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The solder mask refers to the part covered by ink on the fpc, that is, the solder mask. The solder mask plays a very important role in controlling the reflow soldering process. Some friends don't know whether the fpc uses the ink or the covering film. Let's talk about it in detail.

The ink used is still covered with film

There are two kinds of resistance welding materials for fpc soft plate: ink and covering film.

The ink used for resistance welding is generally photosensitive, called liquid photosensitive ink. Generally, there are green, black, white, red, yellow, blue, etc. The covering film is generally yellow, black and white. Black has good shading and white has high reflectivity. It can replace white oil black for the FPC soft board of backlight.FPC soft board can be welded with both ink and covering film.

 

The function of fpc resistance welding

1. Surface insulation.

2. Protect the line and prevent line damage.

3. Prevent conductive foreign matters from falling into the circuit and causing short circuit.