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Infrared dryers heat a wet sheet using radiant heat transfer. A hot surface gives off infrared radiation, which is absorbed by the fibers and the water around the fibers. The absorbed energy quickly heats the water to its evaporation temperature and drives the water from the sheet. Infrared radiation can be generated either by electrical elements or by passing natural gas through a catalyst coated material, which burns the gas without a flame to create a very hot surface. Although the drying rate created by infrared heaters is much higher than conventional steam heated dryer cylinders, the overall economics are not as favorable. For that reason, infrared heating is used only in specialty situations.