Principle of dissipating static electricity
Production technology, processes and materials have different changes in different periods. In order to achieve the best anti-static effect, all walks of life have tried to find a good way to eliminate static electricity, but the design and implementation of effective static control programs are still based on the following five concept.
1. Design electrostatic protection into components and products
Eliminate static-generating materials and processes to design your components, products, and assemblies to make it more logical to avoid electrostatic discharge (ESD). If possible, use static-insensitive components or provide appropriate input protection for those electrostatic discharge-sensitive (ESDS, ESD-sensitive) components that you use. Paradoxically, advanced production techniques mean more compact and more complex geometries, often more sensitive to ESD. However, the more product design is built
ESD control, the fewer problems that will occur afterwards.
Second, eliminate the static electricity generated materials and processes
Obviously, product design is not a complete answer. You can't evade ESD components and products, but you can reduce or eliminate the generation and accumulation of electrostatic discharges. The first step is to reduce or eliminate as many of the static-generated processes or materials as possible from the working environment, such as ordinary plastics. Because ESD does not occur between materials that maintain the same potential or zero potential, the process or material in the work environment should be maintained at the same electrostatic potential. Typically, these conductive or dissipative materials should be electrically connected to the same common ground, such as an electrical ground. In addition, the ground wire is provided to the surface of the electrostatic wristband, the floor or the table to safely reduce the generation and accumulation of discharge.
Third, disperse or neutralize electrostatic discharge
Because all the generation of static electricity is impossible to completely eliminate, our third principle is to safely disperse or neutralize the electrostatic discharge that will occur. Proper grounding and conductivity or dissipative
The material plays a major role. For example, workers with static electricity entering the work environment can remove static electricity from their body by stepping on the ESD floor mat with an electrostatic wrist strap or an ESD-controlled work shoe.
Ground, not discharge sensitive components. For some objects, such as ordinary plastics and other insulators, grounding does not eliminate electrostatic discharge. Usually, the use of ions to neutralize the placement of these insulating materials
Electricity. The ion action process produces positive and negative ions that are attracted to the surface of the discharge object, thus effectively neutralizing the electrostatic discharge.
Fourth, provide physical protection of electrostatic discharge
Our fourth principle is to prevent electrostatic discharges from coming into contact with sensitive components and assemblies. One approach is to provide proper grounding or shunting of components and assemblies to disperse any discharge from the product.
The second method is to package and transport sensitive components in appropriate packaging materials. These materials effectively shield the product from static electricity and reduce static electricity generated by the movement of any product in the package.
V. Testing the production process and environment
For example, a field strength meter (electrostatic voltage tester) is used to detect the presence of an electrostatic field that is likely to cause an ESD hazard. Measurement is the surest method. You identify and quantify areas that really need static protection, allowing you to focus on those areas that are most concerned. In addition, you can identify areas that do not create an ESD hazard, saving you the cost of unnecessary protection.
These five principles form the basis of an effective static control program. They help to select the right materials and procedures for effective ESD control. In most cases, an effective program will cover all of these concepts. In developing control programs, identify those sensitive components, the level of sensitivity, and the operations that are ESD-hazardous. Then see which concept will protect these components. Finally, select and implement a combination of procedures and materials that can accomplish this task.