| 摘要 |
An apparatus is disclosed, which serves to contact with a flowing gas two mutually opposite, substantially flat and substantially circular annular surfaces of an annular cylindrical workpiece having an inside diameter not in excess of a predetermined maximum inside diameter. The apparatus comprises an oven housing, which contains two mutually opposite plenum chambers, which are defined by respective side walls which are spaced apart in an axial direction and define between them an oven chamber adapted to accommodate said workpiece in a position in which each of said side walls faces one of said surfaces of said workpiece, each of said side walls being formed with orifice slot means, and a fan for supplying a gas to said plenum chambers. In order to ensure that the said surfaces of said workpiece will be uniformly supplied with said gas, said orifice slot means in each of said side walls consist of a circular annular slot, which is concentric to said circular annular slot in the other of said side walls, and the inside diameter of each of said circular annular slots exceeds the inside diameter of said annular workpiece, whereby said annular workpiece is adapted to be positioned in said oven chamber in a position in which said circular annular slots are concentric to said substantially circular surfaces of said workpiece.
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