Electrostatic protection in the electronics manufacturing industry
Electrostatic protection
In the design of electronic products, the issue of electrostatic protection should be fully considered, so that the electronic product itself has strong anti-static ability. Every person engaged in the electronic assembly industry, such as product processing, assembly, testing, transportation, storage, packaging, debugging, repair and maintenance, etc., should be popularized education and training on electrostatic protection knowledge to enhance their electrostatic protection Awareness, so that you can avoid the damage of ubiquitous static electricity to electronic products.
In modern electronic assembly and production, it is generally impossible not to generate static electricity, but generating static electricity is not the hazard. The real danger lies in the accumulation of static electricity and the resulting electrostatic discharge, due to the control and prevention of static electricity accumulation. Electrostatic discharge is particularly important. The basic concept of anti-static is to prevent the accumulation of static charge or how to leak it quickly and reliably where there is static charge, and keep it below a certain safe voltage.
Conductor protection against static electricity
For conductor parts that may or have generated static electricity, such as production lines, equipment and instrument shells, shielding covers, etc., passages should be provided to discharge static electricity in time, which is commonly referred to as grounding. Reliable grounding provides a good discharge channel for static electricity, so that the static charge accumulated on the charged body can be smoothly discharged, and it is quickly led to the ground, avoiding the discharge of sensitive components. In the anti-static system, separate anti-static grounding wires are established to realize the strict separation of the anti-static grounding wire and the power grounding wire. Conductors that need electrostatic protection, such as the equipment casing, can be directly connected to the anti-static grounding wire.
Non-conductor electrostatic protection
For the static electricity on the insulator, since the charge cannot flow on the insulator, the grounding method cannot be used to eliminate the static electricity, and the method of charge neutralization can be used. For example, the QP-S3 advanced intelligent ion wind rod, static eliminator, ion fan, ion wind rod can generate positive and negative ions, neutralize the static electricity of the static power source, and can be used in places where static electricity cannot be discharged through grounding, such as high-speed Near the placement machine head, there is usually a good anti-static effect. Use static eliminator, static eliminator is a variety of surface active agents, by scrubbing, you can remove the static electricity on the surface of some insulating objects, such as the surface of instruments.
Humidity and temperature both have an impact on ESD. In the same atmospheric environment, areas with lower temperatures will have greater relative humidity than areas with higher temperatures, and an increase in humidity will increase the surface conductivity of non-conducting materials and the air conductivity. Enhancement, the electrostatic charge accumulated on the surface of the insulating object can leak faster. It can be seen that the lower the ambient temperature and the greater the humidity, the more beneficial the protection of static electricity. In places where there is a risk of static electricity, when the process conditions permit, the method of increasing the humidity and lowering the temperature can reduce the possibility of static electricity. This method has obvious effect and low price.
Electrostatic shielding is adopted. Electrostatic shielding is a shielding measure for equipment, parts and instruments that are prone to dissipate static electricity. The shielding cover can isolate the static electricity from the outside and effectively ground the shielding cover.
Electrostatic protection is a long-term systematic project. Any mistakes or omissions in any link will cause the failure of electrostatic protection. Adhere to prevention and eliminate the generation and accumulation of static electricity. Measures should be taken to control the process control, material selection, equipment installation, and operation management. Of course, raise the awareness of static electricity protection. Mastering the electrostatic protection measures is the basic of every person engaged in the production of electronic products. Require.