ink. The color is usually white, although other colors are available: yellow, black, blue, red. Screen printing is used to render useful information on the PCB board that can help users during assembly. It is circuite imprimate used to mark component values, part numbers, test points, polarity, etc. Screen printing does not
and inner layers of copper alternating with insulating layers). Among the multi-layer PCBs, the most common are the four-layer ones. The imprimate circuite four-layer board has many more routing options in the internal layers compared to the two-layer board, and often part of the internal layers are used as a ground plane or power plane, to achieve
to the substrate. Chemical etching divides the copper into separate conductive lines called imprimate circuite tracks or circuit paths, pads for connections, metallized holes (vias) for passing connections between layers of copper as solid conductive areas for electromagnetic shielding or other purposes. Each of the conductive layers is designed with