WO2008152195A1 - Procédé et appareil destinés à la fabrication de papier - Google Patents

Procédé et appareil destinés à la fabrication de papier Download PDF

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Publication number
WO2008152195A1
WO2008152195A1 PCT/FI2008/050324 FI2008050324W WO2008152195A1 WO 2008152195 A1 WO2008152195 A1 WO 2008152195A1 FI 2008050324 W FI2008050324 W FI 2008050324W WO 2008152195 A1 WO2008152195 A1 WO 2008152195A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
shoe press
static shoe
press unit
web
Prior art date
Application number
PCT/FI2008/050324
Other languages
English (en)
Inventor
Mika Laitila
Tarja Sinkko
Vesa Malmsten
Kai Latvala
Mikko Vuori
Vesa Rommi
Kaj Koskinen
Petri Tani
Vesa Suojanen
Vilho Nissinen
Original Assignee
Upm-Kymmene Oyj
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 Upm-Kymmene Oyj filed Critical Upm-Kymmene Oyj
Publication of WO2008152195A1 publication Critical patent/WO2008152195A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • 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
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • 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
    • 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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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
    • D21F5/18—Drying webs by hot air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a method defined in the preamble of claim 1 for removing water during pa- permaking, wherein paper is formed from a fibrous source material by feeding pulp to a wire section through a headbox, a web is formed at the wire section, and the web is led from the wire section to a drying section through a press section, and to an apparatus defined in the preamble of claim 6 for making paper.
  • the web formation section of a paper machine comprises a headbox section with a feed piping of the headbox and the headbox, and a wire section.
  • the purpose of the wire section is to form a web from fibre pulp arriving from the headbox, and to remove water from the fibre pulp by filtrating it through a wire cloth, bringing the web to a sufficiently high dry content.
  • a filtrate flow is produced by the pressure difference acting over a filtrated layer of fibres and the wire.
  • the fibre pulp has a thickness of about 0.2 - 1.2%, and the dry content of the web as it leaves the wire is about 15 - 20%.
  • the dry content of the paper web rises to a level of 40 - 55%.
  • moisture of the paper web is reduced by means of cylinders heated with steam.
  • the purpose of the drying section is to achieve a predetermined moisture level for the paper. It is known to use e.g. drying cylinders and/or suction cylinders at the drying section.
  • papermaking is principally dewatering and providing the paper with a desired moisture content e.g. prior to printing or other fur- ther processing.
  • the objective of the invention is to disclose a new, cost-effective method and apparatus for making paper and enhancing the removal of water from a paper web.
  • One specific objective of the invention is to provide a method and apparatus for making paper and removing water from a web substantially without interfering with the surface of the web.
  • the method and apparatus according to the invention are characterized by what has been presented in the claims.
  • the invention is based on a method for removing water during papermaking, wherein paper is formed by feeding pulp to a wire section through a headbox, a web is formed at the wire section and the web is led from the wire section to a drying section through a press section.
  • dewatering the web is enhanced and moisture content of the paper is reduced by removing water from the web that is being formed by at least one additional step selected from the following group: in a gap formed by the wires, an enhanced filtration over the wires is directed to the wires by raising the tension level of the wires clearly above the normal tension level; at least one suction cylinder is used to remove water from the web after the web formation, preferably for pre-pressing purposes; at least one static shoe press unit is used in conjunction with the wire section; at least one static shoe press unit is used between the wire section and the press section, e.g.
  • the invention is based on an apparatus for making paper, the apparatus comprising a headbox section and a wire section, a press section and a drying section.
  • the apparatus comprises at least one additional dewatering means for enhancing the removal of water from the web that is being formed and for reducing the moisture content of the paper, the dewatering means being selected from the following group: in the wire section of the apparatus, the wires form a gap, and the apparatus comprises means for adjusting the tension level of the wires, preferably by raising the tension level clearly above the normal level, and for directing an enhanced filtration over the wires; at least one suction cylin- der for removing water from the web after the web formation; at least one static shoe press unit arranged in conjunction with the wire section; at least one static shoe press unit arranged between the wire section and the press section; at least one static shoe press unit arranged in conjunction with the press section; at least one static shoe press unit arranged between the press section and the drying section; at least one static shoe press unit arranged in conjunction with the drying section; and/or at least one dewatering unit in conjunction with the drying section.
  • the dewatering means being selected from the following group: in the wire section of the apparatus, the
  • the invention is specifically based on a method and apparatus for enhancing the drying of the web and for optimizing the moisture content of the paper that is being formed, as well as for facilitating the production of the paper and for reducing the production costs, yet providing good quality to the paper.
  • the objective of the invention is to raise the dry content of the paper web preferably already prior to the drying section.
  • the method and the apparatus can be arranged to be extremely flexible relative to different paper grades.
  • dewatering is per- formed substantially with as little interference as possible with the surface of the web, substantially e.g. without breaking, modifying or heavy calendering of the surface.
  • paper refers to any fibre- based paper, board or fibre product or the like.
  • the paper may be made from chemical pulp, mechanical pulp, chemimechanical pulp, recycled pulp and/or the like.
  • the paper may be in the form of a wet web, dried web or sheet, or in other form which is suitable for the purpose.
  • the paper may comprise suitable fillers and additives .
  • water is preferably removed in the wire section by the vari- ous dewatering elements of the wire section known per se .
  • the wire section comprises a gap former. Rising speeds in paper machines and tightened quality criteria have increased the use of the gap formers as wire parts. Different kinds of gap formers are known, e.g. MB-, blade and cylinder gap formers and combinations thereof.
  • any devices and means known per se in which the web passes between nips, cylinders, rolls and/or the like which perform the pressing can be used as the pressing devices and means.
  • the press section may comprise one or more presses known per se, e.g. a suction cylinder press, a smooth press, a shoe press and/or a similar press.
  • the structure of the press section may be completely known per se.
  • pre-pressing is applied for reducing water in the paper web arriving from the wire section.
  • the pre-pressing may be performed in conjunction with the wire section and/or between the wire and the press section.
  • the drying section may have a structure that is completely known per se.
  • the drying section may comprise e.g. a condebelt dryer, a Yankee dryer, a Yankee cylinder, an impingement dryer and/or the like.
  • the drying section may include a number of drying devices or drying units.
  • the headbox used in the apparatus according to the invention may be any headbox known per se, e.g. a hydraulic headbox, a high consistency pulp headbox, a multiply headbox or the like.
  • a modified wire section is used, i.e. an enhanced filtration is directed over the wires in the gap formed by the wires, preferably in the dewatering gap, substantially during the web formation, by raising the tension level of the wires.
  • the modification of the gap, the narrowing/broadening of the gap allows one to control the wire tension.
  • adjusting the tension level of the wires and providing an enhanced filtration are applied at a consistency of the headbox that is higher than normally, e.g. at a headbox consistency of 3 - 4%. In an alternative embodiment, adjusting the tension level and providing an enhanced filtration are applied at a normal headbox consistency.
  • the web is arranged to pass over at least one large-radius suction cylinder designed for removing water after the web formation in order to control the dewatering. This is done by utilizing the centrifugal force by forming the web over at least one large-radius suction cylinder, e.g.
  • the dewatering is performed by the centrifugal force with as little interference with the web as possible.
  • the use a large-radius suction cylinder does not limit the speed of the paper machine.
  • a disk cylinder is used as the suction cylinder.
  • a static shoe-type dewatering means is used in the dewatering in the wire, press and/or drying section and/or therebetween.
  • Any shoe press device known per se may be used as the static shoe press unit.
  • a long-nip press device e.g. the long-nip press device according to patent publication FI 94368 (inventor Teuvo Rajamaki) is used as the static shoe press.
  • the shoe press unit may comprise a static shoe press means on both sides or only on one side of the press nip, in which case an opposing cylinder, a roll, a smooth surface or the like is used on the other side of the nip that is being formed.
  • the static shoe press unit may comprise one, two or more belt circulations per side.
  • the dewa- tering unit comprises a belt circulating member with a belt, e.g. a metal, steel or textile fabric belt, and at least two rolls or cylinders over which the belt is arranged to pass and run, thus forming a belt- circulated dewatering member.
  • the belt circulating mem- ber may be structurally of any shape, depending on the number of rolls or cylinders and/or their positioning.
  • the paper web may be sucked against the belt e.g. by impingement.
  • the dewa- tering unit comprises an opposing cylinder for forming a nip together with the belt circulating member.
  • the opposing cylinder is selected from the group of: a roll, a cylinder, a slide shoe, a static shoe, another belt circulating member according to the invention or the like.
  • the belt cir- culating member may operate as a calender nip with the opposing cylinder.
  • the belt circulating member comprises at least three or more rolls or cylinders over which the belt is arranged to pass.
  • the belt-circulated dewa- tering unit according to the invention may operate as a drying cylinder with optionally a paper web and a drying fabric on top of it.
  • heating means may be ar- ranged in conjunction with the belt circulating cylinder above and/or below the belt to heat one or both sides of the belt and the web.
  • Warming or heating of the web/belt, and thereby the removal of moisture are provided e.g. by steam, condensate, recovered heat of the drying section, hot air, high pressure air, by radiation or in a similar manner.
  • the steam and/or condensate system of the drying section steaming boxes, impingement units, heat pump technology or the like may be utilized.
  • the static shoe press unit arranged in the drying section may be arranged to be part of the dewatering unit, e.g.
  • the drying section may comprise one or more dewatering units. Multiple dewatering units may be arranged structurally in different manners, e.g. successively, two laid one above the other, and/or in a combination of these.
  • the web is pre-filtered by thickening the mid part, i.e. the core part, of the web and by thinning the surface layers.
  • the pre-filtration is performed in a slice chamber.
  • the slice chamber is part of the headbox through which the stock flows to the wire.
  • the pa- permaking comprises a web calendering step in a calendering section.
  • the calendering section may comprise devices that are known per se, e.g. a long nip calender, a belt calender or the like.
  • the calendering section may comprise at least one static shoe press unit for removing water.
  • the apparatus according to the invention may comprise one or more static shoe press units placed separately or serially in different sections of the apparatus and/or therebetween.
  • the web may be dried by the de- watering and drying methods and means known per se in conjunction with the wire section, press section, dry- ing section and/or calendering section and therebetween. Accordingly, the pres section, drying section, and/or calendering section may only comprise solutions according to the invention.
  • the formed paper web may be surface-treated by surface-sizing and/or coating in conjunction with the apparatus according to the invention, e.g. between the sections and/or in conjunction with the sections of the apparatus and/or after the apparatus .
  • the web is led to the press section in a closed system in such manner that there is a closed transfer from the wire section to the press section.
  • the web is led to the drying section from the press section by using a closed system.
  • additives such as pigments, bonding agents and chemicals, are added to the fibrous source material. Any agents and chemicals known in the art may be used as pigments, bonding agents and chemicals. The method and apparatus according to the invention provides considerable advantages compared to the prior art .
  • the invention it is possible to remove water and moisture more efficiently from the web and to achieve the desired dry content of the paper more easily. Furthermore, the bulk of the paper may be saved according to the invention.
  • the invention provides a simple and cost- effective manner of making quality paper.
  • the method and apparatus according to the invention are applicable for making different kinds of papers .
  • Fig. 1 represents an apparatus according to the invention for making paper.
  • Fig. 1 comprises a hydraulic headbox section and a modified wire section 2 as well as modified press 3, drying 4 and calendering sections 15. Furthermore, the apparatus comprises a number of dewatering means for en- hancing the removal of water from the web that is being formed and for reducing the moisture content of the paper.
  • the wires form a gap and the apparatus comprises means (not shown in the figure) for adjusting the tension level of the wires to be clearly higher than what is known, and for directing an enhanced filtration over the wires.
  • the apparatus comprises large-radius suction cylinders 6 for removing water from the web after the web formation and prior to the press section for pre-pressing purposes.
  • the large-radius suction cylinders are arranged serially in such manner that they can be used for removing water in both directions both above and below the web.
  • the press section 3 comprises two static shoe press units 7.
  • the static shoe press units comprise two belt circulations per side; an outer felt circulation against which the paper web is arranged, and an inner belt circulation comprising a grooved belt around the cylinders.
  • the belt may be grooved or perforated or alternatively smooth at the outer surface, i.e. at the surface against the felt. The purpose of the grooves or perforations is to transfer the water removed by the felt from the paper further away from the felt.
  • the drying section 4 comprises four dewatering units 8.
  • the dewatering units comprise a belt circulating member 10 with a metal belt 11 and five rolls 12 over which the belt is arranged to pass and run, thus forming the belt-circulated dewatering member 10.
  • another belt circulating member 10 operates as an opposing cylinder 13 in order to form a nip.
  • Heating of the metal belt and the web is performed using impingement units 16 and steaming boxes 17 in such manner that in the first and third belt circulating member, the impingement units 16 heat the upper side and the steaming boxes 17 heat the lower side of the web, and in the second and fourth belt circulating member, the impingement units 16 heat the lower side and the steaming boxes 17 heat the upper side of the web.
  • the calendering section 15 comprises one static shoe press unit 9 for removing moisture from the paper.
  • paper having a grammage of about 80gsm is formed from fibre pulp known per se by the method and apparatus according to the invention. Pigment and typically used bonding agents and chemicals are added to the fibrous source material.
  • the papermaking is performed in a manner known per se and is not described in more detail in this context.
  • the dewatering is substantially performed with as little interference as possible with the surface of the web that is being formed.

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  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

L'invention concerne un procédé et un appareil destinés à éliminer l'eau dans un processus de fabrication du papier. Pour fabriquer le papier, on place de la pâte sur une section de treillis par le biais d'une caisse de tête, une bande est formée sur la section de treillis et cette dernière est acheminée de la section de treillis à une section de séchage par une section de presse. Selon l'invention, l'essorage de la bande est amélioré et la teneur en humidité du papier est réduite par élimination de l'eau de la bande en cours de formation par au moins une unité de presse à semelle statique, cette unité de presse à semelle statique étant sélectionnée dans le groupe suivant: a) au moins une unité de presse à semelle statique utilisée conjointement à la section de treillis; b) au moins une unité de presse à semelle statique utilisée entre la section de treillis et la section de presse; c) au moins une unité de presse à semelle statique utilisée conjointement à la section de presse; d) au moins une unité de presse à semelle statique utilisée entre la section de presse et la section de séchage; e) au moins une unité de presse à semelle statique utilisée conjointement à la section de séchage; et/ou f) au moins une unité de presse à semelle statique utilisée conjointement à un calandrage.
PCT/FI2008/050324 2007-06-15 2008-06-03 Procédé et appareil destinés à la fabrication de papier WO2008152195A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075452A FI20075452L (fi) 2007-06-15 2007-06-15 Menetelmä ja laitteisto paperin valmistamiseksi
FI20075452 2007-06-15

Publications (1)

Publication Number Publication Date
WO2008152195A1 true WO2008152195A1 (fr) 2008-12-18

Family

ID=38212423

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/FI2008/050325 WO2008152196A1 (fr) 2007-06-15 2008-06-03 Procédé et appareil de fabrication du papier
PCT/FI2008/050324 WO2008152195A1 (fr) 2007-06-15 2008-06-03 Procédé et appareil destinés à la fabrication de papier

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050325 WO2008152196A1 (fr) 2007-06-15 2008-06-03 Procédé et appareil de fabrication du papier

Country Status (2)

Country Link
FI (1) FI20075452L (fr)
WO (2) WO2008152196A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3385445A1 (fr) * 2017-04-06 2018-10-10 BillerudKorsnäs AB Production de papier hautement étirable présentant des propriétés de surface satisfaisantes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5393384A (en) * 1992-07-27 1995-02-28 J. M. Voith Gmbh Paper machine for the production of tissue paper
US5520782A (en) * 1993-01-23 1996-05-28 J. M. Voith Gmbh Method and apparatus for removing water from a web by means of presses
WO2000034570A1 (fr) * 1998-12-07 2000-06-15 Valmet-Karlstad Ab Presse a sabot comprise dans la partie toile d'une machine a carton ou a papier et partie toile correspondante
US6306261B1 (en) * 1999-08-31 2001-10-23 Voith Sulzer Papiertechnik Gmbh Dewatering device and process and glazing device and process
DE10054674A1 (de) * 2000-11-03 2002-05-08 Voith Paper Patent Gmbh Schuhpresse
DE10161989A1 (de) * 2001-12-17 2003-06-18 Voith Paper Patent Gmbh Übergabevorrichtung

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Publication number Priority date Publication date Assignee Title
DE3128156C2 (de) * 1981-07-16 1985-01-24 J.M. Voith Gmbh, 7920 Heidenheim Siebpartie einer Papiermaschine
FI89614C (fi) * 1989-03-21 1993-10-25 Valmet Paper Macinery Inc Foerfarande och anordning foer upphettning av en pappers- eller kartongbana
US5851353A (en) * 1997-04-14 1998-12-22 Kimberly-Clark Worldwide, Inc. Method for wet web molding and drying
FI981600A (fi) * 1998-07-13 2000-01-14 Valmet Corp Menetelmä ja laitteisto paperin valmistamiseksi
DE60321573D1 (de) * 2003-09-26 2008-07-24 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US5393384A (en) * 1992-07-27 1995-02-28 J. M. Voith Gmbh Paper machine for the production of tissue paper
US5520782A (en) * 1993-01-23 1996-05-28 J. M. Voith Gmbh Method and apparatus for removing water from a web by means of presses
WO2000034570A1 (fr) * 1998-12-07 2000-06-15 Valmet-Karlstad Ab Presse a sabot comprise dans la partie toile d'une machine a carton ou a papier et partie toile correspondante
US6306261B1 (en) * 1999-08-31 2001-10-23 Voith Sulzer Papiertechnik Gmbh Dewatering device and process and glazing device and process
DE10054674A1 (de) * 2000-11-03 2002-05-08 Voith Paper Patent Gmbh Schuhpresse
DE10161989A1 (de) * 2001-12-17 2003-06-18 Voith Paper Patent Gmbh Übergabevorrichtung

Non-Patent Citations (1)

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Title
BAUMEISTER W. ET AL.: "UPM-Kymmene Norland Papier AG", XII VALMET PAPER TECHNOLOGY DAYS, VALMET CORPORATION, JYVÄSKYLÄ, FINLAND, 2000 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3385445A1 (fr) * 2017-04-06 2018-10-10 BillerudKorsnäs AB Production de papier hautement étirable présentant des propriétés de surface satisfaisantes
WO2018185216A1 (fr) * 2017-04-06 2018-10-11 Billerudkorsnäs Ab Production de papier hautement étirable présentant des propriétés de surface satisfaisantes
AU2018248870B2 (en) * 2017-04-06 2022-09-29 Billerudkorsnäs Ab Production of highly stretchable paper having satisfactory surface properties

Also Published As

Publication number Publication date
FI20075452L (fi) 2008-12-16
WO2008152196A1 (fr) 2008-12-18
FI20075452A0 (sv) 2007-06-15

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Pikulik 1.1 Approach Flow System The forming process is preceded by an approach flow system that receives the aqueous fiber suspension, or stock, and prepares it for the forming process. Fibres are produced using kraft process or other pulping/bleaching processes (see Bleaching of wood pulps) and the proportions of fibers from different sources are blended here. Drained water from the forming process, known as whitewater, contains useful fibrous material and is continuously recycled back into the stock. Screens and centrifugal cleaners in the approach flow system remove oversize and heavy contaminants from the pulp. Additives such as minerals, pigments and dyes are introduced to make particular grades of paper and paper board. Air bubbles may be removed from the pulp suspension. The mass concentration, or consistency, of the suspension is kept low to prevent fibre flocculation prior to forming and is usually adjusted to a value in the range of 0.5 to 1.5%.
Pikulik [$ Papridry^{TM} $], A New Technique for Drying of Paper and Board

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