A vacuum apparatus having flow management device for...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/50 (2006.01) D21F 1/52 (2006.01) D21F 2/00 (2006.01) D21F 5/14 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2214251

A papermaking vacuum apparatus having a web-facing surface adapted to support a papermaking belt and comprising a head, a body and at least one vacuumslot disposed in the head and defining an aperture on the web-facing surface. The vacuum slot is in fluid communication with the web-facing surface and extends from the web-facing surface to the body which is in further fluid communication with a vacuum source. The vacuum apparatus has a flow management device facing said web-contacting surface of the papermaking belt and disposed such that the papermaking belt having the paper web thereupon travels between the flow management device and the web-facing surface of the head. The flow management device has an air flow resistance and controls the distribution of the air flow through the aperture on the web-facing surface such as to effectively increase in the machine direction the amount of vacuum pressure applied through the vacuum slot to the papermaking belt.

Appareil de mise sous vide, présentant une surface contre-bande, pour la fabrication du papier. Cette surface est adaptée pour supporter une courroie de fabrication du papier et comprend une tête, un corps et au moins une fente de mise sous vide disposée dans la tête et formant une ouverture sur la surface contre-bande. La fente est en contact fluide avec la surface contre-bande, et se prolonge de cette surface au corps, également en contact fluide avec une source de mise sous vide. L'appareil de mise sous vide est muni d'un dispositif de réglage du débit faisant face à la surface contre-bande de la courroie de fabrication du papier et disposé de façon que la courroie portant la bande continue de papier avance entre le dispositif de réglage du débit et la surface contre-bande de la tête. Le dispositif de réglage démontre une résistance au débit d'air et contrôle la répartition de ce débit par l'ouverture de la surface contre-bande, de façon à augmenter efficacement, en direction de la machine, la quantité de pression par le vide exercée par la fente de mise sous vide sur la courroie de fabrication du papier.

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