PCB refers to printed circuit board (Printed circuit board), which is the provider of electrical connection of electronic components. It is very common in the electronics industry, and three anti-adhesive (paint) is widely used in it, and there is no such type of adhesive as PCB three-proof adhesive (paint). In fact, a layer of three-proof adhesive (paint) is coated on the PCB. paint).
Applying three anti-paints is to prevent the PCB from being damaged by external factors and improve the service life of the PCB. As high-end electronic products have higher and higher requirements for PCB quality, conformal coatings are widely used on circuit boards.
Factors that easily cause PCB damage:
Moisture is the most prevalent and most destructive major factor to PCBs. Excessive moisture will greatly reduce the insulation resistance between conductors, accelerate decomposition, reduce Q value, and corrode conductors. It often happens that the metal part of the PCB has a patina, which is caused by the chemical reaction of the metal copper with water vapor and oxygen.
Just as damaging are the hundreds of contaminants you can find at random on a printed circuit board, and they can cause the same results as moisture attack, such as electronic failure, corrosion of conductors, and even short circuits. Pollutants often found in electrical systems may be chemical substances left over from the manufacturing process. These pollutants include fluxes, solvent release agents, metal particles, and marking inks.
There are also major groups of pollution caused by human hands, such as body oil, fingerprints, cosmetics and food residues. There are also many pollutants in the operating environment, such as salt spray, sand, fuel, acid, other corrosive steam and mold.
Why apply three anti-adhesive (paint)?
The PCB coated with three anti-adhesive (paint) is not only moisture-proof, dust-proof, and waterproof, but also has resistance to cold and heat shock, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, good flexibility and strong adhesion. When affected by adverse factors of the operating environment, it can reduce or eliminate the degradation of electronic operating performance.
Due to the different application environments of different end products, the performance requirements for the conformal adhesive will be emphasized. Household appliances such as refrigerators, washing machines, and water heaters have high requirements for moisture resistance, while outdoor fans and street lamps require products with excellent anti-fog performance.
How to quickly and efficiently apply conformal adhesive (paint) to PCB?
In the PCB processing industry, there is a fully automatic equipment for coating protective paint on circuit boards – three anti-paint coating machines, also known as three anti-paint gluing machines, three anti-paint glue sprayers, three anti-paint oil sprayers, three anti-paint Paint spraying machines, etc., are designed to control the fluid, and cover a layer of conformal paint on the surface of the PCB, such as covering a layer of photoresist on the surface of the PCB by dipping, spraying or spin coating.
The three anti-paint coating machine is mainly used for precise spraying, coating and dripping of glue, paint and other liquids in the product process to the precise position of each product, and can be used to achieve line drawing, circle or arc.
The three anti-paint coating machine is a spraying equipment specially designed for spraying three anti-paints. Since the materials to be sprayed and the spraying liquids to be applied are different, the parts selection of the coating machine in terms of equipment structure is also different. The three anti-paint coating machine adopts the latest computer control program, which can realize three-axis linkage, and is equipped with The camera positioning tracking system can accurately control the spraying area.
Post time: Mar-01-2023