What should be noted in the PCBA gluing process?

PCBA gluing is commonly used on the motherboard of washing machines and has a very good waterproof effect. When carrying out the PCBA gluing process, the following precautions should be taken.

1. Choose a suitable adhesive: commonly used silicone and epoxy sealing adhesives, and at least understand the parameters of "operation window time" and "curing time".

2. The temperature of PCBA before the can glue needs to be roughly consistent with the temperature of the glue.

3. The PCB that needs to be sealed with glue needs to be heated through a drying oven and baked to 50 ℃.

4. Excessive residue of flux needs to be cleaned to keep the PCBA board surface clean.

5. It's best to pour glue into the glue box first, and then put the PCBA in.

6. The proportion of polyurethane sealing adhesive must be accurate. The two commonly used ratio methods are 100:50 and 100:74, which are formulated based on the properties of the adhesive.

When applying PCBA glue, it is easy to generate bubbles, which is a very important issue to pay attention to.