The importance of anti-static in electronic clean room
In the daily work of the clean room, accidents caused by static electricity frequently occur, so the anti-static ability of the clean room has become an aspect that cannot be ignored in evaluating its quality.
What is static electricity? It is due to friction and other reasons that destroy the uniform neutral state of the positive (+) negative <one) charge in the object, so that the charge is excessive and the object is in a charged state, because these charges usually do not flow , So it is called static electricity.
Accidents caused by static electricity in clean rooms have the following aspects:
1. The luminescence of electrostatic discharge can cause photosensitive damage such as photographic limbs;
2- The discharge current caused by electrostatic discharge can cause damage and malfunctions such as semiconductor components. For example, if 50 P-MOS circuits are placed in a plastic bag and shaken several times, the NAND gate will be severely broken down. 39 Block, the failure rate is up to 78%, this is because semiconductor devices are very sensitive to electrostatic discharge;
3. Electromagnetic waves generated by electrostatic discharge can cause noise and malfunction of electronic instruments and devices;
4. The mechanical phenomenon of static electricity can cause the screen holes to be blocked by dust, the spinning yarn is chaotic, the printing depth is uneven and the product is contaminated;
5. The most dangerous disaster caused by electrostatic discharge is the explosion caused by the fire source well that becomes combustible. For example, according to foreign literature statistics, of the 86,000 explosive anesthetics used in the operating room, 36 explosions occurred, of which 21 were caused by static electricity. ;
The generation of static electricity accidents mainly lies in the generation and accumulation of static electricity, and the flow of airflow, the friction between the airflow and the pipe, the tuyere, the filter, the friction between the human body and the clothes, the friction between the clothes, the grinding, spraying, jetting, washing , Stirring, bonding, and peeling operations, all of which may generate static electricity. In general, the less conductive non-conductor, the more likely it is to be charged because it is not easy to flow after the charge is generated.
The problem of static electricity is particularly serious in clean rooms, because not only the various process factors that generate static electricity are available in the clean room, but also because many materials in the clean room, such as plastic floors, walls, nylon, and real work clothes, are very High resistivity is very easy to generate static electricity and accumulate static electricity. Before static electricity disasters in clean rooms were not taken seriously, these materials were widely used.