Mainly, the water in the lightbox is heated by the lamp tube and then flows back to the cooling machine. The cooling coil of the refrigeration unit in the water tank heats and cools the water, and the cooled water is pumped back to the light box by the water pump. In short, it has a cooling effect on the heat emitted by the UV lamp. After the transformation of the water cooling pipeline of the UV curing system, the purpose of reducing the temperature of the UV cooling circulating water has been achieved. In extreme high temperature weather in summer and when two printing color group UV curing systems are turned on at 100% power, the temperature of the UV cooling circulating water can meet the process requirement of 26.8 ℃. In the past year of production and use, there have been no further cases where the printing quality was affected by the high temperature of the UV cooling circulating water, and the problem has been effectively solved.