Investigating the influence of moisture and temperature on adhesion and barrier properties in laminates

University essay from Lunds universitet/Förpackningslogistik

Abstract: A world leading food processing and packaging company, Tetra Pak works with the vision of ‘Protect what’s good’ and aims to be a pioneer in developing sustainable packaging. Tetra Pak offers a wide range of carton packaging out of which aseptic carton packages are the most common. Aseptic cartons have laminate packaging material with six layers consisting of paperboard, aluminium (Al) and polyethylene (PE). While recycling the cartons post-consumer consumption, it is difficult to separate Al and PE layers. Hence, Tetra Pak is focusing on developing alternative packaging materials with decreased amount of aluminum and polymer and increased amount of fibers. One of the new packaging materials (NPM) is a non-foil packaging material with reduced Al content. The change in material structure influences its barrier properties against oxygen and moisture along with mechanical properties such as adhesion. The barrier properties and adhesion are mainly influenced by two factors such as temperature and moisture. This thesis work is conducted in collaboration with Tetra Pak and focuses on studying the influence of temperature and moisture on the parameters adhesion, oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) over time on five variants of NPM. Adhesion, OTR and WVTR tests were performed at different temperature and humidity levels. The evaluation of adhesion results showed that PM 10802 had clear split between the metallized layer and polymer layer. The OTR test revealed that PM 10802 had values closest to the reference value when compared to the other variants. While the WVTR values obtained were far away from the reference value, PM 10802 was comparatively closer to the reference value. Overall, this variant exhibited better properties when compared to the other variants.

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