PCB Tech - What are the PCB manufacturing process and dry film

Multilayer PCB manufacturing process

Multilayer PCB manufacturing brief: In essence, the manufacturing process followed by copper multilayer PCB manufacturers is very simple. The manufacturing process should be carried out in the following way:

Choose the material of the inner core, prepreg and copper foil.

The prepreg is made of glass cloth and epoxy resin.

The core laminate is further covered with copper foil (Cu) of specific weight and thickness.

These laminates are then covered with a photosensitive dry film, and ultraviolet rays are brought into contact with the resist. By using ultraviolet light, the electronic data of the internal circuit is transmitted to the photoresist.

The multi-layer PCB circuit board occupies a very high position in the industry, and the functions and effects it can bring are also huge. I hope that the multi-layer PCB manufacturing process introduced today can help you!

PCB dry film

What are the PCB dry films?

1. Single-sided PCB

The substrate is mainly composed of paper phenol copper sheet laminate (paper phenol as the bottom, copper clad) and paper epoxy copper sheet laminate. Most of them are used in radios, audio-visual equipment, heaters, refrigerators, washing machines and other household appliances, as well as business machines such as printers, vending machines, circuit machines and electronic components. The advantage is low price.

2. Double-sided PCB

The substrate materials are mainly Glass-Epoxy copper laminates, GlassComposite copper laminates, and paper Epoxy copper laminates. Most of them are used in personal computers, electronic musical instruments, multi-function phones, automotive electronic machinery, electronic peripherals, electronic toys, etc. As for Glass benzene resin copper laminates, Glass polymer copper laminates are mainly used in communication machinery, satellite broadcasters and mobile communication machines due to their excellent high-frequency characteristics. Of course, the cost is also high.

3. Layer 3-4 PCB

The base material is mainly Glass-Epoxy or benzene resin. Mainly used in personal computers, medical electronic equipment, measuring machines, semiconductor testing machines, CNC machine tools, electronic switches, communication machines, storage circuit boards, IC cards, etc. There are also glass composite copper plates as multilayer PCB materials, mainly focusing on its excellent processing characteristics.

4. 6-8 layer PCB

The substrate material is still based on Glass-Epoxy or Glass benzene resin. Used in electronic switches, semiconductor testing machines, medium-sized personal computers EWS (Engineering Work Station), NC and other machines.

What are the PCB dry film

5. PCB with more than 10 layers

The substrate is mainly made of Glass benzene resin material, or Glass-Epoxy is used as the substrate material of the multilayer PCB. The application of this kind of PCB is relatively special, mainly because it has excellent high-frequency characteristics and high-temperature characteristics, most of which are mainframes, high-speed computers, communication machines, etc.

6. Other PCB substrate materials

Other PCB substrate materials include aluminum substrates, iron substrates and so on. Circuits are formed on substrates, most of which are used in rotating machinery (small motors) and automobiles. In addition, there is a flexible printed circuit board (PCB). The circuit is made of polymer, polyester and other main materials, which can be used as PCB single-layer board, PCB double-layer board and PCB multi-layer board. Flexible circuit boards are mainly used in moving parts such as cameras and OA machines.