Pin Lamination Procedure for Stackable Drilling
Original Publication Date: 1985-May-01
Included in the Prior Art Database: 2005-Feb-18
A procedure for drilling sheet copper in a laminated stack is accomplished by placing the copper to be drilled in the middle of a lamination pad and sealing the edges. This procedure eliminates unnecessary handling and prevents wrinkles and scratches. The sheet copper 3 is first punched, introducing the location slots. The copper 3 is then sandwiched between sacrificial copper 4 and prepreg 5 sealing the copper in a stack pad, as illustrated in the side view of the stack in Fig. 1. In order to separate the sheet copper 3 after drilling, it is important to prevent any resin from the prepreg 5 from reaching the location slots 6, as seen in the top view of the stack in Fig. 2.