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Causes of paper board warping in web paper composite machine

Date:2020-12-11
Info:
 In the process of paperboard Web compound machine, the problem of paper board warping can affect th

  In the process of paperboard web paper composite machine, the problem of paper board warping can affect the subsequent die-cutting work, resulting in die-cutting displacement and reducing efficiency.

  In addition to a few cases caused by the warping of face paper and corrugated board itself, the vast majority of them are caused by the size change of face paper and corrugated board after absorbing the moisture in the glue. The inconsistency of size changes leads to the curling defect after mounting. The more water is absorbed, the greater the elongation is.

Web compound machine

  If the expansion ratio of face paper is greater than that of corrugated board, the paperboard after mounting will be rolled upward, otherwise it will be bent downward.

  If the paper board will absorb all the moisture precipitation, return to the original moisture content, the face paper will be slightly smaller than the original size, but the corrugated board is slightly larger than the original size, the shrinkage of the face paper is significantly higher than that of the corrugated board, so it is easy to bend up.

  Through observation, it can be found that the expansion ratio in the transverse direction is more than 10 times that in the vertical direction. That is to say, if the length of the surface paper or corrugated board is the horizontal direction and the width is the vertical direction, the change range of its size is larger, otherwise, the change range will be smaller.


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Home / News / Industry News

Causes of paper board warping in web paper composite machine

  In the process of paperboard web paper composite machine, the problem of paper board warping can affect the subsequent die-cutting work, resulting in die-cutting displacement and reducing efficiency.

  In addition to a few cases caused by the warping of face paper and corrugated board itself, the vast majority of them are caused by the size change of face paper and corrugated board after absorbing the moisture in the glue. The inconsistency of size changes leads to the curling defect after mounting. The more water is absorbed, the greater the elongation is.

Web compound machine

  If the expansion ratio of face paper is greater than that of corrugated board, the paperboard after mounting will be rolled upward, otherwise it will be bent downward.

  If the paper board will absorb all the moisture precipitation, return to the original moisture content, the face paper will be slightly smaller than the original size, but the corrugated board is slightly larger than the original size, the shrinkage of the face paper is significantly higher than that of the corrugated board, so it is easy to bend up.

  Through observation, it can be found that the expansion ratio in the transverse direction is more than 10 times that in the vertical direction. That is to say, if the length of the surface paper or corrugated board is the horizontal direction and the width is the vertical direction, the change range of its size is larger, otherwise, the change range will be smaller.



Dongguan Chuanbo Machinery Equipment Co., Ltd.