柔版印刷金属网栅光电性能研究

Photoelectric properties of metallic mesh based on flexographic printing

为满足日渐增加的电磁屏蔽要求，设计了一种透明基材上柔版印刷电磁屏蔽用金属网栅，研究了影响金属网栅透光率与电磁屏蔽特性的主要因素。首先从理论分析入手，计算并分析金属网栅结构参数（线宽、周期、占空比）等对透明导电金属网栅透光率及电磁屏蔽效能的影响；接下来利用柔版印刷方式制备周期为300、400μm线宽为20、30、40μm的金属网栅，测试了在7、10、13 GHz3个频点处电磁屏蔽效能以及300~1000 nm波段的紫外-可见透过率。测试与分析结果表明：金属网栅在紫外-可见光波段透过率在70%~80%之间，且随周期/线宽增大而分别增大/减小，电磁屏蔽效能最高达到了15 dB以上。结果显示，网栅的光电特性是矛盾的，线宽与周期越小电磁屏蔽效果越好。

In order to meet the increasing requirements of the electromagnetic shielding, the principle and manufacture process of a film-taped metallic mesh were introduced and the influence of the parameters （such as the line width, period, duty ratio,et al） on optical and electromagnetic features were analyzed. By using the flexographic printing technology, the metal mesh film with the line widthes of 20, 30, 40μm and the periods of 300, 400μm on PET substrate were made, and the maximal electromagnetic shield effectiveness was more than 15 dB, while the UV-Vis transmission of metallic mesh on PET substrate was between 70% and 80%. The results indicate that the optical and electrical performance of metallic mesh film is inconsistent, and it is better to select a thinner line width and smaller period to obtain optimal shielding effectiveness.