Web stabilizing device

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/02 (2006.01) B31F 1/12 (2006.01) D21F 7/00 (2006.01) D21G 3/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2245453

A web support foil positioned adjacent to a Yankee dryer above a creping doctor. The foil supports the web as it leaves the dryer. Mounted to the top of the foil is an adjustable air deflector which is positioned tangent to the Yankee dryer. The air deflector blocks air moving along the web. A slotted opening draws air from a leading-edge pocket collecting fibers which are broken loose during the creping action. The web is held against the bottom side of the foil by one or more air jets which are directed over the bottom surface on the foil. The jets of air function as coanda air jets and prevent the web from sticking to the bottom surface of the foil while creating a Bernoulli effect which holds the web against the bottom of the foil.

Racle de support de bande continue placée en position adjacente à un sécheur Yankee au-dessus d'un docteur crêpeur. La racle supporte la bande continue lorsqu'elle sort du sécheur. Un déflecteur d'air réglable est monté sur le dessus de la racle de façon tangentielle par rapport au sécheur Yankee. Le déflecteur d'air bloque l'air qui se déplace le long de la bande continue. Une ouverture à fente tire l'air d'un logement de bord d'attaque en captant des fibres qui se sont décollés pendant les manipulations de crêpage. La bande continue est gardée contre le côté du fond de la racle au moyen d'un ou de plusieurs jets d'air dirigés sur la surface du fond de la racle. Les jets d'air fonctionnent en tant que jets d'air à effet Coanda et empêchent la bande continue de coller à la surface du fond de la racle tout en créant un effet de Bernoulli qui retient la bande continue contre le fond de la racle.

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