What is a printer fuser?
After the paper has been processed and has toner on it, the printer sends the paper through the printer fusing unit (fuser). The fuser 'fuses' or 'melts' the toner into the fibers of the paper making the toner permanently bind to the paper. The fuser does this by passing the paper very quickly through two extremely hot rollers. The paper then quickly leaves the fuser and flows out of the printer into the output tray.
The paper does not burn up because of the speed at which the paper moves through the fuser.