LAUSR

In the presented paper experimental and numerical analyses are made of the failure due to blister formation in moist packaging material when exposed to excessive heating. The basic concept of the experimental analysis is to expose a package material to a hot air jet and measure the time until the material experience internal failure. For the numerical analysis, a triphasic macroscale hybrid mixture theory approach is adopted. The in-plane permeability and the static and dynamic sorption properties of the paperboard are believed to have significant influences on the blister formation. For this reason in-plane permeability experiments and sorption experiments are performed to retrieve proper constitutive coefficients for the numerical simulations. Results from numerical simulations are compared with the experimental tests in order to better understand the physics behind the forming of a blister. The results indicate that the blister formation primarily depends on the in-plane permeability and the sorption properties of the paperboard as well as the properties of the adhesion between the paperboard and the Al-foil.