Abstract A suitable candidate for applying nanocellulose on paper as packaging material is slot die coating, but a complex rheological behavior makes process optimization challenging. In this work, coating windows of nanocellulosic suspensions modeled as Casson fluids with different viscosities have been determined with computational fluid dynamics simulations. The dripping boundary, which is the lower limit of the processing parameters, did not exhibit a viscosity dependence in contrast to the upper boundary. An increasing viscosity led to a shrinking of the coating window. The relationship between the minimum wet thickness and the capillary number indicates that viscous forces are dominant for stabilizing the coating bead. A comparison with the analytical viscous model shows a good agreement for the lower boundary but a divergence for the upper boundary at higher viscosities, for which a modification is proposed. One possible way to counter the adverse effects of higher viscous solutions is discussed.
Maier et al. (Thu,) studied this question.
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