Multilayer circuit board manufacturers: the difference between dry film and wet film

Multilayer circuit board manufacturers: the difference between dry film and wet film

　　There are two ways for multi-layer circuit board manufacturers to make circuits, one is to use dry film, the other is to use wet film, so what is the difference between the two?

　　The dry film and wet film in the multi-layer circuit board manufacturer refer to the raw materials used to make the circuit. The dry film is a kind of polymer compound, which can produce a polymerization reaction after being irradiated by ultraviolet rays to form a The stable substance adheres to the surface of the circuit board , thereby achieving the function of blocking electroplating and etching. Wet film is a kind of photosensitive ink, which refers to an ink that is sensitive to violet lines and can be cured by ultraviolet rays.

Multilayer circuit board

　　1. The functions of dry film and wet film are basically similar, but if the surface is relatively uneven or there is no need to establish a thicker height or a very thin film thickness, multi-layer circuit board manufacturers can consider using wet film. If it is a circuit board with holes, 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 material of wet film is relatively cheap, it is not available everywhere. In addition to general considerations in use, it should still be considered in line with the operating environment needs of the circuit board manufacturer.

　　2. The dry film is easy to operate, but the unit price is slightly higher than that of the wet film. However, since it is easy to keep clean, and the workability is also good without baking, it is advantageous in use. However, it is not easy to achieve a thin film thickness, especially a dry film with a thickness of less than 15 μm. In addition, the better filling ability of the wet film is its advantage, but because there is no protective film, it requires higher exposure energy, and different viewpoints have different pros and cons, which must be compared by the users themselves, in order to obtain a more suitable one for themselves. conclusion.

　　3. At present, the so-called wet film is almost always used in the application of solder paint. As for the application of the inner circuit board, the proportion of wet film is also increasing. This is because of the low cost and the gradual maturity of technology. for the sake of improvement. But both are in terms of inner-layer circuit board fabrication.