Method and apparatus for freely suspending moving webs of material
First Claim
1. A method for freely suspending a moving web of material in a gaseous medium, which comprises impinging, by means of a stable emitting system, a stream of gaseous medium onto the surface of the web from one side only in order to produce at least one stationary stable pressure zone, in which a repelling force decreases continually with an increasing distance from the emitting system,forming at least one stationary stable suction zone adjacent said stationary pressure zone, in which a suction force decreases continually with an increasing distance from means forming the suction zone to a smaller degree than the repelling force in the pressure zone,and regulating the applied stable pressure of the stable emitting system and the suction of the stable suction zone in order to make the repelling force equal to the suction force at the zone where the web is freely suspended between the emitting system and the means forming the suction zone.
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Abstract
This invention relates to a method for freely suspending a moving web of material in a gaseous medium, which comprises impinging a stream of the gaseous medium over the entire width of one surface of the web in order to produce a first stationary stable pressure zone, forming at least one stationary stable suction zone adjacent said first stationary stable pressure zone, deflecting the gaseous medium passing beyond the edges of the web in order to produce a second stationary stable pressure zone on the opposite side of the web, and regulating said pressure and suction zones in order to maintain the web in a freely suspended state. The invention also includes an apparatus for performing the method.
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Citations
29 Claims
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1. A method for freely suspending a moving web of material in a gaseous medium, which comprises impinging, by means of a stable emitting system, a stream of gaseous medium onto the surface of the web from one side only in order to produce at least one stationary stable pressure zone, in which a repelling force decreases continually with an increasing distance from the emitting system,
forming at least one stationary stable suction zone adjacent said stationary pressure zone, in which a suction force decreases continually with an increasing distance from means forming the suction zone to a smaller degree than the repelling force in the pressure zone, and regulating the applied stable pressure of the stable emitting system and the suction of the stable suction zone in order to make the repelling force equal to the suction force at the zone where the web is freely suspended between the emitting system and the means forming the suction zone.
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10. A method for freely suspending a moving web of material in a gaseous medium, which comprises impinging, by means of a stable emitting system, a stream of the gaseous medium over the entire width of one surface of the web in order to produce a first stationary stable pressure zone, in which a repelling force decreases continually with an increasing distance from the emitting system,
forming at least one stationary stable suction zone adjacent said first stationary stable pressure zone, in which a suction force decreases continually with an increasing distance from means forming the suction zone, deflecting the gaseous medium passing beyond the edges of the web in order to produce a second stationary stable pressure zone on the opposite side of the web, in which a repelling force on said opposite side decreases continually with an increasing distance from means forming the second pressure zone, and regulating said pressure and suction zones in order to maintain the web in a freely suspended state.
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15. An apparatus for freely suspending a moving web of material in a gaseous medium which comprises housing means, transverse jet means of stable characteristic curve in said housing means and having a length greater than the width of a web passed through said housing means, said transverse jet means exercising a repelling force on the web which decreases continually with an increasing distance between said jet means,
suction means mounted adjacent said jet means, said suction means including means enabling transverse suction and substantially perpendicular suction over the material web, said suction means producing a suction force which decreases continually with an increasing distance from the suction means to a smaller degree than the repelling force decreases continually depending on the distance between the web and the jet means, whereby the repelling force is equal to the suction force at the zone where the web is freely suspended between the jet means and the suction means, and stable receiving means mounted opposite said jet means whereby the dynamic excess of said gaseous medium flowing over the edges of the web is collected and turned around, said receiving means exercising a repelling force on the web which decreases continually with an increasing distance to the receiving means.
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29. An apparatus for freely suspending and moving a web of material in a gaseous medium which comprises housing means, at least one transverse jet means of stable characteristic curve in said housing means mounted on one side only relative to the moving web and having a length no greater than the width of a web passed through said housing means, said jet means exercising a repelling force on the web which decreases continually with an increasing distance between the web and the jet means, and suction means mounted adjacent said jet means for producing a stable suction zone, said suction means producing a suction force which decreases continually with an increasing distance from the suction means to a smaller degree than the repelling force decreases depending on the distance between the web and the jet means, whereby the repelling force is equal to the suction force at the zone where the web is freely suspended between the jet means and the suction means.
Specification