Printed circuit boards (PCBs) are the substrates for assembling electronic components (mainly composed of insulating substrates and conductors). Their main functions are to connect various electronic components, play the role of conduction and transmission, and they are the key interconnections of electronic products.

As an indispensable carrier of electronic components, its manufacturing quality directly affects the stability and service life of electronic control module, and ultimately affects the overall performance of terminal electronic equipment and products. The development level of printed circuit board industry can reflect the development speed and technology level of national or regional electronic information industry.