Partial surface modification of printing papers can be made by corona discharge treatment with masking. Consequently, it is possible to change the wettability on surface modified portions. It is expected that this technique can be applied as a new representation of image.
In this work, coated papers and wood-free paper treated with corona discharge were analyzed by contact angle measurement, scanning electron microscopy (SEM) , scanning probe microscopy (SPM) and X-ray photoelectron spectroscopy (XPS) .
Some hydrophobic groups (C-C, C-H) were changed to hydrophilic groups (C-O, COO) through the oxygen incorporation of the corona treatment. Moreover, a part of the binder or surface sizing agent on the papers disappeared. In addition, the morphology of the printing paper was also changed by the corona treatment. Synthetically, these phenomena improved the wettability on printing papers.
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