Apparatus and method in a paper machine twin-wire cylinder...

Details Apparatus and method in a paper machine twin-wire cylinder... Apparatus and method in a paper machine twin-wire cylinder...

D - Textiles, Paper

21

F

34/23

D21F 5/04 (2006.01)

Patent

CA 1336535

A web travelling through a twin-wire cylinder drier of a paper machine is subjected to a suction effect as it separates from a drying cylinder within a negative pressure zone provided at a region of its run at which it is in contact with the drying wire so that the length of the open draw of the web is substantially reduced. The negative pressure zone is produced by a gas jet which is directed through an oblong passage defined by the outer surface of the drying wire situated on the drying cylinder and by the surface of a wall of a blow box. By directing the gas jet through the oblong passage, the boundary-layer flow following the drying wire is substantially reversed in direction to flow in a direction opposite to the run of the drying wire to thereby produce a negative pressure space at the rear side of the passage.

569636

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