1. The dust source of the clean room
For the dust source of the clean room, in addition to the dust from the outdoor atmosphere and the dust carried by people and objects entering the clean room, the dust source in the clean room mainly comes from the clean room operator, the clean room enclosure and the clean room. Production process equipment and dust production in the production process.
1 Clean indoor workers' dust production. The dust generated by the operator is related to the materials, type, dressing situation of the clean overalls worn and the actions of the operators themselves. Therefore, the workers in the clean room must wear the prescribed work clothes and the movements are subject to certain restrictions. Under normal circumstances, when the general electronic assembly process wears a system-wide clean overalls, the amount of dust generated by the personnel is 3.5-5.0×105/person·minute, which is the most important source of dust in the clean room.
2 Clean room enclosure and dust production on the indoor surface. With the development of clean room decoration materials, wear-resistant, anti-static, and less dust-producing materials appear, and the amount of dust generated in clean indoor buildings is getting smaller and smaller. It is generally believed that the dust production per unit area of ​​the clean room is 3-5.0×104/m2·min. It can be seen that the dust generated by the building of 10 square meters is only equivalent to the dust generated by one operator.
3 Production equipment and production process dust generation: This dust production is directly related to the equipment and the production process itself. The amount of dust produced by different equipments and different production processes varies greatly.
2, clean room cleaning
1 Manual wiping method: the person cleans the floor, wall, roof and furniture and equipment surface of the clean room with a special clean cloth and pure water. This cleaning method is more thorough.
2 Dispersed vacuum cleaning method: Generally, this method is only applicable to low-level (1000, 10000, 100,000) turbulent clean room. The method is simple, flexible and convenient, and can be cleaned by this method every day after work. However, since the cylindrical high-efficiency filter in the mobile vacuum cleaner is relatively inefficient, it is not suitable for use in a high-grade clean room. In general, 500m2 clean room can be equipped with two vacuum cleaners, one for each additional 500m2, and no more than 10.
3 Centralized vacuum cleaning method: Centralized vacuum cleaning is a system consisting of a dust suction port, a pipe network, a centralized vacuum pump, and a dust collector. The vacuum pump and the dust collector are located in a special machine room. Due to the great noise, the machine room should not only be far away from the factory and office areas, but also properly sound and muffler. The vacuum pump should have no less than 2 spares. The piping of the system should be laid with a seamless steel pipe welded joint. The radius of curvature of the elbow is 4-6d, the bend must not be wrinkled, the angle of the tee should be less than 45C, there should be no cross (can be combined by 2 tees), the slope of the horizontal pipeline is 3‰, the slope to the riser and the suction Dust spots, cleaning should be set at the corner. The end of the system is a dust suction port. It is usually sealed with a cover. When in use, open the cover and insert a vacuum hose to vacuum. Generally, the suction hose has a working radius of 8 meters, and each system has 4-5 suction ports working at the same time, and the air volume of each suction port is 150 m3/hour. Centralized vacuuming does not affect the cleanliness of the room. Therefore, centralized vacuuming is often used in clean rooms with higher levels (100, 10, 1) and larger areas.
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