SMT production line, also known as surface mount technology (SMT), is a new generation of electronic assembly technology developed from hybrid integrated circuit technology. It is the most popular technology and process in the electronic assembly industry. Since electronic components are sensitive to static electricity, surges, mechanical stress and thermal stress, electrostatic protection in SMT workshops is essential. The core of electrostatic protection in SMT workshops is "eliminating static electricity", that is, keeping static electricity to a minimum to ensure that it will not cause damage and destruction to electronic components. To control static electricity within the applicable scope, it is mainly from the following aspects:
1. Grounding
Grounding refers to places in the factory that may cause charge accumulation, such as equipment, workbenches, etc. The principle of wire grounding is the same as that of lightning rods. As for why it is connected to the earth, it is because the earth is an object with very low resistance and large capacitance. It has the ability to absorb infinite charges and can maintain the potential unchanged after absorbing a large amount of charge.
2. Control the humidity of the patch workshop
Dry and windy autumn and winter are prone to static electricity, while rainy spring and summer are relatively less. In response to this phenomenon, ULiESD studied the humidity of static electricity and concluded that static electricity will decrease when the ambient temperature is relatively high. Therefore, the SMT workshop uses air conditioning and other equipment to control the humidity of the environment. The generation of static electricity can be controlled to a certain extent.
