| 摘要 |
The object of the invention is an arrangement for stabilizing a paper web ( 3 ) in a paper machine, which arrangement comprises at least three cylinders ( 4, 5, 6 ) which have been arranged so that a pocket space is formed between them, a blow box ( 7 ) arranged in the pocket space, which blow box has a blow nozzle ( 12 ), in which a nozzle slot ( 19 ) has been arranged, a separate wall ( 10 ), substantially in the direction of the blow box ( 7 ), which wall has a first edge and a second edge that are substantially parallel, which has been attached from its first edge to the blow box ( 7 ), whose height in the travelling direction of the paper web ( 3 ) is 25-300% of the height of the blow box ( 7 ) in the travelling direction of the paper web ( 3 ), in the second edge of which wall there has been arranged a boundary layer air doctor ( 15 ), which extends substantially unto the surface of the cylinder ( 4, 5, 6 ), and which wall ( 10 ) has been attached to the blow box ( 7 ) so that the blow box ( 7 ) and the wall ( 10 ) form a space in the area between the opening nip ( 8 ) and the closing nip ( 9 ) following it, into which space an underpressure can be arranged in order to support the paper web ( 3 ) towards the fabric ( 2 ) in the area between said nips ( 8, 9 ).
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