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PEER-REVIEWED ARTICLE
al . (2004) and Sodhi et al . (2008) studied the distributions of ink components in printed coated paper by combining focused ion beam (FIB) techniques with a transmission electron microscope (TEM). Yan and Li (2008) and Ozaki (2011) researched the penetration of the ink vehicle by staining it with a fluorescent dye and obtained a 3-D characterization using confocal laser scanning microscopy (CLSM). Li and He (2011) employed ultraviolet- curing fluorescent rose ink as a substitute and investigated the penetration and distribution of ink pigments by CLSM. Combining the microstructure of paper and transforming the properties of the osmotic liquid to achieve lateral diffusion leads to penetration and solidification on the papers (Enomae et al . 2012). For printing products, the ink absorption of the paper is only one aspect affecting the quality, and the overprinting accuracy of printed patterns is another factor. It is mainly manifested in the surface compressibility of the paper. This study explored the absorption properties of papers by changing the basis weight, pulp, beating, and sizing of papers. The IGT system was used to simulate the actual printing environment and perform the ink absorption experiment, exploring the effects of basis weight, pulp, beating, and sizing on the absorption of papers. Moreover, using digital printers to compare the overprinting precisions of papers with different basis weights and different fiber compositions, it was shown that the overprinting precision of hardwood paper was significantly greater than that of softwood paper, and as the paper basis weight increased, the overprinting accuracy decreased. The bleached kraft pulp of polar and pine was procured from Asia Symbol (Shandong) Pulp and Paper Co., Ltd. (Rizhao, Shandong, China). Alkyl ketene dimer (AKD) was provided by Shandong Chemicals Company. It was prepared into solution with a consistency of 10 f 0.5% and viscosity of 15 mPa Ь S at 25 °C. Di-n-butyl phthalate solution with 0.1% pigment (Sudan Red) was used to act as printing ink. Methods Beating of pulp Pulp samples were beaten in a PFI mill (A-8, Norway) at 10% stock consistency. The interspaces between the beating roll and beating chamber were 0.18 mm, and the load applied during refining was 3.4 N/mm. The beating degree was measured by the drainage of pulp. Analysis of fiber morphology Analysis of fiber morphology was performed using an OpTest Fiber Quality Analyzer (FS-5, OpTest Equipment Inc., Hawkesbury, ON, Canada). Observation of fiber morphology and paper surface aperture by polarized light microscope The surface topography of the papers was observed (10×10) using an NP-800M polarized light microscope (PLM, Nanjing Jiangnan Novel Optics Co., Ltd, Nanjing, China). EXPERIMENTAL Materials
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Dong et al . (2020 ). “Ink absorption and overprint,” B io R esources 15(1), 1397-1406.
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