METHOD AND APPARATUS FOR IMPROVING THE DRYING CAPACITY OF A HOOD COVERING A YANKEE CYLINDER

摘要

A method and an apparatus for improving the drying capacity of a hood covering a Yankee cylinder (10), when drying a web with a Yankee cylinder while conveying the web over the cylinder by blowing hot air jets against the web at the region of a first hood (12), said hot air jets having a temperature mainly < 550 DEG C. The drying capacity of the drying hood is increased by blowing hot air jets against the web conveyed over the cylinder at the region of a second hood, a so called hot air hood (14, 14', 14''), said hot air jets having a temperature which is higher than the temperature of the hot air jets blown against the web at the first hood, or mainly > 550 DEG C.