Effects of Contact Angle and Viscosity on Gravure Offset Printing
Date Issued
2014
Date
2014
Author(s)
Huang, Yen-Lung
Abstract
Three topics are discussed in this study: the liquid transfer phenomenon of water and glycerol between two plates, the liquid transfer phenomenon of polymer solution between two plates and micro-scale gravure offset printing with polymer solution.
First, we used three different surfaces as plates and utilized the enhanced video-microscopy system to observe the liquid transfer phenomenon. We started with slow plate separation velocity for the experiment and adapted the Surface Evolver and FLOW-3D to verify our experiment results. Then we changed the plate velocity to understand the plate velocity effect on the liquid transfer system. According to the experiment, it is found that receding contact angle is crucial and the plate velocity influences contact angle behavior, liquid transfer rate and so on.
Second, to emulate the silver ink used in printing electronics, we added polymer and surfactant to the sample liquid because the silver ink is usually with high solid-content. High solid-content leads to that the ink is highly viscous and dispersant is necessary to make the ink homogeneous. With polymer and surfactant added, the viscosity and wettability of sample liquid are changed and the changes have significant effect on the liquid transfer phenomenon.
In the third part, we used polymer solutions with different surfactant concentrations as ink, conducting the micro-scale gravure offset printing. The results show that the surfactant concentration affects the printing quality. In addition, the influence of ambient condition such as temperature and humidity cannot be ignored for our system.
Subjects
凹板轉印
液體輸送
接觸角
後退角
液體轉移率
高分子溶液
Type
thesis
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