Web drying roll
First Claim
1. In a hollow cylindrical dryer drum having an outer shell and mounted for rotation for drying contact with a traveling fibrous web, the combination comprising:
- means connected to the drum for directing a flow of steam into the interior of the drum for heating the peripheral outer surface of the shell;
a condensate removal means within the drum for removing condensate from the inner surface of the periphery of the shell;
a bristle support within the drum extending axially along the inner periphery having a plurality of cantileverly supported bristles extending radially outwardly into close running contact with the inner peripheral shell surface and substantially uniformly distributed along the axial length;
said bristles having sufficient stiffness for resisting the movement of condensate with rotation of the drum and generating a visual high level of turbulence in the condensate decreasing the rotational speed of the layer of condensate carried with the drum shell causing the layer of rimming condensate to collapse for a substantial increase in heat transfer from the steam to the drum shell;
and means for stationarily mounting said bristle support within the drum.
1 Assignment
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Accused Products
Abstract
A method and apparatus for drying a traveling fibrous web such as paper including a hollow cylindrical dryer drum with means for directing a flow of steam into the drum and for removing condensate from the inside of the drum and positioning an axially elongate bristle support with bristles projecting radially outwardly so that the support and bristles form a brush of substantial uniform axial density to generate a visual high level of turbulence in the condensate and decrease the rotational speed of the layer of rimming condensate formed on the inner surface of the drum shell.
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Citations
10 Claims
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1. In a hollow cylindrical dryer drum having an outer shell and mounted for rotation for drying contact with a traveling fibrous web, the combination comprising:
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means connected to the drum for directing a flow of steam into the interior of the drum for heating the peripheral outer surface of the shell; a condensate removal means within the drum for removing condensate from the inner surface of the periphery of the shell; a bristle support within the drum extending axially along the inner periphery having a plurality of cantileverly supported bristles extending radially outwardly into close running contact with the inner peripheral shell surface and substantially uniformly distributed along the axial length;
said bristles having sufficient stiffness for resisting the movement of condensate with rotation of the drum and generating a visual high level of turbulence in the condensate decreasing the rotational speed of the layer of condensate carried with the drum shell causing the layer of rimming condensate to collapse for a substantial increase in heat transfer from the steam to the drum shell;and means for stationarily mounting said bristle support within the drum.
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2. In a hollow cylindrical dryer drum having an outer shell and mounted for rotation for drying contact with a traveling fibrous web, the combination comprising:
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means connected to the drum for directing a flow of steam into the interior of the drum for heating the peripheral outer surface of the shell; a condensate removal means within the drum for removing condensate from the inner surface of the shell periphery; and a plurality of flexible members nonrotationally positioned adjacent the inner periphery of the shell at a predetermined circumferential location and engaging the rotating condensate generating a turbulence in the condensate layer on the inner periphery of the drum shell causing the condensate layer to collapse for substantially increasing heat transfer without decreasing the quantity of condensate by said engagement with the condensate and being otherwise independent of said removal means. - View Dependent Claims (3, 4, 5, 6, 7)
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8. The method of increasing heat transfer from steam within a hollow cylindrical dryer drum to the outer surface of the outer shell thereof, comprising the steps:
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directing a flow of steam into the interior of the drum for providing heat energy to be transferred to the outer shell; removing continually condensate forming on the inner surface of the outer shell with a thin layer of rimming condensate remaining on the inner surface of the outer shell; and generating a visual high level of turbulence in the rimming layer of condensate causing the rimming condensate to collapse by projecting a plurality of bristles toward the inner surface of the shell in close running relation to the shell surface. - View Dependent Claims (9, 10)
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Specification