Arrangement in a dryer for a fibre web
AssigneeValmet-Tampella Oy
InventorsPaavo Rautakorpi, Jari Ilomaki, Jukka Lehtinen
Life of this patent
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Abstract
An arrangement in a dryer for a fibre web for sealing bands (5a, 5b) that move between a chamber (3) containing pressurized vapor and a chamber (1) containing pressurized water and transport a web (7) and a felt (8) between them, and also for sealing the edges of the chambers (1, 3). The arrangement comprises a closed recovery chamber (16) into which the edges of the bands (5a, 5b) extend and in which the vapor escaping from the vapor chamber (3) from between the band (5a) and the seals (9, 10) and the water escaping from the water chamber (1) from between the band (5b) and the seals (12, 13) gather, whereby the vapor and water can be discharged from the recovery chamber (16) such that they are cannot escape into surrounding air.
Claims10
An arrangement in a dryer for a fibre web, the arrangement comprising:
- two bodies (1a, 3a) for defining lower and upper chambers (1, 3) respectively for containing a pressurized medium that is a vapour in the upper chamber (3);
- two impermeable bands (5a, 5b) travelling next to edges of the chambers (1, 3) and forming an endless loop, each band providing one wall for a respective one of the chambers (1, 3), a fibre web (7) and wire (8) travelling between the bands (5a, 5b);
- at least one sealing member (12, 13) between the edge of the body (1a) of the lower chamber (1) and the band (5b) next to it for sealing between the moving band (5b) and the body (1a) of the lower chamber (1);
- and
- on at least one of sides of the chambers (1, 3), recovery chambers (16) into which edges of the bands (5a, 5b) extend and which are isolated from the surrounding air and the chambers (1, 3) for pressurized medium that is discharged from both of the chambers (1, 3) from between the bodies (1a, 3a) and the bands (5a, 5b) to gather in and be dischargeable therefrom through outlet conduits (17).
Dependencies are inferred from the claim text.