P. Tanninen, H. Lindell, E. Saukkonen and K. Backfolk
The convertibility of biopolymer dispersion-coated paperboard was determined using a novel adjustable packaging line equipped with a tray-pressing mould. Commercial paperboard was dispersion barrier coated using a dual polymer system containing both a bio and a synthetic polymer. The addition of synthetic polymer into bio-based dispersion improved the elastic properties, plasticity and, subsequently, mechanical convertibility of the product. Furthermore, moderate additions of the synthetic polymer provided improved grease resistance for the biopolymer coatings.