PCBA Tech - Why do PCBA circuit boards sometimes need to be glued?

Why do PCBA circuit boards sometimes need to be glued?

Customers often ask the PCBA factory during PCBA processing, do we need to do glue dispensing process for our products? At this time, we will communicate with the customer and determine whether to do the dispensing process based on the actual use of the product in the future. Next, we will talk about the glue dispensing process and when we need to do the glue dispensing process in detail.

1. What is the dispensing process?

We searched for the dispensing process, and you can see the explanation about the dispensing process on Baidu Encyclopedia: Dispensing is a process, also called sizing, gluing, potting, dripping, etc. It is a combination of electronic glue, oil or Other liquids are applied, potted, and dripped onto the product to make the product play a role in sticking, potting, insulation, fixing, and smooth surface. According to the explanation given by Baidu Encyclopedia, we can understand that the dispensing process is actually a process to protect the product.

2. Why do we need to do glue dispensing process?

The dispensing process has two major functions: preventing solder joints from loosening and moisture-proof insulation. Most of the places that need dispensing process are those that are located on the PCB with weak structures, such as the chip. When the product is dropped and shaken, the PCB will oscillate back and forth, and the oscillation will be transmitted to the solder joint position between the chip and the PCB, which will cause the solder joints. Cracked. At this time, the glue does make the solder joints completely surrounded by the glue, reducing the risk of cracking in the solder joint itself. Of course, not all PCBAs will use the dispensing process, because its existence also brings some drawbacks, such as the complexity of the production process and the increase in the difficulty of dismantling (it is difficult to remove the chip if it is stuck, it needs to be removed first)

Objectively speaking, dispensing will improve the reliability of the product. It is responsible to the user. Not dispensing can reduce costs. It is responsible to yourself. At the process level, dispensing is not a necessary option, and it is not necessary for cost considerations. However, it is a good practice to improve product reliability and avoid quality hazards. It should be done out of accountability to users. Whether or not to dispense glue should be judged according to the actual use of the product.

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