Corrugated Board Warpage Analysis and Control (1)

In the production process of corrugated paper, defects in warpage of corrugated cardboard often occur, and in severe cases, the normal production of subsequent processes will be affected, so that the rate of scrapping will be greatly increased, resulting in waste and increased production costs. For this reason, in the production process of corrugated paper, the occurrence of warpage of corrugated cardboard must be avoided as much as possible. This is an effective way to reduce consumption and reduce costs. This paper discusses and discusses the causes of the warpage of corrugated board and its peers.

Classification of Corrugated Cardboard Warpage

According to the different warping phenomenon of corrugated board (Fig. 1), it can be roughly divided into five types: vertical positive warping, longitudinal reverse warpage, transverse positive warpage, horizontal reverse warpage and compound warping.

1. Longitudinal positive warpage: As shown in (a), the warpage of the paperboard in the direction perpendicular to the corrugation, in which the paper is recessed inward, is called longitudinal positive warping. This warping phenomenon occurs more in the production of corrugated cardboard.

2. Longitudinal warpage: As shown in (b), the warpage of the paperboard outward in the direction perpendicular to the corrugation is called longitudinal warpage. This warping phenomenon is less frequent in corrugated board production.

3. Lateral positive warping: As shown in (c), the warpage of the paperboard in the direction of the corrugations, concave inwards of the paper, is called transverse positive warping. Such warpage often occurs in offset printing. Face paper in corrugated board.

4. Lateral warpage: As shown in (d), the warpage of the cardboard in the direction of the corrugations is called transverse warpage. This is also a frequent occurrence in the production of corrugated cardboard. Warp phenomenon.

5. Compound Warpage: There are two or more types of warpage on a piece of corrugated cardboard, which is called composite warping.