WO1995016821A1 - Appareil formant presse pour exprimer l'eau d'une bande formee - Google Patents

Appareil formant presse pour exprimer l'eau d'une bande formee Download PDF

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Publication number
WO1995016821A1
WO1995016821A1 PCT/US1994/014038 US9414038W WO9516821A1 WO 1995016821 A1 WO1995016821 A1 WO 1995016821A1 US 9414038 W US9414038 W US 9414038W WO 9516821 A1 WO9516821 A1 WO 9516821A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
web
felt
roll
disposed
Prior art date
Application number
PCT/US1994/014038
Other languages
English (en)
Inventor
Christine J. Mentele
Original Assignee
Beloit Technologies, 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 Beloit Technologies, Inc. filed Critical Beloit Technologies, Inc.
Publication of WO1995016821A1 publication Critical patent/WO1995016821A1/fr

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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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • D21F3/04—Arrangements thereof

Definitions

  • TITLE A PRESS APPARATUS FOR PRESSING WATER FROM A FORMED WEB
  • the present invention relates to a press apparatus for pressing water from a formed web.
  • the present invention relates to an extended nip press, followed by a further extended nip press.
  • the present invention relates to a press apparatus for producing paper grades in which maintaining bulk is an important feature.
  • the present invention includes a single felted ENP in the first press position, followed by a single felted ENP felted on the opposite side in the second press position.
  • Paper grades are currently being produced on machines with press sections having roll presses.
  • extended nip pressing has been demonstrated to achieve less density development than roll pressing at equal dryness.
  • bulk will be maximized for a given dryness.
  • each side of the sheet is pressed against a respective felt during movement of the web through the press nips to provide a sheet with similar roughness on both the top and bottom sides of the sheet.
  • Such an arrangement is beneficial in the following ways. First, a symmetrical sheet can be produced with better dryness at a given density. Secondly, a symmetrical sheet can be produced at higher bulk for a given dryness.
  • An additional advantage of the subject invention is that the configuration also requires fewer spare parts than the multiple roll press arrangements of the prior art machines.
  • roll presses in various configurations, such as Bi-Nips, Tri-Nips, Tri-Vents, etc. Some of these arrangements include a third or fourth press.
  • the roll press causes considerable densification of the sheet. Consequently, roll press loads are kept at levels which may not provide the desired dryness in order to keep bulk within acceptable limits.
  • the press configuration for the aforementioned roll press requires a costly inventory of spare rolls to be kept on hand, whereas the proposed dual ENP arrangement cuts down on the number of spare parts required. Also, rolls and shoes for both the first and the second press are interchangeable.
  • the subject press section includes a single felted ENP, followed by a second ENP, with a felting configuration opposite that of the first press. More particularly, the first press section is top felted, whereas the second press section is bottom felted.
  • the first section can be bottom felted and the second section top felted.
  • the aforementioned arrangements take advantage of the ENP's tendency to produce less bulk in pressing to a given dryness in each nip while making the sheet less two-sided as it exits the second nip.
  • the present invention relates to a press apparatus and method for pressing water from a formed web.
  • the apparatus includes an extended nip press for removing an initial quantity of the water from the formed web.
  • the press includes a press felt and a plain roll which cooperates with the press felt. The arrangement is such that the formed web is disposed between the felt and the roll so that one side of the web is disposed in physical contact with the plain roll.
  • a transfer felt cooperates with the plain roll such that the initially dewatered web is transferred from the plain roll to the transfer felt.
  • a further extended nip press is disposed downstream relative to the transfer felt.
  • the further felt includes a further press felt which cooperates with the transfer felt such that the initially dewatered web is transferred from the transfer felt to the further felt.
  • a further plain roll cooperates with the further felt such that the initially dewatered web is disposed between the further felt and the further roll. The arrangement is such that an opposite side of the web is disposed in physical contact with the further roll during movement of the web between the further felt and the further plain roll so that the bulk of the resultant web is maximized while maintaining similar roughness on the one side and the opposite side of the resultant web.
  • Figure 1 is a side-elevational view of one embodiment of the present invention.
  • FIG. 2 is a side-elevational view of an alternative embodiment of the present invention. Similar reference characters refer to similar parts throughout the various embodiments of the invention.
  • Figure 1 is a side-elevational view of a press apparatus, generally designated 10 according to the present invention, for pressing water from a formed web W.
  • the apparatus 10 includes an extended nip press, generally designated 12, for removing an initial quantity of the water from the formed web W.
  • the press 12 includes a press felt 14 and a plain roll 16 which cooperates with the press felt 14 such that the formed web W is disposed between the felt 14 and the roll 16. The arrangement is such that one side 18 of the web W is disposed in physical contact with the plain roll 16.
  • a transfer felt 20 cooperates with the plain roll 16 such that the initially dewatered web IDW is transferred from the plain roll 16 to the transfer felt 20.
  • a further extended nip press is disposed downstream relative to the transfer felt 20.
  • the further press 22 includes a further press felt 24 which cooperates with the transfer felt 20 such that the initially dewatered web IDW is transferred from the transfer felt 20 to the further felt 24.
  • a further plain roll 26 cooperates with the further felt 24 such that the initially dewatered web IDW is disposed between the further felt 24 and the further roll 26.
  • the arrangement is such that an opposite side28 of the web IDW is disposed in physical contact with the further roll 26 during movement of the web IDW between the further felt 24 and the further plain roll 26 so that the bulk of the resultant web RW is maximized while maintaining similar roughness on the one side 18 and the opposite side 28 of the resultant web RW.
  • the extended nip press 12 also includes a press shoe 30 which is disposed above the plain roll 16.
  • the press apparatus 10 also includes a first pick-up roll 32 which is disposed within the loop of the press felt 14 for transferring the formed web W onto the press felt 14.
  • the press apparatus 10 also includes a second pick-up roll 34 which is disposed within the loop of the transfer felt 20 for transferring the initially dewatered web IDW from the plain roll 16 onto the transfer felt 20.
  • the press apparatus 10 further includes a third pick-up roll 36 which is disposed within the loop of the further press felt24 for transferring the initially dewatered web IDW from the transfer felt 20 onto the further press felt 24.
  • the further extended nip press 22 also includes a further press shoe 38 which is disposed beneath the further plain roll 26.
  • the press apparatus 10 includes a steam box 40 disposed adjacent to the formed web W between the first pick-up roll 32 and the plain roll 16.
  • a vacuum box 42 is disposed on the opposite side of the formed webW and the press felt 14 relative to the steam box 40 such that steam is applied to the formed web for reducing the viscosity of the water within the web, thereby assisting removal of such water during movement of the formed web through the extended nip press 12.
  • the press apparatus 10 also includes a further steam box 44 which is disposed between the third pick-up roll 36 and the further plain roll 26 for applying steam to the initially dewatered web IDW disposed on the further press felt 24 between the third pick-up roll 36 and the further plain roll 26.
  • a further vacuum box 46 is disposed on an opposite side of the web and the further felt 24 relative to the further steam box 44.
  • the arrangement is such that the steam is applied to the web for reducing the viscosity of water within the initially dewatered web IDW for assisting removal thereof during movement of the initially dewatered web IDW through the further extended nip press 22.
  • Figure 2 is a side-elevational view of a further embodiment of the present invention. More specifically, Figure 2 shows a press apparatus, generally designated 10A, which includes an initial transfer felt 48 for transferring the formed web WA onto a press felt 14A.
  • a press apparatus generally designated 10A, which includes an initial transfer felt 48 for transferring the formed web WA onto a press felt 14A.
  • the press apparatus 10A also includes a press shoe 30A which is disposed beneath a plain roll 16A.
  • the initially dewatered web IDWA is transferred by a transfer felt 20A onto a further press felt 24A such that the initially dewatered web supported beneath the further press felt24A extends through a further extended nip press 22A.
  • the further extended nip press 22A includes a further press shoe 38A which is disposed above the further plain roll 26A.
  • the webW is transferred to the felt 14 by the pick-up roll 32. Steam is applied by steam box 40 for reducing the viscosity of the water within the web W.
  • the web W is initially dewatered by the interaction of press shoe 30 with the plain roll 16.
  • the web is transferred by transfer felt 20 to a further press felt 24 where further steam is applied to the web by steam box 44. Thereafter, the initially dewatered web is pressed by a further extended nip press 22 so that the surface texture on both sides of the resultant web RW are similar.
  • the bulk of the resultant web is maximized while maintaining the same surface texture on both sides of the resultant web.

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  • Paper (AREA)

Abstract

L'invention concerne un appareil formant presse (10) prévu pour exprimer l'eau d'une bande formée (W). Cet appareil comprend une presse de serrage (12) étendue pour retirer une quantité d'eau initiale d'une bande formée (W). Cette presse (12) se compose d'un feutre (14) pour la section de presse et d'un cylindre (16) lisse qui coopère avec le feutre de telle sorte que la bande formée (W) est placée entre le feutre (14) et le cylindre (16). On obtient une configuration telle qu'un côté (18) de la bande est en contact physique avec le cylindre (16). Un feutre de transfert (20) coopère avec le cylindre lisse de manière à assurer le transfert de la bande initialement égouttée (IDW) du cylindre lisse (16) au feutre de transfert (20). Une autre presse de serrage (22) est placée en aval par rapport au feutre de transfert. Cette autre presse (22) comprend un autre feutre de serrage (24) qui coopère avec le feutre de transfert (14) de telle sorte que la bande initialement égouttée (IDW) est transférée de ce feutre de transfert (14) à l'autre feutre (24). Un autre cylindre lisse (26) coopère avec ce dernier feutre (24) de telle sorte que la bande initialement égouttée (IDW) est placée entre le feutre (24) et le cylindre (26). On obtient une configuration telle qu'un côté opposé (28) de la bande est en contact physique avec le cylindre (26) lors du déplacement de la bande entre le feutre (24) et le cylindre (26). Ainsi, le volume de la bande obtenue (RW) est maximisé et l'on conserve une même rugosité sur le côté (18) et le côté opposé (28) de la bande obtenue (RW).
PCT/US1994/014038 1993-12-13 1994-12-05 Appareil formant presse pour exprimer l'eau d'une bande formee WO1995016821A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16618993A 1993-12-13 1993-12-13
US08/166,189 1993-12-13

Publications (1)

Publication Number Publication Date
WO1995016821A1 true WO1995016821A1 (fr) 1995-06-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/014038 WO1995016821A1 (fr) 1993-12-13 1994-12-05 Appareil formant presse pour exprimer l'eau d'une bande formee

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WO (1) WO1995016821A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0751255A1 (fr) * 1995-06-21 1997-01-02 Voith Sulzer Papiermaschinen GmbH Dispositif pour la déshumidification d'une bande fibreuse
US5650049A (en) * 1995-04-24 1997-07-22 Valmet Corporation Press section of a paper machine employing two separate press nips
US5766422A (en) * 1996-08-01 1998-06-16 Beloit Technologies, Inc. Lightweight high temperature pressing
US5888354A (en) * 1996-04-04 1999-03-30 Valmet Corporation Transfer of a web in a paper machine from a two-felt press nip to a dryer section
US6004430A (en) * 1995-10-04 1999-12-21 Ilvespaa; Heikki Method and device for enhancing the run of a paper web in a paper machine
US6350349B1 (en) 1996-05-10 2002-02-26 Kimberly-Clark Worldwide, Inc. Method for making high bulk wet-pressed tissue
DE10048700A1 (de) * 2000-09-30 2002-04-11 Voith Paper Patent Gmbh Pressenpartie
US6547924B2 (en) 1998-03-20 2003-04-15 Metso Paper Karlstad Ab Paper machine for and method of manufacturing textured soft paper
US8349138B2 (en) 2009-05-19 2013-01-08 Andritz Ag Device for treating a pulp web in an extended nip pressing unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE9206340U1 (de) * 1991-08-10 1992-08-13 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Pressenpartie einer Papiermaschine
WO1992020859A1 (fr) * 1991-05-24 1992-11-26 Beloit Technologies, Inc. Appareil de pressage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO1992020859A1 (fr) * 1991-05-24 1992-11-26 Beloit Technologies, Inc. Appareil de pressage
DE9206340U1 (de) * 1991-08-10 1992-08-13 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Pressenpartie einer Papiermaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
P. MIRSBERGER: "schuhpressen zum intensiven entwässern von papier und karton", DAS PAPIER, vol. 43, no. 10a, DARMSTADT, DE, pages 130 - 138, XP000081771 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5650049A (en) * 1995-04-24 1997-07-22 Valmet Corporation Press section of a paper machine employing two separate press nips
US5762761A (en) * 1995-04-24 1998-06-09 Valmet Corporation Press section of a paper machine employing two separate press nips
EP0751255A1 (fr) * 1995-06-21 1997-01-02 Voith Sulzer Papiermaschinen GmbH Dispositif pour la déshumidification d'une bande fibreuse
US5830323A (en) * 1995-06-21 1998-11-03 Voith Sulzer Papiermaschinen Gmbh Apparatus for dewatering a fiber web
US6004430A (en) * 1995-10-04 1999-12-21 Ilvespaa; Heikki Method and device for enhancing the run of a paper web in a paper machine
US6103066A (en) * 1996-04-04 2000-08-15 Valmet Corporation Methods for transferring a web in a paper machine from a two-felt press nip to a dryer section
US5888354A (en) * 1996-04-04 1999-03-30 Valmet Corporation Transfer of a web in a paper machine from a two-felt press nip to a dryer section
US5951821A (en) * 1996-04-04 1999-09-14 Valmet Corporation Arrangement and method for transferring a web in a paper machine from a two-felt press nip to a dryer section
US6350349B1 (en) 1996-05-10 2002-02-26 Kimberly-Clark Worldwide, Inc. Method for making high bulk wet-pressed tissue
US5766422A (en) * 1996-08-01 1998-06-16 Beloit Technologies, Inc. Lightweight high temperature pressing
US6547924B2 (en) 1998-03-20 2003-04-15 Metso Paper Karlstad Ab Paper machine for and method of manufacturing textured soft paper
DE10048700A1 (de) * 2000-09-30 2002-04-11 Voith Paper Patent Gmbh Pressenpartie
US8349138B2 (en) 2009-05-19 2013-01-08 Andritz Ag Device for treating a pulp web in an extended nip pressing unit

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