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Dysearrangement ved luftbåret banetörking, og fremgangsmåte for forbedring av varmeoverföring ved luftbåret banetörking
Dysearrangement ved luftbåret banetörking, og fremgangsmåte for forbedring av varmeoverföring ved luftbåret banetörking
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机译:用于机载幅材干燥的喷嘴布置以及用于改善机载幅材干燥期间的热传递的方法
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摘要
A nozzle arrangement in an airborne web-drying apparatus for drying a coated paper web (10) or the like. The nozzle arrangement comprises at least one overpressure nozzle (14), which is arranged to blow drying air both in the web's travel direction and against the web's travel direction. The nozzle arrangement comprises further a direct impingement nozzle (16) combined with the exit side and/or the entrance side (26) of the overpressure nozzle, in which direct impingement nozzle a plurality of nozzle slots or nozzle orifices (17) are formed in order to blow drying air mainly perpendicularly toward the web. The perpendicular distance (a1) from the nozzle surface (30) of the direct impingement nozzle (16) to the web is larger than the perpendicular distance (a2) from the supporting surface (32) of the overpressure nozzle (14) to the web.
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