Paperboard Structural Creasing Mechanics and Matrix Clearance Sizing
Optimize matrix channel clearance using board caliper and rule thickness formulas to guarantee internal ply delamination while preventing outer liner score cracking.
Liner Elongation at Break
Plastic Deformation
Tensile strain at the point of rupture quantifies the capacity of a polymer film to stretch under stress before the molecular bonds fail. Liner elongation at break describes the percentage increase in length between the original gauge marks and the distance measured at the moment of separation. Higher values indicate greater flexibility in the backing material, which prevents premature snapping during high-speed adhesive application or automated dispensing processes.
Failure to maintain a consistent stretch percentage results in web breaks on narrow web presses or label dispensers that operate under high tension.
Elastic Boundary
Physical constraints dictate the performance range of siliconized substrates during the converting phase. Liner elongation at break functions as a limitation on how much mechanical force the backing withstands before permanent deformation or tearing halts the production line. Converters look for a balance between the stiffness required for die cutting and the suppleness needed for smooth feed cycles.
When a material reaches its limit, the internal structure separates, forcing a complete stop to replace the torn web.
Production Tolerance
Quality departments monitor the threshold of strain to verify the structural integrity of the supplied roll stock. Liner elongation at break serves as a predictor for how a substrate behaves when subjected to the rapid acceleration of modern labeling machinery. Manufacturers adjust the additives within the film formulation to calibrate this physical property to the specific requirements of the end application.
Consistent results depend on uniform thickness and proper curing of the release coating. A stable stretch percentage ensures the integrity of the substrate remains intact under variable operational loads.