Double-wire former for a paper-making machine

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 9/00 (2006.01)

Patent

CA 2150032

A two-wire gap former for producing a web of fibrous material, in particular a paper web, includes a first and second wires defining a twin-wire former; a headbox for injecting pulp directly between the two wires; and at least one dewatering zone having a curved, non-rotary, pervious surface. A convex dewatering element disposed at the point of impact of the jet of pulp is provided at the beginning of the first dewatering zone with respect to the advance direction of the machine, and has at least two radii of curvature R i in contact with the wire. Both radii of curvature R i are smaller than the radius of curvature R i+1 that is disposed downstream with respect to the machine advance direction.

Un former à deux toiles pour la fabrication d'une bande de matières fibreuses, notamment d'une bande de papier, se présente sous la forme d'un former à vide avec les caractéristiques suivantes: des première (1) et deuxième (2) toiles forment ensemble une double toile; une caisse de tête injecte la suspension de pâte (3) directement entre les deux toiles; au moins une première zone de séchage est constituée d'une surface (6) courbe, vue dans le sens d'avancement, non rotative et interrompue, par exemple un patin de formage ou plusieurs barres qui forment ensemble une surface. L'invention se caractérise par le trait suivant: un élément de séchage (6) convexe qui commence directement au point d'impact du jet de pâte est situé au début de la première zone de séchage. Vu dans le sens d'avancement, cet élément de séchage (6) comprend au moins deux rayons de courbure Ri en contact avec les toiles. Les rayons de courbure Ri sont tous les deux inférieurs au rayon de courbure Ri+1 qui les suit dans le sens d'avancement.

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