D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
34/3
D21F 5/02 (2006.01) D21F 5/14 (2006.01)
Patent
CA 1088743
ROTARY THROUGH DRYER HAVING MULTIPLE VACUUM CHAMBERS AND ASSOCIATED HEATERS Abstract A fiber sheet manufacturing apparatus, such as a paper machine, is described, including a rotary through dryer for drying the sheet material on the same foraminous conveyor where it is initially formed. The dryer is pro- vided with a plurality of separate vacuum chambers circum- ferentially spaced within the foraminous dryer drum, which are each in registration with a different one of a plurality of sources of hot air outside of the drum. The hot air is transmitted through the sheet material and the conveyor into the vacuum chambers to dry the sheet material. Each of the vacuum chambers and the hot air sources is indepen- dently controlled to provide different temperatures and vacuum pressures for more efficient and versatile operation. The air is transmitted from the vacuum chambers out of the drum through their separate exhaust conduits extending through the end of the drum and spaced from the drum sup- port bearings. The drum supports and associated bearings are in the form of external trunion rollers which engage the opposite ends of the drum side wall to provide space for the vacuum chambers and exhaust conduits within the drum. The exhaust of one vacuum chamber is connected to the heat source of the next vacuum chamber to use heated air of the preceding chamber for heat conservation.
290225
Helversen Frederick D.
Rivers Morris R.
Helversen Frederick D.
Smart & Biggar
LandOfFree
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