Intense Pulsed Light unprinting for reducing life-cycle stages in recycling of coated printing paper
Intense Pulsed Light unprinting for reducing life-cycle stages in recycling of coated printing paper
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DOI：
10.1016/j.jclepro.2019.05.387
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发表时间：
2019-09-20
影响因子：
11.1
通讯作者：
Malhotra, Rajiv
中科院分区：
文献类型：
--
作者：
Dexter, Michael;Rickman, Keri;Malhotra, Rajiv
纸张的不印刷可以减少纸张回收的多个生命周期阶段，从而产生重大的环境影响。激光解印已被证明可以用于未涂布纸，但会对涂布纸造成严重损坏。这项工作探索了一种可扩展的光学（非激光）工艺，用于铜版纸的退印。将印刷的涂布纸暴露在氙灯发出的脉冲广谱强脉冲光（IPL）下，然后用乙醇擦拭，轻轻擦去碳粉。虽然黑色碳粉很容易脱印，但彩色印刷品（红色，蓝色，绿色）的脱印最好通过合并黑色碳粉的初始套印来实现。实现了毫米(2)/秒的解印吞吐量。根据墨粉去除和纸张损坏的程度，确定了三种不同的退印制度。未打印纸张的光学性质，通过紫外可见分光光度法表征，与这些制度相关，以了解原位光学过程监测的潜力。扫描电子显微摄影和傅里叶变换红外光谱的执行，以了解潜在的机制，控制不同的脱印制度的发生。此外，在当前光学解印方法的能力和消除传统纸张回收中生命周期阶段的可能性的背景下，讨论了开发的方法对纸张回收的潜在影响。(C) 2019 Elsevier Ltd.版权所有。
Unprinting of paper can reduce multiple life-cycle stages in the recycling of paper to yield significant environmental impact. Laser-unprinting has been demonstrated for uncoated paper but causes significant damage to coated paper. This work explores a scalable optical (non-laser) process for unprinting coated paper. Printed coated paper is exposed to pulsed broad-spectrum Intense Pulsed Light (IPL) from a xenon lamp and the toner is then removed by dabbing gently with an ethanol wipe. While black toner is easily unprinted, unprinting of colored prints (red, blue, green) is best realized by incorporating an initial overprint of black toner. An unprinting throughput on the order of mm(2)/s is achieved. Three distinct regimes of unprinting are identified based on the extent of toner removal and damage of the paper. The optical properties of the unprinted paper, characterized via UV-Visible spectrophotometry, are correlated to these regimes to understand the potential for in-situ optical process monitoring. Scanning Electron Micrography and Fourier-Transform Infrared Spectroscopy are performed to understand the underlying mechanisms that govern the occurrence of the different unprinting regimes. Further, the potential impact of the developed approach on recycling of paper is discussed in the context of the capabilities of current optical unprinting approaches and the potential elimination of life-cycle stages in conventional paper recycling. (C) 2019 Elsevier Ltd. All rights reserved.