The Necessity Of Testing The Electrostatic Properties Of Materials
The necessity of testing the electrostatic properties of materials
With the progress of electrostatic precautions, many new anti-static devices (ion fan, ion wind gun, ion wind nozzle, ion wind snake, ion wind bar) and antistatic materials (antistatic floor, antistatic overalls, antistatic Shoes, electrostatic shielding materials) have appeared one after another. How to measure and evaluate the electrostatic properties of these materials is undoubtedly of great significance in the formulation of anti-static feasibility measures and the environmental design of the plant and tooling. Of course, due to the variety and variety of materials, we only take a few of them and make some general introductions.
We know that the evaluation of the electrostatic properties of materials can be roughly attributed to the two aspects of the amount of electricity generated and the speed of charge leakage. The difference in the charge generation process determines the difference in the way it is attenuated. Usually in the process of prevention, the note involves the frictional charging process, which is related to the deeper energy level trap inside the material; however, the reproducibility of the frictional charge mitigation process is poor, so it has to adopt a reproducible corona charging the way. In addition, when judging these measured values, it is necessary to ascertain what kind of pre-treatment the sample has undergone, whether the use in the field is in a coordinated state with the above characteristic experiment, and the like.
It is worth noting that the charged parts of the material are not static. In other words, the results of laboratory measurements are not always consistent with what happens on site. Under actual environmental conditions, how the behavior of static electricity will occur and proceed must be judged and considered according to the site conditions. This is also essential when investigating the electrostatic properties of materials.
Among the materials used in the electronics industry, it is important to evaluate their resistance characteristics. At present, in the electrostatic measurement, the method used is similar to the method of measuring resistance generally. However, since the current flowing through the sample is small, it is necessary to select the measuring electrode for different purposes.
When measured, current will flow through the internal counter surface of the sample. Therefore, the generally measured results are divided into surface resistance and bulk resistance. The so-called body resistance is the voltage applied by the two electrodes divided by the current value flowing through the inside of the sample. The surface resistance should be the voltage divided by the current flowing through the surface of the sample. The methods of measurement are voltage-current meter method; comparison method, bridge method, and the like.