Bond Resistance
Mechanical force per unit width required to separate a bonded pressure-sensitive label or tape from a rigid or flexible substrate at a specified angle and speed. Standard testing protocols measure adhesive peel strength in kilonewtons per metre or grams per inch using controlled tensile crosshead speeds. The metric quantifies resistance to debonding along the adhesive interface during conversion or final package opening.
It applies exclusively to pressure-sensitive adhesives and pressure-laminated films, stopping at the boundary where cohesive material destruction of the liner substrate occurs before interface separation.
Failure Mechanism
Polymer entanglement and interfacial contact area govern the magnitude of the measured separation force during crosshead movement. When tensile stress pulls the face material away at ninety or one hundred eighty degrees, deformation concentrates within a narrow wet-out zone near the peeling front. High separation speeds increase viscoelastic resistance within acrylic or rubber formulations, elevating force values compared to slow static loading.
Cohesive failure leaves adhesive residue on both surfaces, whereas adhesive failure yields clean separation from the test panel. Surface energy mismatch between adhesive and liner board directly alters debonding resistance during high-speed applicator operations.
Substrate Boundary
Surface roughness of coated paperboard reduces real contact area and lowers measured resistance. Standard glass or stainless steel test panels eliminate paperboard variability during quality auditing.
