Let's talk about the development history of air filters
The prototype of the air filter is a respiratory protective device used by people to protect their breath. According to records, as early as the first century in Rome, people used masks made of coarse hemp to protect mercury during purification. In the long period following this, air filters also made progress, but they were mainly used as respiratory protective equipment in some hazardous industries, such as the production of harmful chemicals. In 1827, Brown discovered the motion laws of tiny particles, which further deepened people's understanding of the mechanism of air filtration.
The rapid development of air filters is closely related to the development of military and electronic industries. During World War I, military gas masks using asbestos fiber filter paper as the smoke filter layer emerged due to the use of various chemical agents. Fiberglass filter media for air filtration was patented in the United States in October 1940. In the 1950s, the United States conducted in-depth research on the production process of glass fiber filter paper, which improved and developed air filter cartridges. In the 1960s, HEPA filters were introduced; In the 1970s, HEPA filters using fine glass fiber filter paper as the filtering medium achieved a filtration efficiency of up to 99.9998% for particles with a size of 0.13 microns. Since the 1980s, with the emergence of new testing methods, the improvement of usage evaluation, and the increasing demand for filtration performance, it has been found that HEPA filters have serious problems, leading to the emergence of ULPA filters with higher performance. Nowadays, countries are still working hard to research and it is estimated that more advanced air filters will appear soon.
The design of air filters itself has also made significant progress, with the most important being the removal of partition plates, namely the development of non partition filters. The non partition filter not only eliminates the risk of damaging the filter medium with partition plates, but also effectively increases the filtration area, improves filtration efficiency, and reduces airflow resistance, thereby reducing energy consumption. In addition, air filters have made great progress in high temperature resistance, corrosion resistance, waterproofing, and antibacterial properties, meeting some special needs.
