1. Copper foil adhesion refers to the adhesion force of printed conductor and welding plate on the substrate. The adhesion force is small, so printed conductor and welding plate are easy to be peeled off from the substrate. Circuit board factory check the copper foil adhesive tape, available to test for a transparent tape to the conductor, remove air bubbles, and then with the printed circuit board is 90 ° direction quickly pull off the adhesive tape, if the wire is in good condition, illustrates that the printed circuit board copper foil adhesion unqualified.
Circuit board factory in the production of FPC flexible circuit board products, often need to use the correct method for quality testing, so as to ensure the quality of circuit board, so how do we correctly test? Every piece of FPC circuit board product produced by caper technology has to go through strict quality inspection. Today, caper xiaoxiao summarizes the matters needing attention in FPC soft board quality inspection.
2. The circuit board factory quality inspection content including surface finish, whether the printing is clear and bonding pad roundness and whether welding hollow in the center of the pad, photographic reproduction method is used to make the film covering the already processed on the printed circuit board, the determination of the edge of the printed circuit board size, width and shape of the wire is in the range of requirements.
3. Weldability of solder plate is an important index of printed circuit board. The wetting ability of solder to printed solder plate is mainly measured, which can be divided into three indexes: wetting, semi-wetting and non-wetting.
4. Electrical performance inspection mainly includes insulation and connectivity of FPC soft board, which can be measured by optical board tester. Insulation test is mainly used to measure insulation resistance. The circuit board factory can choose two or more closely spaced conductors to measure insulation resistance first, then humidify and heat it for a certain time and then measure it again at room temperature.