PCB News - How does a circuit board factory distinguish between dry film and wet film

How does a circuit board factory distinguish between dry film and wet film

1. When making PCB boards in the circuit board factory, one of the processes needs to use dry film and wet film. In fact, the function of dry film and wet film is basically similar, but if the surface is relatively uneven or does not need to build a thicker height Or for very thin film thickness, circuit board manufacturers can consider using wet film. If it is a circuit board with holes, a dry film will be more suitable. And if the environment is not easy to keep clean, the dry film is also easier to control the quality of the operation. Although the materials of wet film are relatively cheap, they are not available everywhere. In addition to general considerations, it should still be considered in line with the manufacturer's own operating environment requirements.

2. The dry film is easy to operate, but the unit price is slightly higher than that of the wet film. But because it is easy to keep clean, and does not need to be baked, the workability is also better, so it is more advantageous in use. However, it is not easy to achieve a thin film thickness, especially a dry film with a thickness of 15 μm or less. In addition, the better filling capacity of the wet film is its advantage, but because there is no protective film, higher exposure energy is required. Different viewpoints have different pros and cons. This must be compared by the user to get a better fit. The conclusion.

3. At present, the so-called wet film is almost always used in soldering paint. As for the application of the inner layer board, the proportion of the wet film is also getting higher and higher. This is because of the low price and the gradual improvement of technology maturity. For the sake of. But the two are in the production of inner circuit boards.

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