Moisture plasticizes secondary fibre bonds, reducing Mode I and II fracture energy thresholds and causing delamination during thermal finishing and creasing.
Asymmetric hygroexpansion across recycled boxboard plies induces internal shear stresses and curl, demanding strict moisture control to avoid converting scrap.
Cyclic microclimates degrade recycled paperboard inter-ply shear strength through moisture expansion mismatch and starch bond mechanical fatigue.
Inter-deck thermal radiation drives anisotropic sheet expansion, causing tail-end register drift that requires precise substrate grain alignment and lamp modulation.
Crosslinked polyurethane soft touch films crack under cyclic humidity when interfacial shear stress exceeds film yield strength at elevated substrate moisture content.
Recycled boxboard interlaminar shear thresholds decay non-linearly above 65% RH due to fiber hornification and starch matrix plasticization.
GAB isotherm modeling parameterizes microfibril monolayer saturation, identifying plasticization thresholds to qualify moisture barrier paperboard under PPWR and food contact rules.
Microfibril moisture binding follows GAB sorption kinetics where mesopore condensation above M0 plasticizes fiber networks, requiring crosslinking to preserve barriers.
Predicting downgauged boxboard creep buckling under cyclic tropical humidity requires integrating mechano-sorptive strain compliance into structural failure models.
Polyethylene film wraps trap moisture desorbed by paperboard during thermal swings, elevating internal relative humidity and triggering mechanosorptive failure.
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