Method for subjecting a sector in a roll to negative...

Details Method for subjecting a sector in a roll to negative... Method for subjecting a sector in a roll to negative...

D - Textiles, Paper

21

F

92/15.3

D21F 3/10 (2006.01) B65H 5/22 (2006.01) B65H 20/12 (2006.01) B65H 23/24 (2006.01) D21F 5/04 (2006.01)

Patent

CA 1263045

ABSTRACT OF THE DISCLOSURE A method for applying a negative pressure over a sector of an air-pervious mantle of a roll includes providing a suction chamber within the pervious roll mantle which extends over a suction sector of the roll, directing air jets away from the suction chamber at the outermost edge portions of the suction chamber, the air jets causing air currents to be ejected from the suction chamber at the outermost edge zones thereof, the air currents thereby producing air seals at the outermost edge zones of the suction chamber without the use of contact- type sealing elements and at the same time, at least partly, providing a negative pressure in the suction chamber. A suction roll includes blow nozzles for directing air jets away from the suction chamber substantially parallel. to the tangent of the roll mantle proximate to the blow nozzles. The inlet sides of the blow nozzles are connected to a pressure. chamber situated within the roll mantle, the pressure chamber adapted to be connected to a pressure source.

506830

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