Aalto University, School of Chemical Technology, Department of Forest Products Technology, P.O. Box 16300, FI 00076, Espoo, Finland.
Appl Spectrosc. 2013 Jun;67(6):661-71. doi: 10.1366/12-06961.
The interactive behavior of ink constituents with porous substrates during and after the offset print process has an important effect on the quality of printed products. To help elucidate the distribution of ink components between the retained ink layer and the substrate, a variety of spectroscopic and microscopic analysis techniques have been developed. This paper describes for the first time the use of total internal reflection (TIR) Raman spectroscopy to analyze the penetration behavior of separated offset ink components (linseed oil, solid color pigment) in coated papers providing chemically intrinsic information rapidly, nondestructively, and with minimal sample preparation. In addition, the already widely applied technique of attenuated total reflection infrared spectroscopy (ATR-IR) was evaluated in parallel and compared. The results of the ATR-IR Raman clearly revealed an improvement in uppermost depth resolution compared with values previously published from other nondestructive techniques, and the method is shown to be capable of providing new knowledge of the setting of thin (0.25-2 μm) offset ink films, allowing the spreading and the penetration behavior on physically different paper coating surfaces to be studied.
在胶印过程中和之后，油墨成分与多孔承印物的相互作用对印刷品的质量有着重要的影响。为了帮助阐明油墨成分在残留油墨层和承印物之间的分布，已经开发了多种光谱和显微镜分析技术。本文首次描述了使用全内反射（TIR）拉曼光谱法来分析分离的胶印油墨成分（亚麻籽油、固体颜料）在涂布纸上的渗透行为，该方法能够快速、非破坏性地提供最小的样品制备，并且具有化学内在信息。此外，还对已经广泛应用的衰减全反射红外光谱（ATR-IR）技术进行了平行评估和比较。ATR-IR 拉曼的结果明显显示出与以前发表的其他非破坏性技术相比，在最上层深度分辨率方面的改进，并且该方法能够提供对薄（0.25-2μm）胶印油墨膜的设置的新认识，从而可以研究在物理性质不同的纸张涂布表面上的扩展和渗透行为。
