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PEER-REVIEWED ARTICLE
Effect of Sizing on the Ink Absorption The purpose of paper sizing is to increase its hydrophobic performance, so the softwood paper can resist liquid. The effects of sizing with an AKD dosage of 0.1% on the ink absorption were also investigated.
Fig. 3. Comparison of ink mark lengths on softwood paper for sizing As shown in Fig. 3, the sizing decreased the ink absorption of the paper (the short ink mark length). For the paper with a beating number of 5000 revs, an ink mark length of 4.15 cm was observed after sizing, which was 0.65 cm longer than that without sizing. Under the weak beating, the sizing agent was evenly distributed and firmly adhered on the rough surfaces of long fibers. Its filling effects efficiently hindered the ink’s entrance into the voids on the paper surface, thus reducing the ink absorption of the paper. When the beating number increased to 15000 revs, the sizing exhibited a more effect on reducing ink absorption. The ink mark length of 5.1 cm before sizing was markedly lengthened to 6 cm after sizing, which was mainly attributed to the micro-fibrillation of fibers under high beating speed and adequate filling of voids by sizing agents. The results indicated that the sizing can inhibit ink absorption of paper, especially for that with a high beating speed. Effect of Basis Weight on the Ink Absorption Basis weight has important effects on the printing adaptabilities of paper, such as tensile strength, folding strength, and tearing strength. Increasing the basis weight will increase the opacity and color contrast of paper, thus improving the quality of printed matter. Figure 4 displays the effect of the basis weight on the ink absorption of the paper.
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Dong et al . (2020 ). “Ink absorption and overprint,” B io R esources 15(1), 1397-1406.
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