Do we need better materials than teflon in marking?

Abstract

Teflon materials such as PTFE and PFA are generally known to be chemical inert and thermally stable with low surface energy. They have been the favorite materials for a variety of applications, ranging from filler in photoreceptor to additive in toner to release layer in oil less fusing to overcoat in inkjet printhead. In this work, we systematically investigate its wetting and adhesion properties using static and dynamic contact measurement techniques. In addition to model liquids such as water and hexadecane, we also studied the wetting and adhesion performance with ink and toner. Our results indicate PTFE, although, is highly hydrophobic, it is actually oleophilic and sticky towards traditional imaging materials. In most applications in xerography and inkjet printing, being non-stick with low adhesion is paramount. The requirement of a high static contact angle may be secondary. Here we also report the fabrication of a superoleophobic model surface by photolithographic technique and superior anti-offset performance was demonstrated. The need of easy clean, non-stick surfaces for future xerographic and inkjet printers is evident.