Sheet stabilization with dual opposing cross direction air...

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 23/24 (2006.01) B65H 20/14 (2006.01) D21F 1/42 (2006.01) D21F 7/06 (2006.01) D21G 9/00 (2006.01) G01B 11/06 (2006.01) G01B 21/08 (2006.01) G01D 3/028 (2006.01) G01N 21/85 (2006.01)

Patent

CA 2721583

An air stabilization system employing two parallel, opposite facing Coanda nozzles, that are positioned adjacent a flexible moving web, with each nozzle exhausting gas at opposite directions, subjects the moving web to opposing forces effective to stabilize the web. Each nozzle includes an elongated slot that is parallel to the path of the moving web. The two Coanda nozzles serve as separate points along the machine direction for controlling the height of the moving web. By modulating the flow, pressure and other parameters of gases exiting the Coanda nozzles, the shape of the moving web between the nozzles can be manipulated to present a planar contour for measurements. The air stabilization system can be incorporated into a scanner head to measure the caliper of paper, plastic, and other flexible web products.

Linvention concerne un système de stabilisation pneumatique utilisant deux éjecteurs à effet Coanda parallèles et opposés, qui sont positionnés de manière adjacente par rapport à une toile mobile flexible, chaque éjecteur laissant séchapper du gaz dans des directions opposées. Le système soumet la toile mobile à des forces dopposition efficaces pour stabiliser la toile. Chaque éjecteur comprend une fente allongée qui est parallèle au chemin de la toile mobile. Les deux éjecteurs Coanda servent de points séparés, le long de la direction machine pour contrôler la hauteur de la toile mobile. En modulant le flux, la pression et les autres paramètres des gaz sortant des éjecteurs Coanda, la forme de la toile mobile entre les éjecteurs peut être manipulée pour présenter un contour plan pour des mesures. Le système de stabilisation pneumatique peut être incorporé dans une tête de balayage pour mesurer lépaisseur du papier, du plastique et dautres produits en toile flexible.

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