Screen pipe for dry forming web material

Details Screen pipe for dry forming web material Screen pipe for dry forming web material

B - Operations, Transporting

27

N

B27N 1/00 (2006.01) B27N 3/14 (2006.01)

Patent

CA 2374914

The invention relates to a screen pipe to be used in dry forming of web material in order to distribute fiber material blown into the screen pipe through a jacket (2) of the pipe onto a wire arranged to move under the pipe. The fiber material provided inside the screen pipe is made to move for example by means of a spiked roll placed inside the pipe, so that the movement of the fiber material has both a radial and a tangential component with respect to the jacket (2) of the screen pipe. The jacket comprises on its inner surface profiled grooves (8) in the pipe's axial direction. The edge (8a) of the profiled groove is situated downstream with respect to the tangential component of the fiber flow. The upstream edge (8b) of the groove is positioned downstream with respect to the tangential component of the fiber flow. The bottoms of the profiled grooves comprise holes or slots (9) through which the fibers are discharged from the screen pipe. In the invention, the downstream edge (8a) of the profiled grooves is at a more acute angle to the tangential component of the fiber material flow than the upstream edge (8b).

L'invention concerne un tube filtre servant à former à sec un matériau en bande afin de distribuer une matière fibreuse soufflée à l'intérieur du tube filtre, à travers une gaine (2) du tube, sur un câble conçu pour se déplacer sous le tube. La matière fibreuse disposée à l'intérieur du tube filtre est déplacée, par exemple, au moyen d'un hérisson placé à l'intérieur du tube, de sorte que le mouvement de la matière fibreuse présente à la fois un élément radial et un élément tangentiel par rapport à la gaine (2) du tube filtre. La gaine comprend, sur sa face intérieure, des rainures profilées (8) creusées dans la direction axiale du tube. Le bord aval (8a) de la rainure profilée est située en aval de l'élément tangentiel du flux fibreux. Le bord amont (8b) de la rainure est située en amont de l'élément tangentiel du flux fibreux. Les parties inférieures des rainures profilées comportent des orifices ou des fentes (9) à travers lesquels les fibres sont déchargées du tube filtre. Selon l'invention, le bord aval (8a) des rainures profilées est disposé selon un angle plus aigu par rapport à l'élément tangentiel du flux fibreux que le bord amont (8b).

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