PCB Technical - PCB multi-layer circuit board solves your problems

PCB multi-layer circuit board solves your problems

Generally speaking, a circuit board with more than 4 layers is called a PCB multi-layer circuit board, which is very different from the traditional PCB multi-layer circuit board. For example, the processing and production are more difficult, and the product stability is higher. Because of its wide range of applications, it has huge development potential. At present, most domestic manufacturers of multilayer circuit boards are Sino-foreign joint ventures, or even directly foreign companies. PCB multi-layer circuit boards have relatively high requirements on the technological level, and the initial investment is large. It not only requires advanced equipment, but also a test of the technical level of the staff. In addition, the user authentication procedures are cumbersome, so that many circuit board manufacturers do not have the ability to produce multi-layer circuit boards, so multi-layer circuit boards are still very good. Considerable market prospects.

The following are the points that I think should be paid attention to in the production process of PCB circuit boards:

1. Alignment

The more layers of the circuit board, the higher the level of alignment requirements between layers. Generally speaking, the alignment tolerance between layers is controlled within ±75μm. Due to the influence of factors such as size and temperature, the degree of difficulty in controlling the alignment between layers of the PCB circuit board will be very large.

2. Inner circuit

The materials used to make PCB circuit boards are also very different from other boards. For example, the surface copper of the PCB multilayer board is thicker. This increases the difficulty of the layout of the inner line. If the inner core plate is relatively thin, it is prone to abnormal exposure, which may be due to wrinkles. Generally speaking, the unit size of the PCB circuit board is relatively large, and the production cost is high. Once there is a problem, it will be a huge loss for the enterprise. It is very likely that there will be a situation of making ends meet.

3. Pressing

It is called PCB multi-layer circuit board, and there will definitely be a pressing process. In this process, delamination, skateboarding, etc. will occur if you are not paying attention. So we have to consider the properties of materials when designing. The greater the number of layers, the amount of expansion and contraction and the compensation of the size factor will be difficult to control, and problems will follow. If the insulating layer is too thin, the test may fail. Therefore, pay more attention to the pressing process, as there will be more problems at this stage.

4. Drilling

Because special materials are used to make PCB multilayer circuit boards, the difficulty of drilling has increased a lot. It will also be a test for drilling technology. Because the thickness is increased, drilling is easy to break, and a series of problems such as inclined drilling may occur. Please pay more attention to it!

The above are some of the difficulties in the production process that I think. If there are omissions, I hope you can criticize and correct! Welcome everyone to leave a message in the comment area.