Paper Degradation
Post-consumer recycled packaging stock loses structural integrity during long warehouse storage cycles because humidity breaks hydrogen bonds inside the cellulose network. Temporal credit decay measures the gradual reduction of stacking strength warranty values over time in unconditioned distribution centres. Converting mills apply this metric when assigning stacking performance limits to corrugated containers held past standard seasoning windows.
The rating stops applying once packages enter temperature-controlled transit lanes or immediate cold chain distribution.
Moisture Absorption
Ambient humidity migration into fluting media accelerates stiffness loss across the entire carton profile. Cardboard samples exposed to fluctuating relative humidity levels exhibit lower compressive resistance than dry laboratory specimens. Converting plants test these material samples under controlled atmospheric conditions before issuing carton load certificates.
Stacking strength formulas must include a degradation coefficient to prevent warehouse collapse during extended inventory holds.
Inventory Aging
Warehouse management systems track storage duration to prevent box failures on lower pallet tiers. Corrugated containers lose a specific percentage of initial box compression strength each month under normal ambient storage conditions. Facility operators adjust maximum pallet stacking heights downward as the storage duration extends past ninety days.
Material degradation rates accelerate rapidly when ambient temperatures exceed forty degrees Celsius in unventilated storage bays.
