At the same time, physical and chemical changes are formed on the surface of the functional groups of the gas composition, so as to improve the bonding force of copper plating, pollution removal and other plate loading effects.
At present, most automatic exposure systems use a solid-state camera to read the target image of the negative and substrate, and then calculate the difference as the basis for position correction.
the process requirements of PCB circuit boards in each industry have gradually improved. For example, gold and copper are used in the circuit boards of mobile phones and computers.
The following processes of PCB circuit board production need pure water cleaning: copper plating, gold plating, silver plating, nickel plating, tin plating. Can be used for multilayer circuit board, double layer circuit board and single layer circuit boar
which makes the direction of high frequency, high power and miniaturization. High signal power, high current and high voltage put forward higher requirements for PCB surface copper degree and hole copper thickness.
PCBA welding processing, usually PCB board has a lot of requirements, and must meet the requirements of the board to accept welding processing.
the polymer resin containing phosphorus nitrogen compounds will produce non-combustible gas when it is burned. This gas can isolate the surface and air of the resin combustion
printing material dry too fast, in the screen version dry plugging hole, printing speed is too fast, scraper strength is too high. Solution, should use volatile organic solvent slow printing material, with soft cloth stained with organic solvent gently cl
PCB circuit boards play an important role in life today. It is the foundation of electronic components and the highway. In this regard, the quality of the PCB is critical.To check the quality of a PCB, a number of reliability tests must be performed. The
With the reduction of the aperture, the original debris that has no effect on the larger aperture, pcb board factory, such as brush debris, volcanic ash, once remaining in the hole, will make the chemical precipitation of copper, copper plating will lose
If the two reference planes (i.e. the path where the signal returns) have the same potential and the two layers are joined together multiple times through the holes, then the specified return path will have a small loop area. This is the design we wanted.
What is causing concern is the unpredictability of the noise itself. Typically, the noise may come from an external source or an internal source. Even the source of the noise poses more problems.
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