| 摘要 |
Convection heat treating apparatus for thermal treatment of a traveling substrate that maintains the temperature of the treatment gas so as to eliminate formation of streaks in the substrate without overheating the interior walls of the machine. A pivotally mounted flow control means has integrally formed portions to simultaneously control the flow of treatment gas through an application chamber inlet, and adjacent branch opening which allows treatment gas to pass from a distribution chamber to return chamber for reheating and recirculation without passing through the application chamber and onto the fabric web, and a by-pass opening disposed radially outwardly from the branch opening which permits the treatment gas to pass directly to the circulation means without reheating. The flow control means is adapted to vary the opening of at lest one application chamber inlet between closed and open and to maintain the branch opening closed when the application chamber inlet is varied between open and partially opened to an intermediate extent, and to open the branch opening when the inlet is closed from the intermediate extent.
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