Risography
The risograph is an in -cylinder pressure process by run stencil printing process on the type of screen printing technology . The process was developed by the Japanese company Riso, where the process gets its name from. In 1986 the Japanese company RISO Kagaku Corporation brought the first Risograph (Riso for short) onto the market. At that time mainly used for cheap and fast reproduction in schools and authorities, risography developed more and more into a popular printing technique for specialized publishers, designers, artists and illustrators. Risography is characterized by the fact that the color is applied to the paper without the use of chemicals and heat. The ecological advantage is accompanied by low consumption costs.
Color-separated grayscale PDFs are sent from the computer to the Risograph or read in via the integrated scanning unit. The Riso lasers a master foil for each color, which is stretched over a printing drum with a very fine steel screen. By rotating the drum, the color is pressed through the screen and through the lasered master foil onto the paper that runs under the drum. The process is similar to screen printing. The Riso color palette consists of around 20 standard colors. There are classics such as black and red, but also fluo-pink and fluo-orange. In addition, white, matt gold and much more are possible.
In contrast to offset or screen printing, small editions of ten or more can be economical with riso printing. The effort for creating a master and setting up the printer is manageable. It is also pleasant to work with long print runs because the Risograph can print around 150 sheets per minute.
As the ink dries slowly, only uncoated papers can be used for risography .
Usually black or colored monochrome is printed, whereby special colors are also possible. Image rasters to create fine gray value levels can be made directly from the original using a button setting. Risographs of the newer generation can be controlled directly by a computer like a network printer; newer devices also allow two-color printing in one printing process. The latest Riso devices, which allow four-color high-speed printing in one printing process, are based on the inkjet process and therefore do not work according to the principle described here.
Individual evidence
- ↑ Stéphanie Seematter: Risography - the ideal printing technique? (PDF) F + F School for Art and Media Design Zurich, February 21, 2014, accessed on September 1, 2016 .
- ↑ a b c d https://www.metapaper.io/wiki/risographie/. Retrieved October 11, 2017 .