The development history of air filters

The prototype of air filter is a respirator that people use to protect their breathing.  It is recorded that as early as the first century in Rome, masks made of coarse linen were used to protect people from mercury purification and for a long time afterwards.  Air filters have also made progress, but they are mainly used as respiratory protection devices in some dangerous industries, such as the production of hazardous chemicals.  In l827, Buben discovered the motion law of tiny particles, which made people have a further understanding of the mechanism of air filtration.  The rapid development of air filters is closely related to the development of military industry and electronic industry in the 1950s, the United States of glass fiber filter paper production process has carried out in-depth research, so that the air filter has been improved and developed.  In the 1960s, HEPA filters came out;  In the 1970s, the HEPA filter, which uses fine glass fiber filter paper as the filter medium, has a filtering efficiency of 99.9998 for particles with a diameter of D. 3 microns.  Since 1980's, with the emergence of new testing methods, the improvement of evaluation and the improvement of filtration performance requirements, serious problems have been found in HE-PA filter, so the ULPA filter with higher performance has been produced.  At present, countries are still working hard on research, it is estimated that more advanced air filters will appear soon.  

Significant progress has also been made in the design of filters themselves, the most important of which is the removal of dividers, or the development of clap-free filters.  The clapless filter not only eliminates the danger of damage to the filter media, but also effectively increases the filter area, improves the shaking efficiency, and reduces the airflow resistance, thus reducing the energy consumption.  In addition, the air filter in high temperature resistance, corrosion resistance and waterproof, antibacterial and other aspects also take great progress, to meet some special needs.