1 Unstable temperature and humidity of production environment
When the temperature and humidity of the production environment are not stable, the amount of water absorbed or lost by the paper from the environment will be inconsistent, resulting in the instability of the paper expansion.

2 New paper storage time does not meet the standard requirements
Because the physical properties of paper need a certain time to be stable, if the storage time is not enough, it will directly lead to the instability of paper expansion.

3 Offset Press edition system failure
The failure of the fountain system of the offset press results in the instability of the amount control of the fountain solution on the surface of the printing plate, which leads to the instability of the expansion and contraction of the paper due to the inconsistency of the water absorption.

 4 Printing speed changes too much
In the production process, the printing speed is fast and slow. At this time, we should pay attention to the influence of printing speed on the paper expansion stability.

5 The tension control system of gravure press is not stable
The tension control system of gravure printing machine is not stable, which will also lead to the instability of paper expansion. If the tension value changes greatly, it is necessary to consider the influence of this factor on the instability of paper expansion