Improvement of surface roughness and conductivity by calendering process for printed electronics

A mass production technique of roll-to-roll (R2R) gravure printing system with high resolution and pattern fidelity has been tested for manufacturing electronic products. Performance of printed electronics depends greatly upon the surface geometry of printed pattern such as thickness and roughness. We applied a calendering process to control the surface geometry and the resistivity of printed pattern. We also investigated the effect of process parameters including temperature, pressure, and speed. Experimental results demonstrate that the calendering process should be useful for R2R printed electronics.