The Development History of Air Filters

The prototype of an air filter is a respiratory protective device used by people to protect their breathing. According to records, as early as the first century in Rome, people used masks made of coarse hemp for protection during the purification of mercury. In the long period after this, air filters also made progress, but they were mainly used as respiratory protective devices for some dangerous industries, such as the production of harmful chemicals.

In 1827, Bourbon discovered the motion laws of small particles, which gave people a further understanding of the mechanism of air filtration. The rapid development of air filters was closely related to the development of military and electronic industries in the 1950s. The United States conducted in-depth research on the production process of glass fiber filter paper, which improved and developed air filters. In the 1960s, HEPA filters were introduced; In the 1970s, HEPA filters using microfiber filter paper as the filtering medium had a high filtration efficiency of 99.9998 for particles with a diameter of D.3 microns. Since the 1980s, with the emergence of new testing methods, the improvement of usage evaluation, and the improvement of filtration performance requirements, it has been found that there are serious problems with HE-PA filters, leading to the emergence of higher performance ULPA filters. At present, countries are still making efforts to research, and it is estimated that more advanced air filters will soon appear.

The design of the filter itself has also made significant progress, with the most important being the removal of partition plates, which is the development of non partition filters. The non partition filter not only eliminates the danger of damaging the filter medium by the partition plate, but also effectively increases the filtering area, improves the shock efficiency, and reduces the airflow resistance, thereby reducing energy consumption. In addition, air filters have made significant progress in high temperature resistance, corrosion resistance, waterproofing, and bacterial resistance, meeting some special needs.