织物表面导电线路喷射打印起始端凸起形成过程研究

为提高织物表面微滴喷射打印导电线路的成形质量,针对导电线路喷射打印过程中线路沉积形貌的起始端凸起现象,利用高速相机对线路成形过程进行采集,研究微滴间融合振荡过程中左右接触角的动态变化,微滴与线路融合以及液体向线路起始端的输送过程,提出线路起始端凸起的消除方案并进行实验。结果表明:在融合振荡过程中,微滴向起始端的振荡趋势始终大于向另一侧的振荡趋势,导致打印线路起始端的织物基板润湿区域不断扩大;微滴与线路接触后,其中一部分液体润湿织物基板拓展线路长度,一部分通过线路以恒定速度输送至起始端,在线路起始端形成凸起;利用抗坏血酸溶液润湿织物表面后,成形线路起始端凸起现象得到消除,整体线路路径均匀,沉积形貌良好。

Research on forming process of bulge at start of jet printing conductive circuit on fabric surfaces

In order to improve the forming quality of the conductive circuit on a fabric surface printed by the microdroplet jet printing technique, a high-speed camera was used to capture the process of droplet-jet printing conductive circuit in view of the bulged deposition lines at the start. The dynamic changes of left and right contact angles during the fusion oscillation between droplet, the fusion of droplet with the circuits and the process of transporting liquid to the starting of the line were studied according to the bulge elimination scheme. The results show that during the oscillation process of droplets coalescence, the oscillation trend towards the starting end is always greater than the other end, causing continuous expansion of the substrate wetting area at start of the printing circuit. After the droplets contact the circuit, part of the liquid wets the substrate to extend the length of the circuit, and the rest of the liquid is transported to the starting of the circuit at a constant speed to form a bulge. The surface of the fabric moistened with the ascorbic acid solution eliminates the bulging at the start of the forming circuit, leading to formation of expected uniform dimension of the deposited lines.