RISO technology is based around a simple and reliable process. It provides printed matter at a much higher speed than most other commercially available systems.
A RISO duplicator first scans the document to be printed, and then digitally reproduces it on a master sheet. This sheet is then wrapped around an ink drum, which turns at high speed whilst paper passes underneath.
By using a drum, a RISO duplicator is able to print at up to 185 copies per minute, even in A3 format, offering a far higher output speed than most conventional office printing technologies.