To prevent the gasification component of a molding assistant produced during heating from being recondensed within a furnace, and dissolve the vertical temperature gradient in the low temperature region on outlet side to the utmost.
In a continuous kiln where a baking burner 11 is provided in the middle section within a furnace, and substance to be baked is shifted for baking from the inlet side to outlet side and besides cooling air supplied from a cooling air supply nozzle 12 provided on outlet side is circulated in the direction of inlet side, exchanging its heat with the substance to be heated, firstly suction exhaust ports 21 and 21 for exhausting the gasification components which arise due to evaporation of molding assistant within the matter to be baked in heating process are arranged right before a baking zone, and secondly proper number of preheating burners 3 and 3 are arranged as independent heating means in the low temperature region on its inlet side so that desired preheating can be performed.
OGURA HIROHARU
OGAWA KENICHI
