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According to the number of layers, there are three types of single-sided, double-sided, and multi-layer circuit boards, which are distinguished according to the circuit layers inside.

At present, there are two general FPC welding processes, one is tin press welding, and the other is manual drag welding.

Methods to judge the quality of FPC circuit board: 1： Distinguish the quality of the circuit board from the appearance Generally, the appearance of FPC circuit board can be analyzed and judged from three aspects

The environment in an industrial workshop is different from that of ordinary places, especially in production and processing workshops. Summer temperatures are already high, and combined with the heat dissipation from the machines, temperatures in the workshop often reach over 60°C, and in some cases even reach 80°C. The HDI PCB in industrial control equipment are the "brains" of the equipment. If they are not heat-resistant enough, problems can easily arise. These include circuit aging, component loss, and even direct short circuits. If the equipment stops, the entire production line will be affected.

There are three methods of resist coating: liquid resist coating method and FPC resist coating method for circuit board

We usually refer to metals with good conductivity such as gold, silver, copper, iron, tin and aluminum as conductors. At the same time, materials with poor conductivity, such as coal, artificial crystals, amber, ceramics, etc., are called insulators. Then, we can simply call the material between the conductor and the insulator semiconductor.