Sheet stabilizers with suction nozzle having center protrusion

Details Sheet stabilizers with suction nozzle having center protrusion Sheet stabilizers with suction nozzle having center protrusion

D - Textiles, Paper

21

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D21G 9/00 (2006.01) B65H 23/24 (2006.01) B65H 37/00 (2006.01) D21F 1/36 (2006.01) D21F 7/00 (2006.01) D21F 7/06 (2006.01)

Patent

CA 2705991

A single-sided web stabilizer for stabilizing a continuous moving web for making various web property measurements, The arrangement is characterized by a nozzle having a central structure, which may be a protrusion, surrounded by an annular opening through which air is emitted to generate a suction proximate the nozzle. The nozzle may be a Coanda nozzle, or may generate suction via a vortex flow. Two nozzle arrangements are provided, one sheet-contacting, where the sheet is drawn against the protrusion, and another sheet non-contacting, where an air bearing is provided between the protrusion end surface and the moving web to space the sheet from the protrusion. To provide a central air bearing the protrusion may be provided with an aperture or apertures through which air is expelled.

Cette invention porte sur des buses d'aspiration comportant une saillie centrale pour stabiliser une nappe continue pour diverses mesures de propriétés de la nappe. Les buses d'aspiration soufflent de l'air par la buse et produisent alors un vide à proximité de celles-ci. L'invention concerne deux buses, un stabilisateur de contact avec la feuille à côté unique et un stabilisateur de feuille sans contact. Un palier à air peut être formé entre la surface d'extrémité de la saillie centrale et la nappe en mouvement.

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