D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/00 (2006.01) D21F 1/32 (2006.01) D21F 1/50 (2006.01) D21F 1/52 (2006.01)
Patent
CA 2686721
Apparatus for applying overpressure to a moving web path (3, 16, 17), comprising at least: a surface (1a, 2a) against which the web path is pressed by the effect of negative pressure; a pressure box (19) which is placed on the opposite side of the web path with respect to said surface (1a, 2a) and through which the overpressure is effective on the web path travelling past said surface (1a, 2a), The pressure box comprises at least an overpressure chamber (22) restricting the overpressure area (24) subjected to the overpressure, wherein the overpressure chamber has the shape of a tapering or narrowing throat (23), having an air gap (28) between its narrow end and the web path and a channel (29) at its wide end, via which channel air is capable of being discharged from the overpressure chamber. In one example the pressure box (19) also comprises at least one overflow chamber (30) restricting the area (X2) subjected to the pressure of the overflow chamber, wherein both said channel (29) and said air gap (28) lead from said overpressure chamber to the overflow chamber.
L'invention concerne un appareil pour appliquer une surpression à une trajectoire de bande mobile (3, 16, 17). L'appareil comporte au moins : une surface (1a, 2a) contre laquelle la trajectoire de bande est pressée par pression négative; une boîte de pression (19) placée sur le côté opposé de la trajectoire de bande par rapport à ladite surface (1a, 2a) et à travers laquelle la surpression est effective sur la trajectoire de bande se déplaçant après ladite surface (1a, 2a). La boîte de pression comporte au moins une chambre de surpression (22) limitant la zone de surpression (24) soumise à la surpression et ayant la forme d'une gorge (23) effilée ou se rétrécissant et entre l'extrémité étroite et la trajectoire de bande de laquelle se trouve un espace d'air (28) par l'intermédiaire duquel de l'air peut être déchargé de la chambre de surpression. Dans un exemple, la boîte de pression (19) comprend également au moins une chambre de débordement (30) limitant la zone (X2) soumise à la pression de la chambre de débordement, ledit canal (29) et ledit espace d'air (28) conduisant de ladite chambre de surpression à la chambre de débordement.
Savolainen Olavi
Borden Ladner Gervais Llp
Effcom Oy
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