Understand the optimization of air filters for laminar flow cabinet

Understand the optimization of air filters for laminar flow cabinet

The prototype of an 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 for protection when purifying mercury. In the long period following this, air filters also made progress, but they were mainly used as respiratory protective devices in some hazardous industries, such as the production of harmful chemicals. In 1827, Brown discovered the laws of motion of small particles, which gave people a further 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 II, due to the use of various chemical agents, gas masks using asbestos fiber filter paper as a smoke filter layer emerged. Fiberglass filter media was obtained in the United States in October 1940 for air filtration. 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, and our purification workbenches greatly improved their filtration efficiency through HEPA filters. The HEPA filter, which uses fine glass fiber filter paper as the filtering medium, has a filtration efficiency of up to 99.9998% for particles with a diameter of 0.13 micrometers. Since the 1980s, with the emergence of new testing methods, the improvement of usage evaluation, and the increasing requirements for filtration performance, it has been found that HEPA filters have serious problems, leading to the emergence of PA filters with higher performance. At present, the filtration efficiency of the purification workbench using this filter has greatly improved compared to the original.

The design of the filter itself has also made progress, with the important aspect being the removal of partition plates, i.e. 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 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.