Special-shaped polyethylene terephthalate (PET) films are widely used in the electronics industry, and high-quality cuts is one of the core parameters for expanding scope of PET applications. In this article, 355 nm nanosecond laser is used to obtain a high-quality PET cuts. First, the laser cutting quality evaluation system based on the straightness, the width of the cuts, and the size of the heat affected zone (HAZ) was defined. Then, the influence of laser cutting parameters on the cut’s quality was analyzed by 3 factors and 5 level orthogonal experiment, and high-quality cuts (width 25.2 ± 3.6 μm, HAZ 18.4 ± 2.2 μm, straightness 2.9 ± 0.32 μm) was obtained under the optimal process parameter combination. Finally, the interaction mechanism between nanosecond UV laser and PET film with heating carbonization and hot melt as the core was explored, and the effect of laser cutting process parameters on the quality of the cuts was analyzed based on this mechanism.

异型聚对苯二甲酸乙二酯（PET）薄膜广泛用于电子行业，高质量的切口是扩大PET应用范围的核心参数之一。在本文中，使用355 nm纳秒激光来获得高质量的PET切口。首先，定义了基于平直度，切口宽度和热影响区（HAZ）大小的激光切割质量评估系统。然后，通过3个因素和5个水平的正交实验分析了激光切割参数对切割质量的影响，并在以下条件下获得了高质量的切割（宽度25.2±3.6μm，HAZ 18.4±2.2μm，直线度2.9±0.32μm）最佳工艺参数组合。最后，探讨了以加热碳化和热熔为核心的纳秒紫外激光与PET薄膜的相互作用机理，