Effect effect silica to carboxymethylcellulose ratio in ink jet coating

Abstract

The important factors for preparing ink jet coatings are pigment, binder, and additives. The difference of these ingredients in coating will affect the coating layer properties and print quality. In this thesis, the silica pigment type, obtained from rice husk ash, having an average particle size of 6.542 µm and specific surface area of 90 m²/g were investigated. This type of silica was mixed with Poly (vinyl alcohol) (PVOH) used as a binder and Carboxymethylcellulose (CMC) obtained from bagasses having a purity of 88% and a degree of substitution (D.S.) of 0.67 as a co-binder. The coating mixtures of various proportions were coated on paper using a wire bar. The appropriate ratio of SiO₂:PVOH:CMC in this research was 100:30:2 with 15% solid content. With this ratio, the ink jet paper provided competitive ink density, line quality, dot gain, inter-color bleeding and color gamut compared to three types of commercial ink jet paper. The produced ink jet paper was more suitable to Epson printers than Canon printers.