Learn about static electricity

Static electricity is an objective natural phenomenon, and there are many ways to produce it, such as contact, friction, rushing, etc.

The static electricity on equipment or human body can reach tens of thousands of volts to hundreds of thousands of volts. Under normal operating conditions, it often reaches hundreds to thousands of volts. The human body separates and rubs due to its own motion and contact with other objects. Sensing and other factors, can bring a few kilovolts or even tens of thousands of volts of static electricity. Static electricity is the result of positive and negative charge loss in the local range. It is a kind of electrical energy, remaining in the performance of objects, with high potential, low battery, small Short circuit of current and action time.

The main measures of static control include: leakage and dissipation of static electricity, electrostatic neutralization, electrostatic shielding and grounding, and humidification.

Component breakdown damage 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 cause of component dielectric breakdown, burning or permanent failure; soft Breakdown is caused by device performance degradation or parameter index decline.

Electrostatic sensitive components and printed circuit boards must be used for transmission and storage in the production process. Anti-static loading boxes, component boxes, turnover boxes, turnover trays, etc. must be used to prevent the damage caused by static electricity accumulation. As a finished product Antistatic shielding bags, packaging bags, packaging boxes, baskets, etc. must be used for packaging to avoid electrostatic damage during transportation.

In the production process of electronic products, the components, components, and finished products of the components often come in contact with, separate from, or cause friction due to contact with equipment tools, etc. Static electricity must be used, such as anti-static cushions, turnover carts, maintenance kits, tools, and work chairs. Grounding allows quick discharge of static electricity.

Friction electrification and human body static electricity are two major sources of damage in the electronics and microelectronics industry, but the generation of static electricity is not a source of harm. The danger lies in the accumulation of static electricity and the resulting discharge of electrostatic charges. The charged objects form an electrostatic field around them. Mechanical effects, discharge effects and electrostatic induction effects will occur and must be controlled.

Due to the mechanical effect of static electricity, floating dust particles in the air will be adsorbed to components such as silicon wafers and seriously affect the quality of electronic products. Therefore, antistatic measures must be taken for the purification space. Walls, ceilings, and floors of cleanrooms All anti-static non-dust-producing materials should be used, and a series of static protection measures should also be taken for operators, workpieces, and appliances.

In order to understand the static electrification of the production process, to determine the degree of static electricity in the production process, as well as to test the electrostatic protection products and equipment quality, it is necessary to measure static electricity and related parameters.

The measurement of static electricity is mainly the measurement of electrostatic voltage, material resistance, grounding resistance, static shut-off period, static electricity, static elimination capacity, and fabric charge surface density.

A systematic project of the electrostatic protection work product, any omission or mistake in any link, will lead to the failure of the work of electrostatic protection, and must be guarded from time to time.