How to control the alkali concentration in the packaging steel strip cleaning process?

How to control the alkali concentration in the packaging steel strip cleaning process?
　　 The alkali concentration of the cleaning solution is the most important factor affecting the cleaning effect. Whether it is simply using an alkaline degreaser or a composite degreaser containing a surfactant, the concentration of the degreaser is controlled by controlling the alkali concentration. Generally, the alkali concentration is controlled to increase the alkali concentration, which is beneficial to improve the cleaning effect. When cleaning steel belts with a lot of oil, the concentration can be controlled at 6%-8%. But if the concentration exceeds 10%, it doesn't make much sense.
　　 With the continuous recycling of the cleaning solution, the concentration of the alkali will gradually decrease, and new degreasing agent should be added in time to keep the concentration unchanged. After a certain period of use, the effective alkali in the cleaning solution can no longer be recovered, and aging fatigue occurs, and it must be completely replaced.