What Should Be Paid Attention To in The Production Process Of PCB Multilayer Board?

In the eyes of professionals, PCB multi-layer boards usually refer to circuit boards with more than 10 layers. It has an insurmountable gap with traditional multi-layer boards. It is good for enterprises and product quality. Require. At the same time, it has a very wide range of applications, and there is a deep development potential waiting for us to tap. Today, let's study what needs to be paid attention to in the production process of multilayer board!

1. Pressing

There must be an urgent process for multilayer boards. In this process, if you are not paying attention, phenomena such as delamination and skateboarding will occur. Therefore, the properties of the material must be considered when designing. The more layers, the more difficult it is to control expansion and contraction and to compensate for the dimensional coefficient, and problems will follow. If the insulating layer is too thin, a test failure may occur. Therefore, more attention is paid to the stamping process, there will be more problems at this stage.

2. Inner circuit

The materials used to make multilayer boards are also very different from other boards. For example, the copper skin on the surface of the multilayer board is relatively thick. This increases the difficulty of the inside line layout. If the inner core board is very thin, it is prone to abnormal exposure, which may be caused by wrinkles. Generally speaking, the unit size of the multilayer board is relatively large, and the production cost is high. Once a problem occurs, it will bring huge losses to the enterprise. Income may not be able to maintain a balance of payments.

3. Alignment

The more the number of layers, the higher the requirements for the degree of alignment between the 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 a multilayer board will be very large.

4. Drilling

Since the multilayer board is made of special materials, the difficulty of drilling also increases. This is also a test of drilling technology. Due to the increase in thickness, the drilling tool is easy to break, and a series of problems such as inclined drilling may occur. We should pay more attention!