| abstract |
A heating device (10) for producing carbon fibers from a filamentary fiber starting material (12) is described, wherein the heating device (10) comprises a central tubular induction heating element (14) through which the fiber feedstock material (12) passes, the tubular induction heating element (14 ) is surrounded by a heat insulation (18), at least one middle to high frequency induction coil (22) outside the heat insulation (18) is provided, and the central induction heating element (14) in particular for carbonization and / or graphitization of the fiber starting material (12) of an inert gas is flowed through. For energy optimization, d. H. to achieve optimum efficiency, a first and a second tubular element (26, 28) made of transparent material for the induction field of the middle to high-frequency induction coil (22) are provided on the outside of the heat insulation (18), which are separated from one another by an annular gap (30 ) are spaced, which is traversed by the inert gas. |