APPLICATION OF NANO-FIBRILLATED CELLULOSE AS A PAPER SURFACE TREATMENT FOR INKJET PRINTING, 2011 PaperCon Conference
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A new method is proposed to increase the print density of inkjet prints by application of a layer of nano-fibrillated cellulose (NFC) to the base sheet of an uncoated woodfree fine paper treated with AKD. The hydrophilic NFC surface holds the inkjet pigments at the surface while the AKD acts as a barrier to liquid penetration. A combination of NFC and AKD gave higher print densities and at the same time reduced print-through compared to papers treated with AKD only. CLSM images confirm that ink spreading on and penetration in untreated samples is greater than the AKD samples. For the untreated samples, the ink covered the paper surface almost uniformly with a few areas where the ink did not cover. For the AKD samples, the ink droplets contracted on the hydrophobic surface, giving poor coverage as shown by the large number of uncovered areas.