![]() Because these layers are relatively difficult to process, most of them are used to set the power wiring layers with simpler wiring (such as Ground Dever and Power Dever in software), and usually use large area filling methods to route (such as ExternaI Plane and Fill in software). PCB not only has upper and lower sides for routing, but also has interlayer copper foil that can be specially processed in the middle of the board. Protel's "layers" are not virtual, but the actual copper foil layers of the PCB material itself. The important processes of printing PCB: Printing the Copper for the Interior Layers - Getting Rid of the Unneeded Copper - Inspection and Layer Alignment - Laminating the PCB Layers - Drilling - PCB Plating - Imaging and Plating the Outer Layer - The Last Etching - Applying the Solder Mask - Finishing PCB and Silkscreening - Electrical Reliability Testing - Cutting and Profiling. PCB is divided into single-sided, double-sided and multilayer boards. ![]() In order to better understand and use Protel software, and to design a suitable printed board drawing, the designer needs first understand the process flow of the printed circuit board. ![]()
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