Apparatus for a non-contacting directional control of a web

Claim 2

Apparatus for non-contacting guiding of a moving weB through a treating space comprising at least one blow box for receiving a treating fluid; a nozzle extending throughout the width of the web and being connected to the blow box for blowing the treated fluid against the web, said nozzle having a nozzle-forming wall comprising an extension in the form of a nozzle lip which forms a guiding surface for the treating fluid and has an airfoil-shaped outline; an exhaust space defined by the web and laterally of said nozzle wall into which the treating fluid supplied to the web passes; an exhaust conduit communicating with said exhaust space for exhausting said treating fluid therefrom; and throttling means comprising a throttling wall extending through said exhaust space transversely to the direction of flow of the treating fluid to be exhausted and having apertures for throttling said treating fluid, said throttling wall being substantially parallel to said nozzle lip.

Claim 3

Apparatus for non-contacting guiding of a moving web through a treating space comprising a plurality of adjacent blow boxes for receiving treating fluid; a plurality of nozzles extending through the width of the web and respectively connected to said blow boxes for blowing a treating fluid against the web, each of said nozzles having a nozzle-forming wall comprising an extension in the form of a nozzle lip which forms a guiding surface for the treating fluid and has an airfoil-shaped outline; an exhaust space into which the treating fluid supplied to the web passes and being defined by the web and nozzle walls of nozzles on adjacent nozzle boxes; an exhaust conduit communicating with said exhaust space for exhausting said treating fluid therefrom; and throttling means comprising a throttling wall extending through the exhaust space transversely to the direction of flow of the treating fluid to be exhausted and having apertures for throttling the treating fluid, said throttling wall being substantially parallel to the nozzle lips on adjacent nozzles.

Claim 4

Apparatus for non-contacting guiding of a moving web through a treating space comprising a plurality of adjacent blow boxes for receiving treating fluid; a plurality of nozzles extending through the width of the web and respectively connected to said blow boxes for blowing a treating fluid against the web, each of said nozzles having a nozzle-forming wall comprising an extension in the form of a nozzle lip which forms a guiding surface for the treating fluid and has an airfoil-shaped outline; an exhaust space into which the treating fluid supplied to the web passes and being defined by the web and nozzle walls of nozzles on adjacent nozzle boxes; an exhaust conduit communicating with said exhaust space for exhausting said treating fluid therefrom; and throttling means comprising a throttling wall extending through the exhaust space transversely to the direction of flow of the treating fluid to be exhausted and having apertures for throttling the treating fluid, said throttling wall being substantially parallel to the nozzle lips on adjacent nozzles.

Claim 5

Apparatus as defined in claim 2, wherein said apertures in said throttling wall comprise nozzles.

Claim 6

Apparatus as defined in claim 2, wherein said throttling wall consists of a connection between facing walls of two nozzles succeeding in the direction of movement of the web.

Claim 7

Apparatus as defined in claim 2, wherein said nozzle boxes, said nozzles, said nozzle lips and said throttling wall are mirror symmetrically arranged with regard to a plane of symmetry between adjacent nozzles.

Claim 8

Apparatus as defined in claim 2, wherein each of the nozzle lips has a convexly curved surface facing the web and a thin edge at the free end thereof.