Accidents caused by static electricity often occur in purification workshop, so how to prevent static electricity in purification workshop has become an indispensable aspect in evaluating its quality.
The so-called static electricity is due to friction and other reasons, which destroys the uniform neutral state of positive (+) negative < 1) charges in the object, and causes excess charges. The object is charged. Because these charges are usually not flowing, they are called static electricity.
Accidents caused by static electricity in the purification workshop include the following aspects.
1. Electrostatic shock caused by electrostatic electricity can cause people's insecurity and fear, and can cause secondary injury (for example, people fall because of electrostatic shock, and people fall because of injury);
2. The discharge current caused by electrostatic discharge can lead to damage and misoperation such as semiconductor devices. For example, 50 P-MOS circuits are placed in plastic bags. After shaking several times, 39 of them break down seriously with non-gate electrodes. The failure rate is 78%, which is because semiconductor devices are very sensitive to electrostatic discharge.
3. Electromagnetic waves generated by electrostatic discharge can lead to noise and misoperation of electronic instruments and devices.
4. Electrostatic discharge (ESD) can cause photosensitive damage such as photographic limbs.
5. The mechanical phenomena of static electricity can cause the screen hole to be blocked by dust, the yarn to be chaotic, the printing material to be uneven and the product to be polluted.
6. The most dangerous hazard caused by ESD is the explosion caused by flammable fire wells. For example, according to the statistics of foreign literatures, 36 of the 86000 times of using explosive anesthetics in the operating room have been exploded, of which 21 times have been caused by static electricity.
The main causes of electrostatic accidents lie in the generation and accumulation of static electricity. The flow of air, friction between air and pipes, air outlets and filters, friction between human body and clothes, friction between clothes, technological grinding, spraying, jet, washing, stirring, bonding and peeling operations, all of which may produce static electricity. In general, the less conductive the non-conductor (insulator) is, the easier it is to be charged because it is not easy to flow after the charge is generated.
The electrostatic problem is particularly serious in the purification workshop because it not only possesses the aforementioned various technological factors for generating electrostatic in the purification workshop, but also because many materials in the purification workshop, such as plastic floor, wall, nylon, dacron and other work clothes, have very high resistivity and are very easy to generate electrostatic and collect electrostatic. These materials were widely used before the electrostatic disasters in the purification workshop were neglected.