With the rapid development of PCB industry, PCB is gradually developing towards the trend of high precision fine lines and small aperture. Generally, PCB manufacturers have the problem of electroplating film clip. PCB film clip will cause a direct short circuit, affecting the primary yield of PCB board through AOI inspection.

Příčiny:

1, the anti-coating layer is too thin, because the coating exceeds the film thickness during electroplating, the FORMATION of PCB clip film, especially the smaller the line spacing is more likely to cause short circuit clip film.

2. Nerovnoměrné rozdělení deskové grafiky. V procesu grafického galvanického pokovování povlak izolovaných čar přesahuje tloušťku fólie kvůli vysokému potenciálu, což má za následek zkrat způsobený upínací fólií.

Řešení:

1, increase the thickness of the anti-coating

Choose the appropriate thickness of dry film, if it is wet film can be printed with low mesh plate, or by printing wet film twice to increase the film thickness.

2. Uneven distribution of plate graphics, appropriate reduction of current density (1.0-1.5A) electroplating

In daily production, we out of reasons to ensure the production, so the control of the electroplating time is generally shorter, the better, so using the current density is between 1.7 ~ 2.4 A commonly, so get of current density on isolated area will be 1.5 ~ 3.0 times that of the normal area, often causing isolated area on the place of small spacing coating over the film thickness is very much, After the film is removed, the film is not clean. In serious cases, the line edge will clamp the anti-coating film, resulting in short circuit of the clip film, and will make the welding thickness on the line thin.