Abstract
Characteristics of inkjet-grade paper coating were evaluated by applying various coating layers on a plastic substrate instead of paper. The poly (ethylene terephthalate) (PET) film had to be hydrophilized by precoating. Precoating with poly (vinyl alcohol) (PVA) was found effective for this purpose, but resulted in crack formation after the main coating. This problem could be avoided by adding optimized amount of clay to the precoating color. Four types of silica gel, a plate-shaped aluminum hydroxide, and a plate-shaped clay were tested as main coating pigment, with PVA as binder. The latter two pigments gave poor inkjet print qualities due to slow absorption of ink leading to significant dot gain and mottling. On the other hand, silica gel pigments generally gave satisfactory print quality, but it showed certain variation with the type of pigment. The time dependence of water contact angle against various coated layers showed correlations with dot shape and optical properties in inkjet printing.
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