Recycled Containerboard Compression Loss under Constant Atmospheric Humidity
Recycled containerboard loses up to 45% compression strength under constant 85% RH; specify ISO 2233 derated SCT metrics to prevent static stack collapse.
Pallet Deadload Factor
Structural Calculation
Load distribution analysis determines the vertical compressive stress applied to the base layer of a shipping unit by the combined weight of stacked pallets. This pallet deadload factor quantifies the permanent force exerted by upper tiers upon the bottom substrate during static storage or warehouse transit. Engineering models utilize this constant to assess the risk of fiber crushing in corrugated containers.
Vertical stacking strength requirements depend entirely on this value to prevent structural failure at the bottom of the column.
Packaging Integrity
Converting facilities adjust board specifications according to the calculated compression resistance of the primary container. Engineers evaluate how much dead load the base material sustains before the fluting profile experiences permanent deformation. High humidity reduces the load-bearing capacity of cellulose fibers.
Manufacturers calibrate testing protocols to account for these environmental variations. Stacking height limits rely on the interaction between the deadload factor and the creep resistance of the box material.
Operational Variance
Dynamic forces during vehicle vibration frequently modify the effective weight distribution across the base surface. Heavy pallets resting on irregular floor surfaces create pressure points that exceed the uniform load assumptions of standard stack tests. Precise pallet alignment ensures that the vertical load transfers through the corners of the box where structural strength reaches the maximum level.
Misaligned units increase the localized deadload factor to a point that triggers collapse regardless of the rated box strength. Proper alignment remains the primary defense against unexpected load failure.