Yang Haifeng, Hao Jingbin, Wang Haoda, Ding Mengsen
School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China.
Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining & Technology, Xuzhou 221116, China.
Materials (Basel). 2023 Jul 19;16(14):5079. doi: 10.3390/ma16145079.
As a technology for polymer surface fabrication, roll-to-roll hot embossing has been widely used because of its advantages, such as its low cost and high efficiency. However, the metal micro-mold is a major factor that determines the hot embossing of the polymer. In this study, a new metal micro-mold manufacturing method is proposed. The metal micro-mold is produced using laser shock imprinting (LSI) on the surface of metal foil. It has the characteristics of good thermal stability and high strength. During our LSI experiment, the strength of the mold increased after laser shocking. In this study, copper foils of different thicknesses were selected for LSI experiments. Through the analysis of the profile and forming depth of the microstructure, combined with the numerical simulation of the forming mechanism of copper foils with different thicknesses using ABAQUS software(Abaqus 2021), a copper foil with a flat back was selected as the final metal micro-mold. On this basis, copper molds with different microstructure shapes were created. Then, the mold was used in the hot-embossing experiment to manufacture the microstructure on the surface of polyethylene terephthalate (PET) and to study the fidelity and integrity of the molded microstructure. The deformation resistance of the copper mold under hot-embossing conditions was verified through a nano-indentation experiment. The final results show that the metal micro-mold produced via LSI had a high accuracy and molding stability and has potential applications in the field of roll-to-roll hot embossing.
作为一种聚合物表面制造技术，卷对卷热压印因其成本低、效率高等优点而被广泛应用。然而，金属微模具是决定聚合物热压印效果的主要因素。在本研究中，提出了一种新的金属微模具制造方法。该金属微模具是通过在金属箔表面进行激光冲击压印（LSI）制备的。它具有热稳定性好、强度高的特点。在我们的LSI实验中，模具在激光冲击后强度增加。在本研究中，选择了不同厚度的铜箔进行LSI实验。通过对微观结构轮廓和成型深度的分析，并结合使用ABAQUS软件（Abaqus 2021）对不同厚度铜箔成型机理的数值模拟，选择了背面平整的铜箔作为最终的金属微模具。在此基础上，制作了不同微观结构形状的铜模具。然后，将该模具用于热压印实验，在聚对苯二甲酸乙二醇酯（PET）表面制造微观结构，并研究成型微观结构的保真度和完整性。通过纳米压痕实验验证了铜模具在热压印条件下的抗变形能力。最终结果表明，通过LSI制备的金属微模具具有较高的精度和成型稳定性，在卷对卷热压印领域具有潜在的应用价值。
