Structural Integrity
Structural failure occurs when the vertical alignment of a unitized load loses its capacity to support the gravitational forces acting upon the column. Pallet stack collapse represents a loss of stability in the secondary packaging arrangement that leads to the toppling of materials during transit or warehouse storage. Force distribution within these columns depends on the friction between adjacent layers and the stiffness of the vertical support members.
Once the internal geometry of a stack shifts beyond the centre of gravity of the load, the entire assembly falls toward the point of least resistance.
Coefficient Friction
Surface texture and coating applications on corrugated board determine the internal slip resistance between units. Manufacturers apply specific water-based varnishes or anti-slip treatments to ensure the pallet stack collapse stays unlikely under standard handling conditions. Proper application of these coatings prevents lateral movement during the acceleration and deceleration phases of logistics.
High surface friction prevents the sliding of individual sheets while low friction values increase the probability of mechanical failure.
Compression Tolerance
Vertical load capacity derives from the crush resistance of the bottom layers within a palletized unit. Stacking strength calculations must account for the accumulation of mass and the duration of the static load to prevent pallet stack collapse under warehouse conditions. Moisture absorption reduces the structural modulus of paper substrates and forces a reduction in the allowable stacking height to maintain safety margins.
Consistent humidity control in storage facilities protects the integrity of the fibre structure and prevents the gradual compression that precedes a catastrophic failure.
