Views:0 Author:Site Editor Publish Time: 2020-10-31 Origin:Site
Electrostatic discharge (ESD) is defined as the discharge (current of electrons) to or from the charge (insufficient or surplus of electrons) that has been electrostatically (fixed). The charge is stable under two conditions: when it is trapped in a conductive but electrically insulating object. If an electrically insulated conductor (screwdriver) with a sufficiently high electric charge is close to an integrated circuit (IC) with an opposite electric potential, the electric charge will cross over and cause electrostatic discharge (ESD). The static charge generated by the object due to friction, peeling, electrostatic induction, etc., after a long time accumulation, the potential difference between the charged objects is so large that it may reach the breakdown field strength to a certain extent, and the instant discharge occurs.
In industrial production, static electricity may be generated with various operations. Such as raw material feeding, mixing, finished product conveying, sub-packing, etc. If static electricity accumulates to a dangerous level, electrostatic discharge will occur, which may cause electric shocks in the lighter case, and may ignite the surrounding flammable materials in the severe case, causing fire or explosion accidents, causing casualties and property losses. For example, there are many different manufacturing processes and operations in a chemical factory. Some of the daily repetitive tasks have never occurred in a hazardous event, but one day a certain component or material was replaced, but the operators did not notice the potential electrostatic hazard in the operation , Resulting in serious hazardous events.
The harm of static electricity is obvious to all. Now more and more manufacturers have begun to implement various levels of anti-static measures and projects. The generation of static electricity is inevitable in industrial production, and the damage it causes can be attributed to the following two mechanisms.
Electrostatic discharge (ESD) causes malfunctions or malfunctions of electronic equipment, causing electromagnetic interference; breakdown of integrated circuits and precision electronic components, or aging of components, reducing production yield; high-voltage electrostatic discharge causes electric shocks, endangering personal safety; The production site of flammable and explosive products or dust and oil mist is very easy to cause explosion and fire.
Electrostatic attraction (ESA) can cause dust absorption in the electronics industry, causing pollution of integrated circuits and semiconductor components, and greatly reducing the yield; in the film and plastic industries, the film or film will be unevenly wound; the film and CD plastic disks will be contaminated with dust. Affect the quality; in the papermaking and printing industry, the paper will be unevenly wound, inaccurate overprinting, serious absorption, and even the paper will stick, which affects production; in the textile industry, it will cause hazards such as fluttering of filaments, broken ends of entangled flowers, and tangled yarns.
Electrostatic hazards in the power electronics industry: product defects and damage caused by static electricity are the main ones, and the electrostatic hazards in the food industry are mainly powder operations and alcohol tank storage and transportation operations; preventive measures against electrostatic hazards in the manufacturing process should be understood first. The principle of hazard occurrence, familiar with the factors of static electricity generation and dissipation in the process of hazard development, as well as the types and hazards of electrostatic discharge, able to identify each stage of the formation of electrostatic hazards, and then use electrostatic measuring instruments for the hazards to carry out the substances and environment in the process Measure, grasp the physical quantities of static electricity in the process, evaluate potential static electricity hazards, follow-up research and take appropriate static electricity hazard prevention and control methods, and continue to measure and compare the effects of electrostatic hazard protection measures, which can effectively reduce potential static electricity Hazards, and improve the safety of operations and personnel in the production process.