Twin fabric forming section blade mounting

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/48 (2006.01)

Patent

CA 2391918

A flexible mounting for use in the forming section of a twin forming fabric papermaking machine comprises a base member supported by the machine structure to which is attached a flexible C-shaped beam, which has a first edge attached to the base member, and a fabric contacting blade attachment means at a second edge. A pressurized loading tube is located within the C-shaped beam between its second edge and the base member. The flexible mounting involves no moving parts in sliding contact. When the pressurized loading tube is loaded, the C-shaped beam flexes thus allowing the blade to move over an arc into contact with a forming fabric. As the pressurized tube is further loaded, the contact face of the blade is moved over the arc into further engagement with the forming fabric. The mounting reduces fabric wear and allows localized flexing to accommodate variations in operative conditions.

L'invention porte sur une monture flexible de la lame dans la section de formation d'une machine à papier à deux toiles comportant essentiellement une embase (1), reposant sur la structure (2) de la machine, à laquelle est fixé une plaque flexible en C (3). L'une (4) des extrémités se la plaque flexible en C (3) est fixée à l'embase (1), et l'autre au support (8) d'une lame (13) en contact avec la toile. Un tube (14) sous pression de mise en charge est placé sous la plaque en C (3) entre l'embase et sa deuxième extrémité. Le tube (14) en se chargeant fait fléchir la plaque (3) et met en un premier temps la lame (13) en contact avec l'une des toiles. Lorsque la charge augmente, la face (22) de contact de la lame (13) contacte plus fortement la toile. Dans une exécution préférée, l'angle d'enveloppement de la toile autour du bord d'attaque de la lame peut être réduit, la monture permet ainsi de diminuer l'usure de la toile passant sur la lame. La monture permet également des flexions de la lame pour tenir compte de variations ponctuelles telles que l'épaisseur de pâte. La monture peut également comprendre des évents (81) d'évacuation en aval de la lame du liquide accumulé en amont de la lame.

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