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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >A comparative study on roll-to-roll gravure printing on PET and BOPP webs with aqueous ink
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A comparative study on roll-to-roll gravure printing on PET and BOPP webs with aqueous ink

机译：水性油墨在PET和BOPP网上卷对卷凹版印刷的比较研究

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ink transfer and printing characteristics in high-speed gravure printing were investigated on poly(ethylene terephthalate) (PET) and biaxial-oriented polypropylene (BOPP) substrates employing a pilot-scale gravure printing machine (maximum speed: 500 m min(-1)). The flexible substrates were printed in an aqueous ink diluted with ethanol under various machine factors such as printing speed, nip force, and groove size. The printed images and ink transfer efficiency were examined using an optical microscope, UV-visible spectroscopy, and an atomic force microscope (AFM). A quantitative study was performed on the measurements and estimation of interfacial tension. the work of adhesion, and the contact angle between the ink and the substrates to correlate with the printed features. According to the experimental results, the most critical factors affecting the print features were interpreted to be the viscosity and surface tension of the ink, and interfacial tension. The spreading coefficients of the diluted inks were below zero on both the PET and BOPP films, indicating that spreading hardly occurs spontaneously, and thus limited spreading may be associated with a shear-induced flow of ink. Among tested machine factors, the printing speed did not significantly affect the uniformity and chromaticity of the image on the PET web as observed under microscopy or spectrometry. On the other hand, those on the BOPP film were found to heavily depend upon roller speed and thus dwell time. This difference was attributed to low spreadability of the ink due to capillary immobilization effect on the porous BOPP surface. In addition, the increasing groove size (dot%) resulted in a higher chromaticity due to a larger contact area between ink and substrate. Especially in the case of BOPP, the chromaticity of the printed image increased linearly with increasing dot%. It should be also noted that the images printed on BOPP exhibited enormously higher chromaticity and thickness compared with those on PET at the same dilution and machine factors. The large difference in ink transfer efficiency between the BOPP and PET substrates may be explained partly by the difference in interfacial tension and absorption of the BOPP substrate.
机译：使用中型凹版印刷机（最大速度：500 m min（-1））研究了聚对苯二甲酸乙二醇酯（PET）和双轴取向聚丙烯（BOPP）基材上高速凹版印刷的油墨转移和印刷特性）。在各种机器因素（例如印刷速度，压区力和凹槽尺寸）下，在用乙醇稀释的水性油墨中印刷柔性基材。使用光学显微镜，UV-可见光谱和原子力显微镜（AFM）检查打印的图像和油墨转移效率。对界面张力的测量和估计进行了定量研究。附着力的作用，以及油墨与基材之间的接触角以与印刷特征相关联。根据实验结果，影响印刷特性的最关键因素被解释为油墨的粘度和表面张力以及界面张力。在PET和BOPP薄膜上，稀释墨水的扩散系数都低于零，这表明几乎不会自发地发生扩散，因此，有限的扩散可能与剪切引起的墨水流动有关。在测试的机器因素中，如通过显微镜或光谱法观察到的，印刷速度并未显着影响PET网上图像的均匀性和色度。另一方面，发现BOPP膜上的那些很大程度上取决于辊的速度以及因此的停留时间。该差异归因于由于在多孔BOPP表面上的毛细管固定作用而导致的油墨的低铺展性。此外，由于墨水和基材之间的接触面积更大，凹槽尺寸（点％）的增加导致了更高的色度。特别是在BOPP的情况下，打印图像的色度随点数百分比的增加而线性增加。还应该注意的是，与在相同稀释度和机器因素下在PET上印刷的图像相比，在BOPP上印刷的图像表现出极大的色度和厚度。 BOPP和PET基材之间的油墨转移效率差异很大，部分原因是BOPP基材的界面张力和吸收率不同。

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