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在对人造皮革的激光加工中,利用长脉冲激光加工人造合成革产生结构破坏难以解决,因而利用超快激光对PU合成革材料打孔的物理加工方式。选用脉宽为400fs,重复频率为50kHz的激光进行打孔,结合有限元分析软件仿真,分析不同布孔方式的应力分布和气体流量,得出正方形的布孔方式具有比较高的抗撕裂能力和透水气能力;然后通过调整激光功率、离焦量、波长、扫描线速度以及所打孔的大小,布孔方式等,寻找出一组对激光仪器适合的具体参数,并对不同布孔方式的皮革进行抗撕裂强度和透水气性检测试验确认排列方式带来的影响与仿真吻合,最终改变孔数使得到的PU合成革满足透水气性提高15%,抗撕裂强度不低于未处理材料60%的要求。
In the artificial leather laser processing, the use of long-pulse laser processing of synthetic leather to produce structural damage is difficult to solve, so the use of ultra-fast laser drilling of PU synthetic leather material physical processing. The pulse width of 400fs and repetition rate of 50kHz laser were used to drill holes. The stress distribution and gas flow rate of different patterns were analyzed by the finite element analysis software simulation. The results showed that the square pattern of the holes has higher tear resistance And then through the adjustment of laser power, the amount of defocus, wavelength, scan line speed and the size of the hole to be drilled, etc., to find out a set of specific parameters suitable for laser instruments, and for different ways Of the leather tear strength and water vapor permeability test to confirm the impact of the arrangement and simulation match, the final change in the number of holes so that the PU synthetic leather to meet the water vapor permeability increased by 15%, tear strength not less than Handle 60% of material requirements.