In the production of color coated board, it is necessary to go through a step, called water washing. Its main purpose is to ensure that the product can be more beautiful, and at the same time, it can also check whether there are problems of porosity or porosity defects, in order to prevent the subsequent use of difficulties, so it is necessary to carry out this step.After alkali erosion, there will be a large amount of alkali etched tank liquid film on the surface of color coated plate. In industrial production, it is called water washing after alkali etching, and the color coated plate after alkali erosion is relatively difficult to clean. Firstly, it is necessary to ensure the accuracy of the product cleaning technology. For the first water tank, it is necessary to maintain the appropriate water temperature and alkalinity, so there is no need to change water. The purpose is to make sure that the water quality of the first tank is appropriate It can maintain a good cleaning effect, and in the process of cleaning can carry out appropriate stirring, and after many times of work can be judged according to the workload, reduce the waste of water.