Priyanti Ika, Wongsawaeng Doonyapong, Ngaosuwan Kanokwan, Kiatkittipong Worapon, Hosemann Peter, Assabumrungrat Suttichai
Research Unit on Plasma Technology for High-Performance Materials Development, Department of Nuclear Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
Division of Chemical Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep, Bangkok, 10120, Thailand.
Sci Rep. 2024 Jun 6;14(1):13035. doi: 10.1038/s41598-024-63683-8.
This work features a new corona discharge plasma technology for de-inking yellow, blue, and red colors on various papers. This work was developed to minimize the chemical and environmental impacts of de-inking processes. A nonchemical contribution, operating at room temperature and atmospheric pressure, reduces the environmental impact of the process. The deinkability factor (DEM) values for all papers are determined with the optimal assessment results provided by a 36-mm variation gap at 2-min (blue) and 10-min (yellow and red) plasma exposure times, followed by applied voltages of 20 kV (yellow), 16 kV (blue), and 20 kV (red). The corona discharge plasma led to 48.58% (yellow printed paper), 64.11% (blue printed paper), and 41.11% (red printed paper) deinkability without altering the physical properties of the paper itself. The change in the tensile strength for the plasma-exposed paper was relatively little, less than 10%, compared to that of common recycling. The tensile strength of the untreated white paper was 5065 ± 487.44 N/mm, and that of the plasma-treated printed paper was 4593 ± 248.47 N/mm. It appears that there is little impact on the physicochemical properties of paper induced by the corona plasma treatment during the de-inking process.
这项工作采用了一种新型的电晕放电等离子体技术，用于去除各种纸张上的黄色、蓝色和红色油墨。开展这项工作是为了尽量减少脱墨过程对化学和环境的影响。一种在室温及大气压下运行的非化学作用方式，降低了该过程对环境的影响。所有纸张的脱墨性因子（DEM）值是通过在等离子体暴露时间为2分钟（蓝色）和10分钟（黄色和红色）、变化间隙为36毫米的情况下得到的最佳评估结果来确定的，随后施加的电压分别为20 kV（黄色）、16 kV（蓝色）和20 kV（红色）。电晕放电等离子体在不改变纸张本身物理性能的情况下，实现了48.58%（黄色印刷纸）、64.11%（蓝色印刷纸）和41.11%（红色印刷纸）的脱墨率。与普通回收相比，经等离子体处理的纸张的抗张强度变化相对较小，小于10%。未处理的白纸的抗张强度为5065±487.44 N/mm，经等离子体处理的印刷纸的抗张强度为4593±248.47 N/mm。在脱墨过程中，电晕等离子体处理对纸张的物理化学性质似乎影响很小。
