EP0233058B1 - Verfahren und Einrichtung zur Herstellung von mehrschichtigem Karton - Google Patents

Verfahren und Einrichtung zur Herstellung von mehrschichtigem Karton Download PDF

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Publication number
EP0233058B1
EP0233058B1 EP87301007A EP87301007A EP0233058B1 EP 0233058 B1 EP0233058 B1 EP 0233058B1 EP 87301007 A EP87301007 A EP 87301007A EP 87301007 A EP87301007 A EP 87301007A EP 0233058 B1 EP0233058 B1 EP 0233058B1
Authority
EP
European Patent Office
Prior art keywords
layers
headboxes
pulp
wire
consistency
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP87301007A
Other languages
English (en)
French (fr)
Other versions
EP0233058A3 (en
EP0233058A2 (de
Inventor
Tapio Waris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Karhula 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 Valmet Karhula Inc filed Critical Valmet Karhula Inc
Priority to AT87301007T priority Critical patent/ATE69274T1/de
Publication of EP0233058A2 publication Critical patent/EP0233058A2/de
Publication of EP0233058A3 publication Critical patent/EP0233058A3/en
Application granted granted Critical
Publication of EP0233058B1 publication Critical patent/EP0233058B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the present invention relates to a method of manufacturing a multilayer board web, wherein superposed pulp layers are formed by headboxes disposed on a fourdrinier wire with two intermediate headboxes feeding intermediate high consistency stock layers being fed between two surface layers formed by headboxes providing low consistency stock layers; and wherein the consistency of the high consistency stock layers is so high that, in a slice channel of the intermediate headboxes or after the stock has been discharged from each intermediate headbox slice, the forming pulp layers reach such a degree of felting that the fibres of the pulp cannot significantly move on the wire in relation to one another, and that dewatering of the high consistency layers takes place through the wire, and to an apparatus therefor.
  • the core layer that gives sturdiness and rigidity to the board is often manufactured from pulps made of waste paper, whilst the surface layers or at least one surface layer is usually made from bleached pulp of better quality.
  • a very old method of manufacturing multilayer board involves manufacturing the layers with cylinder moulds.
  • the driving speed of cylinder moulds is, however, relatively slow and high stock consistencies cannot be used in them which thus involves large dewatering quantities.
  • a plurality of cylinder moulds are needed if the board is required to be very thick.
  • Multiwire fourdrinier machines can be driven at higher speeds than cylinder moulds and the sheet formation can be better controlled in them. Multiwire fourdrinier machines are most suitable when manufacturing thin board qualities. High investment and running costs, however, limit the use of these machines.
  • the main object of the present invention is to provide a method of manufacturing high grammage (500 - 700 g/m2) multilayer board with simple means.
  • This is achieved according to the present invention by the provision of a method of manufacturing a multilayer board web, wherein superposed pulp layers are formed by headboxes disposed on a fourdrinier wire with two intermediate headboxes feeding intermediate high consistency stock layers being fed between two surface layers formed by headboxes providing low consistency stock layers; and wherein the consistency of the high consistency stock layers is so high that, in a slice channel of the intermediate headboxes or after the stock has been discharged from each intermediate headbox slice, the forming pulp layers reach such a degree of felting that the fibres of the pulp cannot significantly move on the wire in relation to one another, and that dewatering of the high consistency layers takes place through the wire; wherein the pulp layers are formed on a single wire, and the formed pulp layers between the two intermediate high consistency headboxes is smoothed by a dandy roll.
  • an apparatus for manufacturing a multilayer board according to the method of claim 1, wherein headboxes are disposed on a fourdrinier wire for forming superposed pulp layers with two of the headboxes being provided to form two surface layers formed from low consistency stock and with two of the headboxes being intermediate headboxes for feeding intermediate high consistency stock layers between said two surface layers, wherein the two intermediate headboxes are such that the stock consistency supplied thereby is so high that, in a slice channel of the intermediate headboxes or after the stock has been discharged from each intermediate headbox slice, the forming pulp layers reach such a degree of felting that the fibres of the pulp cannot significantly move on the wire in relation to one another, and that dewatering of the high consistency layers takes place through the wire; and wherein a single wire is provided for the formation of the superposed layers, and a dandy roll is provided between the two intermediate high consistency headboxes to act to smooth the formed pulp layer between said headboxes.
  • a web forming section of a board machine is illustrated in Fig. 1 and is a twin wire former comprising a first wire arrangement or first wire 1 having a main run which generally extends horizontally from a breast roll 2 to a forming roll 3 and a second wire arrangement or wire 4 which forms with the first wire a gap 5 that tapers towards the forming roll.
  • first wire arrangement or first wire 1 having a main run which generally extends horizontally from a breast roll 2 to a forming roll 3 and a second wire arrangement or wire 4 which forms with the first wire a gap 5 that tapers towards the forming roll.
  • the second wire 4 is detached from the first wire.
  • wire supporting dewatering devices such as vacuum boxes and foils which effect dewatering downwardly through the wire.
  • the stock forming the first outer ply of the board is fed onto the first wire 1 by a headbox 6 which is disposed at the breast roll 2 and operates at a normal consistency range of 0.1 to 1.2%.
  • the layers forming the core of the multilayer board are produced by feeding stock onto the wire on top of the already formed web layer by two intermediate high consistency headboxes 7 and 8 disposed at a distance from each other in which the stock consistency is substantially higher than the normal headbox consistency, e.g. 3%.
  • a headbox of this type is described in e.g. Finnish Patent Publication No. 56221.
  • the drainage of the pulp does not take place in the same way as at a normal headbox consistency, but rather the web is formed in such a way that the fibres form a continuous network across the whole thickness of the web in the slice channel of the headbox or immediately after it.
  • the web structure becomes felted and there is a relatively strong z-orientation of the fibres in the web.
  • the structure of a web formed at a normal consistency is on the contrary stratified.
  • the felted structure remains more open than the stratified structure which means that dewatering of such a web is easier than that of a web formed at a normal consistency which again makes it possible to drain water from the pulp layer formed by the headbox 8 downwards through the pulp layer formed by the headbox 7. Since the quantity of water to be drained from the pulp layers is considerably smaller than that to be drained from pulp layers formed at a normal consistency, both layers can be thick and a thick core can be produced by two headboxes. Due to the fibre orientation, the core also has a higher bulk than a core formed at a normal consistency.
  • the web formation of a multilayer board can be improved by treating the web by means of a dandy roll 9 disposed between the headboxes 7 and 8.
  • the second thin outer ply is supplied by a headbox 10 which is disposed in front of the gap formed by the first and second wires 1 and 4 and which operates at a normal consistency range.
  • the web layers on the forming roll 3 are pressed between the wires 1 and 4 and due to the centrifugal force water is drained upwards through the wire 4. Subsequently the thus formed 4-ply web is guided by known methods to the press and dryer sections of a board manufacturing machine for further treatment.
  • the stock consistency in the high consistency headboxes 7 and 8 is 1.5 - 6% or higher, preferably 2 - 4%.
  • the grammage of the core layers formed at a high consistency can be 100 - 300 g/m2 or higher, preferably 150 - 250 g/m2.
  • a 4-ply board with a grammage of ca. 600 g/m2 can be manufactured on a relatively short twin wire former.
  • fourdrinier wire throughout the specification and claims, relates to and is generally understood to mean an endless belt arrangement as is used in fourdrinier machines which is sometimes referred to as a "cloth” and which may, e.g. be made of a wire mesh (mesh of metal filaments) or of a plastics material mesh.

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  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electroluminescent Light Sources (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)

Claims (5)

  1. Verfahren zur Herstellung einer mehrschichtigen Pappbahn, worin übereinanderliegende Pulpeschichten durch Stoffauflaufkästen gebildet werden, die an einem Fourdrinier-Drahtnetz angeordnet sind, wobei zwei Zwischenstoffauflaufkästen Zwischenstoffschichten hoher Stoffdichte zuführen, die zwischen zwei Oberflächenschichten zugeführt werden, die durch Stoffauflaufkästen gebildet werden, die Stoffschichten niedriger Stoffdichte vorsehen; und worin die Stoffdichte der Stoffschichten hoher Stoffdichte so hoch ist, daß in einem Staukanal der Zwischenstoffauflaufkästen, oder nachdem der Stoff von jeder Stauvorrichtung der Zwischenstoffauflaufkästen abgelassen ist, die formenden Pulpeschichten einen solchen Filzgrad erreichen, daß sich die Fasern der Pulpe auf dem Drahtnetz gegeneinander nicht wesentlich bewegen können, und daß die Entwässerung der Schichten hoher Stoffdichte entlang des Drahtnetzes stattfindet, wobei die Pulpeschichten auf einem einzelnen Drahtnetz ausgebildet werden und die zwischen den beiden Zwischenstoffauflaufkästen hoher Stoffdichte ausgebildete Pulpeschicht durch eine Druckrolle geglättet wird.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Stoffdichte 2 bis 4 % beträgt.
  3. Verfahren nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß
    das Quadratmetergewicht jeder Pulpeschicht 100 - 300 g/m² beträgt.
  4. Verfahren nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, daß
    die Pulpeschichten hoher Stoffdichte den Kern der mehrschichtigen Pappe bilden.
  5. Vorrichtung zum Herstellen mehrschichtiger Pappe nach dem Verfahren nach Anspruch 1, bei der Stoffauflaufkästen (6, 7, 8, 10) an einem Fourdrinier-Drahtnetz (1) angeordnet sind, um übereinanderliegende Pulpeschichten auszubilden, wobei zwei der Stoffauflaufkästen (6, 10) vorgesehen sind, um zwei Oberflächenschichten zuzuführen, die aus Stoff niedriger Stoffdichte gebildet sind, und wobei zwei der Stoffauflaufkästen (7, 8) Zwischenstoffauflaufkästen (7, 8) sind, die Zwischenstoffschichten hoher Stoffdichte zwischen den beiden Oberflächenschichten zuführen, wobei die beiden Zwischenstoffauflaufkästen (7, 8) derart sind, daß die durch diese zugeführte Stoffdichte so hoch ist, daß in einem Staukanal der Zwischenstoffauflaufkästen (7, 8) oder nachdem der Stoff von jeder Stauvorrichtung der Zwischenstoffauflaufkästen abgelassen ist, die bildenden Pulpeschichten einen solchen Filzgrad erreichen, daß sich die Fasern der Pulpe auf dem Drahtnetz (1) gegeneinander nicht nennenswert bewegen können, und daß die Entwässerung der Schichten hoher Stoffdichte entlang des Drahtnetzes stattfindet; und wobei ein einzelnes Drahtnetz (1) als Unterlage für die übereinanderliegenden Schichten vorgesehen ist, und wobei eine Druckrolle (9) zwischen den beiden Zwischenstoffauflaufkästen (7, 8) hoher Stoffdichte vorgesehen ist, um die zwischen den Stoffauflaufkästen (7, 8) gebildete Pulpeschicht zu glätten.
EP87301007A 1986-02-11 1987-02-05 Verfahren und Einrichtung zur Herstellung von mehrschichtigem Karton Expired EP0233058B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87301007T ATE69274T1 (de) 1986-02-11 1987-02-05 Verfahren und einrichtung zur herstellung von mehrschichtigem karton.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI860606 1986-02-11
FI860606A FI75383C (fi) 1986-02-11 1986-02-11 Foerfarande foer framstaellning av flerskiktskartong.

Publications (3)

Publication Number Publication Date
EP0233058A2 EP0233058A2 (de) 1987-08-19
EP0233058A3 EP0233058A3 (en) 1989-01-18
EP0233058B1 true EP0233058B1 (de) 1991-11-06

Family

ID=8522128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87301007A Expired EP0233058B1 (de) 1986-02-11 1987-02-05 Verfahren und Einrichtung zur Herstellung von mehrschichtigem Karton

Country Status (5)

Country Link
EP (1) EP0233058B1 (de)
AT (1) ATE69274T1 (de)
DE (1) DE3774289D1 (de)
ES (1) ES2027688T3 (de)
FI (1) FI75383C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5935382A (en) * 1996-05-31 1999-08-10 Valmet-Karlstad Ab Method and board machine for manufacturing a paperboard web

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3632425C1 (de) * 1986-09-24 1988-04-14 Krupp Gmbh Stromversorgungsvorrichtung fuer eine Drehstrom-Plasmabrennereinheit
CA2066811A1 (en) * 1991-04-23 1992-10-24 Dinkar G. Wagle Method of producing multi-ply paper and board products exhibiting increased stiffness
AU7045900A (en) 1999-09-06 2001-04-10 Metso Paper Karlstad Ab Board machine and method of manufacturing a multilayer cardboard web
US6699361B1 (en) 1999-09-07 2004-03-02 Metso Paper Karlstad Ab Papermaking device for producing a multilayer liner and associated methods
DE10223398A1 (de) * 2002-05-25 2003-12-04 Voith Paper Patent Gmbh Blattbildungsvorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1136198B (de) * 1962-09-06 Saint Anne S Board Mill Compan Vorrichtung zum Herstellen einer mehrschichtigen Papier-, Karton- od. dgl. Faserstoffbahn
US2286942A (en) * 1939-07-11 1942-06-16 Int Paper Co Method of manufacturing paper and/or board
JPS513203Y2 (de) * 1972-02-29 1976-01-30
US4021295A (en) * 1975-05-05 1977-05-03 Beloit Corporation Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web
GB2041030A (en) * 1979-02-02 1980-09-03 St Annes Board Mill Co Ltd Compound Paper
EP0109282B1 (de) * 1982-11-16 1988-09-21 Whatman Reeve Angel Plc Papier und Verfahren zu dessen Herstellung
FI71377B (fi) * 1984-05-11 1986-09-09 Ahlstroem Oy Foerfarande foer framstaellning av flerskiktskartong

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5935382A (en) * 1996-05-31 1999-08-10 Valmet-Karlstad Ab Method and board machine for manufacturing a paperboard web

Also Published As

Publication number Publication date
DE3774289D1 (de) 1991-12-12
FI75383C (fi) 1988-06-09
ES2027688T3 (es) 1992-06-16
FI75383B (fi) 1988-02-29
EP0233058A3 (en) 1989-01-18
FI860606A (fi) 1987-08-12
FI860606A0 (fi) 1986-02-11
ATE69274T1 (de) 1991-11-15
EP0233058A2 (de) 1987-08-19

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