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Sources of air pollution in cleanrooms and their transmission routes
Sources of air pollution in cleanrooms and their transmission routesDust generated by workers engaged in production in the clean room is the main source of air pollution in the clean room, accounting for about 80 to 90 percent. The amount of dust in the movement of personnel in the clean room is quite complex, according to relevant research, the amount of dust raised by personnel in static movement and strenuous exercise will differ by about 10 times. Of course, the amount of personnel dust is also very much related to clothing, clothing washing, and air showers. Dust generated by equipment and processes. Dust generated by equipment is particularly prominent in rotating equipment. Motors, gear rotating parts, servomechanical parts, hydraulic and pneumatic starter switches, or manually operated equipment all generate particles due to friction between moving surfaces of the equipment. Contamination from unfiltered supply air. A clean room near the contaminated area or clean room connected to the low-clean area or non-clean area of unfiltered air may produce cross-contamination of the clean room. In general, the clean room new, clean room alteration, or clean room replacement of the terminal filter, should be by the specification requirements for strict acceptance, check and deal with the high-efficiency filter itself and high-efficiency filters and support frame of the contact surface leakage. To ensure that the air supply system does not enter the clean room without high-efficiency filtered air. In the clean room raw materials, packaging, etc. is also a major source of contamination of the clean room. In the clean room equipment, materials, containers, and packaging should have pre-cleaning and unpacking locations and methods, as well as into the clean room procedures. However, even in strict accordance with the relevant norms and procedures of the clean room, it is still difficult to eliminate the pollutants attached to raw materials, containers, and packaging, especially some products that are difficult to clean, and pollutants on small parts are brought into the clean room. They form an important source of contamination in the cleanroom during the production process, and this aspect of contamination is often easily overlooked. |
