| 초록 |
As with normal coating processes, the curl, such as in cast coated paper (CCP), is an issue during the converting process. The curl can be simultaneously reduced in the machine and cross machine directions (MD and CD, respectively) by bending drying with rewetting of one side. The bending moment and drying shrinkage induced by the rewetting process dictates the curl in the MD and CD. Bending in one direction can not change the curl in the other direction without rewetting. One directional bending with rewetting of one side can change the amount of curl in the other direction. The pre-curl also has an effect on the final curl. For a given sheet structure the combination of bending moment and drying shrinkage decides the final curl shape. |
