Multi-layer PCBs are used as the "core main force" in the fields of communications, medical treatment, industrial control, security, automobiles, electric power, aviation, military industry, and computer peripherals. Product functions are getting higher and higher, and PCBs are getting more and more......

Via hole is also called via hole. In order to meet customer requirements, the via holes must be plugged in the PCB process. Through practice, it has been found that in the process of plugging, if the traditional aluminum sheet plugging process is changed, and the white mesh is used to complete the b......