Features high efficiency air filter material
With the improvement of social progress and people's living standards, especially filter HEPA (HEPA) filter, ultra low penetration air (ULPA) filter is widely used in various fields, such as microelectronics, pharmaceuticals industry, hospitals, food industry, cosmetics industry, environmental protection industry, the nuclear industry and military fields. Air filter material research and development has made great progress, but people on the air filter material also put forward higher requirements.
The emergence and development of air filter material with the development of military and electronics industries closely related. As a military gas mask filter smoke layer of filter material asbestos fiber filter paper as early as the end of the First World War had come out. Glass fiber filter material for air filtration in October 1940 to obtain patents in the United States. In the 1950s, the US glass fiber filter paper production process conducted in-depth research, the air filter has been improved and developed. 1970s by the fine glass fiber production HEPA filter paper, 0.3um particle filtration efficiency of 99.999%. From the development of foreign air filter material point of view, the late 20th century, 70 years ago, staged air filter materials can be divided into early effect and the efficiency of two filter levels. HEPA filtration efficiency of the filter material generally require higher than 99.97%, so people think it has been able to meet the requirements. Since the 1980s, with the emergence of new test methods, the use of technology to improve the evaluation and to improve the requirements of the filter material, it was found that HEPA filtration materials are still some problems. So the new generation of ULPA filter material came into being, its 0.12um particle filtration efficiency of greater than 99.999%. In the 1990s, American companies from the application point of view of re-grading of the filter material has been adjusted, the filter material is divided into four levels: Class1000ASHRAE; Class2000Prefiher / Hos-pital; Class3000HEPA; Class5000ULPA. The latter two of which belong to the high efficiency filter material.
In China, until the late 1980s, the filter material military protective equipment used by a mostly blue asbestos cellulose, cellulose or fiberglass one single component glass fiber filter material. As asbestos as carcinogenic, have adverse effects on human health, the Western countries in the 1970s have stopped using asbestos filter material. With restrictions combustible content filter material, the glass fiber has been widely used a cellulose filter paper, the use and development has been limited. The single component glass fibers due to the simple structure, it is difficult to achieve a high level of filtration. Since the 1980s, our research staff through unremitting efforts, has developed a glass fiber filter paper HEPA and ULPA filter paper, reaching in some respects even more than the world advanced level of similar products.
