How does it work
A Risograph printer applies the principle of a silk-screen printing press, which is based on pressing ink through openings in a screen. This template is called a stencil or master. A digital file (PDF) will be scanned at the Riso, just like a normal copier, or sent via a RIP server. Riso burns the file to a hot thermal master. Through the openings in the master, the ink is printed on the paper by running under the pressure cylinder at high speed.
The Risograph printer is a product of the Japanese company RISO KAGAKU since 1946 to develop and manufacture printing systems. ‘RISO’ means ideal and ‘KAGAKU’ technology. Although the digital duplicating machine was not developed in view of the creative industry (it was primarily intended for schools and churches), it became popular among graphic designers and illustrators because of its special quality and wide range of colors.
Soybean & Banana
Riso ink is based on soybean oil and the master include sheets made of banana leaves. This makes Riso printing considerably less damaging to the environment than other printers. After each print run the paper must dry thoroughly. The printer can only handle uncoated stocks, with weights ranging from 80 gsm up to 250 gsm. The inks for the Riso are semi-transparent. Printing two or more colors over each other creates mutiple colors. This effect works best with light colors, or shades of color.In the Uncoated Print Club , were using two Risograph GR 3770’s. There are now eleven drums with different colors available; gray, black, blue, medium blue, fluor pink, fluor orange, yellow, brown, flat gold, red and burgundy.