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We all know that there are many holes, big or small, in PCB process. How did these holes come into being? Here is related to our PCB circuit board production process —— drilling. Drilling is an essential process in PCB printing by drilling a through hole between the top layer of the circuit and the bottom layer of the solder pad (multilayer board including inner layer) , and then plating a layer of copper on the hole wall, the copper skin passing through the hole wall between the lines of each layer is communicated.