PCB is one of the indispensable components of electronic equipment, it appears in almost every kind of electronic equipment, in addition to fixing a variety of large and small parts, the main function

of PCB is to make various parts electrical connection. Because the raw material of PCB board is copper-clad board, there will be copper dumping in the PCB production process, then what are the

reasons for PCB board copper dumping?

1. PCB circuit design is not reasonable, with thick copper foil design too thin line, will also cause excessive line etching and copper.

2. copper foil etching is excessive, the electrolytic copper foil used on the market is generally single-sided galvanized (commonly known as ashing foil) and single-sided plated copper (commonly

known as reddened foil), the common copper is generally more than 70um galvanized copper foil, reddening foil and 18um below the ashing foil basically have not appeared batch copper.

3. Local collision occurs in the PCB process, and the copper wire is separated from the substrate by external mechanical force. This poor performance is poor positioning or orientation, the lost

copper wire will have obvious distortion, or scratches/impact marks in the same direction. Peel off the bad copper wire to see the copper foil surface, you can see that the color of the copper foil

surface is normal, there is no bad side corrosion, and the copper foil peel strength is normal.

4. Under normal circumstances, as long as the hot pressing section of the laminate exceeds 30 minutes, the copper foil and the semi-cured sheet are basically combined completely, so the pressing

generally does not affect the binding force of the copper foil and the substrate in the laminate. However, in the process of laminate stacking and stacking, if PP pollution, or damage to the copper foil

wool surface, it will also lead to insufficient bonding force between the copper foil and the substrate after lamination, resulting in positioning (only for the large plate) or sporadic copper wire falling

off, but the copper foil stripping strength near the test line will not be abnormal.