WO1991008339A1 - Dispositif de presse par section - Google Patents

Dispositif de presse par section Download PDF

Info

Publication number
WO1991008339A1
WO1991008339A1 PCT/US1990/004773 US9004773W WO9108339A1 WO 1991008339 A1 WO1991008339 A1 WO 1991008339A1 US 9004773 W US9004773 W US 9004773W WO 9108339 A1 WO9108339 A1 WO 9108339A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
water
felt
pressing
pressing section
Prior art date
Application number
PCT/US1990/004773
Other languages
English (en)
Inventor
Jere W. Crouse
Roy J. Porter
Original Assignee
Beloit Corporation
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 Beloit Corporation filed Critical Beloit Corporation
Publication of WO1991008339A1 publication Critical patent/WO1991008339A1/fr

Links

Classifications

    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/029—Wet presses using special water-receiving belts

Definitions

  • the present invention relates to a press section apparatus for pressing water from a formed web. More particularly, the present invention relates to a press section apparatus in which the web is subjected to an increased temperature and pressure for an extended period for pressing water from the formed web.
  • U.S. Patent No. 4,738,752 teaches that when the backing roll of an extended nip press is heated, water vapor is generated within the web extending through a pressing section defined between the backing roll and a pressing shoe. Such water vapor urges water within the web in the liquid phase away from the web into a felt running contiguously with the web through the pressing section.
  • the present invention provides a simple and relatively inexpensive means for inhibiting delamination of the pressed web by the provision of a felt and further felt disposed between the web and a bearing blanket.
  • the present invention also provides alternatively a composite felt including a first layer for permitting the unimpeded passage therethrough of water in the liquid phase and a second hygroscopic layer for absorbing and transporting the water away from the pressing section.
  • Another object of the present invention is the provision of a press section apparatus in which the web is subjected to an increased temperature and pressure for an extended period so that water vapor generated within the web during passage of the web through the pressing section drives off from the web water within the web in the liquid phase.
  • the water in the liquid phase and the water vapor are vented through a felt and the water in the liquid phase is absorbed in a hygroscopic further felt disposed between the felt and a bearing blanket.
  • Another object of the present invention is the provision of a press section apparatus which includes a felt means comprising a composite felt having a first layer of absorbant material.
  • the first layer is of open construction for permitting unimpeded passage therethrough of water in the liquid phase and water vapor.
  • a second layer of hygroscopic material absorbs the water in the liquid phase. The second layer also transports the water in the liquid phase away from the pressing section so that delamination of the pressed web is inhibited.
  • Another object of the present invention is the provision of a press section apparatus which includes a steam box which is disposed adjacent to the web and immediately upstream relative to a pressing section for pre-steaming the web so that the removal of water therefrom is facilitated.
  • Another object of the present invention is the provision of a press section apparatus which includes a guide roll which is disposed downstream relative to the pressing section for guiding the elt such that when the felt and the further felt diverge relative to each other, the felt follows the backing roll and is guided around the guide roll away from the backing roll.
  • Another object of the present invention is the provision of a press section apparatus in which the felt is fabricated from heat resistant fibers so that the felt supports the web during movement of the web around the backing roll.
  • Another object of the present invention is the provision of a press section apparatus in which the felt defines a fine, smooth face disposed contiguously relative to the web for inhibiting marking of the pressed web.
  • Another object of the present invention is the provision of a press section apparatus in which the felt is constructed of heat resistant fibers so that during operation of the press section apparatus, the felt remains dry.
  • the present invention relates to a press section apparatus and method for pressing water from a formed web.
  • the apparatus includes a press frame and a backing roll which is rotatably supported by the frame.
  • An elongate pressing means cooperates with the backing roll for defining therebetween an elongate pressing section for pressing water from the formed web.
  • a looped bearing blanket extends through the pressing section with the blanket being disposed between the pressing means and the backing roll for supporting the web during passage of the web through the pressing section.
  • a heating means is disposed adjacent to the backing roll for heating the backing roll so that the web extending through the pressing section is subjected to an increased temperature and pressure for an extended period such that water vapor generated within the web during passage of the web through the pressing section drives off from the web water within the web in the liquid phase.
  • the apparatus also includes felt means disposed between the web and the blanket for permitting the water in the liquid phase to be vented from the pressing section and for absorbing and transporting water in the liquid phase away from the pressing section so that delamination of the
  • the elongate pressing means is a hydrodynamic shoe whereas in another embodiment of the present invention, the elongate pressing means is a hydrostatic shoe.
  • the bearing blanket defines a smooth, impervious surface which is disposed towards the backing roll.
  • the blanket defines a textured surface.
  • the blanket is vented.
  • the heating means in a preferred embodiment of the present invention is an induction heater disposed upstream relative to the pressing section.
  • the felt means includes a felt which is disposed between the web and the blanket for permitting the water in the liquid phase and the water vapor to pass therethrough.
  • the felt means also includes a further felt disposed between the felt and the blanket for absorbing and transporting the water in the liquid phase away from the pressing section so that delamination of the pressed web is inhibited.
  • the felt means is a composite felt which includes a first layer of absorbant material of open construction for permitting unimpeded passage therethrough of water in the liquid phase.
  • the felt means also includes a second layer of hygroscopic material for absorbing the water in the liquid phase and for transporting the water in the liquid phase away from the pressing section so that delamination of the pressed web is inhibited.
  • the press section apparatus includes a press roll means which is disposed upstream relative to the pressing section for initiating the removal of water from the web.
  • the press section apparatus includes a steam box means which is disposed adjacent to the web and immediately upstream relative to the pressing section for pre-steaming the web so that removal of water therefrom is facilitated.
  • the press section apparatus includes a guide roll which is disposed downstream relative to the pressing section for guiding the felt such that when the felt diverges relative to the further felt downstream relative to the pressing section, the felt follows the backing roll and is guided around the guide roll away from the backing roll.
  • the felt is fabricated from heat resistant fibers such that during operation of the press section apparatus, -the felt remains dry. Also, the felt defines a face which is disposed contiguously relative to the formed web, the face having a fine, smooth surface for inhibiting marking of the pressed web.
  • the present invention also includes a method for pressing water from a formed web.
  • the method includes the steps of: initially dewatering the formed web by passing the formed web between cooperating press rolls;
  • Figure 1 is an elevational view of a press section apparatus according to the present invention
  • Figure 2 is an enlarged view of the pressing section shown in Figure 1 showing a hydrodynamic shoe
  • Figure 3 is a similar view to that shown in Figure 2 but shows an alternative embodiment of the present invention including a hydrostatic shoe;
  • Figure 4 is a sectional view of an alternative embodiment of the present invention showing a composite felt
  • Figure 5 is a side-elevational view similar to that shown in Figure 1 but shows an alternative embodiment of the present invention including a steam box;
  • Figure 6 is a side-elevational view of yet another embodiment of the present invention which includes a guide roll for guiding the felt away from the backing roll.
  • FIG. 1 is a side-elevational view of a press section apparatus generally designated 10 according to the present invention for pressing water from a formed web W.
  • the apparatus 10 includes a press frame 12 and a backing roll 14 rotatably supported by the frame 12.
  • An elongate pressing means generally designated 16 cooperates with the backing roll 14 for defining therebetween an elongate pressing section 18 for pressing water from the formed web W.
  • a looped bearing blanket 20 extends through the pressing section 18.
  • the bearing blanket 20 is disposed between the pressing means 16 and the backing roll 14 for supporting the web W during passage of the web W through the pressing section 18.
  • Heating means 22 is disposed adjacent to the backing roll 14 for heating the backing roll 14 such that the web W extending through the pressing section 18 is subjected to an increased temperature and pressure for an extended period so that water vapor generated within the web W during passage of the web W through the pressing section 18 drives off from the web W water within the web W in the liquid phase.
  • the press section apparatus 10 also includes felt means generally designated 24 which is disposed between the web W and the blanket 20 for permitting the water in the liquid phase to be vented from the pressing section 18 and for absorbing and transporting the water in the liquid phase away from the pressing section 18 so that delamination of the pressed web W is inhibited.
  • Figure 2 is an enlarged elevational view of one embodiment of the present invention in which the elongate pressing means 16 is a hydrodynamic shoe 26..
  • the elongate pressing means 16A is a hydrostatic shoe 26A.
  • the bearing blanket 20 defines a smooth, impervious surface 28 which is disposed towards the backing roll 14.
  • the surface is textured.
  • the blanket is vented. Such venting may include grooving or blind drilling.
  • the heating means 22 shown in Figure 1 of the present invention is an induction heater which is disposed upstream relative to the pressing section 18.
  • the felt means generally designated 24 includes a felt 30 which is disposed between the web W and the blanket 20 for permitting the water in the liquid phase and the water vapor to pass therethrough.
  • the felt means 24 also includes a further felt 32 which is disposed between the felt 30 and the blanket 20 for absorbing and transporting the water in the liquid phase away from the pressing section 18 so that delamination of the pressed web W is inhibited.
  • FIG 4 is an enlarged section view of an alternative embodiment of the present invention in which a felt means 24B is a composite felt generally designated 34 which includes a first, layer 30B of absorbant material of open construction for permitting unimpeded passage therethrough of water in the liquid phase and the passage of water vapor therethrough.
  • the composite felt 34 also includes a second layer 32B of hygroscopic material for absorbing the water in the liquid phase and for transporting the water in the liquid phase away from the pressing section so that delamination of the pressed web WB is inhibited.
  • Figure 1 also shows .
  • the press rolls 38 and 40 cooperate together for initiating the removal of water from the web W.
  • Figure 5 is a similar view to that shown in Figure 1 but shows an alternative embodiment of the present invention.
  • Figure 5 shows an apparatus IOC including a steam box means generally designated 40 which is disposed adjacent to a web WC and immediately upstream relative to the pressing section 18C for pre-steaming the web WC so that removal of water therefrom is facilitated.
  • the steam box means 40 includes a steam box 42 and a vacuum box 44 so that steam is drawn by the vacuum box 44 into the formed web WC.
  • Figure 6 shows an alternative embodiment of the present invention which includes a guide roll 46 disposed downstream relative to a pressing section 18D for guiding a felt 30D such that when the felt 30D diverges relative to a .further felt 32D downstream relative to the pressing section 18D, the felt 30D follows a backing roll 14D and is guided around the guide roll 46 away from the backing roll 14D.
  • the felt 30D as in the other embodiments of the present invention is fabricated from heat resistant fibers.
  • the felt 30D defines a face 48 which is disposed contiguously relative to the formed web WD.
  • the face 48 has a fine, smooth surface for inhibiting marking of the pressed web WD.
  • the web W is initially dewatered during passage through the press means 36.
  • the web is then transferred to the felt 30 which transports the initially dewatered web through the pressing section 18.
  • the backing roll 14 is heated to a temperature within the range 400 - 700° Fahrenheit so that as the web extends through the pressing section 18, water vapor is generated within the web W.
  • Such water vapor drives off any water in the liquid phase remaining in the web.
  • Such water in the liquid phase passes unimpeded through the felt 30 and is absorbed by the further felt 32 so that the water in the liquid phase is transported away from the pressing section 18.
  • a steam box 42 and a vacuum box 44 are disposed immediately upstream relative to the pressing section 18C so that steam is drawn into the initially dewatered web, thereby facilitating removal of water therefrom during passage of the web through the pressing section 18C.
  • the felt 30D is guided around the guide roll 46 so that the felt 30D supports the web WD during passage of the web WD around the backing roll 14D. Thereafter, the felt 30D guides the pressed web away from the backing roll 14D so that the web supported by the felt 30D extends away from the backing roll 14D.
  • the present invention provides a simple and relatively inexpensive means for avoiding the problem of delamination in a press section apparatus having a heated backing roll.

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  • Paper (AREA)

Abstract

Un dispositif de presse par section (10) fait l'objet d'une invention pour exprimer l'eau d'une structure formée plate du type toile en rouleau (W). Le dispositif (10) comprend un châssis de presse (12) et un cylindre support (14) soutenu en rotation par le châssis (12). Un système de pression allongé (16) coopère avec le cylindre support (14) pour déterminer dans cet espace une section de pression allongée (18) pour exprimer l'eau de la structure (W). Une bande en boucle fermée montée sur roulements (20) passe par la section de pression (18), la bande (20) étant disposée entre le système de pression (16) et le cylindre support (14) pour maintenir la structure (W) pendant son passage dans la section de pression (18). Un réchauffeur (22) est en position adjacente au cylindre support (14) pour réchauffer le cylindre support (14) de façon que la structure (W) traversant la section de pression (18) soit soumise à une augmentation de température et de pression pendant une période prolongée de manière que la vapeur d'eau s'étant formée dans la structure (W) pendant son passage dans la section de pression (18) s'évacue de l'eau contenue dans la structure (W) en phase liquide. Le dispositif (10) comprend également un feutre (30) disposé entre la structure (W) et la bande (20) pour permettre à l'eau en phase liquide de s'évacuer de la section de pression (18) et un feutre supplémentaire (32) pour absorber et véhiculer l'eau en phase liquide hors de la section de pression (18) pour empêcher le délaminage de la structure (W) pressée.
PCT/US1990/004773 1989-11-27 1990-08-22 Dispositif de presse par section WO1991008339A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44180089A 1989-11-27 1989-11-27
US441,800 1989-11-27

Publications (1)

Publication Number Publication Date
WO1991008339A1 true WO1991008339A1 (fr) 1991-06-13

Family

ID=23754342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/004773 WO1991008339A1 (fr) 1989-11-27 1990-08-22 Dispositif de presse par section

Country Status (2)

Country Link
AU (1) AU6274690A (fr)
WO (1) WO1991008339A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008003A1 (fr) * 1990-10-31 1992-05-14 Beloit Corporation Procede de chauffage d'une bande de papier sur un cylindre exprimeur
EP0487483A1 (fr) * 1990-11-23 1992-05-27 Valmet Paper Machinery Inc. Procédure et disposition pour drainage d'une bande de papier par pressage
DE4138789A1 (de) * 1991-11-26 1993-05-27 Escher Wyss Gmbh Vorrichtung zur entwaesserung
DE4140879A1 (de) * 1991-12-11 1993-06-17 Voith Gmbh J M Pressenpartie
US5302252A (en) * 1991-11-26 1994-04-12 Sulzer-Escher Wyss Gmbh Heated extended nip press with inlet support pocket
EP0598991A1 (fr) * 1992-11-24 1994-06-01 J.M. Voith GmbH Section de presse pour une machine à papier
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
WO1995021962A1 (fr) * 1994-02-14 1995-08-17 Beloit Technologies, Inc. Appareil de pressage a haute temperature et a poids eleve
EP0726354A1 (fr) * 1995-02-04 1996-08-14 Voith Sulzer Papiermaschinen Gesellschaft mbH Groupe de séchage d'une section de séchage de matériaux en bande
EP0740017A1 (fr) * 1995-04-24 1996-10-30 Valmet Paper Machinery Inc. Section de pressage d'une machine à papier, comprenant deux interstices de pressage préparés
WO1998051859A1 (fr) * 1997-05-16 1998-11-19 The Procter & Gamble Company Technique de pressage humide de papier de soie au moyen de trois couches feutre
DE19845954A1 (de) * 1998-10-06 2000-04-13 Voith Sulzer Papiertech Patent Entwässerungsvorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1059983A (en) * 1963-04-16 1967-02-22 Huyck Corp Papermakers wet felt, method and apparatus for dewatering wet web using such felt
US3556940A (en) * 1968-04-08 1971-01-19 Beloit Corp Press assembly
FR2195723A1 (fr) * 1972-08-07 1974-03-08 Beloit Corp
EP0100895A2 (fr) * 1982-07-13 1984-02-22 A. Ahlström Osakeyhtiö Presse à pinçage prolongé
DE3515576A1 (de) * 1984-05-25 1985-11-28 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressstellen
GB2199398A (en) * 1986-12-24 1988-07-06 Escher Wyss Gmbh Dewatering a web of fibrous material
EP0289477A2 (fr) * 1987-04-28 1988-11-02 Valmet Paper Machinery Inc. Procédé pour le pressage à chaud d'une bande de papier et dispositif de séchage pour l'application du procédé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1059983A (en) * 1963-04-16 1967-02-22 Huyck Corp Papermakers wet felt, method and apparatus for dewatering wet web using such felt
US3556940A (en) * 1968-04-08 1971-01-19 Beloit Corp Press assembly
FR2195723A1 (fr) * 1972-08-07 1974-03-08 Beloit Corp
EP0100895A2 (fr) * 1982-07-13 1984-02-22 A. Ahlström Osakeyhtiö Presse à pinçage prolongé
DE3515576A1 (de) * 1984-05-25 1985-11-28 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressstellen
GB2199398A (en) * 1986-12-24 1988-07-06 Escher Wyss Gmbh Dewatering a web of fibrous material
EP0289477A2 (fr) * 1987-04-28 1988-11-02 Valmet Paper Machinery Inc. Procédé pour le pressage à chaud d'une bande de papier et dispositif de séchage pour l'application du procédé

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992008003A1 (fr) * 1990-10-31 1992-05-14 Beloit Corporation Procede de chauffage d'une bande de papier sur un cylindre exprimeur
US5611893A (en) * 1990-11-23 1997-03-18 Valmet Corporation Device for dewatering of a paper web including prepressing with extended nip shoe
EP0487483A1 (fr) * 1990-11-23 1992-05-27 Valmet Paper Machinery Inc. Procédure et disposition pour drainage d'une bande de papier par pressage
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
DE4138789A1 (de) * 1991-11-26 1993-05-27 Escher Wyss Gmbh Vorrichtung zur entwaesserung
US5302252A (en) * 1991-11-26 1994-04-12 Sulzer-Escher Wyss Gmbh Heated extended nip press with inlet support pocket
DE4140879A1 (de) * 1991-12-11 1993-06-17 Voith Gmbh J M Pressenpartie
EP0598991A1 (fr) * 1992-11-24 1994-06-01 J.M. Voith GmbH Section de presse pour une machine à papier
WO1995021962A1 (fr) * 1994-02-14 1995-08-17 Beloit Technologies, Inc. Appareil de pressage a haute temperature et a poids eleve
AU687974B2 (en) * 1994-02-14 1998-03-05 Beloit Technologies, Inc. Heavy-weight high-temperature pressing apparatus
EP0726354A1 (fr) * 1995-02-04 1996-08-14 Voith Sulzer Papiermaschinen Gesellschaft mbH Groupe de séchage d'une section de séchage de matériaux en bande
US5649371A (en) * 1995-02-04 1997-07-22 Voith Sulzer Papiermaschinen Gmbh Dry unit of a dry end of a machine for producing material webs
US5650049A (en) * 1995-04-24 1997-07-22 Valmet Corporation Press section of a paper machine employing two separate press nips
EP0740017A1 (fr) * 1995-04-24 1996-10-30 Valmet Paper Machinery Inc. Section de pressage d'une machine à papier, comprenant deux interstices de pressage préparés
US5762761A (en) * 1995-04-24 1998-06-09 Valmet Corporation Press section of a paper machine employing two separate press nips
WO1998051859A1 (fr) * 1997-05-16 1998-11-19 The Procter & Gamble Company Technique de pressage humide de papier de soie au moyen de trois couches feutre
DE19845954A1 (de) * 1998-10-06 2000-04-13 Voith Sulzer Papiertech Patent Entwässerungsvorrichtung

Also Published As

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