Creasing for corrugated board-Corruagted board creasing machine

Creasing for corrugated board-Corruagted board creasing machine

Creasing of corrugated board is an important technique used in the production of e.g. boxes.
To fold a board in a proper way, crease lines are applied to define the folding line and to reduce the necessary moment to create a fold.
When board is creased by a creaser, permanent deformation is induced. Locally it decreases the stiffness and the board is easily bent along the crease line. The local deformation causes an increase of stress and eventually may result in cracking of the board. Figure 1.3 shows a part of an unfolded box which contains a crack in the inside liner.
Cracking of the outside liner also occurs. This is not caused by the creasing process. It occurs after the folding process. Board sheets are folded in a way to minimize storage space, so 180 degrees folds are commonly applied. When board sheets are piled up, the 180 degrees folds may cause cracking of the outside liner.
Both failures are not desired, because they strongly decrease the stiffness of the structure. Humidity and temperature vary during the seasons in the papermaking process. In practice it is noticed that this influences the mechanical behaviour of paper and causes more cracking during the winter season.

Figure : A piece of corrugated board with creases and cuts. Cracking has occurred in the crease in the inside liner. The problem mainly occurs normal to the fluting. MD and CD represent respectively the machine direction and the cross direction.

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