fine glass fiber filter paper as a filter medium HEPA filter, 013 micron particle size particle filtration efficiency as high as 99.9998%. Since the 1980s, with the emergence of the new test method filter structure diagram, the use of evaluation to improve and improve the performance requirements of the filter, found HEPA filter there are serious problems, and then produced a higher performance ULPA filter Device. Countries are still trying to study, it is estimated that there will soon be more advanced air filter.
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