| Abstract | Plastic packaging is used in very large volumes and is essential for food preservation. Each year, approximately 1.5 million tonnes of plastic packaging waste is generated, representing 47% of plastic waste in Canada, with the majority ending up in landfills. There is an urgent need for a sustainable alternative. Paper-based packaging could offer a potential solution, owing to its advantages of renewability, recyclability, and biodegradability. However, paper-based packaging cannot withstand high humidity and water exposure unless it is protected by water-resistant coatings. Current water-resistant coatings are based on per- and polyfluorinated alkyl substances (PFAS), also known as "forever chemicals," which are potentially toxic to human health and harmful to the environment.
Laminating hydrophobic polymers onto paper is an effective alternative. Currently, the most commonly used plastic for lamination coating is LDPE, rendering the package neither recyclable nor compostable. Some bioplastics have been developed for paper lamination coatings; however, they are expensive and not readily accepted at composting facilities. In this study, the NRC has developed cost-effective starch-based bioplastics for paper lamination with improved oxygen barrier properties and accelerated composting capabilities. This development will promote packaging innovations in both the Canadian forestry and manufacturing industries, potentially creating new business opportunities and supporting the Government of Canada's Zero Plastic Waste and Circular Economy Agenda. |
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