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WO1993015268A1 - Procede et appareil augmentant la vitesse de sechage d'un materiau en bande - Google Patents

Procede et appareil augmentant la vitesse de sechage d'un materiau en bande Download PDF

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Publication number
WO1993015268A1
WO1993015268A1 PCT/CA1993/000019 CA9300019W WO9315268A1 WO 1993015268 A1 WO1993015268 A1 WO 1993015268A1 CA 9300019 W CA9300019 W CA 9300019W WO 9315268 A1 WO9315268 A1 WO 9315268A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
dryer
drying
flexible belt
belt
Prior art date
Application number
PCT/CA1993/000019
Other languages
English (en)
Inventor
Hugh Grigg Marshall
Andrew Stephen Haberl
Original Assignee
Asea Brown Boveri Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asea Brown Boveri Inc. filed Critical Asea Brown Boveri Inc.
Publication of WO1993015268A1 publication Critical patent/WO1993015268A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • This invention relates to a method and apparatus for enhancing the rate of drying of a web of material passing over a dryer cylinder in a dryer section of a web making machine and in particular, to a method and apparatus for enhancing the rate of drying of a web of paper in a paper making machine.
  • Web making machines particularly paper making machines may generally be divided into three sections namely, a forming section, a press section and a dryer section.
  • a forming section In modern paper machine former and press sections a large percentage of water is removed from the paper web.
  • water removed from the web after the press approaches 60% some water does remain in the web material and consequently the web has to be passed through a drying section which is normally composed of a plurality of steam heated dryer cylinders or drums which drives water out of the web by vaporization.
  • the dryer section is generally provided with a continuous belt of dryer fabrics which are held against approximately 50% of the dryer cylinder surface by fabric tension.
  • the web to be dried is generally fed with the dryer fabric onto the dryer cylinder surface, with the web material sandwiched between the dryer fabric and the dryer cylinder surface.
  • the dryer fabric presses against the web material and in turn presses the web material into intimate contact with the dryer cylinder surface.
  • dryer section arrangements known in the art. Examples of such dryer arrangements are two-tier and single-tier types. It has been generally found that some difficulties are encountered in the drying process when high pressure steam is used to dry thick web material such as board. The reasons for these difficulties are also known.
  • vapour being generated at the interface between the paper web and the surface of the metal dryer cylinder. If this vapour is generated in sufficient volume it causes the paper to lift off the metal dryer surface thereby causing a reduction in the heat transferred between the metal and the paper.
  • the present invention seeks to provide a simple and economical method and apparatus for improving the drying of a web in a dryer section of a web drying apparatus, and more specifically to dryer sections utilizing gas heated dryer cylinders or rolls.
  • the invention relates to a method of increasing the drying of a web material in a dryer section of a web drying apparatus, comprising; subjecting said web material to a combination of high surface temperature, such as by a gas heated paper dryer, and simultaneously increasing the pressure applied to said web, the increased pressure to be obtained by increasing the fabric tension above 8-75kN per square meter.
  • an apparatus for increasing the drying of a web material in a dryer section of a web making machine comprising: a dryer cylinder having an outer dryer surface adapted to be heated by gas or oil; a flexible belt trained over a plurality of guide rollers such that the belt is held in contact with the moveable fabric over at least a portion of the dryer surface in a drying region; a movable fabric trained about the dryer cylinder surface for carrying the web material over the dryer surface, the movable fabric being interspersed between the flexible belt and the web at the drying region; a pressure pad disposed on one side of the flexible belt and positioned opposite the drying region, and cooperating with the flexible belt for urging the web against the dryer surface in the drying region, such that lifting of the web by vapour generated between the web and the dryer surface is counteracted, thereby to increase the rate of drying of the web.
  • FIGURE 1 is a schematic side elevation view of a typical paper making machine
  • FIGURE 2 is a schematic side elevation view of a dryer section of the paper making machine of Figure 1;
  • FIGURE 3 is a schematic elevation view of apparatus according to the present invention;
  • FIGURE 4 is a magnified part view of the flexible belt shown in Figure 3;
  • FIGURE 5 is a cross sectional view along a line 5-5 in Figure 3;
  • FIGURE 6(a) is a cross sectional view of a labyrinth seal
  • FIGURE 6(b) is a cross sectional view of a rubbing seal
  • FIGURE 7 is a graph of the dryer metal surface temperature versus fabric tension
  • FIGURE 8 is a schematic elevation view of a dryer cylinder illustrating the means for collection of vapour at the sides of the belt.
  • FIGURE 9 is a view taken along the lines 9-9 of Figure 8.
  • a paper making machine is shown generally by -numeral 1.
  • the machine has a forming section 10 which generates a continuous web of partially dewatered paper.
  • a pressing section 12 presses the web to continue the dewatering process.
  • a plurality of intermediate dryer sections 14 and a final dryer section 16 drive moisture from the paper web.
  • the paper web is held against paper dryer rolls or cylinders 18 by fabric belts 20.
  • At least one of the paper and dryer rolls is a direct fired gas heated dryer of t e type shown in U.S. Patent 4,693,015.
  • a size press 24 is disposed between dryer sections to add size to the paper web.
  • the dried paper is ironed in calender rolls 26 and wound by winder 28.
  • a typical dryer section 14 is shown. This dryer section has gas heated dryer cylinders 30 and 32.
  • the dryer cylinder 30 is a direct fired dryer, which includes a generally cylindrical dryer shell.
  • a burner (not shown) oxidizes fuel and directs hot combustion gases along the interior of the dryer shell.
  • a flexible belt or blanket 38 is trained over a plurality of guide rollers 40 and is held in contact with the dryer surface 36 of a drying region 42.
  • the fabric belt 20 is shown trained about the dryer cylinder surface 36 and carrying the web 13 over the dryer surface in the drying region.
  • a pressure pad 44 is disposed on one side of the blanket 38 opposite the drying region 42.
  • the pressure pad 44 is comprised of an arcuate housing 46 which defines a pressure chamber 48. Pressure within the pressure pad chamber 48 exerts a downward or inward force on the blanket 38 which in turn presses the fabric 20 and the paper web 13 into intimate contact with the dryer surface 36 as the blanket, fabric and web are advanced over the dryer surface.
  • the pressure medium in the chamber 48 may be by a gas such as air.
  • a gas phase reactor 50 may be used to enhance the water resistant properties of the paper web 13.
  • a substance such as ASA (alkenyl succinic anhydride) or A D (alkyl ketene dimer) is sprayed on to the web 13 as at 50 and then enters the gas reaction chamber*. Such a process would use a special impermeable, high temperature fabric which would have to be used with the proper tension.
  • Gas heater paper dryers can be used to achieve the above process.
  • vapour generated in the web 13 has to flow through the web material in order to escape. Due to the considerable resistance to this flow by the web, vapour pressure between the web 13 and the dryer surface 36 increases to a point where the web 13 begins to lift off the dryer surface thereby causing a reduction in drying.
  • the pressure pad 44 in conjunction with the blanket 38 exerts a mechanical pressure on the web 13 specifically in the drying region 42. Most of the vapour is releasable from the web in this drying region 42 between the blanket 38, fabric 20 and the web 13 and, in order to allow more effective removal of vapour from the web, the blanket 38 may be provided with lateral or cross grooves 52 formed on a side facing the web 13.
  • the cross grooves 52 are shown on one side of the blanket 38 and running in a direction normal to the direction of advancement of the blanket over the dryer surface 36. Although in this preferred embodiment these grooves are extending shown in a lateral direction, grooves may also be provided in the longitudinal direction (not shown) of advance of the blanket 38.
  • pressure in the vapour release area 50 may be maintained at around atmospheric pressure or at some other optimal pressure, while the pressure on the opposite side of the blanket 38 is increased beyond atmospheric pressure in order to maintain the web in intimate contact with the dryer surface 36.
  • vapour released from the web 13 may be collected at the terminal end edges of the grooves 52 by arcuately shaped collection chambers 45 and 47 located adjacent the ends of the dryer cylinder 30 and in communication with the edges of the grooved belt 38.
  • one chamber such as 45 would be fixed in its location whereas chamber 47 at the other end of the cylinder would be retractable in the direction of the arrow shown in Figure 9 to allow threading operations to take place.
  • the front side of the chambers 47 would be cambered to allow retraction by screw jacks or the like to place the chambers clear of the cylinder 30 for purposes of threading.
  • Vapour collected in the manner shown in Figure 8 may then be recompressed from a reboiler and used in other conventional steam dryers in the paper machine system or the vapour may be used to preheat the web 13 before the press section
  • the pressure pad 44 may also be segmented (not shown) across its width in order to provide profiling in the evenness of the finished paper moisture.
  • Typical pressures used in the pressure pad are in the range of 2 to 5 psi.
  • the release of vapour from the web 13 may also be increased by increasing the tension in the fabric 20 when using high metal temperatures such as with a gas heated dryer.
  • high metal temperatures such as with a gas heated dryer.
  • Figure 7 a plot of improved contact heat transfer coefficient for increased felt tension is shown. Therefore, by increasing fabric tension, a significant increase in drying can be obtained when the increased fabric tension is used in combination with high metal temperatures.

Landscapes

  • Drying Of Solid Materials (AREA)

Abstract

L'invention décrit un procédé et un appareil permettant d'accroître la vitesse de séchage d'une bande de matériau (13) passant au-dessus d'un cylindre sécheur (30) dans une zone de séchage d'une machine de fabrication de bande, et en particulier à un procédé et à un appareil permettant d'accroître la vitesse de séchage d'une bande de papier continue dans une machine de fabrication de papier. Le procédé consiste à a) produire une température de surface élevée, par l'utilisation de sécheurs à papier chauffés au gaz, par exemple, et b) augmenter simultanément la pression appliquée sur la bande, au-dessus des cylindres sécheurs, de façon à obtenir les vitesses de séchage accrues. L'appareil comprend un cylindre sécheur (30) présentant une surface de séchage externe (36) conçue pour être chauffée. Une courroie flexible (38) passe sur une multiplicité de rouleaux de guidage (40) de façon que la courroie est maintenue en contact avec la toile mobile sur au moins une partie de la surface de séchage dans une zone de séchage. Une toile mobile (20) se déplace autour de la surface du cylindre sécheur afin de transporter la bande sur la surface de séchage, la toile mobile étant placée entre la courroie flexible et la bande dans la zone de séchage. Un tampon presseur (44) disposé d'un côté de la courroie flexible et placé du côté opposé de la zone de séchage, coopère avec la courroie flexible afin de pousser la bande contre la surface de séchage dans la zone de séchage et afin d'empêcher le soulèvement de la bande par la vapeur générée entre celle-ci et la surface de séchage, ce qui permet d'augmenter la vitesse de séchage de la bande.
PCT/CA1993/000019 1992-01-29 1993-01-28 Procede et appareil augmentant la vitesse de sechage d'un materiau en bande WO1993015268A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82732792A 1992-01-29 1992-01-29
US07/827,327 1992-01-29

Publications (1)

Publication Number Publication Date
WO1993015268A1 true WO1993015268A1 (fr) 1993-08-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1993/000019 WO1993015268A1 (fr) 1992-01-29 1993-01-28 Procede et appareil augmentant la vitesse de sechage d'un materiau en bande

Country Status (2)

Country Link
AU (1) AU3341793A (fr)
WO (1) WO1993015268A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623455A1 (de) * 1996-06-12 1997-12-18 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Erwärmen einer Warenbahn
DE19723163A1 (de) * 1997-06-03 1998-12-10 Voith Sulzer Papiermasch Gmbh Trockenpartie
WO2005100682A1 (fr) * 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
WO2008049661A3 (fr) * 2006-10-27 2008-08-14 Voith Patent Gmbh Capot de pression comportant un dispositif d'étanchéité amovible
US7510086B2 (en) * 2005-12-03 2009-03-31 Joachim Henssler Sealing arrangement
EP1586839A3 (fr) * 2004-04-13 2011-05-18 Voith Patent GmbH Ensemble d'étanchéité, notamment pour une installation de séchage
EP3859083A4 (fr) * 2018-10-04 2022-07-20 KNU-Industry Cooperation Foundation Appareil d'hydrophobisation par greffage de gaz de presse à chaud, et papier écologique de faible grammage absorbant l'huile fabriqué à l'aide de celui-ci

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151953A (en) * 1960-12-23 1964-10-06 Beloit Iron Works Belt conveying arrangement in paper drying machine
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3354035A (en) * 1966-11-08 1967-11-21 Albemarle Paper Co Continuous process of drying uncoated fibrous webs
EP0101202A2 (fr) * 1982-07-22 1984-02-22 The Wiggins Teape Group Limited Machine pour la fabrication du papier
EP0258169A1 (fr) * 1986-08-12 1988-03-02 Beloit Technologies, Inc. Dispositif de presse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151953A (en) * 1960-12-23 1964-10-06 Beloit Iron Works Belt conveying arrangement in paper drying machine
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3354035A (en) * 1966-11-08 1967-11-21 Albemarle Paper Co Continuous process of drying uncoated fibrous webs
EP0101202A2 (fr) * 1982-07-22 1984-02-22 The Wiggins Teape Group Limited Machine pour la fabrication du papier
EP0258169A1 (fr) * 1986-08-12 1988-03-02 Beloit Technologies, Inc. Dispositif de presse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623455A1 (de) * 1996-06-12 1997-12-18 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Erwärmen einer Warenbahn
DE19723163A1 (de) * 1997-06-03 1998-12-10 Voith Sulzer Papiermasch Gmbh Trockenpartie
US6189233B1 (en) 1997-06-03 2001-02-20 Voith Sulzer Papiermaschinen Gmbh Dryer section
WO2005100682A1 (fr) * 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
EP1586839A3 (fr) * 2004-04-13 2011-05-18 Voith Patent GmbH Ensemble d'étanchéité, notamment pour une installation de séchage
US7510086B2 (en) * 2005-12-03 2009-03-31 Joachim Henssler Sealing arrangement
WO2008049661A3 (fr) * 2006-10-27 2008-08-14 Voith Patent Gmbh Capot de pression comportant un dispositif d'étanchéité amovible
EP3859083A4 (fr) * 2018-10-04 2022-07-20 KNU-Industry Cooperation Foundation Appareil d'hydrophobisation par greffage de gaz de presse à chaud, et papier écologique de faible grammage absorbant l'huile fabriqué à l'aide de celui-ci

Also Published As

Publication number Publication date
AU3341793A (en) 1993-09-01

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