PCBA Tech - Storage method for cleaning after PCB soldering

When the employees of the PCBA processing plant are soldering the PCB board, some flux, rosin and other substances will remain on the surface of the PCB circuit board. At this time, the surface of the PCB circuit board can be thoroughly cleaned with board washing water. After cleaning, The surface of the PCB circuit board will become clean; the detailed steps for the smt chip processing operator to clean the surface of the PCB circuit board are as follows:

1. The operator prepares special cotton swabs, wash water, rubber gloves, and masks during the processing of smt patch PCBA in the PCB factory. Because the wash water is a chemical substance that is easy to evaporate, inhalation is irritating to the respiratory tract and lungs. In addition, wash The board water is corrosive to the skin, so wear a mask, silicone gloves and other protective measures before cleaning.

2, squeeze the special cotton swab into the bottle mouth of the bottle containing the plate washer water, the bottle mouth will have the plate washer water squeezed out, please note: it is appropriate.

3, take the cotton swab, and gently wipe the place where there is rosin residue near the welding SMA head. If it is not clean, repeat the above procedure until it is clean.

4. Then put the clean PCB board in the designated box. If there is dust and debris on the shielding cover of the wireless module, you can stack the special paper towel into 3 layers of PCBA and squeeze it with the folded paper towel. The mouth of the small bottle of plate washer water, squeeze out an appropriate amount of plate washer water, and wipe it clean from left to right on the shielding cover once. If it is not clean, you can wipe it again.

The PCB board has passed the final product inspection, and is stored in vacuum packaging waiting for shipment. So why is the PCB board vacuum packaged and how to store it in the vacuum package.

Why PCB board vacuum packaging, this problem is very small, but many PCB circuit board manufacturers attach great importance to this problem. Because the PCB board is not properly sealed to the PCB circuit board, surface deposits, spray tin and solder pads will be oxidized, affecting Welding is not conducive to production.

So, how do you store PCB boards? The PCB circuit board cannot be placed with other products, and the PCB circuit board cannot be in contact with air and water. First of all, the vacuum degree of the PCB board cannot be damaged. When using it, a bubble film is placed around the edge of the box. The bubble film is more water-absorbing Good, so moisture-proof has played a very good role, of course, moisture-proof beads can not be less and then classify and label the emissions.

After the box is sealed, the smt patch operator must place the PCB and PCB processing circuit boards in a dry and ventilated place to avoid sunlight. The temperature of the warehouse is controlled at 23±3 degree Celsius, according to 55±10% relative humidity, under such conditions, Heavy, gold, tin, silver, and other general PCB surface treatment can be stored for six months, set silver, tin, OSP surface treatment, such as PCB can usually be stored for 3 months long-term use of PCB boards, PCB manufacturers are best to brush The upper layer of 3 anti-paint, 3 anti-paint effects can prevent moisture, dust, and oxidation. In this way, the storage life of the PCB circuit board will be increased to 9 months.