| 摘要 |
PROBLEM TO BE SOLVED: To provide a flame resisting treatment furnace for a carbon fiber precursor strand, keeping the circulating air flow in the furnace at a constant level and effective for improving the productivity of flame-resistant fiber. SOLUTION: The flame resisting treatment furnace 2 is composed of a heat-treatment chamber 4 to supply hot air perpendicular to a precursor fiber strand 5 horizontally traveling in the furnace to perform the flame resisting treatment of the strand 5, an upper flow channel 8 formed above the heat-treatment chamber 4, a lower flow channel 10 formed under the heat-treatment chamber and a hot air circulation channel 12 connecting the upper channel to the lower channel. The hot air circulation channel contains foreign material removing means 18a, 18b, a hot air circulation means 16 and a hot air velocity sensor 20. The furnace 2 is further provided with a controller 22 receiving the detection signal of the hot air velocity sensor 20, converting to an output control signal of the hot air circulation means 16 and transmitting the converted signal to the hot air circulation means 16. COPYRIGHT: (C)2006,JPO&NCIPI
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