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The importance of anti-static in electronic clean room

Source: Time:2019-06-26 11:15:20 frequency:

In the daily work of the clean room, accidents caused by static electricity occur frequently, so how to prevent the anti-static ability of the clean room has become a non-negligible aspect to evaluate its quality. What is static electricity? It is due to friction and other reasons that the positive (+) negative <1)

In the daily work of the clean room, accidents caused by static electricity occur frequently, so how to prevent the anti-static ability of the clean room has become a non-negligible aspect to evaluate its quality. What is static electricity? It is due to friction and other reasons that the positive (+) negative <1) charge in the object is equal to the uniform electric neutral state, and the charge is excessive, and the object is in a charged state. Since these charges are not flowing at all times. Therefore, 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 photo damage such as photographic limbs;
2. Discharge current caused by electrostatic discharge can cause damage and malfunction such as semiconductor components, for example, placing 50 P-MOS circuits in a plastic bag, shaking several times, and NAND gates are severely breakdownd. Block, the failure rate is up to 78%, because the semiconductor device is very sensitive to electrostatic discharge;
3. Electromagnetic waves generated by electrostatic discharge can cause noise and malfunction of electronic instruments and devices;
4. Electrostatic mechanical phenomena can cause the mesh holes to be blocked by dust, the spinning yarns are disordered, the prints are uneven in depth and product contamination;
5. The most dangerous disaster caused by electrostatic discharge is the explosion of the fire source that becomes a combustible material. For example, in foreign literature statistics, 36 times of explosions in the operating room using 86,000 explosive anesthetics, of which 21 times caused by static electricity ;

The occurrence of electrostatic accidents mainly lies in the generation and accumulation of static electricity, the flow of airflow, the friction of airflow and pipes, tuyères, filters, etc., the friction between the human body and clothes, the friction between clothes, the grinding on the process, the spraying, the jet, the washing Stirring, bonding and peeling operations, etc., all of which may generate static electricity. In general, the smaller the non-conductor with lower conductivity, the easier it is to flow after the charge is generated, so it is easier to charge.

The problem of static electricity is particularly serious in clean rooms, because not only the various process factors for generating static electricity are provided in the clean room, but also because many materials in the clean room, such as plastic floor, wall surface, nylon, and good clothes, are very The high resistivity is extremely prone to static electricity and static electricity. These materials are widely used before the electrostatic disaster in the clean room is ignored.

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