Structural Multiplier
Empirical coefficients used in packaging design adjust the theoretical strength of a corrugated container to account for real-world distribution hazards. In the calculation of transport performance, bct safety factors apply reductions to the laboratory-measured compression resistance to ensure the box survives warehousing stresses. These multipliers typically range from three to eight depending on the severity of the logistics chain.
The boundary of these calculations lies in the assumption of static load conditions, as dynamic transport impacts require separate engineering considerations.
Strength Reduction
Environmental factors such as high humidity and long-term storage degrade the load-bearing capacity of cellulose structures over time. Moisture absorption softens the paper fibres, which directly lowers the compression limit of the finished box.
Safety Margin
Calculation of the final performance limit requires multiplying the expected load by the combined coefficient to determine the minimum required dry test strength. If a package must support a static load of one hundred kilograms in a humid warehouse, a factor of five dictates a test requirement of five hundred kilograms. This buffer prevents premature failure under unmeasured peaks in relative humidity.
The resulting design provides sufficient resistance to prevent the creasing or lean that precedes stack failure.
