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Directional self-cleaning surface design for ink jetting devices

机译：喷墨设备的定向自清洁表面设计

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摘要

Functional surfaces with self-cleaning property are highly desirable in many applications in the printing industry. One of the challenges in fluid ink jet systems is ink wetting and drooling onto the printhead front face. The contamination of the printhead front face leads to missing drops, wrong-sized drops, mis-directionality, and satellite drops resulting in degraded print quality. In this study, we report the creation of textured surfaces on Si wafer by photolithography, followed by chemical modification, that leads to superoleophobic, directional self-cleaning surfaces. We systematically investigate its wetting and adhesion properties with water, hexadecane and Xerox solid ink using static and dynamic contact angle measurement techniques. The textured surfaces are made of micro grooves which demonstrate interesting anisotropic wetting behavior. In the direction parallel to the grooves, low surface tension testing liquids show very low sliding angle (i.e. directional self-cleaning) which is a key enabler for the self-cleaning effect and maintenance free printhead.
机译：具有自清洁性能的功能性表面在印刷工业的许多应用中是非常需要的。流体喷墨系统中的挑战之一是墨水润湿并滴落到打印头的正面。打印头正面的污染会导致墨滴丢失，墨滴尺寸错误，方向错误和附属墨滴，从而导致打印质量下降。在这项研究中，我们报告了通过光刻在硅晶片上创建纹理化表面，然后进行化学修饰，从而形成超疏油，定向的自清洁表面。我们使用静态和动态接触角测量技术，系统地研究了其与水，十六烷和施乐固体油墨的润湿和粘附性能。带纹理的表面由微凹槽制成，这些凹槽表现出有趣的各向异性润湿行为。在平行于凹槽的方向上，低表面张力测试液显示出非常低的滑动角（即定向自清洁），这是实现自清洁效果和免维护打印头的关键因素。

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