| 摘要 |
PROBLEM TO BE SOLVED: To hold a temperature atmosphere in a heat treatment furnace uniform and to maintain the state for conducting a stable heat treatment by covering a periphery of a hot air diffusing nozzle with a heat insulator. SOLUTION: A hot air diffusing nozzle 32 is designed to cover a part surrounded by a shaded part with a heat insulator and to minimize a heat radiation Q1 from the nozzle 32 to an atmosphere V2 flowing from an exit/ entrance port 33 of a slit sealing structure. In a flame resisting furnace 31 for treating multi-filaments, a frontage of a filament exit/entrance port is lengthened, and the nozzle 32 indispensably lengthened in a lateral direction of the furnace, and hence its heat insulation characteristics are improved while suppressing its own weight deflection of the nozzle to a minimum limit by constituting it of a thin honeycomb member of a heat insulator part. Thus, a temperature difference in a heat treatment chamber can be made uniform, thereby assuring stability of its process. |
