Public defence in Bioproduct Technology, M.Sc. (Tech.) Karoliina Helanto
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Title of the thesis: Pilot-scale filler-reinforced biodegradable coatings for paperboard packaging
Doctoral student: M.Sc. (Tech.) Karoliina Helanto
Opponent: Docent Janet Preston, Åbo Akademi University, and Imerys Minerals, UK
Custos: Professor Orlando Rojas, Aalto University School of Chemical Engineering, Department of Bioproducts and Biosystems
Paperboard packaging: The role of fillers in biodegradable barriers
Conventional fossil-based barriers on paperboard packaging materials can be replaced with bioplastics. This thesis focused on investigating the effects of mineral fillers on the processability and properties of biobarriers. The use of talc, kaolin and calcium carbonate enhanced processability by reducing neck-in and improving adhesion in pilot-scale extrusion coating process. Furthermore, the addition of fillers improved the barrier properties of the packaging material. The observed drawback caused by the fillers was the formation of pinholes in extrusion coating process with high filler content and low coating thickness. This thesis contributes to the development of sustainable packaging materials by representing the benefits and future development gaps of mineral filler addition in bioplastic-based extrusion coatings in paperboard packaging materials.
Thesis available for public display 10 days prior to the defence
Contact information:
M.Sc. (Tech.) Karoliina Helanto
[email protected]