FIELD: production of carbon fibers. SUBSTANCE: furnace for continuous heat treatment of long materials has graphite heater with current leads installed in end faces of graphite heater. Current leads have slots for treated tows. Slots are located so that their axes are located above external surfaces of heater and may be arranged in several rows depending on furnace dimensions. Furnace may be arranged in several rows depending on furnace dimensions. Furnace also has cooled body with heat-insulating holder, inlets and outlets of inert gas and feed and receiving rollers. EFFECT: higher efficiency. 3 dwg
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