The development of the air filter

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The prototype of the air filter is used by the people to protect the respiratory respiratory protective device. According to records, as early as in Rome in the first century, the people in the purification of mercury with the protection of mask made of hemp. Long time af ter, the air filter has also made progress, but mainly as a respiratory protective device used in dangerous industries, such as the production of harmful chemicals. 1827 Brown discovered the law of motion of tiny particles, people got a better understanding of the mechanism of the air filter.nonwoven fabric The rapid development of the air filter is closely related with the development of the military and electronic industries. During World War I, due to the use of a variety of chemical agents, military gas masks emerged as smoke filtration layer to asbestos fiber filter paper. The glass fiber filter media for air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States-depth study of the Production of glass fiber filter paper, air filter has been to improve and develop. In the 1960s, the advent of the HEPA filter; 1970s, using a fine glass fiber filter paper as filter media HEPA filters up to 013 micron size particle filtration efficiency of 99.9998%. Since the 1980s with the emergence of new test methods, the use of evaluation to improve and improve filter performance requirements found HEPA filter there is a serious problem, so he had a higher performance UL PA filter. Countries still trying to study, it is estimated that soon there will be more state-of-the-art air filters. The design of the filter itself has also made significant progress, in which the most important is the removal of the partition plate, i.e. no development of the separator filter. No partition filter not only eliminates the partition plate the risk of damage to the filter medium, but also effective to increase the filtration area, to improve the filtration efficiency, and reduces the air flow resistance, thereby reducing the energy consumption. In addition, the air filter in the high temperature, corrosion-resistant and waterproof, anti-bacteria, also take a lot of progress to meet some special needs.spunbond nonwoven