PCB refers to printed circuit board, which is the provider of electrical connection of electronic components. It is very common in the electronic industry, and the conformal coating is also widely used. There is no adhesive of PCB three proofing glue (paint). In fact, it is to apply a layer of conformal coating on PCB.
Conformal coating materials is to prevent PCB from being damaged by external factors and improve the service life of PCB. As high-end electronic products have higher and higher requirements for PCB quality, three proofing paint is widely used on circuit boards.
Factors likely to cause PCB damage:
Moisture is the most common and destructive factor to PCB. 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 PCB has copper green, which is caused by the chemical reaction of metal copper with water vapor and oxygen.
Hundreds of pollutants found casually on printed circuit boards have the same destructive power. They can lead to the same results as moisture erosion, such as electronic decay, corrosion of conductors and even short circuit. The pollutants often found in the electrical system may be the chemical substances left in the process. These pollutants include flux, solvent release agent, metal particles and marking ink.
There are also major pollution groups caused by human hands, such as human grease, 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 proofing glue (paint)?
The PCB coated with conformal coating materials can not only be moisture-proof, dust-proof and waterproof, but also have the properties of cold and heat shock resistance, aging resistance, radiation resistance, salt fog resistance, ozone corrosion resistance, vibration resistance, good flexibility and strong adhesion. When affected by the adverse factors of the operating environment, it can reduce or eliminate the decline of electronic operation performance.
Due to the different application environment of different end products, the performance requirements of three proofing 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 need excellent anti fog performance.
How to quickly and efficiently apply conformal coating to PCB?
In the PCB processing industry, there is a fully automatic equipment dedicated to coating protective paint for circuit boards -conformal coating machine, also known as three proof paint coating machine, three proof paint spraying machine, three proof paint spraying machine, three proof paint spraying machine, etc., which is dedicated to controlling the fluid and covering a layer of three proof paint on the surface of PCB, such as covering a layer of photoresist on the surface of PCB by impregnation, spraying or spin coating.
The conformal 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. It can be used to draw lines, circles or arcs.
Conformal coating machine is a spraying equipment specially designed for spraying three proof paint. Due to the different materials to be sprayed and the applied spraying liquid, the component selection of the coating machine in the structure of the equipment is also different. The three anti paint coating machine adopts the latest computer control program, which can realize three-axis linkage. At the same time, it is equipped with a camera positioning and tracking system, which can accurately control the spraying area.
Post time: Apr-09-2022