| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating device of a foamable resin sheet whereby the whole of the foamable resin sheet of which one surface is provided with a pattern or a color and the other with nothing can be foamed sufficiently to be in an optimum state. SOLUTION: The heating device of the foamable resin sheet heats, by infrared rays, the foamable resin sheet in one surface A of which values of a color system are nonuniform and in the other surface B of which the values are uniform. On the opposite sides of the foamable resin sheet 1, a first heater 2 is disposed at a position opposite to one surface A wherein the values of the color system are nonuniform and a second heater 3 is disposed at a position opposite to the other surface B wherein the values are uniform. The value of the peak wavelength of the infrared rays radiated from the first heater 2 is larger than that of the peak wavelength from the second heater 3. COPYRIGHT: (C)2003,JPO |
