Download Contamination Control and Cleanrooms: Problems, Engineering by Alvin Lieberman PDF

By Alvin Lieberman

Contamination keep watch over criteria and methods for all stages of the construction of high-technology items are spelled out during this applications-orientated advisor. useful cleansing equipment for items and procedure fluids are followed by means of pointers on determining operations in keeping with financial system and potency. factors of contaminant dimension units conceal operation, blunders resources and remedial equipment. Engineers will locate important facts on contaminant assets, in addition to insurance of operations and techniques that worsen contaminant effects.

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Extra info for Contamination Control and Cleanrooms: Problems, Engineering Solutions, and Applications

Example text

Automobile manufacturing is carried out mainly in normal factory areas. However, paint facilities must be kept very clean because the ingression of atmospheric debris can damage the appearance and life of modern glossy painted surfaces. Many vehicle transmissions that may have to operate without needing new fluids replacement for many months are now built in clean areas. This occurs particularly in large, off-road hydraulic machines and in control systems. The precision positioning of components used in these machines means that the hydraulic fluids and their control assemblies must be very clean.

As noted, a variety of contaminants other than particles are a potential problem in the cleanroom. Their effects vary with the type of manufacturing operations. Organic chemical films can interfere with optical systems by modifying light transmission or can cause photographic degradation and obscure color brilliance. Formation of metal oxide or polymer reaction product formation on precise mating surfaces can cause mechanical interferences. These films can change a surface so that particulate contaminants can be attracted and/or retained to cause later damage.

1988). In areas where relative humidity is low, electrostatic charge problems range from a minor personnel annoyance to a major fire hazard. The latter situation can arise when combustible low-conductivity liquids or powders are transferred with containers and lines inadequately grounded. The presence of both electrostatic and magnetic fields can also cause problems in precise fabrication devices and in measurement instruments used in semiconductor production. Magnetic field fluctuations can cause operational variability in any tool using electron beams, including both electron microscope observation and analysis instruments, as well as in electron beam lithographic systems (Ohmi, Inaba, and Takenama 1989).

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