I don't know much about the corrugated board production line. The suggestions I can give are probably not correct. Let's take a look:
1. The key to controlling the flatness of corrugated board is to control the production process of the single-sided machine of corrugated board production line;
2. It is necessary to select paper supporting production of corrugated paper and cardboard paper with similar water content;
3. Control the speed and temperature of the single-sided machine, etc.
Controlling the speed and temperature can also effectively prevent the bending of the product due to the obvious warpage caused by the corrugated board.