Tips: Nantong Bao Jian: Analysis of the generation and harm of static electricity

Static electricity generation:

In everyday life, static electricity is very common. In air-dried areas, people often wear static electricity when they undress, use hand-drawn doors, walk on plastic floors or composite carpets, or touch other objects, causing numbness. The relevant experts have done tests and used glass rods to rub 20 times on chemical fiber fabrics and immediately measured with the instrument. The results show that the highest voltage can reach 15kV. There are mainly the following factors that generate static electricity.

1. Material properties

The material properties include the inherent chemical composition of the material, the internal structure of the material, the stress properties, the material shape, and the electrical conductivity. If the material is a conductor, the charge is free to move on its surface, and the distribution of the charge on the entire surface tends to be uniform rather than staying at a local position where the charge is generated. This charge can only produce a lower voltage, any part of the conductive material in contact with the ground can immediately make the charge on the material to the ground. Different insulation materials, such as paper, plastic film and other materials, generate static electricity to form a higher voltage, and can not be eliminated by grounding.

2. surroundings

The surrounding environment includes the gas composition, pressure, temperature, humidity, etc. of the contact material.

3. Mechanical effect

Including the type, time, area and the separation speed of the two materials, the nature of the force. In general, the closer the two materials are in contact or the faster the separation, the greater the static electricity generated. Static electricity is static with respect to the frequently used power. A small current does not form a loop. The characteristic is that there is movement and friction generates static electricity. The potential is sometimes as high as several kilovolts or tens of thousands of volts. It rapidly disappears after discharge and cannot be transported and distributed. .

Electrostatic hazard:

With the wide application of polymer materials, electrostatic problems have become increasingly prominent. Not only sparks due to static electricity have caused sparks and explosions, but also product quality, electronic components, and data loss. The hazards and accidents caused by electrostatic discharge can be roughly divided into three categories: 1 production failures; 2 fires and explosions; and 3 secondary disasters caused by electrostatic shocks in the human body. As various types of disasters and production accidents caused by electrostatic phenomena have been increasing year by year, and there are increasingly serious trends, the harm to statics and prevention have become an issue of increasing concern to everybody. The relevant national standards also clearly stipulate that anti-static overalls must be worn when working in the electronics industry, petrochemicals, aerospace and other fields.