Characterisation of the opening behavior of multilayer films with cohesive failure mechanism by in situ peel tests in the ESEM

In this work, peel tests inside the chamber of an ESEM (in situ peel tests) are describedwith heat-sealed test specimens of packaging systems made of multilayer films thatsimulate different flexible packaging types, according to the packaging line used. Thein situ peel tests provided evidence to describe the influence of three different mainaspects of the packaging process in relation to the opening behavior of the sealingpackages. The investigated aspects are the peel angle, the alignment angle betweenthe orientation of the multilayer films and the seal, and the bulge formation as a consequenceof inadequate sealing parameters. In situ peel tests enabled the differentiationbetween peel angle and local (micro) peel angle, which results from the overall stiffnessof the multilayer structure film. Alignment angles of 90 and 45 were found to producesimilar opening forces. Images showing the formation of various new local micro fissures on new planes during the in situ peel test explained how the opening force canbe dramatically increased during the tearing of two sealed multilayer films.