Equipment and method in a twin-wire former

Details Equipment and method in a twin-wire former Equipment and method in a twin-wire former

D - Textiles, Paper

21

F

D21F 1/00 (2006.01) D21F 9/00 (2006.01)

Patent

CA 2346909

The invention concerns an equipment and a method in a twin-wire former, in which a partly pre-drained or non-drained fibre stock is passed to between the forming wires of the web former in the vicinity of the former roll (11) or of a water drain box, in which connection water is drained out of the stock web by means of the former roll (11) or the water drain box. The twin-wire former comprises a rib (20) in connection with the former roll (11) or the water drain box in the lateral area of the wires (H2), which rib has been fitted to control the running of the second forming wire (H2) passed from the gap roll. By means of the rib (20), in the lateral area of the wire runs, the point at which said forming wire (H2) reaches contact with the first forming wire in connection with the former roll (11) or the water drain box is shifted further away in the machine direction. The rib (20) is an oblong structure, which has a maximal height (Hmax) in the middle area of the rib (20).

L'invention concerne un équipement et un procédé utilisés dans un formeur à toile double, une suspension de pâte fibreuse partiellement pré-égouttée ou non égouttée passant entre les toiles de formage du formeur de bande, situé à proximité du rouleau de formeur (11) ou d'un caisson d'égouttage, dans lequel l'eau résiduelle est drainée de la bande formée à partir de la suspension de pâte, à l'aide du rouleau (11) de formeur ou du caisson d'égouttage. Le formeur à toile double comprend une nervure (20) reliée au rouleau (11) de formeur ou au caisson d'égouttage se trouvant dans la zone latérale des toiles (H¿1? et H¿2?), laquelle rainure a été conçue afin de commander le déplacement de la seconde toile (H¿2?) de formage introduite dans le rouleau d'espacement. Grâce à la nervure (20) se trouvant dans la zone latérale des déplacements de la toile, le point auquel la seconde toile de formage (H2) entre en contact avec la première toile de formage, en relation avec le rouleau (11) de formeur ou la caisse d'égouttage d'eau, est décalé davantage dans le sens de la machine. La nervure (20) présente une structure oblongue qui possède une hauteur maximum (H¿max?) dans la zone médiane de ladite nervure (20).

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