Technology | Nine Common Causes of Corrugated Board Crushing and Corresponding Measures
Release Date:
2020-03-04
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If corrugated cardboard is crushed, its compressive strength will be severely compromised, which in turn directly affects the empty-carton compression resistance of the resulting box. There are numerous causes for cardboard crushing; the following sections provide a step-by-step analysis and corresponding solutions.
If corrugated cardboard is crushed, its compressive strength will be severely compromised, which in turn directly affects the empty-carton compression resistance of the resulting box. There are numerous causes for cardboard crushing; the following sections analyze each cause and propose corresponding solutions.
Cause
1. The corrugating rolls are not parallel (corrugation is skewed);
2. Low corrugation height, or wear on the corrugating rolls;
3. After corrugation is formed, it is then flattened;
4. Excessive tension on the core paper roll;
5. Due to excessive steam spraying from the spray device, the core paper is too wet;
6. The gluing device causes the corrugation at any nip point to be flattened;
7. Uneven tension in the upper and lower conveyor belts of the double-sided machine (resulting in skewed corrugation);
8. Low, flattened corrugation;
9. The compressive strength of the core paper is too low.
Measures
1. Adjust the corrugating rolls to be parallel;
2. Replace the corrugating rolls;
3. Inspect, adjust, or repair all nip points that may cause corrugated board to be crushed, such as misalignment or improper adjustment of the cross-cut knife feed roller, presser roller, or thermal plate pressure system; excessive pressure applied; tensile stress on the single-face paper web on the bridge; or issues with the lifting conveyor belt.
4. Reduce the braking on the parent paper reel; check the position of the preprocessor;
5. Reduce the amount of steam sprayed onto the core paper;
6. Reduce the glue application gap for single-face cardboard and linerboard;
7. Maintain consistent conveyor belt speed;
8. Inspect the factors that cause corrugation flattening after corrugation formation, and identify the causes of corrugation skewing;
9. Replace the core paper roll and consult with the original paper supplier.
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