With the continuous popularization of electronic products, the demand for PCB is also increasing. One of the important steps is the blending of solder mask ink. Solder mask ink is a material used for printing and protecting PCB, which has good adhesion, corrosion resistance, and temperature resistance. The mixing of ink should be carried out according to the requirements of the PCB. Calculate the required ink ratio based on the board thickness, design requirements, line width, aperture, and other factors of the PCB. At the same time, considering environmental protection and energy-saving requirements, we should choose ink raw materials reasonably and minimize the use of harmful ingredients. There are some details that need to be paid attention to when mixing ink. The drying speed, hardness, viscosity, etc. Of the ink all need to be adjusted to the optimal state. In order to ensure the stability of the ink, it is also necessary to evenly stir and filter the ink. In order to ensure the quality and stability of ink, it is necessary to use professional ink blending equipment and maintain good operating habits and precautions during the operation process, such as regularly cleaning the equipment and using protective measures, to ensure the production of ink that meets the requirements. The preparation of solder mask ink is a relatively tedious task, but it is also a very important step. Only by grasping every detail and strictly blending according to requirements can we produce high-quality PCB ink that meets the requirements. Solder mask is generally divided into three types: PCB circuit etching ink, solder resistant ink, and text ink. Some are conductive carbon oil and conductive silver oil. Photosensitive etching ink The substrate of PCB is copper clad board, with a layer of copper foil on it. It needs to be screen printed with photosensitive etching ink, and then cured through exposure development to etch off the unexposed areas before deinking. Photosensitive etching ink is mainly used to protect copper foil on PCB that do not require etching, playing a role in resistance to etching, acid and alkali, and electroplating. Solder resistant ink Solder resistant ink is a common ink in PCB. We see something like green paint on the board, which is actually solder resist ink. According to the curing method, solder resist inks include photosensitive developing inks, heat cured thermosetting inks, and UV cured UV inks. The photosensitive solder resist ink uses UV curing, and after screen printing, it needs to be pre baked and exposed for development. The most common type of UV ink is UV green oil, which is commonly used in mass production of automated PCB. It has functions such as insulation, resistance to reflow soldering, resistance to gold plating, gold plating, tin plating, silver plating, and salt spray. It can also protect the copper foil circuit on the PCB and increase its lifespan in future use. Thermosetting ink Thermosetting ink is directly printed and baked. Mainly used as marker characters or patterns.
