Apparatus for drying and smoothing a fibre web

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/00 (2006.01) F26B 13/10 (2006.01)

Patent

CA 2202381

An apparatus for drying and smoothing a fibre web (5) between two tight bands (1, 2) that move in parallel and turn around turning rolls (6a, 6b, 7a, 7b), the first band (1) being heated with hot steam and the second band (2) being cooled with water, and the fibre web (5) being conducted through the drying zone that the bands (1, 2) define together with at least one felt or wire (3, 4) such that the fibre web (5) is in contact with the surface of the first, heated band (1) and that the felt or wire (3, 4) is between the fibre web (5) and the second, cooled band (2). In the invention, the fibre web (5) is smoothed such that the press means located in the vicinity of the first turning rolls (6a, 7a) in the travel direction of the fibre web (5) apply to it a pressure that is essentially higher than the pressure in the other parts of te drying zone. The pressure that the fibre web is subjected to in the drying zone is sufficiently high to prevent the fibre web from shrinking in the longitudinal and transverse directions, and yet sufficiently low to prevent the fibre web from becoming essentially thinner.

Appareil servant à sécher et adoucir une nappe de fibres (5) entre deux bandes tendues (1, 2) se déplaçant en parallèle et tournant autour de rouleaux rotatifs (6a, 6b, 7a, 7b), la première bande (1) étant chauffée à la vapeur, et la deuxième (2) refroidie par de l'eau, et la nappe de fibres (5) étant entraînée à travers la zone de séchage délimitée par les bandes (1, 2) et au moins un feutre ou une toile sans fin (3, 4) de manière à ce que la nappe de fibres (5) soit en contact avec la surface de la première bande chauffée (1) et que le feutre ou la toile sans fin (3, 4) soit pris entre la nappe de fibres (5) et la deuxième bande (2) refroidie. Selon l'invention, la nappe de fibres (5) est adoucie de façon à ce que la presse située à proximité des premiers rouleaux rotatifs (6a, 7a) dans le sens de déplacement de la nappe de fibres (5) applique sur celle-ci une pression sensiblement plus élevée que celle des autres parties de la zone de séchage. La pression appliquée sur la nappe de fibres (5) dans la zone de séchage est suffisamment élevée pour l'empêcher de se rétracter dans le sens longitudinal et transversal et néanmoins suffisamment basse pour l'empêcher de s'amincir sensiblement.

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