From:sochi
Through hole
The copper foil circuit between the conductive patterns in different layers of the circuit board is conducted or connected by this kind of hole, but the copper plating hole of the component leading leg or other reinforcing materials cannot be inserted. Printed circuit board (PCB) is formed by stacking many copper foil layers. Because each layer of copper foil is covered with an insulating layer, they need to rely on via for signal link.
PCB equipment accessories supplier —— Technology of through hole
1. Only copper is needed in the hole, and the welding resistance can be plugged or not;
2. There must be tin lead in the hole, with a certain thickness requirement (4um), to avoid solder blocking ink entering the hole, resulting in tin beads in the hole;
3. The through-hole must be provided with solder stop ink plug hole, light tight, free of tin ring and bead, and must be flat.
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