Anti-static knowledge
1. Introduction of anti-static knowledge (ESD knowledge):
ESD means electrostatic discharge. It is the abbreviation of Electro-Static discharge in English. From an atomic point of view, plastics, paper, and other materials are usually neutral. The positively charged nucleus of each atom neutralizes with the negatively charged electron cloud around it. When the two materials are separated by pressure or friction contact, electrons will dissociate from the surface of the material, creating an electrostatic zone. The surface of the material with reduced electrons is positive, while the surface of the material with excess electrons is negative. These two charged materials will attract the surrounding oppositely charged materials to neutralize the electricity. If the charged material is conductive, static electricity The charge will quickly be transferred to the ground through the material. If the material is charged during printing, the static charge will be transferred to the surface of the machine. If the material is an insulator, the static charge will gradually leak out after a few hours, weeks, or even months
2. The generation of static electricity:
Static electricity is an objective natural phenomenon, produced in many ways, such as contact and friction. Static electricity is characterized by high voltage, low power, low current and short action time. Static electricity is a static charged charge. Most of static electricity is caused by friction and separation. The friction causes heat to activate the molecules in the material. Then the two substances are separated, and the electrons are transferred from one substance to the other. Matter may happen.
When electrons are transferred, lack or too many electrons can create an electric field, which is what we know as static electricity. The amount of electrostatic field generated depends on the friction or separation of the substance, the amount of friction or separation, and the relative humidity of the surrounding environment.
A substance that easily transfers electrons (or charges) between atoms is called a conductor. Those substances that cannot transfer electrons (or charges) are called insulators. Both conductors and insulators may be charged under the action of static electricity.
Human body's own actions or contact, separation, friction or induction with other objects can generate thousands of volts or even tens of thousands of volts of static electricity.
Static electricity causes serious harm in many areas. Friction electrification and human body static electricity are two major hazards in the electronics industry.
The main measures of electrostatic protection in the production process are electrostatic leakage, dissipation, neutralization, humidification, shielding and grounding.
The human body static electricity protection system mainly consists of anti-static wrist straps, ankle straps, work clothes, footwear, caps, gloves or finger cots, etc. It has the functions of static electricity leakage, neutralization and shielding.
Electrostatic protection is a long-term systematic project. Any mistakes or omissions in any link will cause the failure of electrostatic protection.