Transport of Oleic and Acetic Acids from Emulsions into Low Density Polyethylene; Effects on Adhesion with Aluminum Foil in Laminated Packaging

Three test emulsions were prepared by adding oleic acid and/or acetic acid to a fatty food simulant (oil‐in‐water emulsion) from rapeseed oil, using Tween‐80 as emulsifier. These test emulsions and the blank were packed in laminated material and stored for 4 wk at room temperature (21°C). Sorption of oleic acid into LDPE and the rate of acetic acid permeation through LDPE were highest for emulsions containing both oleic and acetic acids. A complete delamination within 4–7 days occurred for all acid‐containing test‐emulsions, probably caused by formation of a weak boundary layer (WBL).