速度和体积对油墨拉伸断裂行为影响实验研究

Experimental Study on the Influence of Velocity and Volume on the Tensile Fracture Behavior of Ink

摘要: 传统印刷方式中，油墨的转移往往伴随着油墨在两界面间形成液桥并拉伸断裂，断裂结果直接决定油墨向基材的转移量，从而对印刷质量产生重大影响。近年来，印刷电子运用传统印刷工艺，实现了电子器件制造的规模化、低成本。因而，油墨拉伸断裂行为已成为印刷和印刷电子领域研究的重点问题。本文通过高速摄像机记录流变仪中两同轴平板间细微油墨拉伸形成液桥并断裂过程，对不同初始体积和拉伸速度的油墨拉伸断裂行为进行实验研究。实验测定了5种初始油墨体积(1 µL, 3 µL, 5 µL, 10 µL, 30 µL)和6种拉伸速度(0.1 mm/s, 0.3 mm/s, 0.5 mm/s, 1 mm/s, 3 mm/s, 5 mm/s)液桥的形态演化及断裂行为。实验结果表明：初始体积是液桥断裂时间与断裂长度的主导因素；拉伸速度对断裂时间影响较弱，对断裂长度的影响具有非单调性和体积依赖性。研究结果能为解析传统印刷和印刷电子中的油墨微观流体机制提供一定的实验依据。

Abstract: In traditional printing methods, ink transfer is often accompanied by the formation and stretching rupture of liquid bridges between two interfaces. The outcome of rupture directly determines the amount of ink transferred to the substrate, thereby exerting a significant influence on printing quality. In recent years, printed electronics has adopted traditional printing processes to realize large-scale, low-cost manufacturing of electronic devices. Consequently, the behavior of ink stretching and rupture has become a key research issue in the fields of printing and printed electronics. In this paper, a high-speed camera is used to record the process of liquid bridge formation and rupture during the stretching of fine ink between two coaxial parallel plates in a rheometer. An experimental study is conducted on the stretching and rupture behavior of ink with different initial volumes and stretching speeds. The morphological evolution and rupture behavior of liquid bridges are experimentally measured for five initial ink volumes (1 µL, 3 µL, 5 µL, 10 µL, 30 µL) and six stretching speeds (0.1 mm/s, 0.3 mm/s, 0.5 mm/s, 1 mm/s, 3 mm/s, 5 mm/s). The experimental results show that the initial volume is the dominant factor affecting the rupture time and rupture length of the liquid bridge. The stretching speed has a weak effect on rupture time, while its influence on rupture length is non-monotonic and volume-dependent. The findings can provide certain experimental evidence for analyzing the microscopic fluid mechanism of ink in traditional printing and printed electronics.