First of all, from the perspective of the mechanism of static electricity generation, we should start by reducing the insulation of the related objects so that the two objects will not generate and generate static electricity even if they rub.
1. Keep the environment at a certain humidity. Practice has proved that, in the northern region or in dry winter, the cases of failure due to static electricity are much larger than in the southeast coastal areas or other seasons, so in some important places, such as computer room, laboratory, and equipment installation workshops should be considered The problem of maintaining a certain humidity, especially for closed air-conditioned rooms, there should be certain humidity control equipment.
2. Lay antistatic floor or carpet. At present, such plastic floor or carpet products with certain conductivity can effectively suppress static electricity generated by people walking.
3. Use ion wind gun, ion head, ion rod and other facilities to prevent static electricity in a certain range.
4. Semiconductor devices should be placed in antistatic plastic containers or antistatic plastic bags. Such antistatic containers have good electrical conductivity and can effectively prevent the generation of static electricity. Of course, the condition should be placed in a metal container or packed with metal foil.
5. Operators should wear anti-static hand straps on their wrists. Such straps should have good grounding performance. This measure is the most effective.
小 Anti-static tips
Static electricity is an objective natural phenomenon and can be generated in many ways, such as contact, friction, and rush current. The basic process can be summarized as: contact → charge → transfer → formation of an electrical layer → charge separation.
The static electricity on the equipment or human body can reach tens of thousands of volts to hundreds of thousands of volts, and often reaches hundreds to thousands of volts under normal operating conditions. The human body can carry static electricity of several thousand volts or even tens of thousands of volts due to its own actions and contact-separation, friction or induction with other objects. Static electricity is the result of the unbalance of positive and negative charges in a local range. It is a kind of electric energy, which remains in the performance of objects, and has the characteristics of high potential, low power, small current and short action time.
The main measures for static control are: leakage and dissipation of static electricity, neutralization of static electricity, electrostatic shielding and grounding, humidification, etc.
The breakdown damage of components caused by electrostatic discharge is the most common and serious electrostatic hazard in the electronics industry. It is divided into hard breakdown and soft breakdown. Hard breakdown is a one-time breakdown, burnout, or permanent failure of component media; soft breakdown is a degradation of device performance or a decrease in parameter specifications.
The transfer and storage of electrostatic sensitive components and printed circuit boards between processes in the production process must use antistatic loading boxes, component boxes, turnover boxes, turnover trays, etc. To prevent damage caused by static electricity accumulation.
Electrostatic sensitive components and printed circuit boards must be packaged as finished products with antistatic shielding bags, packaging bags, boxes, bars, baskets, etc. to avoid electrostatic damage during transportation.
During the production process of electronic products, the components and finished products often come into contact with and separate from equipment and tools. Friction generates static electricity. Antistatic cushions, revolving trolleys, repair kits, tools, work chairs (stools), etc. must be used. With proper grounding, the static electricity is quickly discharged.
Friction charging and human body static electricity are two major sources of hazards in the electronics and microelectronics industries, but the generation of static electricity is not the hazard. The hazard lies in the accumulation of static electricity and the resulting discharge of electrostatic charges, so it must be controlled.
An object with static electricity forms an electrostatic field around it, which produces mechanical effects, discharge effects, and electrostatic induction effects.
Due to the mechanical effect of static electricity, the floating dust particles in the air will be adsorbed on electronic components such as silicon wafers, which will seriously affect the quality of electronic products. Therefore, antistatic measures must be taken to purify the working space.
The walls, ceiling and floor of the clean room should be made of anti-static dust-free materials, and a series of electrostatic protection measures should also be taken for operators, workpieces and appliances.
In order to understand the static electricity generation in the production process, to determine the impact of static electricity in the production process and to inspect the quality of electrostatic protective equipment and equipment, static electricity and related parameters need to be measured.
The measurement of static electricity is mainly the measurement of static voltage, material resistance, ground resistance, static off-life, static electricity, static elimination performance of static eliminator, surface density of cloth charge, etc.
Static protection work is a systematic project. Omissions or mistakes in any link will lead to the failure of static protection work. You must take precautions at all times.