| 摘要 |
PURPOSE:To prevent the deflection of heat insulating duct when an unhardened heat insulating duct is heated in a hardening furnace for the purpose of hardening. CONSTITUTION:The title apparatus is provided with a hot air table 20 at a lower part of a hardening furnace which is located at a downstream side of a throttling pipe 16 in the hardening furnace 10. Hot air is fed to the interior of the hot air table 20 and a tubular body 9 is kept suspended by injecting the hot air through injection holes. Thermosetting resin impregnated into glass wool mat which constitutes the tubular body 9 is set by the heat of the hot air and the heat within the hardening furnace 10, and heat insulating duct is obtained. |
