Anti-static engineering of electronic products in the production process
Static electricity is an objective natural phenomenon, which can be generated in many ways, such as contact, friction, rushing, etc. The basic process of its generation can be summarized as: contact → charge → transfer → even electric layer formation → charge separation.
The static electricity on the equipment or the human body can be as high as tens of thousands of volts to hundreds of thousands of volts, and it often reaches hundreds to thousands of volts under normal operating conditions. The human body is separated and rubbed due to its own actions and contact with other objects. Or induction and other factors, it can bring thousands of volts or even tens of thousands of volts of static electricity. Static electricity is the result of the loss of balance between positive and negative charges in a local range. It is a kind of electrical energy that remains in the object. It has high potential, low electricity, Features of low current and short action time.
The main measures of static control include: static leakage and dissipation, static neutralization, static shielding and grounding, humidification, etc.
Component breakdown damage caused by electrostatic discharge is the most common and most serious electrostatic hazard in the electronics industry. It is divided into hard breakdown and soft breakdown. Hard breakdown is a one-time cause of component dielectric breakdown, burning or long-term failure; soft Breakdown is caused by the deterioration of the performance of the device or the decline of parameter indicators.
The transfer and storage of electrostatic sensitive components and printed circuit boards during the production process must use anti-static loading boxes, component boxes, turnover boxes, turnover trays, etc. to prevent the hazards caused by static electricity accumulation. As a finished product When packaging, anti-static shielding bags, packaging bags, packaging boxes, baskets, etc. must be used to avoid static electricity damage during transportation.
In the production process of electronic products, its components, components, finished products often contact, separate, and friction with equipment tools, etc., and generate static electricity.Anti-static cushions, turnover carts, maintenance kits, tools, work chairs, etc. must be used, and appropriate The grounding can quickly discharge static electricity.
Friction electrification and human body static electricity are the two major sources of hazards in the electronics and microelectronics industries, but the generation of static electricity is not the hazard. The hazard is the accumulation of static electricity and the resulting electrostatic charge discharge. The charged objects form an electrostatic field around them. It will produce mechanical effects, discharge effects and electrostatic induction effects, so it must be controlled.
Due to the mechanical effect of static electricity, floating dust particles in the air will be adsorbed on silicon chips and other components, which will seriously affect the quality of electronic products. Therefore, anti-static measures must be taken for the clean room. Walls, ceilings and floors of clean rooms, etc. Anti-static materials that do not emit dust should be used, and a series of electrostatic protection measures should be taken for operators, workpieces, and appliances.
In order to understand the static electricity in the production process, determine the degree of static electricity in the production process, and inspect the quality of electrostatic protection products and equipment, it is necessary to measure static electricity and related parameters.
The measurement of static electricity is mainly to measure the static voltage, material resistance, ground resistance, static off-life, static electricity, static elimination performance, and surface density of cloth charge.
Electrostatic protection is a systematic project. Omissions or errors in any link will lead to the failure of electrostatic protection. It must be guarded from time to time, and everyone should guard against it.
The problem of static electricity has always appeared in our lives and work. How to correctly prevent static electricity and use anti-static products is our current concern. Of course, there are many types of anti-static materials and anti-static products, but they can mainly be classified as anti-static products. Static table mats, anti-static tools, etc.: First, the human body must be fundamentally anti-static. The following anti-static products should be used:
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