multilayer PCB board is a printed PCB board composed of alternating conductive graphIC layer and insulating material. The number of conductive pattern layers is more than three, and the electrical interconnection between layers is realized through metallized holes. If one double-sided board is used as the inner layer, two single panels are used as the outer layer, or two double-sided boards are used as the inner layer, two single panels are used as the outer layer for lamination, and are interconnected with conductive graphics, then four or six layers of printed PCB boards can be made, also known as multilayer multilayer circuit boards.

Its PCB production process is to first blacken the inner panel graphics, add a sEMI solidified layer for lamination according to the predetermined design, then add a piece of copper foil on the upper and lower surfaces respectively, send it to the press for heating and pressurization, obtain the "double-sided copper clad plate" of the finished inner panel, and then conduct numerical control drilling according to the pre designed positioning system. After drilling, the hole wall shall be subject to pitting and de drilling pollution treatment, and then treated according to the process of double-sided plating of printed circuit board.

Compared with the production process of double-sided board, the main difference of Multilayer board is that several unique process steps are added: inner layer imaging and blackening, lamination, depression and de drilling pollution. In the same processing process, there are also some differences in process parameters, equipment accuracy and complexity. For example, the quality requirements for hole walls of multilayer plates are higher, and those for hole walls of double-layer plates are higher. In addition, the number of layers drilLED each time, the drilling speed and feed rate, and the difference of double layers. The inspection of finished products and semi-finished products is more strict and complex than that of double-sided boards.

The above is the difference between multilayer PCB board and double-sided PCB board

What are the three proofing adhesives for PCB boards and what are their main functions

The PCB in this topic refers to the printed circuit board, also known as the printed circuit board, and refers to the equipment that provides the electrical connection of electronIC components. This kind of three proofing glue is very common in the electronic industry and is also widely used. Moreover, there is no such adhesive as the three proofing adhesive for pcb board. In fact, the three proofing adhesive is applied on PCB.

Humidity is the most common and destructive factor affecting PCB performance. Excessive water will greatly reduce the insulation resistance of the conductor, accelerate the decomposition speed, reduce the Q value, and corrode the conductor. Green copper often appears in the metal part of PCB, which is caused by the chemical reaction of copper metal with water vapor and oxygen.

Why should the PCB board be coated with three proofing adhesive?

Due to the use of three proofing PCB board, it not only has the "three proofing" performance of waterproof, moisture-proof and dust-proof, but also has resistance to cold and hot shock, aging, radiation, salt spray, ozone corrosion, vibration, good flexibility and good adhesion.

Applying three proofing adhesive on PCB boards and parts can reduce or eliminate the degradation of electronic operation performance caused by adverse operating environment.

Due to the different application environments of three proofing adhesives, different end products will focus on the performance requirements of three proofing adhesives. Refrigerators, washing machines, water heaters and other household appliances are required to be moistureproof, while outdoor fans and street lamps are required to have excellent antifogging performance.

As the "protector" of PCB, the professional level of Sanfang adhesive can be seen. In this regard, when purchasing this kind of adhesive product with professional needs, it is natural to choose a professional and formal brand, so that you can use it with more confidence