Sputter etching was carried out at various conditions of gas pressure and sputtering energy on PPC paper, light weight and cast coated papers and further cellophane sheet as a reference, and then the etched papers were printed by using a ink-jet printer. The changes in compactness of ink dot and dot area were determined by using image analysis. Compactness of ink dot printed on PPC paper increased and the dot area decreased by sputter etching, i.e. ink-jet print-ability was improved. The ink-jet printability of light weight and cast coated papers was also improved by sputter etching. The extent of improvement of the latter was small as its original ink-jet printability was rather good. On the other hand ink-jet printability of cellophane sheet got worse by sputter etching, even though the micro structure was developed on the surface. These results suggest that the improvement of ink-jet printability needs a micro surface structure connecting to the inner pore structure which accomodates ink.
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