Quantifying Surface Elevation Variance along Score Lines Using Optical Profilometry
Optical profilometry quantifies score elevation variance down to sub-micron resolution, identifying die wear and coating micro-fractures before carton assembly.
Barrier Coating Rupture
Integrity Failure
Structural breakdown of protective polymer or mineral layers on paper packaging destroys the resistance of the substrate to liquid or gas migration. A barrier coating rupture typically occurs during converting processes such as folding or scoring, where local elongation exceeds the tensile limit of the coating material. This failure creates microscopic pathways that expose the underlying paper fibers to external elements.
Stress Threshold
Mechanical deformation during box erection and high-speed filling subjects the coated board to intense localized stress. A barrier coating rupture is highly dependent on both the elasticity of the formulation and the thickness of the applied layer. When the coating lacks sufficient flexibility, it cannot withstand the bending angles required for carton construction.
Permeation Consequence
Loss of barrier performance allows moisture or grease to enter the package and compromise the shelf life of the enclosed product. Once a barrier coating rupture has occurred, the rate of water vapor transmission increases exponentially at the crease lines. This leads to premature softening of the packaging structure and can cause food spoilage or mechanical collapse of the carton under humid storage conditions.
Protecting against this breakdown is a primary objective of packaging design. Selecting polymers with high elongation at break values helps prevent these mechanical failures during folding.