The balanced moisture content of cardboard box printing paper refers to the situation where the moisture content mixed in the paper is abnormally stable under abnormal temperature and humidity conditions in the surrounding environment. Only when there are significant changes in the surrounding environment can the moisture content of the paper change significantly, which may lead to a loss of balance. If the moisture balance of the cardboard box is lost, the paper may wrinkle, which can greatly damage the aesthetics of the printed cardboard box.

In fact, the equilibrium moisture of paper is one of the dynamic equilibrium moisture, which means that the moisture absorption rate and dehumidification rate of the paper are equal at this time. As long as the temperature and humidity of the surrounding environment change, the equilibrium moisture of the paper also changes. After a period of moisture absorption or dehumidification, a new dynamic equilibrium of moisture is established under new conditions.