Conventional process requirements for static electricity
Anti-static work precautions
First, the generation and harm of static electricity: When the surfaces of two objects are in contact with each other, electrons will move back and forth between objects due to friction and motion. As a result of the movement, one surface will be positively charged and the other object will be negatively charged. When separated, the two objects are each loaded with an equal amount of different charges, which is called static electricity. The size of the static electricity depends on the material type, separation speed and surface resistance. In daily life, people's hands and feet can generate static electricity of 100~1500V or more, but it is difficult for ordinary people to detect the existence of static electricity. When the static electricity carried by the human body is in direct contact with computer components, circuit boards and electronic components without any protection, damage to sensitive electronic components and circuits may occur due to discharge, which makes the electronic products have many hidden and difficult to judge. Quality issues.
Second, the purpose of anti-static: in order to avoid static electricity generated by various reasons in the production process, resulting in damage to sensitive electronic components and circuits, improve the quality of electronic products.
Third, the scope of application: used in electronics, medicine, bioengineering, optics, aerospace, aviation night crystal display, computer communications, food hygiene and other high-tech clean areas.
Fourth, anti-static methods and principles:
1. Wear an anti-static bracelet; the anti-static bracelet is divided into two types, one is a corded bracelet, and the other is a cordless bracelet. The working principle of the rope bracelet is relatively simple. That is, the corded wristband is worn on the hand, and the other end is grounded or connected to the grounding wire. The static electricity generated by the human body is directly discharged to the ground through the wristband, and the static electricity effect is better, but it is not convenient. The working principle of the cordless bracelet is to directly contact the metal piece under the bracelet with the human body, so that the static electricity carried by the human body is transmitted to the built-in 1 kohm resistor through the metal piece to be consumed.
2, wear anti-static gloves; anti-static gloves are used to block all external factors that may cause static electricity.
3, placed anti-static table mat; anti-static table mat is generally made of anti-static melamine high-pressure decorative laminate for the surface material and wood material composite. The wood material is generally a particle board, which is embedded in the conductor and grounded through the grounding wire, so that the desktop static electricity is smoothly discharged to the earth through the grounding wire.
4, anti-static turnover box; anti-static turnover box can block the circuit board, electronic components in the production process of the process of generating static electricity. 5, anti-static packaging; anti-static packaging bags can block the circuit board, electronic components in the production, customer service maintenance process to generate static electricity to protect the quality of circuit boards, components.
Five, anti-static job requirements: wear anti-static hats, wear anti-static clothing, wear anti-static gloves, wear anti-static shoes. Wear an anti-static wrist strap.