A vacuum apparatus having textured web-facing surface for...

Details A vacuum apparatus having textured web-facing surface for... A vacuum apparatus having textured web-facing surface for...

D - Textiles, Paper

21

F

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 2214235

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 web-facing surface comprises a textured area in the region ofthe web-facing surface juxtaposed with the aperture defined by the vacuum slot. This textured area creates a leakage of at least about 35 Marlatts at a pressuredifferential of 7 inches of Mercury. This leakage eliminates the vacuum seal between a smooth backside of the papermaking belt and the web-facing surface of the vacuum apparatus.

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. La surface contre-bande comprend une zone texturée dans la partie juxtaposée à l'ouverture formée par la fente de mise sous vide. Cette zone texturée crée une fuite d'au moins 35 Marlatts selon un manomètre différentiel de 7 po de mercure. La fuite élimine le vide entre l'envers lisse de la courroie et la surface contre-bande de l'appareil de mise sous vide.

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