F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
98/42
F24F 7/00 (2006.01) D21F 5/04 (2006.01) F26B 13/14 (2006.01)
Patent
CA 2025408
Abstract The invention relates to a hood (2) closed at both of its ends (15) and on its sides (14), intended for being fitted over the web-drying cylinder surface (1) segment of a contact drying cylinder, usually a so-called Yankee cylinder, in which hood the flow of the drying gas is promoted by means of a partition wall (4) which is substantially parallel to the cylinder sur- face (1), extends across the whole hood (2) and is at a dis- tance from the cylinder surface (1) and the hood mantle (3), in order to form two concentric flow channels having a longi- tudinal cross sectional shape of a circle arc and conjoining substantially at the ends of the hood. The outer flow channel has an inlet (11) for the drying gas, and in its vicinity there is an outlet (12) for the damp drying gas, separated from it by means of a transverse wall (10). According to the invention, when the partition wall (4) is located at such a distance from the cylinder surface that the velocity of the drying gas is high and when it is equipped with heating ele- ments (5) connected to an external source of energy, in order to transfer heat to the drying gas by convection and to the web (W) by radiation, as high a characteristic evaporation is accomplished as is by using high-capacity hoods based on nozzle-blowing. Figure 1
Gowling Lafleur Henderson Llp
Soininen Mauri
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