PCB circuit board manufacturers-solving plug holes is very important

PCB circuit board manufacturers-solving plug holes is very important

With the development of high technology, people need electronic products with high performance, small size and multiple functions, which promotes the development of double-sided circuit board manufacturing to be lighter, thinner, shorter and smaller. With limited space, more functions can be realized, and the wiring density of circuit board drawings has increased. , The aperture is smaller. From 1995 to 2005, the minimum hole diameter of mechanical drilling batch capacity dropped from 0.4mm to 0.2mm or even smaller. The hole diameter of the metallization is getting smaller and smaller. The quality of the metallized holes on which the layer-to-layer interconnection depends is directly related to the reliability of the printed board. With the shrinking of the pore size, the debris that did not affect the larger pore size, such as brush debris and volcanic ash, once left in the small holes, will make the electroless copper and electroplated copper lose their effect, and there will be holes without copper and become holes. Deadly metallized killer.

When a plug hole appears in the small hole in the circuit board, due to the small hole diameter, it is difficult to remove the impurities in the small hole by high-pressure water washing and chemical cleaning before copper sinking, which prevents the exchange of the chemical solution in the hole during the chemical copper sinking process, and makes the chemical The sinking copper loses its effect. When drilling holes, choose suitable drill nozzles and backing plates according to the thickness of the laminate, keep the substrate clean, and do not reuse the backing plates. Effective dust collection (using an independent dust collection control system) is a factor that must be considered to solve the plug hole.