Blow box for controlling the web run

Details Blow box for controlling the web run Blow box for controlling the web run

2005-02-01

2005-02-01

Gravini, Stephen (Department: 3749)

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

C034S119000, C034S125000

Reexamination Certificate

active

06848195

ABSTRACT:
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.

REFERENCES:
patent: 4669198 (1987-06-01), Wedel
patent: 4905380 (1990-03-01), Eskelinen et al.
patent: 5037509 (1991-08-01), Wedel
patent: 5341579 (1994-08-01), Schiel et al.
patent: 5792318 (1998-08-01), Mancini
patent: 6032385 (2000-03-01), Bischel et al.
patent: 6247247 (2001-06-01), Yomaa et al.
patent: 6317999 (2001-11-01), Virta et al.
patent: 110624 (2003-02-01), None
patent: WO 0050692 (2000-08-01), None

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