The paperboard is not straight and bends inward toward the single-sided paper.

The reason is that the single-sided paper is too wet to be used in different conditions. The temperature of the facial paper on the double-sided machine is too high. The humidity on the single-sided paper is too high, causing the cardboard to warp in the direction of single-sided paper or tending away from the hot plate. Heater-Le spoon angle, or reduce the operating speed of the tile line to reduce the temperature on the hot plate of the double-sided machine, reduce the single-sided machine
- The gluing amount of the different facial papers increases the tile line speed, or decreases the temperature of the double-sided machine. The temperature of the single-sided paper preheater and the single-sided cardboard preheater is increased (at the end of the overpass).
If possible, reduce the hotplate temperature to reduce the amount of glue on the single-sided board to the minimum allowable. Reduce the wrap angle of the double-sided paper preheater. Reduce the amount of paper accumulated on the bridge. Replace the dry single-sided paper. Segmented sprayers for paper rolls and wet double-sided paper rolls on double-sided paper