What are the steps of PCBA cleaning method?

After the completion of the PCBA processing, it is common to see many residues on the surface of the PCBA. These residues not only affect the appearance, but also have an impact on the quality of the PCBA. Therefore, the cleaning of the PCBA is very important. Next, we will introduce the methods of manual cleaning and automatic cleaning.

1、 Manual cleaning

Generally, small and medium-sized PCBA processing plants use manual cleaning methods, which have low cleaning costs and are relatively cost-effective.

The tools for manual cleaning mainly include: cleaning tank, spray tank, brush, IPA or VIGON EFM, gloves, deionized water, wiping paper, air gun and sealing bag.

Steps for manual cleaning:

1. Clean the circuit board in IPA or VIGON EFM, or spray IPA and EFM onto the surface of the circuit board, using approximately 10 milliliters per 4 square inches.

2. Use a damp, soft short haired brush to continuously wipe the circuit board for about 10 seconds.

3. Rinse with deionized water, approximately 10 milliliters per 4 square inches. Effectively remove potential pollutant residues.

4. Hold the edge of the circuit board and use a clean, lint free cloth to wipe off excess deionized water.

5. Visually inspect the cleanliness of the circuit board.

6. If necessary, use an air gun to dry the circuit board.

7. If it is necessary to store the circuit board or components for a period of time before coating, please place the circuit board or components in a sealed bag containing desiccant.

2、 Automated cleaning

The automated cleaning process is divided into three methods: water cleaning, semi water cleaning, and solvent cleaning.

The tools and materials for automated cleaning mainly include water cleaning machines, deionized water systems, conductivity testers, beakers, and deionized water.

Automated cleaning operation steps:

1. Preparation of deionized water: Using an electrodialysis device and an ion exchange resin tank to produce deionized water.

2. Conductivity testing: Use a conductivity tester to test the conductivity of water after electrodialysis and ion exchange resin tanks. If both meet the requirements, they can be used for water cleaning.

3. Introduction of water cleaning machine: Introduce deionized water from the water storage tank into the water cleaning machine.

4. Set the parameters of the cleaning machine: the washing room and rinsing room are set to 60 ± 10 ℃; Drying room setting

It ranges from 60 ℃ to 90 ℃.

5. Set chain speed: Generally control the chain speed between 50-150cm/min.

6. After the PCBA cleaning is completed, it is taken out of the cleaning machine and stored in an anti-static turnover container. The anti-static turnover container is required to be clean and dust-free to avoid secondary pollution of the PCBA after cleaning.

The above are two methods for cleaning PCBA, hoping to be helpful to you.