In the real environment, there are many ways to generate static electricity, such as friction, induction, conduction, etc. This article will introduce in detail the specific hazards and prevention scenarios and measures of static electricity.
Ⅰ. Hazards of Static Electricity in Various Industries
1. Semiconductor industry
During the manufacturing, testing, storage, transportation and assembly of semiconductor devices, various instruments, equipment, materials and routine operations can easily cause friction and generate static electricity.
1) Sudden complete failure
Sudden complete failure refers to a phenomenon in which one or more electrical parameters of a component suddenly deteriorate and completely lose its specified function. Sudden complete failure usually manifests itself as open circuit, short circuit, and severe drift of electrical parameters. Specific manifestations in reality include the following:
①Media breakdown
②Metalized aluminum damage and melting
③Hot melting of local areas of silicon wafer
④PN junction damage and thermal damage short circuit
⑤ Diffusion resistance and polycrystalline resistance damage (including contact hole damage)
⑥ESD triggers the "latch-up" effect of the parasitic thyristor inside the CMOS integrated circuit, causing the device to burn out due to high current.
2) Potential failure
Potential failure means that when the electrostatic potential energy of the charged body or the stored electrostatic energy is low, it will cause cumulative slight damage inside the device. As the damage gradually accumulates, the electrical parameters of the device will gradually deteriorate. Potential failures can reduce the device's ability to withstand static electricity and reduce its reliability.
2. Electronic industry
1) Electromagnetic interference
Electrostatic discharge is instantaneously changing electromagnetic radiation, such as corona discharge and spark discharge, which will produce certain electromagnetic radiation. This near-field electromagnetic pulse will cause electromagnetic interference to various electronic equipment and information systems.
2) Machine vision
Electrostatically adsorbed dust can easily contaminate industrial lenses. The accumulation of dust and other impurities will cause blurred lens imaging and lead to detection failure, which may ultimately increase the defective rate.
3) Medical industry
In pharmaceutical workshops, static electricity will absorb fine impurities such as dust, making the purity of drugs unable to meet usable standards, and also having a certain impact on the efficacy of drugs. Secondly, during the production and use of anesthetic gas, static electricity can cause the anesthetic gas to burn or even explode.
4) Printing industry
During the printing process, static electricity will cause toner to be adsorbed on the print head, which will clog the nozzle in the long run, causing problems such as blurred printing edges and unsmooth inkjet.
Ⅱ. Static Electricity Prevention and Control Scenarios
1) In scenarios such as grabbing, adsorption, and transportation, if there are parts that are in direct contact with the product, anti-static treatment is generally required. Such as flat belts, timing belts, rollers/roller strips, suction cups, clamping claws, anti-static brushes and other products.
2) For some parts that are not in direct contact with the product, anti-static treatment is sometimes required. The purpose is to prevent the generation of static electricity from affecting the product itself, and also to prevent static electricity from adsorbing dust and other impurities. Such as drag chains, door parts, shock-absorbing materials, organ covers and other products.
Ⅲ. Static Electricity Prevention and Control Methods
Methods to prevent and control static electricity can be approached from two perspectives. The first is to prevent the generation of static electricity from the source, that is, to dissipate the charge through antistatic agents and other means; the second is to remove static electricity during the process, which can be achieved through ion neutralization. Charge neutralization.
1. Prevent static electricity at the source
Use antistatic materials: During the manufacturing, testing, storage, transportation and assembly processes, choose materials with good antistatic properties to reduce the generation of static electricity.
Apply antistatic agents: Treat work surfaces with antistatic agents to help dissipate charges and reduce the accumulation of static electricity.
2. To remove static electricity during the process
Ion neutralization technology:
By using equipment such as ion blowers or ion air guns, ions are released into the work area to neutralize charges and reduce the impact of static electricity.
Anti-static equipment:
In grabbing, adsorbing, conveying and other scenarios, use anti-static treated parts, such as flat belts, synchronous belts, rollers/roller bars, suction cups, clamping claws, anti-static brushes and other products to reduce the risk of Generation and conduction of static electricity.
3. Industry-specific prevention and control measures
Semiconductor industry:
During the manufacturing process of semiconductor devices, electrostatic protection measures should be taken to avoid sudden complete failure and potential failure, such as using electrostatic adsorption equipment, anti-static work clothes, etc.
Electronics industry:
Shield electronic equipment to reduce electromagnetic interference from electrostatic discharge to electronic equipment.
Medical industry:
In pharmaceutical workshops, anti-static floors, work clothes and other facilities are used to reduce the impact of static electricity on drug quality.
Printing industry:
Use anti-static materials and equipment, such as anti-static nozzles, static eliminators, etc., to ensure stability and quality during the printing process.
Through the comprehensive application of these static electricity prevention and control methods, the harm caused by static electricity can be effectively reduced and the safety and stability of the production environment can be improved.
