| 摘要 |
A blow box 18 for supporting the web run in a paper machine or the like, which blow box comprises members for maintaining a negative pressure at least in one negative pressure region 24 between the wire 20 and the blow box. The members comprise a blocking member 30, 32, which is arranged, regarding the wire's running direction, at the beginning and/or at the end of said negative pressure region, which extends across the wire and projects towards the wire, and which is movable in relation to the blow box, and blowing members 34, 36, with which air is ejected with blows between said blocking member and the wire from said negative pressure region and/or with which air is prevented from entering this negative pressure region. The blocking member is connected to the blow box by a hinge member 40, 42, which allows the blocking member to rotate around the articulation point of the hinge member due to the pressure difference between the pressure acting on the blocking member's blocking surface 30', 32' directed towards the wire and the pressure acting on the blocking member's back surface 50, 50' directed away from the wire.
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