PCBA trükkplaadi ultrahelipuhastustehnoloogia

In the water-based cleaning process, if the use of ultrasonic cleaning, the use of ultrasonic in the cleaning liquid propagation process produces a large number of small air bubble "hole effect" can effectively remove the insoluble dirt from the electronic joint plate. Considering the compatibility requirements of printed circuit boards, electronic components and ultrasonic waves, the ultrasonic frequency used for cleaning printed circuit boards is generally about 40KHz. Water - based cleaning process includes cleaning, rinsing, drying three processes. First of all, with the concentration of 2 percent -10 percent water-based cleaning agent with heating, brushing, spraying spray, ultrasonic cleaning and other physical cleaning means to clean the printed circuit board in batches and then with pure water or ionized water (DI water) for 2-3 rinsing, and finally for hot air drying. The high cost of water-based cleaning is caused by the need to use pure water for rinsing. Although high quality water quality is a reliable guarantee of cleaning quality, in some cases, good cleaning effect can also be achieved by using deionized water with a low cost conductivity of 5um·cm for rinsing, and then using high-purity deionized water with a conductivity of 18um·cm for rinsing. A typical water cleaning process is shown in Figure 1. A typical process is: batch cleaning of the electronic circuit board with water-based cleaning agent at 55 degree , with strong jet cleaning for 5min, then rinsing with deionized water at 55 degree for 15min, and finally drying with hot air at 60 degree for 20min. In order to improve the utilization rate of water resources, tap water used in the cleaning process or deionized water used in the rinsing tank, according to literature, the use of tap water (hard water containing more ions) in the pre-cleaning can not only greatly reduce the production cost, but also its sewage removal ability is no worse than soft water or deionized water.