Mechano Sorptive Creep Strain Derating for Secondary Fiber Packaging Design
Mechano-sorptive creep rapidly weakens recycled packaging in fluctuating humidity, requiring explicit derating factors in compression design calculations.
Transit Package Compression
Load Capacity
Vertical force that a fully assembled shipping container can withstand before structural failure occurs determines the safety of a logistics chain. Transit package compression measures the resistance of a box to the weight of the units stacked above it during transport. This value is influenced by the grade of the corrugated board, the flute orientation and the quality of the manufacturer’s joint.
Environmental factors such as high humidity greatly reduce the maximum load the structure can support.
Stacking Duration
Sustained pressure over time causes a gradual deformation of the paper fibers and the adhesive bonds. Dynamic loads can be up to several times higher than the static weight of the pallet. The box must maintain its shape to protect the primary contents from being crushed.
Structural Integrity
Distribution of the weight through the vertical corners of the container provides the majority of the stacking strength. If the transit package compression strength is insufficient, the walls of the box will bulge or buckle, leading to a collapse of the entire stack. Proper design accounts for the loss of strength caused by hand holes, printing impressions, score lines and ventilation slots.
Ensuring that the bottom container in a stack remains intact is the primary requirement for successful delivery.