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Effect of CO2 laser treatment on the leather surface morphology and wettability
Journal of Industrial Textiles ( IF 3.2 ) Pub Date : 2021-06-13 , DOI: 10.1177/15280837211022612
Ada Gulbinienė 1 , Eglė Fataraitė-Urbonienė 1, 2 , Milda Jucienė 3 , Vaida Dobilaitė 3 , Virgilijus Valeika 4
Affiliation  

The aim of this research was to determine the influence of pulsed CO2 laser treatment on crust leather surface morphology and wettability. The obtained results revealed that pulsed CO2 laser engraving can be used as an effective tool for crust leather surface treatment. Pulsed CO2 laser treatment only negligible affects the macrostructure of leather, while the morphology and wetting of the leather surface after treatment were changed. It was found that an increase of laser pulses number increases the initial water contact angle value and intensifies the water droplet relaxation process. After laser treatment, the water droplet contact angle relaxation rate increases twofold compare to those for untreated leather. SEM micrographs showed increased defectiveness with rough surface patterns, thermally affected areas, and change of microstructure. The EDX analysis revealed that the engraved leather surface contains a significantly higher amount of carbon but smaller quantities of oxygen compared to those of untreated samples. It was found that only after laser treatment chromium and sulfur in the EDX spectra appear while for untreated samples these elements on the surface were not observed. The results indicate that for investigated samples laser engraving does not affect the concentration of hexavalent chromium and are in accordance with EU requirements.



中文翻译:

CO 2激光处理对皮革表面形貌和润湿性的影响

本研究的目的是确定脉冲 CO 2激光处理对结皮表面形态和润湿性的影响。所得结果表明,脉冲CO 2激光雕刻可作为硬皮表面处理的有效工具。脉冲 CO 2激光处理对皮革的宏观结构影响微乎其微,而处理后皮革表面的形态和润湿性发生了变化。结果表明,增加激光脉冲数会增加初始水接触角值并加强水滴弛豫过程。激光处理后,水滴接触角松弛率比未经处理的皮革增加两倍。SEM 显微照片显示缺陷增加,包括粗糙的表面图案、热影响区域和微观结构的变化。EDX 分析显示,与未经处理的样品相比,雕刻的皮革表面含有显着更高的碳量,但含有更少的氧。发现只有在激光处理后,EDX 光谱中才会出现铬和硫,而对于未经处理的样品,表面上的这些元素没有被观察到。结果表明,对于所研究的样品,激光雕刻不会影响六价铬的浓度,并且符合欧盟要求。

更新日期:2021-06-14
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