In this report, we discuss the reason why transfer roller surface profile affects the discharge mark, and propose a new roller model for numerical simulation. Our observation has revealed that the discharge mark depends on the surface profile of transfer rollers, the conventional foam roller, smooth roller which has a smooth surface made of high polymer materials upon a foam roller, and the rough sanding roller which has the sanded surface of smooth roller. To make its dependence clear, we experimented with the electric charge distribution at transfer nip area focusing on the surface profile of the roller. Then, we build “Surface layer model” consisting of base-layer and surface-layer. The numerical simulation of electric field using this model made it clear that roller surface profile affects the discharge mark.
Ryosuke Hamamoto, Yasuo Yoda, Hiroyuki Seki, Toyoshige Sasaki, Takuma Onishi, Asako Sugiyama, "Effect of transfer roller surface profile on discharge mark" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP27), 2011, pp 105 - 108, https://doi.org/10.2352/ISSN.2169-4451.2011.27.1.art00027_1