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Thick Copper PCB

1. Thick copper pcb is divided into single-layer thick copper plate, double-sided thick copper plate and multilayer thick copper plate. The minimum hole diameter of mechanical drilling during production is from 0.4mm
Down to 0.2mm or even smaller, so the metallized hole diameter is getting smaller and smaller. Metallization on which board layers and interlayer interconnects depend
Holes are directly related to the reliability of the thick copper PCB. Today I will share with you the precautions for the production process of thick copper PCB.
2. First, the plugging of debris in thick copper plates
In the long-term production control process, we found that when the hole diameter reached 0.15-0.3mm, the proportion of plug holes increased by 30% 1.
The problem of plugging in the forming process: When processing printed boards, most of the small holes of 0.15-0.3mm still use the mechanical drilling process.
In the long-term inspection, we found that when drilling, the remaining impurities in the holes are the main reasons for plugging: when small holes appear
At this time, due to the small pore size, high-pressure water washing and chemical cleaning before the copper deposition are difficult to remove the impurities in the small holes, blocking the chemical copper deposition
The exchange of traditional Chinese medicine water in the pores makes the chemical copper ineffective. When drilling, select the appropriate drill bit and pad according to the thickness of the stack to keep the base
The board is clean, and the pad is not reused. The effective vacuuming effect (using an independent vacuum control system) is a factor that must be considered to solve the plugging hole.