Post-Etch-Punch(PEP): This process punches tooling holes which are used to align inner-layer cores in subsequent processes.

• 冲孔：冲孔机冲的孔用于下工序内层定位。冲孔机利用带靶形的摄像系统在铜板上定位，冲出的孔有非常高的精确度。