Approach flow system

D - Textiles – Paper – 21 – D

Patent

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Details

D21D 5/26 (2006.01) D21F 1/66 (2006.01)

Patent

CA 2761661

The invention relates to an assembly for feeding a fibrous suspension (1) to at least one headbox (8) of a paper or board machine having at least one dilution device (5), in which the fibrous suspension (1) is produced by mixing a thick stock suspension (6) with a dilution liquid, wherein the dilution liquid is formed at least partly from white water (2) from the paper or board machine, the white water (2) is pre-degassed in at least one open channel (3) and is then led into a dilution device (5) via an degassing apparatus (4). Here, the effort is to be reduced by the potential energy of the fibrous suspension (1) in the channel (3) not lying above the potential energy of the fibrous suspension (1) in the dilution device (5) and the pressure at the outlet from the degassing apparatus (4) lying between -0.3 and 1 bar, or by the potential energy of the fibrous suspension (1) in the channel (3) lying above the potential energy of the fibrous suspension (1) in the dilution device (5).

L'invention concerne un système d'amenée d'une suspension de matière fibreuse (1) à une ou plusieurs caisses d'arrivée (8) d'une machine à papier ou à carton comprenant au moins un dispositif de dilution (5) dans lequel la suspension de matière fibreuse (1) est produite par mélange d'une suspension de liquide épais (6) à un liquide de dilution, le liquide de dilution étant au moins en partie formé par l'eau blanche (2) de la machine à papier ou à carton, l'eau blanche (2) étant préalablement dégazée dans au moins une goulotte ouverte (3) puis guidée dans un dispositif de dilution (5) en passant par un dispositif de dégazage (4). Cela devrait permettre de diminuer les charges, du fait que l'énergie potentielle de la suspension de matière fibreuse (1) dans la goulotte (3) n'est pas supérieure à l'énergie potentielle de la suspension de matière fibreuse (1) dans le dispositif de dilution (5) et que la pression à la sortie du dispositif de dégazage (4) se situe entre -0,3 et 1 bar ou que l'énergie potentielle de la suspension de matière fibreuse (1) dans la goulotte (3) est supérieure à l'énergie potentielle de la suspension de matière fibreuse (1) dans le dispositif de dilution (5).

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