Nine Major Reasons for Corrugated Cardboard Flattening and Countermeasures

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Introduction: Flattened corrugated cardboard significantly reduces compressive strength and affects the structural integrity of the carton. Below are the primary causes and corresponding solutions.

Causes:
1. Misaligned corrugating rolls (tilted corrugation).
2. Low corrugation height or worn corrugating rolls.
3. Re-flattening after corrugation formation.
4. Excessive tension on the core paper roll.
5. Over-saturation of core paper due to excessive steam.
6. Glue application flattening corrugations.
7. Uneven tension on conveyor belts (inclined corrugation).
8. Flattening after corrugation formation.
9. Low compressive strength of core paper.

Countermeasures:
1. Adjust corrugating rolls to ensure parallel alignment.
2. Replace worn corrugating rolls.
3. Inspect and adjust all potential flattening points, including paper guide rollers, pressure systems, and conveyor belts.
4. Reduce braking force on the base paper frame and check preprocessor settings.
5. Reduce steam application on the core paper.
6. Adjust glue application gap.
7. Maintain consistent conveyor belt speeds.
8. Investigate factors causing post-corrugation flattening or tilting.
9. Replace core paper rolls and consult with suppliers for quality improvements.