Coating PCB
The coating is a specially formulated material used to protect circuit boards and related equipment from environmental erosion. It has good resistance to high and low temperatures; After curing, it forms a transparent protective film that can protect the circuit from damage in situations such as chemical substances, vibration, moisture, salt mist, humidity, and high temperatures. So what are the coating processes? Let’s take a brief look below:
1、 Brush coating – widely used and can produce excellent coating effects on smooth surfaces.
2、 Automatic dip coating – dip coating ensures complete film coverage and does not cause material waste due to excessive spraying.
3、 Selective coating – Accurate coating without wasting materials, suitable for large-scale film covering, but with high requirements for coating equipment. More suitable for large-scale lamination. Using a prepared XY table can reduce masking. When painting PCB, there are many connectors that do not require painting. If the adhesive tape is too slow to apply and there is too much residual adhesive when tearing, consider making a combination cover according to the shape, size, and position of the connector, and positioning it with installation holes. Cover areas that do not require painting.
4、 Spraying – the use of spray can type products can be easily applied to maintenance and small-scale production. The spray gun is suitable for large-scale production, but these two spraying methods have high requirements for the accuracy of operation, and may produce shadows (where the lower part of the components is not covered with the coating).
The above is the coating process for PCB, hoping to be helpful to you.