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PEER-REVIEWED ARTICLE
Effect of Papermaking Conditions on the Ink Absorption and Overprint Accuracy of Paper Yuanfeng Dong, a Binshou Wang, b Hairui Ji, b Wenyuan Zhu, c Zhu Long, a, * and Cuihua Dong b,c, *
The ink-absorption capacity is an important factor for evaluating the printing quality of paper. In this study, the effects of different parameters of papermaking on the ink-absorption capacity of paper were investigated. The results showed that hardwood pulp exhibited better performance in increasing the absorptivity of paper compared with softwood pulp. When the content of hardwood pulp in paper was increased from 0% to 100%, the ink mark length decreased from 5.1 cm to 4.3 cm. Furthermore, a basis weight change from 100 g/m 2 to 60 g/m 2 increased the ink-absorption capacity, as revealed by a decrease of the ink mark length from 4.8 cm to 4.4 cm. Both sizing agent and beating degree affected the ink-absorption performance of the paper. For example, a shorter ink mark length of 5.1 cm was obtained at a low beating degree of 5000 r compared with that of 5.1 cm at 15000 r.
Keywords: Ink absorption; Pulp; Sizing; Beating Contact information: a: Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China; b: School of Light Industry Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 300175, China; c: Jiangsu Provincial Key Lab of Pulp and Paper
Science and Technology, Nanjing Forestry University, Nanjing, 210037, China; * Corresponding authors: longzhu@jiangnan.edu.cn; xiaodong771111@163.com
INTRODUCTION Printing technology continues evolving with the development of society (Kwon and Kim 2007; Kim et al . 2012). Paper is one of the most important printing substrates and has played an important role in the improvement of printing speed and quality, especially paper with high ink-absorption capacity (Havlínová et al . 1999). The strength of the ink absorption significantly affects the printing hue of the printed matter and the glossiness. If the adsorption of paper to ink is too fast, then the vehicles in ink will penetrate into paper too much, resulting in a printing product that looks dull. Otherwise, the bad adsorption of paper to ink will reduce the drying rate of printing product, which will further result in a dirty product (Jiang et al . 2011; Pjanic and Hersch 2015). Paper is a porous material, unlike other substrates such as plastic film or tinplate. It has a layered structure similar to soil and sedimentary rock, and is accompanied by many capillary structures (Reme and Helle 2002; Chinga-Carrasco 2009). Because the voids formed by the fiber network are the basis for the ink absorption of paper, the absorption capacity of the ink is an important quality index of printing papers. In recent decades, various advanced tools and techniques have been used to study the penetration of ink into papers; microscopy has received much attention due to its accurate and efficient capture of the infiltration details of ink in papers. Ngo et al . (2017) used scanning electron microscopy (SEM) to investigate the ink penetration of different coated paper cross-sections. Heard et
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Dong et al . (2020 ). “Ink absorption and overprint,” B io R esources 15(1), 1397-1406.
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