Adhesive Peel Strength

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.