PAPER making!
FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ®
Volume 10, Number 2, 2024
Barrier, converting, and tray-forming properties of paperboard packaging materials coated with waterborne dispersions
ANDREA MARINELLI 1 , JOHANNA LYYTIKÄINEN 2 , PANU TANNINEN 2 , BARBARA DEL CURTO 1 & VILLE LEMINEN 2
In this work, different food-contact experimental and commercial aqueous polymeric dispersions were applied to paperboard via rod coating technology to achieve <5% non-cellulosic content. Barrier (water, moisture and grease), mechanical (tensile and bending) and converting (heat-sealing and creasing) properties were analysed before tray formation trials on pilot-scale equipment. Dispersion-coated samples were compared against polyethylene terephthalate (PET) extrusion-coated paperboard, the principal industrial material used for food trays. Results show that, within the investigated properties, waterborne dispersions can achieve similar barrier properties compared with PET, yet at lower dry coat grammage (12 g/m 2 vs. 40 g/m 2 of PET-coated paperboard). Additionally, the investigated coatings heat-sealed at temperatures as low as 80 – 90°C, almost 100°C less than PET; however, lower seal forces could be achieved (15 – 20 N/(25 mm) vs. 23 N/(25 mm) of PET-coated paperboard). Paperboard delamination occurred at the highest seal forces. Dispersion-coated trays were obtained at 4.5 – 5.0% blank moisture content. Formed trays at industrial processing parameters showed critical coating damage during converting due to tensile stresses. This work shows that milder processing conditions allow a reduction in coat defects. Contact Details: 1 Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy. 2 Lappeenranta-Lahti University of Technology LUT, Lappeenranta, Finland.
Packag Technol Sci. 2024;37:149 – 165. https://onlinelibrary.wiley.com/doi/full/10.1002/pts.2784 This work is licensed under the Creative Commons Attribution License
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology International ® and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
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Article 8 – Barrier Coating and Tray Forming
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