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AssigneeValmet Paper Machinery Inc.
InventorsPekka Eskelinen, Timo Haverinen
Estimating the term…
The multi-cylinder dryer of a papermachine includes a first tier of cylinders, where the web supported by a first dryer wire travels on the cylinders of the first tier of cylinders, as well as a second tier of cylinders, where the web supported by a second dryer wire travels on the cylinders of the second tier of cylinders. The first dryer wire travels from a cylinder of the first tier of cylinders to a first guide roll and delivers the web lying on its side facing the cylinder of the first tier onto the second dryer wire and, after having wound onto a second wire guide roll, again takes up, on its surface facing the following cylinder of the first tier, the web from the second dryer wire traveling through the second tier of cylinders. A section extending between the dryer cylinder and the first wire guide roll is provided on the web-free side of the wire with a nozzle for blowing air in the traveling direction of the wire into a gap between the wire and the first wire guide roll for producing a plenum zone facilitating the release of the web.
A method for ensuring the run of the web in the multi-cylinder dryer of a papermachine, including a first tier of cylinders where the web travels supported by a first dryer wire on the cylinders of said first tier of cylinders, and a second tier of cylinders where the web travels supported by a second dryer wire on the cylinders of said second tier of cylinders, said first dryer wire traveling between one cylinder and the following cylinder of the first tier of cylinders by advancing from the cylinder of said first tier to a first wire guide roll, whereby, over a first section which commences at the first separation point of the first dryer wire from the cylinder of said first tier and ends at the second wire separation point from the first wire guide roll, it delivers the web carried on its side facing the cylinder of the first tier over to said second dryer wire and, after the following section free from web, said first dryer wire winds around a second wire guide roll onto the following cylinder of the first tier, whereby, over a second section which commences at the arrival point of the first dryer wire on said second wire guide roll and ends at the arrival point of the first dryer wire on said following cylinder of the first tier, it takes up said web again, on its surface facing said cylinder of said first tier, from said second dryer wire traveling through the second tier of the cylinders, wherein a third section between the cylinder of said first tier and the first wire guide roll is provided with a first nozzle on the web-free side of the first dryer wire for blowing air in the traveling direction of the first dryer wire into a gap between the first dryer wire and the first wire guide roll for producing a plenum zone (n+) facilitating the release of the web.
A device for ensuring the run of the web in the multi-cylinder dryer of a papermachine, comprising a first tier of cylinders having a first dryer wire for supporting the web at and between the cylinders of said first tier of cylinders, and a second tier of cylinders having a second dryer wire for supporting said web at and between the cylinders of said second tier of cylinders, whereby, between one cylinder of the first tier and the following cylinder of the first tier of cylinders, said first dryer wire is passed around a first and second wire guide roll in a manner such that the web run between the cylinder of the first tier and the first wire guide roll includes a first section within which said web travels on the wire surface facing the cylinder of the first tier and which includes the release point of the web from the first dryer wire for its transfer onto the second dryer wire traveling on the cylinders of the second tier of cylinders, and a loop formed by the first dryer wire between said one cylinder and the following cylinder of the first tier of cylinders includes a second wire guide roll, around which said first dryer wire is passed to the following cylinder of the first tier, whereby a second section which commences at the wire arrival point on said second wire guide roll and ends at the arrival point of the first dryer wire on the cylinder of the first tier, includes the take-up point of the web onto the first dryer wire from said second dryer wire, wherein a third section extending between the dryer cylinder of the first tier and said first wire guide roll is provided on the side of the first dryer wire free from the web with air blow means, comprising a first nozzle directed in the wire traveling direction for releasing the web from the first dryer wire.
Dependencies are inferred from the claim text.