PCB Tech - The research on the mechanism of hole plugging in PCB printed circuit board and the introduction of the most effective control method

The research on the mechanism of hole plugging in PCB printed circuit board and the introduction of the most effective control method

Many people want to understand the answers to some questions about the mechanism of PCB hole plugging and how to control them, so this article brings you this knowledge.

1. The reason for the question
With the continuous improvement of the manufacturing precision of PCB manufacturers, the vias made by PCB printed circuit boardmanufacturers are getting smaller and smaller. Regarding mechanically drilled mass-produced boards, 0.3mm diameter vias are the norm, and 0.25mm and even 0.15mm are also emerging in endlessly. Along with the reduction of the pore size comes the lingering via plugs. After the small holes are plugged, the boards are often broken but not broken after the holes are electroplated, and the base cannot be measured by the electrical test. Finally, it flows into the client. After high temperature welding, thermal shock and even assembly, the use of Zhongcai Dongfeng incident occurred. It is too late to reflect carefully at this moment!

If we can start from the manufacturing process and control the processes that can produce plugs one by one to prevent the occurrence of defective plugs, it will be the best way to improve quality. I tried to discuss the mechanism of some hole plugs from the process, and gave some useful manipulation techniques to prevent or reduce the occurrence of bad hole plugs.

2. Analysis of bad hole plugs in each process
As we all know, the processes related to hole disposal in PCB printed circuit board manufacturing by PCB manufacturers include drilling, de-glueing, copper sinking, whole-board plating, pattern handling, and pattern plating. Therefore, it is determined that hole plugs are also the same. We will introduce each process one by one before me.

Although someone grumbled for drilling. But practically speaking, drilling is still one of the primary processes of hole plugging. According to a statistical analysis done by the author, it is found that 35% of the holes without copper actually come from the hole plugging caused by drilling. Therefore, the control of drilling is the main point of poor control of hole plugs. In my opinion, the following aspects are the primary control points:

According to the experimental results, rather than the traditional experience of a master with apprentices to recognize reasonable drilling parameters (as follows, if the knife is too fast, the hole plug is simple);

Regularly adjust the drilling rig;

Ensure dust collection effect;

Be aware that it is the drill that drilled on the tape to bring the glue into the hole, not the tape itself. Therefore, the drill should not be drilled onto the tape at any time;

Develop useful inspection methods for broken drills;

Many manufacturers conduct a high-pressure air dust collector blow hole dust removal treatment after drilling, which can be implemented;

The deburring process before copper sinking should have ultrasonic washing and high-pressure washing (pressure above 50KG/CM2).

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