Method for forming web from aerosuspension of fibrous material

Details Method for forming web from aerosuspension of fibrous material Method for forming web from aerosuspension of fibrous material

D - Textiles, Paper

21

F

D21F 9/00 (2006.01)

Patent

CA 2350129

A process for forming a web by aerodynamic method comprises feeding an aerosuspension onto a moving forming wire positioned at an inclination angle .alpha. relative to the aerosuspension flow and removing an air component of the above aerosuspension by means of a suction device located on a backside of the wire, with the incline angle .alpha. being selected by the equation arcctg(Vw/Vf + ~~) < .alpha. < arcctg(Vw/Vf - ~~), where: Vw - velocity of forming wire; Vf - air filtration rate through a layer of formed web and wire provided by a suction device at a steady stationary airflow from the aerosuspension into the suction device. As a result, a possible shear of the formed web caused by the aerodynamic pressure of aerosuspension flow is prevented, which permits production of paper having a high degree of uniformity.

L'invention concerne un procédé de production d'une bande, reposant sur le principe de l'aérodynamisme, et consistant à alimenter en matériau fibreux en suspension une toile de formation mobile positionnée à un angle d'inclinaison .alpha. relatif au flux dudit matériau en suspension, à éliminer l'air dudit flux en suspension au moyen d'un dispositif d'aspiration situé à l'envers de la toile de formation, l'angle d'inclinaison .alpha. étant choisi au moyen de l'équation arcctg(V¿w?/V¿f? + ~~) < arcctg (V¿w? / V¿f? - ~~), où V¿w? - est la vitesse de la toile de formation et V¿f? - est le taux de filtration de l'air passant à travers une couche de la bande produite et la toile de formation grâce à un dispositif d'aspiration aspirant un flux régulier d'air fixe du flux du matériau en suspension.Un éventuel cisaillement de la bande produite est par conséquent évité, ce qui permet de produire un papier très homogène.

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