WO1998054404A1 - Appareil a presse a pince allongee - Google Patents

Appareil a presse a pince allongee Download PDF

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Publication number
WO1998054404A1
WO1998054404A1 PCT/US1998/006993 US9806993W WO9854404A1 WO 1998054404 A1 WO1998054404 A1 WO 1998054404A1 US 9806993 W US9806993 W US 9806993W WO 9854404 A1 WO9854404 A1 WO 9854404A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
felt
extended nip
press
pick
Prior art date
Application number
PCT/US1998/006993
Other languages
English (en)
Inventor
David V. Lange
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.
Priority to CA002325914A priority Critical patent/CA2325914A1/fr
Priority to AU69575/98A priority patent/AU6957598A/en
Publication of WO1998054404A1 publication Critical patent/WO1998054404A1/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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip

Definitions

  • the present invention relates to an extended nip press section apparatus for pressing water from a formed web. More particularly, the present invention relates to an extended nip press section apparatus for inhibiting two-sidedness of the resultant pressed web.
  • press sections for papermaking machines have become relatively complex.
  • some press sections include four or five press nips in order to maximize the dryness of the out-going pressed web and to minimize two-sidedness of the resultant sheet.
  • Two-sidedness is a problem which basically comes about as a result of water flowing more in one direction than another away from the web during passage of the web through a press nip.
  • the resultant web will have minimal two-sidedness. That is, both sides of the resultant web will have substantially the same surface characteristics thereon.
  • release rolls associated with such presses are often fabricated from granite.
  • the sheet attains a smooth surface on the roll side and a relatively rough surface on the felt side.
  • the aforementioned presses also typically include suction rolls which are expensive to maintain and which limit the potential loading capabilities of the nip and can cause shadow marking in the sheet.
  • Another object of the present invention is the provision of an extended nip press section apparatus which includes a press felt having a water permeability which is less than the water permeability of the pick-up felt so that the web predictably follows the press felt rather than the pickup felt and which inhibits two-sidedness in the resultant pressed web.
  • Another object of the present invention is the provision of an extended nip press section apparatus which is extremely compact and which avoids the problem of rewetting the web.
  • the present invention relates to an extended nip press section apparatus for pressing water from a formed web.
  • the apparatus includes an elongate press shoe and a vented backing roll which cooperates with the shoe for defining therebetween an extended nip for the passage therethrough of the web.
  • a bearing blanket slidingly cooperates with the shoe and extends through the extended nip with the blanket being disposed between the web and the shoe.
  • a pick-up felt extends through the extended nip for conveying the web to and through the extended nip.
  • a press felt extends through the extended nip such that the web is disposed between the press felt and the pick-up felt during movement thereof through the extended nip.
  • the press felt has a water permeability which is less than that of the pick-up felt such that the web predictably follows the press felt rather than the pick-up felt when the pick-up felt diverges relative to the press felt downstream relative to the extended nip.
  • the arrangement is such that two-sidedness of the resultant pressed web is inhibited.
  • the elongate press shoe is hydrodynamic shoe, and in another embodiment of the present invention, the press shoe is a hydrostatic shoe.
  • the press shoe is disposed beneath the vented backing roll.
  • the vented backing roll has a cylindrical circumferential surface which defines a plurality of blind drilled holes according to one embodiment of the present invention.
  • the cylindrical circumferential surface of the backing roll defines a plurality of circumferential grooves.
  • the press section apparatus also includes a saveall which cooperates with the vented backing roll for collecting water removed from the web during movement of the web through the extended nip. Additionally, the bearing blanket defines a plurality of grooves on a surface thereof which faces towards the press felt for assisting drainage from the extended nip.
  • the press section apparatus includes a steam box which is disposed on one side of the pick-up felt for applying steam to the web supported beneath the pick-up felt upstream relative to the press felt.
  • a vacuum box is disposed on an opposite side of the web and pick-up felt relative to the steam box.
  • the vacuum box is connected to a source of partial vacuum such that the steam from the steam box is drawn into the web.
  • the arrangement is such that the viscosity of the water within the web is decreased by the application thereto of the steam so that the subsequent removal of the water from the web during passage thereof through the extended nip is facilitated.
  • the press felt in a specific embodiment of the present invention includes a base fabric and a permeability control layer which is disposed contiguously on one side of the base fabric.
  • a layer of batt fibers is disposed contiguously relative to the permeability control layer such that the permeability control layer is disposed between the layer of batt fibers and the base fabric for inhibiting rewetting of the web downstream relative to the extended nip and for predictably assisting the web to follow the press felt rather than the pickup felt downstream relative to the extended nip.
  • the press section is inverted such that the pick-up felt is disposed between the shoe and the web. Furthermore, the press felt extends through the extended nip with the press felt being disposed between the backing roll and the web so that the web is disposed between the pick-up felt and the press felt.
  • the backing roll can be either a plane roll or a vented roll and the bearing blanket can be a plane blanket or a grooved blanket or alternatively a blanket with blind drilled drainage holes defined therein.
  • Figure 1 is a side-elevational view of an extended nip press section apparatus according to the present invention for pressing water from a formed web;
  • Figure 2 is an enlarged view of the extended nip showing the press shoe as a hydrodynamic shoe
  • Figure 3 is a similar view to that shown in Figure 2, but shows an alternative embodiment of the present invention in which the press shoe is a hydrostatic shoe;
  • Figure 4 is a perspective view of the vented backing roll showing the surface thereof defining a plurality of blind drilled holes
  • Figure 5 is a similar view to that shown in Figure 4, but shows an alternative embodiment of the present invention in which the surface of the backing roll defines a plurality of circumferential grooves;
  • Figure 6 is a top plan view of a portion of the bearing blanket shown in Figure 1 showing a plain surface thereon;
  • Figure 7 is a similar view to that shown in Figure 6, but shows the surface of the bearing blanket towards the press felt defining a plurality of grooves for assisting drainage of water from the extended nip;
  • Figure 8 is an enlarged sectional view of the press felt showing the base fabric, control layer and the layer of batt fibers;
  • Figure 9 is a graph showing a pressure profile obtained using the apparatus according to the present invention.
  • Figure 10 is a graph showing another pressure profile achieved using the apparatus according to the present invention.
  • Figure 1 1 is a graph showing yet another pressure profile obtained using the apparatus according to the present invention.
  • Figure 1 2 is a side elevational view of a preferred embodiment of the present invention.
  • Figure 1 3 is a side elevational view of an alternative embodiment of the arrangement shown in Figure 1 2.
  • FIG. 1 is a side-elevational view of an extended nip press section apparatus, generally designated 10 according to the present invention, for pressing water, as indicated by the arrow 12, from a formed web W.
  • the press section apparatus 10 includes an elongate press shoe 14 and a vented backing roll 16 which cooperates with the shoe 14 for defining therebetween an extended nip 18 for the passage therethrough of the web W.
  • a bearing blanket 20 slidably cooperates with the shoe 14 and extends through the extended nip 18. The blanket 20 is disposed between the web W and the shoe 14.
  • a pick-up felt 22 extends through the extended nip 18 for conveying the web W to and through the extended nip 18.
  • the pick-up felt 22 is disposed between the backing roll 16 and the web W such that the web W is conveyed between the pick-up felt 22 and the blanket 20 during movement thereof through the extended nip 18.
  • a press felt 24 extends through the extended nip 18 and is disposed between the blanket 20 and the web W such that the web W is disposed between the press felt 24 and the pick-up felt 22 during movement of the web W through the extended nip 18.
  • the press felt 24 has a water permeability which is less than the water permeability of the pick-up felt 22.
  • the arrangement is such that the web W predictably follows the press felt 24 rather than the pick-up felt 22 when the pick-up felt 22 diverges relative to the press felt 24 downstream relative to the extended nip 18.
  • the arrangement is such that two-sidedness of the resultant pressed web W is inhibited.
  • Figure 2 is an enlarged side-elevational view of the elongate press shoe 14 showing the press shoe 14 as a hydrodynamic shoe.
  • Figure 3 is a similar view to that shown in Figure 2, but shows the press shoe 14A as a hydrostatic shoe.
  • FIG 4 is a perspective view of the vented backing roll 16 shown in Figure 1 .
  • the backing roll 16 has a cylindrical circumferential surface 26 which defines a plurality of blind drilled holes 28, 29 and 30.
  • Figure 5 is a similar view to that shown in Figure 4, but shows the vented backing roll 16B as having a cylindrical circumferential surface 26B which defines a plurality of circumferential grooves 28B, 29B and 30B.
  • the apparatus 10 includes a saveall 32 which cooperates with the vented backing roll 16 for collecting water 12 removed from the web W during movement of the web W through the extended nip 18.
  • Figure 6 is an enlarged top plan view of the bearing blanket 20 showing the surface thereof as being a plain surface.
  • Figure 7 is a similar view to that shown in Figure 6, but shows an alternative embodiment of the present invention in which the bearing blanket 20C defines a plurality of grooves 34,35 and 36 on a surface thereof facing towards the press felt 24 for assisting drainage from the extended nip 18.
  • the apparatus 10 also includes a steam box 38 which is disposed on one side 40 of the pick-up felt 22 for applying steam to the web W supported beneath the pick-up felt 22 upstream relative to the press felt 24.
  • a vacuum box 42 is disposed on an opposite side 44 of the web W and pick-up felt 22 relative to the steam box 38.
  • the vacuum box 42 is connected to a source of partial vacuum 46 such that steam from the steam box 38 is drawn into the web W.
  • the arrangement is such that the viscosity of water within the web W is decreased by the application thereto of the steam so that the subsequent removal of the water from the web W during passage thereof through the extended nip 18 is facilitated.
  • Figure 8 is an enlarged sectional view of the press felt 24 which includes a base fabric 48 and a permeability control layer 50 disposed contiguously on one side 52 of the base fabric 48.
  • a layer of batt fibers 54 are disposed contiguously relative to the permeability control layer 50 such that the permeability control layer 50 is disposed between the layer of batt fibers 54 and the base fabric 48 for inhibiting rewetting of the web W downstream relative to the extended nip 18 and for predictably assisting the web W to follow the press felt 24 rather than the pick-up felt 22 downstream relative to the extended nip 18.
  • Figures 9, 1 0 and 1 1 are graphs showing various pressure profiles 56,58 and 60, respectively, obtained using the equipment according to the present invention.
  • the web is transferred to the pick-up felt 22 such that the web is disposed beneath the pick-up felt 22.
  • the web sandwiched between the pick-up felt 22 and the press felt 24 is guided towards the extended nip 18 where water is removed therefrom into the saveall 32, which cooperates with the vented backing roll 16 for collecting water 12 removed from the web.
  • the web predictably follows the press felt 24 rather than the pick-up felt 22. Thereafter, the web is transferred from the press felt 24 into the downstream dryer section, generally designated 62.
  • the press section is inverted such that the pick-up felt 22d is disposed between the shoe 14d and the web Wd.
  • the press felt 24d extends through the extended nip 18d with the press felt 24d being disposed between the backing roll 16d and the web Wd so that the web is disposed between the pick-up felt 22d and the press felt 24d.
  • the backing roll 16d can be either a plane roll as shown in Fig. 12 or a vented roll 16e as shown in Fig. 13.
  • the bearing blanket 20d can be a plane blanket or a grooved blanket or alternatively a blanket with blind drilled drainage holes defined therein.
  • the present invention provides a double felted extended nip press, which is particularly capable of pressing a news or fine paper sheet as dry as any of the traditional multi-nip press sections.

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  • Paper (AREA)

Abstract

Cet appareil à presse à pince allongée (10) est destiné à exprimer l'eau présente dans un voile (W) formé. L'appareil comporte un sabot de presse de forme allongée (14) et un contre-rouleau ventilé (16) coopérant avec celui-ci, définissant ainsi une pince allongée (18) au travers de laquelle passera le voile. Un blanchet de support (20) coopère de façon coulissante avec le sabot (14) et traverse la pince allongée, étant placé entre le voile (W) et le sabot (14). Un feutre de transfert (22) passe à travers la pince allongée pour transporter le voile vers cette pince et lui faire traverser celle-ci. Un feutre de presse (24) passe à travers la pince allongée de sorte que le voile (W) vient se placer entre le feutre de presse (24) et le feutre de transfert (22) durant son passage à travers la pince allongée. La perméabilité à l'eau du feutre de presse (24) est inférieure à celle du feutre de transfert (22) de sorte que le voile (W) est davantage susceptible de suivre le feutre de presse (24) que le feutre de transfert (22) lorsque celui-ci s'écarte du feutre de presse vers l'aval par rapport à la pince allongée, l'agencement étant tel qu'un aspect 'double face' du voile (W) foulé est évité, ce qui revient à dire que l'on obtient un voile dont les deux faces ont des caractéristiques de surface identiques.
PCT/US1998/006993 1997-05-28 1998-04-06 Appareil a presse a pince allongee WO1998054404A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002325914A CA2325914A1 (fr) 1997-05-28 1998-04-06 Appareil a presse a pince allongee
AU69575/98A AU6957598A (en) 1997-05-28 1998-04-06 An extended nip press section apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86470797A 1997-05-28 1997-05-28
US08/864,707 1997-05-28

Publications (1)

Publication Number Publication Date
WO1998054404A1 true WO1998054404A1 (fr) 1998-12-03

Family

ID=25343879

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/006993 WO1998054404A1 (fr) 1997-05-28 1998-04-06 Appareil a presse a pince allongee

Country Status (3)

Country Link
AU (1) AU6957598A (fr)
CA (1) CA2325914A1 (fr)
WO (1) WO1998054404A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034947A1 (fr) * 2006-09-21 2008-03-27 Metso Paper, Inc. Machine à papier ou à carton et procédé de fabrication du papier ou du carton
WO2011151239A3 (fr) * 2010-06-01 2012-01-26 Voith Patent Gmbh Machine pour produire une bande de papier, en particulier une bande de papier pour sac

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107606A2 (fr) * 1982-09-29 1984-05-02 Beloit Corporation Procédé de transfert d'une nappe de papier
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
EP0705937A1 (fr) * 1994-10-06 1996-04-10 Valmet Corporation Section de presse dans une machine à papier comportant une presse d'égalisation
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
WO1997013030A1 (fr) * 1995-10-03 1997-04-10 Valmet Corporation Procede et dispositif permettant d'egoutter l'eau de bandes de papier ou de carton

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0107606A2 (fr) * 1982-09-29 1984-05-02 Beloit Corporation Procédé de transfert d'une nappe de papier
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
EP0705937A1 (fr) * 1994-10-06 1996-04-10 Valmet Corporation Section de presse dans une machine à papier comportant une presse d'égalisation
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
WO1997013030A1 (fr) * 1995-10-03 1997-04-10 Valmet Corporation Procede et dispositif permettant d'egoutter l'eau de bandes de papier ou de carton

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034947A1 (fr) * 2006-09-21 2008-03-27 Metso Paper, Inc. Machine à papier ou à carton et procédé de fabrication du papier ou du carton
WO2011151239A3 (fr) * 2010-06-01 2012-01-26 Voith Patent Gmbh Machine pour produire une bande de papier, en particulier une bande de papier pour sac
CN103097608A (zh) * 2010-06-01 2013-05-08 沃依特专利有限责任公司 用于制造纸幅面，尤其是袋用纸幅面的机器

Also Published As

Publication number Publication date
AU6957598A (en) 1998-12-30
CA2325914A1 (fr) 1998-12-03

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