Binding several boards together so called Multi-layer and the drawing show here is an example of binding a single sided and a double sided FPC together.
Single Sided + Single Sided
Single Sided + Double Sided
Double Sided + Double Sided
Multi-Layer Process
Multi-Layer Process
1.Film Cutting
2.NC Drilling
3.Black Hole
4.Plating Thought Hole
5.Dry Film Lamination
6.Exposure
7.Development
8.Pattern Etch
9.Film Stripping
10.Pre-Lamination
11.Hot Press Lamination
12.PSR Screen
13.PSR Exposure
14.PSR Development
15.PSR Roast
16.Surface Treatment
17.1st Piercing Punch
18.O/S Testing
19.2nd Piercing Punch
20.FPCA middle QC
21.SMT
22.F/T
23.Final Testing