20.500.12556/DKUM-88487 Slot‑die coating of cellulose nanocrystals and chitosan for improved barrier properties of paper Cellulose nanocrystals (CNCs) and chitosan (Cht) have been studied extensively for oxygen and water vapour barrier coatings in biodegradable, compostable or recyclable paper packaging. However, rare studies have been performed by using scalable, inexpensive, and fast continuous slot-die coating processes, and none yet in combination with fast' and high-throughput near-infrared (NIR) light energy drying. In this frame, we studied the feasibility of a moderately concentrated (11 wt%) anionic CNC and (2 wt%) cationic Cht coating (both containing 20 wt% sorbitol related to the weight of CNC/Cht), by using plain and pigment pre-treated papers. The effect of coating parameters (injection speed, dry thickness settings) were investigated on coating quantity (dry weight, thickness) and homogeneity (coverage), papers' structure (thickness, grammage, density), whiteness, surface wettability, barrier (air, oxygen and water vapour) properties and adhesion (surface strength). The coating homogeneity was dependent primarily on the suspensions' viscosity, and secondarily on the applied coating parameters, whereby CNCs could be applied at 1–2 times higher injection speeds (up to 80 mL/min) and versatile coating weights, but required a relatively longer time to dry. The CNCs thus exhibited outstanding air (4.2–1.5 nm/Pa s) and oxygen (2.7–1.1 cm3 mm/m2 d kPa) barrier performance at 50% RH and 22–33 g/m2 deposition, whereas on top deposited Cht (3–4 g/m2) reduced its wetting time and improved the water vapour barrier (0.23–0.28 g mm/m2 d Pa). The balanced barrier properties were achieved due to the polar characteristic of CNCs, the hydrophobic nature of Cht and the quantity of the applied bilayer coating that can provide sustainable paper-based packaging. paper nanocellulose chitosan slot‑die coating near-infrared (NIR) drying barrier properties papir nanoceluloza prevleka z režami pregradne lastnosti true false true Springer Nature Angleški jezik Slovenski jezik https://link.springer.com/journal/10570 © The Author(s) 2024 Članek v reviji 2024-05-06 15:13:28 2024-05-06 15:13:29 2025-07-30 10:57:57 0000-00-00 00:00:00 2024 0 0 str. 3589-3606 Vol. 31 March 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-11-01 2024-03-07 2024-03-29 677.46:620.3 191131651 10.1007/s10570-024-05847-3 0969-0239 s10570-024-05847-3.pdf s10570-024-05847-3.pdf 1 B82DBDE24E40059F016B40EF30B35C02 b6f2b6e38fb8e21c3b94b577c4a372cccab27d50375ef684fce3b8e336c47a63 531dfb26-0bab-11ef-a23c-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=179026 https://link.springer.com/article/10.1007/s10570-024-05847-3 0 15e4d1b9-0bab-11ef-a23c-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=179025 Fakulteta za strojništvo 0 0 0