SEALING DEVICE FOR OUTLET/INLET OF CONTROLLED ATMOSPHERE HEAT TREATMENT FURNACE

摘要

A sealing device positively performs sealing of the outlet/inlet of a controlled atmosphere heat treatment furnace. A metallic web (21) is held between a pair of elastic rolls (23) and a pair of additional elastic rolls (26) so as to seal the outlet/inlet of a bright annealing furnace (22) which continuously bright anneals the metallic web (21) in a combustible atmosphere gas which contains gaseous hydrogen and the like. Provided between the elastic rolls (23) and the additional elastic rolls (26) are intermediate rolls (25). Outer peripheral surfaces of the elastic rolls (23) are sealed by sealing plates (24). Thus an atmosphere within the furnace and outside air can be shut off from each other by seals in stages. <IMAGE>