On-the-fly 레이저 표면 텍스처링 공정을 이용한 대면적 SUS304-PE-g-MA 복합패널의 계면 접착력 향상

초록

In this study, an on-the-fly laser surface texturing process was applied to improve the interfacial adhesion of large-area SUS304–PE-g-MA composite panels. The effects of laser power and crater overlap ratio on the surface morphology of SUS304 were first examined, and the selected processing condition was then applied to a 1200 mm-wide SUS304 panel. The crater morphology was analyzed at different positions along the width direction, and the average crater diameter and depth were 83.94 μm and 18.78 μm, respectively, with relative standard deviations of 0.3% and 8.0%, indicating uniform processing reproducibility over the large-area panel. The surface roughness of the laser-textured specimens was approximately three times higher than that of the non-textured specimens. In the adhesion test, the maximum peel load increased from 255 N to 325 N, corresponding to an improvement of approximately 27.5%. In addition, surface features corresponding to the ablation craters were observed on the peeled PE-g-MA, indicating that the molten PE-g-MA flowed into the laser-induced crater structures and was mechanically interlocked with the textured SUS304 surface during hot pressing. These results indicate that the crater-based microstructures formed by on-the-fly laser texturing enhanced the adhesion performance by promoting mechanical interlocking at the SUS304–PE-g-MA interface. Therefore, the proposed process shows potential as an in-line surface modification technique for improving the interfacial adhesion of large-area metal–polymer composite panels.

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