Printed/Coated Functional Structures – Applications, Materials, Printing/Coating Techniques
The lecture will be focused for an overview on topic of functional structures fabricated by using printing/coating techniques. It will be highlighted differences in comparison to conventional graphic printing as well as FAQ, requirements, pitfalls accompanying functional printing/coating. The next part of presentation will deal about printing substrates, conductive, semiconductive, dielectric and the others materials, including their ink formulation forms. Likewise will be described typical applications from simple functional layers to more sophisticated multilayer devices. In last part of lecture will be presented an overview of printing and coating techniques, their basic parameters and examples of their usage for various applications. At the end of presentation will briefly mentioned selected approaches of drying/sintering/annealing for functional layers.
For functional printing applications, the different printing processes provide different levels of suitability and show specific pros and cons. In these two courses, we will go through the technical aspects of gravure and screen-printing, their capabilities and their main applications. Presently screen-printing is the most versatile and most widely used printing process for functional printing and printed electronics, since it can print on very many substrates and a wide range of printing pastes up to very high solid contents and viscosities. Gravure, however, works fine on the opposite range of viscosities and dilute liquids. For both processes printing forms are required and we will see which are the most critical and important parameters in printing form preparation. Only, if you utilize an excellent printing form then you can achieve excellent results.
“Paper electronics – Paper as substrate for printed electronics and sensors”
Mass-produced paper electronics (large area organic printed electronics on paper-based substrates, “throw-away electronics”) has the potential to introduce the use of flexible electronic applications in everyday life. While paper manufacturing and printing have a long history and are considered among the greatest inventions of mankind, they were not developed with electronic applications in mind. Modifications to paper substrates and printing processes are required in order to obtain working electronic devices. This should be done while maintaining the high throughput of conventional printing techniques and the low cost and recyclability of paper. Influence of paper properties on printed functional devices, and possibilities to improve compatibility with printed electronics is discussed. Examples demonstrator devices printed with a custom built roll-to-roll hybrid printer are shown.