Pneumatic conveying method for flexible webs
First Claim
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1. A method for conveying a web of thin flexible material from a first location to a second location along a predetermined plane and direction of web movement comprising the steps of:
- along the outer edges of said web and under said web, introducing pressurized air at spaced outer positions extending along outer parallel lines between said first and second locations;
substantially simultaneously with the step of introducing pressurized air at said spaced outer positions, introducing pressurized air along the central portion of said web and under the web at spaced inner positions extending along inner parallel lines between said first and second locations;
initially directing the pressurized air from said spaced inner and outer positions in a direction generally parallel to the plane of web movement and at a predetermined first angle relative to the direction of web movement; and
redirecting a portion of said pressurized air in a direction diverging from said plane of movement at a second angle due to the Coanda effect, said angle being defined by the plane of movement and a flow attachment surface, the first angle at said outer positions being greater than the first angle at said inner positions and the second angle at said outer positions being greater than the second angle at said inner positions.
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Abstract
A method for conveying a web using inner and outer pairs of elongated side jet nozzles employing the Coanda effect to propel the web while preventing undue distortion or folding thereof. Conveying is accomplished by flowing pressurized air through a plurality of apertures formed in the nozzles and attaching air flow to Coanda flow attachment surfaces slanting away from the apertures.
35 Citations
8 Claims
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1. A method for conveying a web of thin flexible material from a first location to a second location along a predetermined plane and direction of web movement comprising the steps of:
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along the outer edges of said web and under said web, introducing pressurized air at spaced outer positions extending along outer parallel lines between said first and second locations; substantially simultaneously with the step of introducing pressurized air at said spaced outer positions, introducing pressurized air along the central portion of said web and under the web at spaced inner positions extending along inner parallel lines between said first and second locations; initially directing the pressurized air from said spaced inner and outer positions in a direction generally parallel to the plane of web movement and at a predetermined first angle relative to the direction of web movement; and redirecting a portion of said pressurized air in a direction diverging from said plane of movement at a second angle due to the Coanda effect, said angle being defined by the plane of movement and a flow attachment surface, the first angle at said outer positions being greater than the first angle at said inner positions and the second angle at said outer positions being greater than the second angle at said inner positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification