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How to maintain an assembled cleanroom
How to maintain an assembled cleanroomThe cleanroom isolates many pollutants from the cleanroom through its purification system. Some pollutants are not recognizable to the human eye, we can only see dust particles with a particle size greater than 50um with our naked eye, and we need to use a microscope to see dust particles smaller than 50um. For many precision manufacturing industries, such as the chip manufacturing industry, any dust particles larger than 0.1um will have an impact on the quality of the product. In this case, cleanrooms and contamination control technologies are needed to achieve a qualified production environment.The assembled clean room through the purification system to achieve the purpose of a clean air supply, but the circulating air system can only remove part of the pollution, there will still be a large number of pollutants in the role of gravity and Brownian motion caused by the accumulation of the role. Pollutants piled up on the surface are not static, the pollutants will be directly through the surface or indirectly through the air and personnel and other media with the product "contact", This "contact" will cause contamination of the product, resulting in poor products. At this point, regular cleaning and maintenance of the cleanroom becomes very necessary. The purpose of cleaning and maintenance is firstly to remove contamination and achieve the expected cleanliness when the cleanroom is designed and constructed, but finally to protect our products from contamination and thus improve the product's quality rate. We can divide the cleaning work into two categories, preventive cleaning and active cleaning. Preventive cleaning is to prevent the generation of contaminants and to prevent the introduction of contaminants from the external environment into the assembled cleanroom environment, or to make it small; to prevent the spread of contaminants in critical areas. All the preparatory measures taken for active cleaning also belong to preventive cleaning. Active cleaning, on the other hand, releases contaminants from critical areas. Here, we focus on the methods and principles of active cleaning. Depending on the tools used, active cleaning methods can be categorized into dry and wet methods. The dry method involves using a vacuum cleaner, or a dry tool or adhesion method for cleaning. Using the dry method only removes some of the dust particles; the smaller the particle, the greater the force with which it adheres to the surface, and the longer the particle remains attached to the surface, the more difficult it is to remove it. Wet cleaning is an effective complement to the dry method. Smaller particles adhering to a surface can be difficult to remove with a vacuum cleaner, which does not have the air velocity needed to remove them. In this case, the use of a dust mop or cloth with a cleaning solvent can effectively remove the contamination. At the same time, to avoid cross-contamination, cleaning should also follow the principle of cleaning from top to bottom, inside to outside, and use a linear direction partially overlapping the wiping method. |
