The reason for the warping of corrugated carton paperboard - if the paper expands due to increased humidity and the paper returns to its original humidity environment, the paper will shrink to less than the original size in the vertical and horizontal directions。This phenomenon is known as the hysteresis effect..If the same steps are repeated on the same piece of paper again, the paper will shrink further overall, but the degree of shrinkage decreases with each iteration。High moisture paper paper absorbs excess moisture more easily than the original dry paper。If the paper is heated, similar to the expansion and contraction effect, the water absorption effect will be enhanced。

Classification standard of carton

According to the paper, there are corrugated cartons, single-layer cardboard boxes and so on。Cardboard boxes are commonly used in three layers, five layers, seven layers are less used, each layer is divided into paper, corrugated paper, core paper, face paper, tea board paper, kraft paper, core paper with corrugated paper, various paper color and feel are different, different manufacturers of paper consumption (color, feel) is not the same。Different corrugated shapes, bonded into the function of corrugated cardboard is also different。Even if the same quality of face paper and inner paper are used, due to the difference in corrugated shape, the performance of the corrugated board is also different。