Process and device for heating printed material or toner

摘要

A device and process for fixing a toner onto a substrate or a printed material, especially a sheet-shaped printed material, preferably for a digital printer, which is characterized in that the printed material that has the toner is irradiated with microwaves from at least one microwave emitter and is heated to melt the toner and that a toner is used which exhibits a sharp drop of the modulus of elasticity G' from its solid to its liquid state when it is heated. Preferably, the ratio of the value of the modulus of elasticity G' of the toner according to the invention at the reference temperature value, calculated from the starting temperature at the beginning of the glass transformation of the toner plus 50° C., to the value of the modulus of elasticity G' at the starting temperature itself is <10-5.