| 摘要 |
<p>A drying furnace (10) provided with: an infrared-ray heater (30); a selectively reflective layer (37) that is positioned, within a furnace body (12), between a filament (31) and a coating film (82), reflects at least part of an infrared ray having a wavelength of less than 2μm, and transmits at least part of an infrared ray having a wavelength of 2-4μm; and an infrared-ray absorbing plate (70) that is positioned within the furnace body (12) at the opposite side of the filament (31) to the selectively reflective layer (37), and can absorb at least part of an infrared ray having a wavelength of less than 2μm. The infrared-ray heater (30) includes a second outer tube (35) that transmits at least part of an infrared ray having a wavelength of 2-4μm, and surrounds the filament (31). At least one of the inner peripheral surface and the outer peripheral surface of the second outer tube (35) includes the selectively reflective layer (37) in a region containing the opposite side of the filament (31) to the infrared-ray absorbing plate (70).</p> |
