Meri Lundahl, Ville Klar, Ling Wang, Mariko Ago, Petri Kuosmanen, Orlando Rojas, Aalto University
Nanocellulose demonstrates its full strength when effectively oriented inside a material. Orientation can be achieved by wet-spinning of nanocellulose into filaments.
Filament properties are controlled by the processing:
– Nozzle size, water content in nanocellulose, winding speed -> filament thickness
– Batch spinning of 5-50 cm filaments -> strong and stiff filaments, slow process
– Continuous spinning of up to 2 km/h -> brittle filaments, scalable process
– Water-repellent additive or coating -> Stability in water
Nanocellulose filaments can be used as a reinforcement in composite materials where the combination of strength and light weight is important (e.g., materials for transportation).