"The synthetic resins in printing inks are harmful to the environment because they are not biodegradable and emit volatile organic compounds. The printing industry has sought alternative printing inks to solve these issues. The aim of the work is to explore sustainable and environmentally friendly inks, without scarifying ink performance. To determine their performance and effect on print quality, soy proteins were investigated. Also, commercial and formulated acrylic inks were used as reference inks. From the results, the print density of soy protein water-based inks is higher than that of the reference inks. Moreover, they obtained a higher print gloss than the reference inks. The printing contrast values of soy protein water-based inks are relatively low. There was no considerable difference found in TVI values. Overall, the soy protein water-based inks produced a very competitive result in printability and presented high potential for replace synthetic components in current commercial inks."

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Paper is the most successful recycled material from commercial and municipal wastes. Part of recycled paper requires deinking to meet the product requirement, such as tissue, printing grade and newspaper. The original print method plays a major role in deinking performance. The digital print methods, such as electrophotographic (or laser) print, have been rapidly adapted in the commercial printing. Paper mills need to modify their procedure to deink these types of recycled paper, which contain fine toner particles. In this study, the recyclability of electrophotographic printed paper has been evaluated extensively, or three repeats with an industrial standard. Meanwhile, recycled fiber from each repeat underwent printability analysis. Except the influence from papermaking method and pulp furnish, the strength of the recycled fiber slightly declines after each repeat because of fiber deterioration, which also affected the paper surface properties. However, the recycled fiber presented good printability on each recycling, especially on print density and fine details. It suggested that the electrophotographic substrate can tolerate a high recycled fiber content.

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