Arrangement in the wet end of a paper machine

Details Arrangement in the wet end of a paper machine Arrangement in the wet end of a paper machine

2005-09-13

2005-09-13

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

C162S301000, C162S300000, C162S363000, C162S264000, C162S203000

Reexamination Certificate

active

06942760

ABSTRACT:
At the end of the twin wire zone of a paper machine former, a suction box (17) inside the upper wire loop (11) has a curved lid (17′) opposite a roll (18) within the lower wire loop (10). The lid is curved in a run situation so the tension of the upper wire (11) reduces the normal force between the wire (11) and the lid (17′) caused by the underpressure of the suction box. The underpressure keeps the web mainly off from the roll (18) and the lower wire (10) while being adhered to the underside of the upper wire (11) and conforming to the curved shape of the lids. Members (17a, 18′) are provided for making the web follow the lower wire (10) in a break situation for conducting it to the broke handling system.

REFERENCES:
patent: 3941651 (1976-03-01), Koski
patent: 4081320 (1978-03-01), Wahren et al.
patent: 4116763 (1978-09-01), Stotz et al.
patent: 5736011 (1998-04-01), Kade et al.
patent: 6322668 (2001-11-01), Snellman et al.
patent: 2550071 (1976-06-01), None
patent: 965277 (1996-12-01), None
patent: WO 98/29600 (1998-07-01), None
patent: WO 01/31120 (2001-05-01), None

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