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FPC flex board is mainly used for the connection of electronic products. It exists as a medium for signal transmission and has high reliability and excellent flexibility. With the popularity of mobile electronic products such as smart phones, wearable devices, and automotive electronics, the demand for FPC has increased, and the entire FPC industry chain will accelerate its growth driven by the demand for consumer electronics.
flex board
What is FPC flex board solder mask ink?
PCB solder mask, also known as PCB solder mask, is also called PCB solder mask film in flexible circuit boards. It is sprayed on the surface of PCB circuit boards with green, yellow, red, black, blue and other photosensitive inks.
FPC is a flexible circuit board, and FPC flex board ink is an ink with anti-bending properties. The FPC solder mask is produced with a cover film, i.e. a dry film. However, some FPC flex boards are now produced with a mixture of photosensitive ink and cover film, so this type of FPC flex board ink is also called a wet film.
Most circuit board solder mask inks are green inks, so they are called green oil bridges, also known as solder mask bridges and solder mask dams. Solder mask ink is a kind of isolation tape used to prevent short circuit of SMD component pins in batch SMD production of PCB factory. In order to control the green oil bridge of FPC flex board, it is necessary to control it during the solder mask process.
What is the role of FPC flex board solder mask ink?
1. Use FPC solder mask ink instead of the original cover film, and its function is the same as the cover film.
2. FPC flex board ink is printed on the copper foil circuit on the surface of the circuit board, isolating the copper foil from the outside world and playing the role of surface insulation.
3. After the circuit board is produced, it needs to go through multiple processes. In order to prevent the copper foil circuit from being damaged during transportation and production, a protective layer should also be printed to protect the circuit and prevent circuit scratches.
4. After the circuit board solder mask ink is completely cured, it can well prevent conductive foreign matter from falling into the circuit and causing a short circuit.
5. FPC flex board solder mask ink has the functions of anti-electroplating, chemical tin resistance and chemical gold resistance, and can also play a good solder mask role in SMT.
6. FPC flex board solder mask ink is a layer of protective paint, which plays a protective role to a large extent.
The ink used for solder mask is usually photosensitive, called liquid photosensitive ink. There are also many solder mask inks that are heat-cured and baked, such as solder mask inks for mobile phone antenna FPC flex boards and character inks printed on circuit boards. There are also some UV-curable inks, mainly green inks.
The inks currently used in circuit boards are generally green, black, white, red, yellow, blue, etc. Cover film, generally yellow, black and white. Compared with lamination, the color of ink can be more diverse to meet the color requirements of various circuit board manufacturers. Black has good lightness and darkness, white has high reflectivity, and white ink is more common in LED backlight soft boards.
What is the difference between covering ink and solder mask ink?
The functions of FPC lamination and FPC flex board ink are the same, mainly because there will be some small differences in the production process. Now some precision circuit board production will still use lamination, but the cost of screen printing ink will be much lower than that of lamination, so most FPC flex board manufacturers will choose to use ink instead of lamination. Over the years, with the development and improvement of inks, many inks have fully possessed the same precision, bending resistance and bending resistance as lamination.