扫描速度对1 μm连续激光清除不同颜色聚乙烯薄膜的影响特性研究

Study on the Influence of Scanning Speed on the Removal of Polyethylene Films with Different Colors by 1 μm Continuous Laser

摘要: 本研究基于热传导理论，结合扫描速度，建立了1 μm连续激光扫描清除聚乙烯薄膜的三维物理模型，开展了1 μm连续激光扫描清除聚乙烯薄膜的数值模拟与实验研究，获得了聚乙烯薄膜的温度分布规律和烧蚀形貌变化。分析聚乙烯薄膜的清除速度区间以及对应的清除速率，进一步得到了不同颜色聚乙烯薄膜的最佳清除参数。研究结果表明：当激光功率密度一定时，激光扫描速度对聚乙烯薄膜的清除速率具有显著影响，随着扫描速度的提高，聚乙烯薄膜的清除速率逐渐增大。在保证扫描过程中不产生明火的条件下，激光功率密度800 W/cm²时蓝色、粉色、紫色、绿色、黄色和红色聚乙烯薄膜的最佳清除速度分别为6.8 mm/s、3.9 mm/s、1.4 mm/s、1.3 mm/s、0.3 mm/s、0.3 mm/s。

Abstract: Based on the theory of heat conduction and the scanning speed, a three-dimensional physical model of 1 μm continuous laser scanning to remove polyethylene film was established. The numerical simulation and experimental study of 1 μm continuous laser scanning to remove polyethylene film were carried out, and the temperature distribution and ablation morphology of polyethylene film were obtained. The removal rate interval of polyethylene film and the corresponding removal rate were analyzed, and the optimal removal parameters of polyethylene films with different colors were further obtained. The results show that when the laser power density is constant, the laser scanning speed has a significant effect on the removal rate of the polyethylene film. As the scanning speed increases, the removal rate of the polyethylene film gradually increases. Respectively, under the condition that no open flame is generated during the scanning process, the optimal removal speeds of blue, pink, purple, green, yellow and red polyethylene films at laser power density of 800 W/cm² are 6.8 mm/s, 3.9 mm/s, 1.4 mm/s, 1.3 mm/s, 0.3 mm/s and 0.3 mm/s.