EP0233058B1 - Method and apparatus of manufacturing multilayer board - Google Patents
Method and apparatus of manufacturing multilayer board Download PDFInfo
- 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
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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.
Landscapes
- Paper (AREA)
- Electroluminescent Light Sources (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
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 |
---|---|---|---|
FI860606A FI75383C (fi) | 1986-02-11 | 1986-02-11 | Foerfarande foer framstaellning av flerskiktskartong. |
FI860606 | 1986-02-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0233058A2 EP0233058A2 (en) | 1987-08-19 |
EP0233058A3 EP0233058A3 (en) | 1989-01-18 |
EP0233058B1 true EP0233058B1 (en) | 1991-11-06 |
Family
ID=8522128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87301007A Expired EP0233058B1 (en) | 1986-02-11 | 1987-02-05 | Method and apparatus of manufacturing multilayer board |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0233058B1 (fi) |
AT (1) | ATE69274T1 (fi) |
DE (1) | DE3774289D1 (fi) |
ES (1) | ES2027688T3 (fi) |
FI (1) | FI75383C (fi) |
Cited By (1)
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)
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)
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 (fi) * | 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 (en) * | 1982-11-16 | 1988-09-21 | Whatman Reeve Angel Plc | Paper and method of making it |
FI71377B (fi) * | 1984-05-11 | 1986-09-09 | Ahlstroem Oy | Foerfarande foer framstaellning av flerskiktskartong |
-
1986
- 1986-02-11 FI FI860606A patent/FI75383C/fi not_active IP Right Cessation
-
1987
- 1987-02-05 EP EP87301007A patent/EP0233058B1/en not_active Expired
- 1987-02-05 AT AT87301007T patent/ATE69274T1/de active
- 1987-02-05 ES ES198787301007T patent/ES2027688T3/es not_active Expired - Lifetime
- 1987-02-05 DE DE8787301007T patent/DE3774289D1/de not_active Expired - Fee Related
Cited By (1)
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 |
---|---|
ES2027688T3 (es) | 1992-06-16 |
FI860606A0 (fi) | 1986-02-11 |
EP0233058A2 (en) | 1987-08-19 |
FI860606A (fi) | 1987-08-12 |
ATE69274T1 (de) | 1991-11-15 |
FI75383B (fi) | 1988-02-29 |
DE3774289D1 (de) | 1991-12-12 |
FI75383C (fi) | 1988-06-09 |
EP0233058A3 (en) | 1989-01-18 |
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