Axial Strength
Standardized compression testing of short corrugated board specimens against parallel rigid platens quantifies ultimate load-bearing capacity prior to fluting wall collapse. In containerboard evaluation, edgewise compression resistance defines the maximum force per unit length that a vertical strip of corrugated board withstands before structural failure. ISO 3037 defines test parameters for determining edge crush performance using wax-embedded or necked specimen geometry.
The test value calculates directly into McKee equation formulas to predict top-to-bottom compression strength for assembled shipping cartons. Linerboard ring crush values and corrugating medium flat crush properties combine to determine total column resistance. High-density virgin kraft liners yield superior performance compared to recycled testliner grades of equivalent grammage.
Column Performance
Box design specifications rely on accurate compressive measurements to calculate safe pallet stacking heights in humid warehousing environments. If edgewise compression resistance drops below design thresholds, bottom-tier corrugated boxes crush under static warehouse loads, damaging enclosed retail goods. Converting plants track this property across single-facer and double-facer production runs to detect adhesive bond failure or fluting profile damage caused by worn corrugating rolls.
Operating starch corrugating adhesive units at optimum gelatinization temperatures preserves full fluting wall strength.
Fracture Boundary
Test results become invalid when specimen edges show crushing or burring from dull sample cutter blades prior to loading. Damaged test edges initiate premature localized buckling that underestimates true structural capacity.
