1. First, check whether there is any problem with the backsheet material used. Some cheap backsheet are of poor quality. If the lamination temperature is slightly higher, air bubbles will appear.
2. Whether the positioning tape is qualified: The positioning tape used in the module has high requirements, ordinary tape cannot be used, and the tape with poor quality will react in the lamination temperature range of 130-140 degrees, resulting in back air bubbles appear on the board.
3. EVA quality problems: EVA will also appear bubbles when it is damp or the quality is not good.
4. The lamination temperature is not well grasped: the lamination temperature of various materials is different, and some materials may have bubbles when the difference between the actual temperature and the matching actual temperature is 2-3℃.
5. Check the air compressor, silica gel plate, sealing ring and vacuum pipeline to see if there is any problem with the vacuum system. If there is a problem with the vacuum system of the laminator, then the vacuum of each battery plate will not be clean, and there will be air bubbles. If the silicone plate is broken, the entire module will be full of air bubbles.
6. The evacuation time is not set properly. Generally, the evacuation time for conventional laminators and materials is 5-6 minutes. If it is less than 4 minutes, problems may occur.
7. Check whether the EVA and the backsheet are polluted by dirt: the EVA and the backsheet may be unclean during cutting, and may be contaminated with foreign objects, impurities, etc., and bubbles may also appear.
