Delamination of Polyethylene and Aluminum Foil Layers of Laminated Packaging Material by Acetic Acid

Acetic acid solutions (0.5, 1.0 and 3.0%) were packed in polyethylene aluminum foil laminated material and adhesion between the layers was measured during 28‐days storage at room temperature (∼23°C). Peel tests showed that in 3% acetic acid adhesion between layers was almost totally lacking after 4 days. After another 3 days the adhesion started to recover, and after 14 days it had returned to 50% of the initial value. Attenuated total reflection (ATR) tests after separation of the layers demonstrated that a salt layer was formed at the PE‐AI interface, Electron scanning for chemical analysis tests showed the presence of a thick oxidized layer on the aluminum foil and a trace of aluminum on the PE film.