US3838000A - Method and device for moisturizing a web,including an air header with perforated walls - Google Patents

Method and device for moisturizing a web,including an air header with perforated walls Download PDF

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Publication number
US3838000A
US3838000A US00259794A US25979472A US3838000A US 3838000 A US3838000 A US 3838000A US 00259794 A US00259794 A US 00259794A US 25979472 A US25979472 A US 25979472A US 3838000 A US3838000 A US 3838000A
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United States
Prior art keywords
web
air
header
chamber
suction box
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Expired - Lifetime
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US00259794A
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English (en)
Inventor
J Urbas
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Hercules LLC
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Midland Ross Corp
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Assigned to HERCULES INCORPORATED reassignment HERCULES INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MIDLAND-ROSS CORPORATION
Assigned to HERCULES INCORPORATED reassignment HERCULES INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MIDLAND-ROSS CORPORATION
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the web is then conveyed through a humidity chamber for the purpose of having the moisture soak through the web. After the web leaves the humidity chamber, another set of nozzles sprays mists on the surfaces of the web once more.
  • FIG. 1 is a schematic view illustrating web treating equipment which incorporates the principles of this invention:
  • FIG. 2 is a detailed cross-sectional view illustrating the means for moisturizing a continuously moving paper web
  • FIG. 3 is a diagram illustrating an example of results achieved when two bodies of air having different conditions are mixed.
  • the invention utilizes the mixing of two or more gas streams having different states with the intent of producing a mist of the medium.
  • the invention will be described by the use of adding moisture to an air-permeable paper web; however, it will be understood that this is for purposes of illustration only and it is not intended to be limited thereto as other condensable liquids may be added to various webs utilizing the principles expressed herein.
  • Two or more streams of air having different temperatures and relative humidities are mixed with one another within a chamber that is spaced relative to a suction box. As a result of this mixing, a mist of water vapor is formed.
  • the air-permeable web is conveyed between the chamber and the suction box and this mist is drawn therethrough by the action of the suction box on the surface of the web opposite the humidity chamber. It has been found that in this way a controlled uniform amount of moisture may be added to a paper web.
  • a paper web treating apparatus having a steam dryer roll 10 and a sweat dryer roll 12. Disposed intermediate these two dryer rolls 10, 12 is a felt roll 14 about which a felt 16 travels that is subsequently conveyed about the sweat roll 12. There is a second felt roll 18 on the opposite side of the sweat roll to receive the felt 16.
  • the felt 16 is a. foraminous material of the general type used for support during the treating of a paper web. There are a plurality of other felt rolls 20, 22, 24 and 26 which, in cooperation with the other rolls 12, 14 and 18, convey the felt as shown in the drawing.
  • Adjacent the felt conveying portion of the apparatus are a plurality of calender rolls 28 in tandem which calender an uncalendered paper Web 30 which has been previously conveyed about the steam dryer 10, the sweat dryer 12 and eventually along a horizontal and upwardly extending web path to the top nip 29 between the top two calender rolls 28.
  • a humidifier 32 which comprises a hollow suction box 34 and an air header 36 located on the upper and lower sides, respectively, of the web path.
  • the air header 36 is rectangular and has side walls 38, a floor 39 and an outer top wall 40, having a multiplicity of small openings 42 therein and facing the suction box as shown.
  • an interior perforated wall 44 Positioned within the air header 36 intermediate the floor 39 and the top wall 40 is an interior perforated wall 44 which extends to each of the side walls 38 and defines a pair of chamber 46 and 47 in the lower and upper portions of the air header, respectively.
  • One wall 38 of the header 36 has an opening 48 confluent with the chamber 46 and receives a pipe 50 therein.
  • Located within the upper chamber 47 are a plurality of ported tubes 52.
  • the suction box 34 is rectangular in configuration and is made up of a series of walls 54 there being a flat perforated wall 56 positioned in opposed generally parallel relation with the perforated wall 40 of the air header 36.
  • One of the walls 54 has an opening 58 which receives a pipe 60, which pipe is in communication with a pump 62 that creates a partial vacuum within the box 34, thereby drawing air under pressure through the perforations of wall 56 and causing the air within the air header 36 to be drawn through the openings 42 and toward the suction box 34.
  • the perforated walls 40, 44 and 56, and tubes 52 of the header 36 are preferably constructed and arranged in a generally coextensive relationship along the web path as shown in FIG. 2.
  • the perforated areas of the walls 40, 44 and 56 are shown as substantially coextensive in the widewise direction of these walls, i.e., the direction of web travel, as indicated by perforations corresponding to the arrows.
  • the tubes 52 are shown generally uniform- 1y spaced in the same widewise direction within the chamber 47 to effect general distribution of air discharged from the tubes 52 throughout the chamber 47 and uniform mixing with the saturated air of different temperature entering chamber 47 from chamber 46 through the apertures of wall 44.
  • the wall 40 apertured as shown restricts the free escape of air therefrom and thus promotes effective mixing of the two streams within the chamber 47 before they pass in mixed and misty condition through the apertures of wall 40.
  • operation of the suction box 34 assures that the partial vacuum conditions adjacent the apertured wall 56 thereof causes the passage of misty air efiiuent from apertures 42 of wall 40 into and through the web 30.
  • the felt 16 is conveyed about the rolls 14, 18, 20, 22, 24 and 26 as shown in FIG. 1.
  • the paper web 30 is carried about the steam dryer roll where it is partially dried.
  • the web 30 then is conveyed intermediate the sweat dryer 12 and felt 16 where it is further dried.
  • the web 30 and felt 16 are conveyed along a relatively straight path between rolls 18 and 20.
  • the web 30 and felt 16 pass through the humidifier 32 intermediate the suction box 34 and the air header 36. Downstream from the humidifier 32 the felt 16 parts from the web 30 by rotating about roll 20 toward roll 22 and the web passes through the first nip 29 of the calender rolls 28 and subsequently leaves the calender rolls through the bottom nip 31.
  • the web 30 may be diverted, as shown by the dotted arrow, so that it does not pass through the humidifier, but instead is conveyed directly to roll 24.
  • the individual temperatures, relative humidities and action of the air streams may be varied to control the supply of moisture to the web 30.
  • the system employs controlled precipitation of moisture by adding two psy chrometrically prepared air streams to effect precise avail ability of water mist in the air.
  • FIG. 3 shows two air streams of sufficiently different humidity to generate a mist.
  • Three mixing lines are shown where 70 F. saturated air is mixed with 174, 165 and 160 saturated air.
  • the saturated conditions are merely used as examples and, in actual practice, unsaturated air should be used to minimize dripping on the header surfaces prior to mixing.
  • the mixing line may be used to forecast the concentration of free water, or fog, in the air and may be replotted similar to the curve shown in FIG. 3. Where equal proportions of warm and cool air are mixed, e.g., 174 F. and 70 F.,
  • a method of applying moisture to an air pervious web, such as uncalendered paper comprising:
  • Apparatus for moisturizing an air pervious web comprising:
  • an air header having an outer perforated wall facing said suction box wall and providing a multiplicity of small openings therethrough, an end wall spaced therefrom, side walls connecting said perforated wall and said end wall, and an interior perforated wall which extends to each of the side walls positioned between the outer perforated wall and the end wall to define a first chamber adjacent said outer perforated wall contiguous with perforations therethrough, and a second chamber at an opposite side of said interior wall communicating with the first chamber through a multiplicity of small openings through said interior wall;
  • said perforated wall of the suction box having a perforated area spaced in opposed generally parallel coextensive relation with an area defining said multiplicity of openings of said outer perforated wall for passage of said web therebetween;
  • said openings of said inerior perforated wall and said means for introducing said first stream being relatively arranged to obtain uniform mixing of said two air streams in said first chamber adjacent said outer perforated wall;
  • said conveying means is a continuous felt for supporting said web; and said perforated wall of the suction box and the outer perforated wall of the header are spaced for passage of said Web and said felt there- 2,718,065 9/ 1955 Conti 3423 between. 2,370,811 3/1945 Osgood 3437 X 4.
  • said apparatus of claim 2 wherein: 2,838,982 6/ 1958 Tosquier 162290 said conveying means, suction box, and header are 3,320,676 5/1967 Speers 3423 arranged to locate the suction box above the web 1,843,656 2/1932 Tompkins et a1. 162207 X path and the header directly underneath the web 0 1,279,170 9/1918 Sullivan 162-374 X path and the suction box.

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  • Paper (AREA)
  • Printing Methods (AREA)
  • Treatment Of Fiber Materials (AREA)
US00259794A 1972-05-05 1972-06-05 Method and device for moisturizing a web,including an air header with perforated walls Expired - Lifetime US3838000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA141,416A CA961325A (en) 1972-05-05 1972-05-05 Device for adding a liquid component to a web

Publications (1)

Publication Number Publication Date
US3838000A true US3838000A (en) 1974-09-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00259794A Expired - Lifetime US3838000A (en) 1972-05-05 1972-06-05 Method and device for moisturizing a web,including an air header with perforated walls

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US (1) US3838000A (cg-RX-API-DMAC10.html)
JP (1) JPS5428487B2 (cg-RX-API-DMAC10.html)
CA (1) CA961325A (cg-RX-API-DMAC10.html)
FR (1) FR2184287A5 (cg-RX-API-DMAC10.html)
GB (1) GB1411902A (cg-RX-API-DMAC10.html)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992254A (en) * 1974-01-08 1976-11-16 Valmet Oy Structure for separating a web and wire in a paper machine
US4454171A (en) * 1980-12-08 1984-06-12 Samcoe Holding Corporation Method for wet processing, drying and moisture conditioning tubular knitted fabric
DE3503448A1 (de) * 1984-02-08 1985-08-08 Oy Wärtsilä Ab, Helsinki Verfahren und vorrichtung zum befeuchten einer endlosbahn
US4836894A (en) * 1982-09-30 1989-06-06 Beloit Corporation Profiling air/steam system for paper-making machines
US5470436A (en) * 1994-11-09 1995-11-28 International Paper Company Rewetting of paper products during drying
US5708904A (en) * 1996-06-14 1998-01-13 Eastman Kodak Company Photographic emulsion surface reforming method
US6073549A (en) * 1998-05-08 2000-06-13 V.I.B. Apparatebau Gmbh Apparatus for the on-line manufacture of SC-A paper
DE19901400A1 (de) * 1999-01-15 2000-07-20 Voith Sulzer Papiertech Patent Trocknungs- und Glättungseinheit für Faserstoffbahnen
DE19903581A1 (de) * 1999-01-29 2000-08-03 Voith Sulzer Papiertech Patent Trocknungs- und Glättungseinheit
US6113288A (en) * 1996-06-14 2000-09-05 Eastman Kodak Company Water deposition apparatus and method
US6207020B1 (en) * 1998-05-12 2001-03-27 International Paper Company Method for conditioning paper and paperboard webs
US6308436B1 (en) * 1998-07-01 2001-10-30 The Procter & Gamble Company Process for removing water from fibrous web using oscillatory flow-reversing air or gas
US6393719B1 (en) 1998-07-01 2002-05-28 The Procter & Gamble Company Process and apparatus for removing water from fibrous web using oscillatory flow-reversing air or gas
US6694870B1 (en) * 1999-06-17 2004-02-24 Metso Paper, Inc. Method for leading a web between calendar nips, and a calendar
US6699365B2 (en) * 2001-10-22 2004-03-02 Abb Inc. Method of wetting webs of paper or other hygroscopic material
US20050056392A1 (en) * 2003-09-12 2005-03-17 Anderson Dennis W. Apparatus and method for conditioning a web on a papermaking machine
WO2008145447A1 (de) * 2007-05-31 2008-12-04 Voith Patent Gmbh Verfahren und vorrichtung zum befeuchten einer materialbahn
US20120111516A1 (en) * 2010-04-29 2012-05-10 Metso Paper, Inc. Method and Apparatus for Treating a Fibrous Web
US20150136349A1 (en) * 2013-11-21 2015-05-21 Valmet Technologies, Inc. Method for Producing Fiber Webs and Production Line for Producing Fiber Webs
US10094067B2 (en) * 2016-04-11 2018-10-09 Valmet Technologies, Inc. Production line for producing fiber webs and a cooler

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992254A (en) * 1974-01-08 1976-11-16 Valmet Oy Structure for separating a web and wire in a paper machine
US4454171A (en) * 1980-12-08 1984-06-12 Samcoe Holding Corporation Method for wet processing, drying and moisture conditioning tubular knitted fabric
US4836894A (en) * 1982-09-30 1989-06-06 Beloit Corporation Profiling air/steam system for paper-making machines
DE3503448A1 (de) * 1984-02-08 1985-08-08 Oy Wärtsilä Ab, Helsinki Verfahren und vorrichtung zum befeuchten einer endlosbahn
US5470436A (en) * 1994-11-09 1995-11-28 International Paper Company Rewetting of paper products during drying
US5708904A (en) * 1996-06-14 1998-01-13 Eastman Kodak Company Photographic emulsion surface reforming method
US6113288A (en) * 1996-06-14 2000-09-05 Eastman Kodak Company Water deposition apparatus and method
US6073549A (en) * 1998-05-08 2000-06-13 V.I.B. Apparatebau Gmbh Apparatus for the on-line manufacture of SC-A paper
US6207020B1 (en) * 1998-05-12 2001-03-27 International Paper Company Method for conditioning paper and paperboard webs
US6613195B2 (en) 1998-05-12 2003-09-02 International Paper Company Method for conditioning paper and paperboard webs
US6393719B1 (en) 1998-07-01 2002-05-28 The Procter & Gamble Company Process and apparatus for removing water from fibrous web using oscillatory flow-reversing air or gas
US6308436B1 (en) * 1998-07-01 2001-10-30 The Procter & Gamble Company Process for removing water from fibrous web using oscillatory flow-reversing air or gas
US6490813B1 (en) 1999-01-15 2002-12-10 Voith Sulzer Papiertechnik Patent Gmbh Drying and smoothing unit for webs of fibrous material
DE19901400A1 (de) * 1999-01-15 2000-07-20 Voith Sulzer Papiertech Patent Trocknungs- und Glättungseinheit für Faserstoffbahnen
DE19903581A1 (de) * 1999-01-29 2000-08-03 Voith Sulzer Papiertech Patent Trocknungs- und Glättungseinheit
US6694870B1 (en) * 1999-06-17 2004-02-24 Metso Paper, Inc. Method for leading a web between calendar nips, and a calendar
US6699365B2 (en) * 2001-10-22 2004-03-02 Abb Inc. Method of wetting webs of paper or other hygroscopic material
US20050056392A1 (en) * 2003-09-12 2005-03-17 Anderson Dennis W. Apparatus and method for conditioning a web on a papermaking machine
US7125473B2 (en) 2003-09-12 2006-10-24 International Paper Company Apparatus and method for conditioning a web on a papermaking machine
WO2008145447A1 (de) * 2007-05-31 2008-12-04 Voith Patent Gmbh Verfahren und vorrichtung zum befeuchten einer materialbahn
US20100084104A1 (en) * 2007-05-31 2010-04-08 Spindler Joerg Process and device to moisten a web of material
US8029648B2 (en) 2007-05-31 2011-10-04 Voith Patent Gmbh Process and device to moisten a web of material
US20120111516A1 (en) * 2010-04-29 2012-05-10 Metso Paper, Inc. Method and Apparatus for Treating a Fibrous Web
US8425721B2 (en) * 2010-04-29 2013-04-23 Metso Paper, Inc. Method and apparatus for treating a fibrous web
US20150136349A1 (en) * 2013-11-21 2015-05-21 Valmet Technologies, Inc. Method for Producing Fiber Webs and Production Line for Producing Fiber Webs
US9322135B2 (en) * 2013-11-21 2016-04-26 Valmet Technologies, Inc. Method for producing fiber webs and production line for producing fiber webs
US10094067B2 (en) * 2016-04-11 2018-10-09 Valmet Technologies, Inc. Production line for producing fiber webs and a cooler

Also Published As

Publication number Publication date
JPS4961411A (cg-RX-API-DMAC10.html) 1974-06-14
GB1411902A (en) 1975-10-29
FR2184287A5 (cg-RX-API-DMAC10.html) 1973-12-21
JPS5428487B2 (cg-RX-API-DMAC10.html) 1979-09-17
CA961325A (en) 1975-01-21

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HERCULES INCORPORATED HERCULES PLAZA WILMINGTON, D

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MIDLAND-ROSS CORPORATION;REEL/FRAME:004343/0610

Effective date: 19841204

AS Assignment

Owner name: HERCULES INCORPORATED, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MIDLAND-ROSS CORPORATION;REEL/FRAME:005178/0217

Effective date: 19841204