Nanocellulose-based barrier coatings

Purpose and goal

The goal for this project is to develop barrier films of microfibrillated cellulose (MFC) for liquid packaging and to investigate how production methods of MFC affect the barrier properties (Oxygen, WVT, oil resistance) as well as mechanical properties.

Expected results and effects

The ultimate aim (or vision) of this project is to replace fossil-based barriers and flouropolymer additives (for grease resistance), in packaging materials to biodegradable nanobarriers. With a barrier material we understand barriers having resistance towards, oxygen, water vapour and oil/grease penetration. We understand from commercial practice and polymer physics that no single material can meet most commercial demands in this respect. Most commercial materials use co-extrusion and/or Al-foils. Typical target applications include food packaging, liquid packaging, and food-trays for ready to eat foods and packages where fat and oil resistance is required.

Planned approach and implementation

The work towards the final goals is divided into three stages: 1.Firstly, a quantitative method to determine the extent of delamination after homogenisation and a manufacturing method to produce strong free-standing films of MFC in a reproducible way will be developed. 2.Secondly, the effect of delamination on free-standing films will be further investigated and the effect of MFC manufacturing method on mechanical properties, optical properties and oxygen permeability of MFC films studied. 3.Thirdly, the effect of relative humidity and plasticizers on mechanical, fracture and barrier properties of MFC films will be investigated. The films will also be applied onto board and the barrier property of the final product will be investigated.