PCBA Tech - How to clean the vapor phase of PCBA

In order to improve the cleaning effect of PCBA cleaning, it is usually combined with ultrasonic cleaning.

How to clean the vapor phase of PCBA

The vapor-phase cleaning of PCBA is a kind of wave soldering that heats the solvent through the equipment to vaporize the solvent, and uses the solvent vapor to continuously evaporate and condense, so that the cleaned printed circuit board workpieces constantly "sweat" and bring out pollutants. cleaning method. In order to improve the cleaning effect of PCBA cleaning, it is usually combined with ultrasonic cleaning.

1. The principle of gas phase cleaning

At the bottom of the gas-phase cleaning equipment is a heating soaking device and an ultrasonic cleaning tank. A few round cold meter tubes are installed around the wall of the upper tank to form a condensing temperature zone ring. When the solvent is heated to the vaporization temperature, it starts to evaporate and also evaporates to the workpiece to be cleaned. When the solvent vapor rises to the position of the annular condenser, the solvent vapor condenses and falls on the workpiece to be cleaned. Because the solvent vapor is very pure, the solvent vapor is used to continuously evaporate and condense, so that the cleaned work piece constantly "sweats" and brings out the contaminants generated during SMT chip processing and post-soldering welding.

2. Gas phase cleaning process

1. First soak the workpiece in the heated cleaning solvent to make the contaminants like.

2. Ultrasonic cleaning to free the contaminants on the surface of the workpiece.

3. Gas-phase cleaning. Gas-phase cleaning is equivalent to Ge gas. The separation gas of the solvent is very pure.

Wash the workpiece "sweat" and bring out contaminants.

4. Rinse with a cleaner cleaning solvent.

5. Finally spray with clean cleaning solvent.

The PCBA gas phase cleaning equipment has two structures: single tank and multi tank. When the single tank cleaning machine is cleaning, the workpiece is moved up and down. The bottom of the cleaning tank is heated and soaked and ultrasonically cleaned, and then the cleaned workpiece is lifted. Perform gas-phase cleaning between the soaking sound tank and the cold pipe, and finally use a clean cleaning solution. When multi-tank washing machine is used, the cleaned workpiece moves laterally from one tank to the last tank, and heats in each tank. Soak and ultrasonic cleaning, while performing vapor phase cleaning, rinse in the second tank (some equipment has three rinsing tanks), then lift the cleaned workpiece up and spray it with a clean solvent. Finally, it is naturally dried in an exhausted environment.

Single and double troughs are used for the first stage of small batches, and multi troughs are used for large batches.

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