Paper making and fiber liberation – Processes and products – Lead strip forming and/or guiding
Reexamination Certificate
2005-07-12
2005-07-12
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes and products
Lead strip forming and/or guiding
C162S194000, C162S286000, C162S366000, C162S375000, C034S117000, C034S120000, C226S092000
Reexamination Certificate
active
06916404
ABSTRACT:
A method and an apparatus for web threading in a drying section of a paper machine or the like. A leader (24) and a so called run-down strip are formed by cutting in the web coming to the drying cylinder in the drying section. An underpressure box (18) is arranged at the opening gap between the drying cylinder (14) and the drying wire, on that side of the wire which is away from the web, whereby this box can direct against the web an underpressure which is controllable in the machine's cross direction. The underpressure box creates an underpressure region (34′) between the leader and the underpressure box, the region having an underpressure p1at the detachment point, i.e. in the area where the wire is detached from said drying cylinder (14), which underpressure is sufficient to detach the leader from said drying cylinder. A protection zone is created between the underpressure region created at the leader and the run-down strip, which protection zone has a barrier (46) in order to maintain the underpressure p1in the underpressure region.
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Jokinen Reijo
Juppi Kari
Komulainen Antti
Kurki Matti
Laapotti Jorma
Hug Eric
Metso Paper Inc.
Oliff & Berridg,e PLC
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