In the production process of paper mounting machine, if the paperboard curls after mounting. Serious cardboard curling will greatly affect the subsequent die-cutting work, resulting in die-cutting out of position, reduce efficiency, and even affect the squareness of the box, weaken the compression strength of the whole box, so how to avoid cardboard curling after mounting?

　　1. Use the paper mounting machine with high solid content to mount glue. The higher the solid content of glue, the less water it contains. And the glue with high solid content can reduce the gluing amount per unit area of paperboard, which can ensure that the absorption of water per unit area of paperboard is greatly reduced, so as to achieve the purpose of improving the curling.

　　2. In order to ensure that the paperboard does not appear curling defects in the mounting process, it is necessary to ensure that the length is vertical and the width is horizontal, so that the size change range will be smaller. Moreover, because the short side is in the horizontal direction and the long side is in the vertical direction, the absolute value of Web shrinkage is much smaller than that of horizontal printing, which can reduce the warpage.

　　3. In the process of mounting, the paperboard that has just been mounted is stacked in the opposite way, which can also improve the curl of paperboard to a certain extent.