Two-wire web-forming section of a paper machine

D - Textiles – Paper – 21 – F

Patent

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Details

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

Patent

CA 2091778

A two-wire web-forming section for a paper machine includes two wire loops, consisting of a first wire (1) and a second wire (2), water draining therethrough from a web (W) to be formed in two directions within a two-wire dewatering zone established by the wires. A breast roll (4) guiding first wire (1) is open and a constricted slice jet (S) comes into contact with first wire (1) within the contact area of open roll (4) and with second wire (2) downstream of breast roll (5) guiding it. The distance (1) of wire (1) lying on open breast roll (4) at the diverging point of the first wire and breast roll (4) from said second wire (2) lying straight between its own breast roll (5) and the guide element (6) guiding the wires together is less, preferably 1-4 mm less than the thickness of the constricted slice jet (S).

Une partie à deux toiles formant la bande pour une machine à papier comprend des boucles à deux toiles composées d'une première toile (1) ainsi que d'une seconde toile (2), de l'eau s'y écoulant à partir d'une toile (W) pour être formée dans deux sens à l'intérieur d'une zone d'égouttage à deux toiles établie par lesdites toiles. Un rouleau de tête (4) guidant une première toile (1) est ouvert et un jet (S) resserré de découpage en tranche vient au contact de la première toile (1) à l'intérieur de la zone de contact du rouleau ouvert (4) et au contact de la seconde toile (2) en aval du rouleau de tête (5) le guidant. La distance (L) entre la toile (1) reposant sur le rouleau de tête ouvert (4) au point divergent de la premiere toile et le rouleau de tête (4) à partir de ladite seconde toile (2) reposant en ligne droite entre son propre rouleau de tête (5) et l'élément de guidage (6) guidant les toiles ensemble est de préférence inférieure de 1 à 4 mm à l'épaisseur du jet (S) resserré de découpage en tranche.

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