Semi industrial application of MFC barrier coating, a rheological and technological study, 2010 TAPPI International Conference on Nanotechnology for the Forest Product Industry

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This paper investigates the potential of MFC dispersion in coating processes. 1% to 2% water dispersion MFC were used as the starting material for coating applications on paperboard. The rheological characteristics of the dispersions were modified with commercial thickener to evaluate the influence on processability. A semi industrial coater was used with MFC coating to simulate the real requirements and indexes of the coating process applied to MFC. The final coated paperboards were characterized for Air resistance. Moreover, SEM analysis and surface analysis were used to study the final results and determine specific technological requirements. The study shows that all the different coating blends reduce air permeability. Moreover, the success of the coating application through the semi-industrial coater, confirms the utility of the additive selected. Nevertheless, a detailed study of the surface and the coating distribution was made. This last study was of great interest to understand the phenomena involved in the coating deposition in function of the final barrier capacities.