The balanced moisture content of cardboard box printing paper refers to the fact that under relatively stable temperature and humidity conditions, the moisture content mixed in the paper is relatively stable. Only when there are significant changes in the environment will the moisture content in the paper change significantly, and it may also lose its balance. If the moisture balance of the cardboard box is lost, the paper may wrinkle, which will greatly affect the beauty 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. If the temperature and humidity of the 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 the new conditions.