Cellulose films for plastic-like barrier performance in packaging
Research has developed cellulose-based films and coatings said to combine transparency, strength and oxygen barrier performance.
The Finnish project is called ‘F3 – Films for Future’ and is led by VTT Technical Research Centre of Finland and LUT University, along with 34 industrial partners.
The project team developed the materials by dissolving and regenerating cellulose as a polymer rather than using it in its conventional fibrous form. This approach reportedly enables cellulose to be processed into transparent films compatible with existing packaging technologies, including thermoforming.
The standalone films are said to achieve oxygen transmission rates below 1cc/m²/day at 23°C and 50% relative humidity. This is claimed to be comparable to conventional plastic barriers.
The scientists suggest that the cellulose-based coatings deliver even higher performance, with oxygen transmission rates below 0.2cc/m²/day, alongside grease resistance suitable for recyclable fibre-based packaging.
The project demonstrated pilot-scale production for applications including dry food, bakery products and transparent barrier packaging.
The team says further development will focus on improving performance in humid conditions and scaling the technology towards commercial manufacture.
