Structural Decay Metric
Delamination probability quantifies the loss of adhesion between laminated paper layers or coatings during high speed converting operations. An interface damage variable tracks these localized shear failures at the bond point under mechanical stress. Tensile loads across the Z-direction of a sheet trigger this internal separation.
Moisture fluctuations change the strength of these synthetic or starch based adhesives. The index provides a mathematical limit for machine settings on folder gluers and web presses.
Mechanical Threshold
Adhesive failure occurs when internal strain exceeds the cohesive energy of the interface. This interface damage variable calculation relies upon the ratio of applied peeling force to the measured bond energy of the sample. Precise calibration requires standardized pull testing at constant velocity to ensure repeatability across different grades.
Higher values indicate an increased tendency for edge flagging or surface pick during automated processing. Manufacturers maintain lower levels to prevent catastrophic rupture in heavy duty packaging applications.
Production Boundary
Converting equipment maintains strict tolerances based on the maximum allowable internal strain for a specific stock. Any interface damage variable exceeding the design limit triggers an automatic slowdown of the production line to reduce shear stress. Coatings applied at high coat weights require careful drying to prevent embrittlement of the underlying bond.
Heat and tension during the winding process introduce persistent fatigue into the layered structure. Rigid control of these parameters ensures the structural integrity of the final product remains within expected limits.
