Method and apparatus for web threading in a drying section...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 7/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2427000

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 p1 at 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 p1 in the underpressure region.

L'invention concerne un procédé et un appareil d'engagement de bande dans une section de séchage de machine à papier ou analogue. Une amorce (24) et une bande descendante sont formées par découpe de ladite bande entrant dans le cylindre de séchage de la section de séchage. Un caisson (12) à pression réduite est agencé au niveau d'un vide d'ouverture situé entre le cylindre de séchage (14) et la toile de séchage, du côté toile éloigné de la bande, de sorte que ledit caisson peut diriger une pression réduite sur la bande, cette pression pouvant être qui régulée dans le sens travers de la machine. Le caisson à pression réduite crée une région de pression réduite (34') entre l'amorce et ledit caisson, cette région possédant une pression p1 au niveau d'un point de détachement, c'est-à-dire dans la zone dans laquelle la toile est détachée du cylindre de séchage (14), laquelle pression réduite est suffisante pour détacher l'amorce du cylindre de séchage (14). Une zone de protection est créée entre la région de pression réduite au niveau de l'amorce et de la bande descendante, ladite zone comprenant une barrière (46) destinée à maintenir la pression p1 dans la région de sous pression.

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