Represented and described is a gas lance made of a fireproof material, having an entry surface and an exit surface, having channels having slit-shaped cross-section, which comprise an entry slit and an exit slit. Also provided is a printing device having a roll-to-roll printing press for printing an image to a web so as to form at least one printed roll, a roll storage unit for the at least one printed roll, and a folder for folding and cutting the at least one printed roll. Plural projections are formed by coating molding on an outer peripheral surface of the roller piece. Also, the display device can input a signal, such as a touch or others, by sensing a pressure, which is applied to the touch panel, using the sensors. The teeth of one segment are selectively engageable with the edges of a cavity of an adjacent segment.