Prof. Dr.-Ing. Edgar Dörsam
Technische Universität Darmstadt, Germany
Understanding the Pattern Formation in the Flexographic Ink Splitting Process
In graphic printing, the transfer of the printing fluid in so-called halftone printing takes place mainly dot by dot. However, functional printing requires larger homogeneous areas (e.g. for OLEDs) or small, continuous layers (e.g. for conductor paths). In functional printing, conventional printing methods therefore usually use printing forms with a high dot density or solid areas. During the printing, Saffman-Taylor instabilities, also known as viscous fingering, can occur after the printing nip on the substrate. For flexographic printing, experimental results are presented here and a modelling is shown with which the instabilities can be predicted as a function of the printing parameters.
Edgar Dörsam has been full Professor and Director of the Institute of Printing Science and Technology at the Technische Universität Darmstadt, Germany, since 2003. From 1994-2002 he was responsible for research and development at MAN Roland Druckmaschinen AG in Offenbach, Germany, a leading manufacturer for printing machines. He holds more than 30 patents and is member of IS&T, VDD, VDI and OE-A. He holds a Dipl.-Ing. (equivalent to MS) and a doctoral degree in Mechanical Engineering from Technische Universität Darmstadt.
Since 2003, his research focuses on Advanced Printing Technologies. Main research fields are “Automatization and Measurement” and “Functional Printing” with a staff of about 25 people. The research group “Functional Printing” is working on industrially and publicly funded research projects in the fields of printed electronics (OLED, sensors, RFID) and biomedical applications (test strips, chip printer for peptides).