What is the principle of anti-static bag?
With the development of electronic information technology, electronic products in the production and transportation process of the environmental requirements are increasingly high. Among them, the prevention of electrostatic damage has become an important link. As an effective protective material, anti-static bags play an important role in protecting sensitive electronic components from electrostatic damage.
What is static electricity?
Static electricity is the phenomenon of static charge on the surface of an object due to friction, contact separation and other reasons. When two objects made of different materials rub against each other, electrons are transferred from one object to the other, resulting in one being positively charged and the other negatively charged. These accumulated charges, if not released in time, will form a static electric field and may suddenly release energy in the form of a discharge, thus causing damage to the surrounding sensitive electronic equipment.
Hazards of static electricity on electronic products
- Direct breakdown: High-voltage electrostatic discharge can directly breakdown the tiny components on the circuit board.
- Indirect effects: Even without direct damage, static electricity may cause problems such as data loss or program errors.
- Long-term effects: repeated exposure to low-intensity electrostatic shock may lead to shortened product life.
Antistatic bag introduction
Anti-static bag is a kind of bag specially designed for packaging and storing electronic components and finished products. It is made of multi-layer composite material, which can effectively shield the external electromagnetic interference and control the internal relative humidity, in order to achieve the purpose of protecting the internal items from electrostatic damage.
Material Composition
- Outer Layer - Polyethylene (PE) or polypropylene (PP) plastic film is usually used as the base material;
- the middle layer - with the addition of conductive particles such as carbon black or metal powders, which make the whole film electrically conductive;
- inner layer - sometimes an anti-static coating is added to further improve its anti-static properties.
Working Mechanism
- static dissipation: when the middle layer comes into contact with an external static source, it can quickly conduct the excess charge to the ground or other conductors, avoiding static buildup.
- Shielding effect: good conductivity also makes the anti-static bag can effectively shield the external electromagnetic wave interference, reduce signal distortion.
- humidity regulation: some high-level anti-static bags also have moisture absorption and breathable function, which helps to maintain the appropriate relative humidity inside the bag, to further protect the safety of electronic products.
Application
- electronics manufacturing industry
- semiconductor chip packaging and testing
- Precision instrument transportation
- medical device storage