Interfacial fracture toughness in laminated paperboard depends on substrate z-direction fiber strength, controlled corona energy, and scoreline strain management.
Interfacial shear strain from thermal mismatch drives delamination; controlling cooling gradients and dyne levels prevents bond failure at crease lines.
Interfacial peel strength verification in metallized foils mandates ninety-degree fixture isolation to prevent substrate yield and accurately measure metal-polymer bond mechanics.
Evaluating surface energy decay in thermal TPU lamination requires measuring polar force components to ensure bond strength before heat and pressure passes.
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