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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 8
- 239000010410 layer Substances 0.000 claims description 54
- 239000002344 surface layer Substances 0.000 claims description 12
- 238000009950 felting Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 210000000481 breast Anatomy 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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)
Abstract
Description
- 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.
- When manufacturing multilayer boards, layers of different qualities are used. 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.
- With multilayer board machines in which several pulp layers are bonded by wet pressing, a strong and rigid packaging board that has good printing qualities and a grammage of 200-600 g/m² can be produced with low costs for raw materials.
- 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. In addition, a plurality of cylinder moulds are needed if the board is required to be very thick.
- Fourdrinier wire 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.
- In the closest known prior art WO 85/05387 of A. Ahlstrom Corporation there is disclosed a method for manufacturing multilayer board in which the pulp suspension forming a surface layer 12 is fed onto the horizontal section of a first, inner wire 1. The pulp suspension forming an intermediate layer 11 is supplied onto said web layer, which is already formed, in or in front of a
tapering gap 6 constituted by the first wire and a second,outer wire 4. Both of the wires and the web layers 11, 12 between them are guided over a curved surface 3. After this the first wire and both of the web layers are guided against a third,lower wire 8 onto the horizontal section of which the pulp suspension forming the other surface layer 13 is supplied. The consistency of the pulp suspension forming the intermediate layer 11 is higher than that of the pulp suspensions forming the surface layers. Mention is made onpage 4 of this document of the possibility of the provision of a fourth headbox between the turning roll 7 and the headbox 14 on the lower wire 8 (or theheadboxes 9 and 10) to supply another intermediate layer on the horizontal section of thelower wire 8 although the nature of the fourth headbox is not specifically mentioned. In this arrangement the formation of one or two layers on alower wire 8 naturally requires apparatus for such and consequentially has a greater space requirement in the lower region of the apparatus. - 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.
- Also according to the present invention there is provided 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.
- The invention will be described further, by way of example, with reference to the accompanying drawing which is a schematic illustration of a section of a web forming section in a board machine according to the invention.
- 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. After the forming roll 3 both wires run diagonally downwards and thesecond wire 4 is detached from the first wire. Under the horizontal section of the first wire 1 are disposed known (not shown), 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. When the slice spray reaches the wire at this consistency, 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. During the web formation 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 theheadboxes 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 andsecond wires 1 and 4 and which operates at a normal consistency range. The web layers on the forming roll 3 are pressed between thewires 1 and 4 and due to the centrifugal force water is drained upwards through thewire 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. Thus a 4-ply board with a grammage of ca. 600 g/m² can be manufactured on a relatively short twin wire former. - The invention is not only limited to the described embodiment presented as example, but several modifications and applications may be made of it within the scope of the invention concept defined by the appended claims.
- It will be understood by persons skilled in the art that the term "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.
Claims (5)
- 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 layer between the two intermediate high consistency headboxes is smoothed by a dandy roll.
- A method according to claim 1 characterised in that the stock consistency is 2 - 4%.
- A method according to claims 1 or 2 characterised in that the grammage of each of the pulp layers is 100 - 300 g/m².
- A method according to any one of claims 1 to 3 characterised in that the high consistency pulp layers form the core of the multilayer board.
- An apparatus for manufacturing a multilayer board according to the method of claim 1, wherein headboxes (6, 7, 8, 10) are disposed on a fourdrinier wire (1) for forming superposed pulp layers with two of the headboxes (6, 10) being provided to supply two surface layers formed from low consistency stock and with two of the headboxes (7, 8) being intermediate headboxes (7, 8) for feeding intermediate high consistency stock layers between said two surface layers, wherein the two intermediate headboxes (7, 8) are such that the stock consistency supplied thereby is so high that, in a slice channel of the intermediate headboxes (7, 8) 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 (1) in relation to one another, and that dewatering of the high consistency layers takes place through the wire; and wherein a single wire (1) is provided for the support of the superposed layers, and a dandy roll (9) is provided between the two intermediate high consistency headboxes (7, 8) to act to smooth the formed pulp layer between said headboxes (7, 8).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87301007T ATE69274T1 (en) | 1986-02-11 | 1987-02-05 | METHOD AND EQUIPMENT FOR MANUFACTURING MULTI-LAYER BOARDBOARD. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI860606 | 1986-02-11 | ||
FI860606A FI75383C (en) | 1986-02-11 | 1986-02-11 | Process for making multi-layer board. |
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 (en) |
AT (1) | ATE69274T1 (en) |
DE (1) | DE3774289D1 (en) |
ES (1) | ES2027688T3 (en) |
FI (1) | FI75383C (en) |
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 (en) * | 1986-09-24 | 1988-04-14 | Krupp Gmbh | Power supply device for a three-phase plasma torch unit |
CA2066811A1 (en) * | 1991-04-23 | 1992-10-24 | Dinkar G. Wagle | Method of producing multi-ply paper and board products exhibiting increased stiffness |
EP1218592B1 (en) | 1999-09-06 | 2004-11-10 | Metso Paper, Inc. | 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 (en) * | 2002-05-25 | 2003-12-04 | Voith Paper Patent Gmbh | A forming apparatus |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1136198B (en) * | 1962-09-06 | Saint Anne S Board Mill Compan | Device for producing a multilayer paper, cardboard or similar fibrous web | |
US2286942A (en) * | 1939-07-11 | 1942-06-16 | Int Paper Co | Method of manufacturing paper and/or board |
JPS513203Y2 (en) * | 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 (en) * | 1984-05-11 | 1986-09-09 | Ahlstroem Oy | FOERFARANDE FOER FRAMSTAELLNING AV FLERSKIKTSKARTONG |
-
1986
- 1986-02-11 FI FI860606A patent/FI75383C/en not_active IP Right Cessation
-
1987
- 1987-02-05 AT AT87301007T patent/ATE69274T1/en active
- 1987-02-05 EP EP87301007A patent/EP0233058B1/en not_active Expired
- 1987-02-05 DE DE8787301007T patent/DE3774289D1/en not_active Expired - Lifetime
- 1987-02-05 ES ES198787301007T patent/ES2027688T3/en not_active Expired - Lifetime
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 |
---|---|
EP0233058A3 (en) | 1989-01-18 |
EP0233058A2 (en) | 1987-08-19 |
DE3774289D1 (en) | 1991-12-12 |
FI860606A (en) | 1987-08-12 |
FI75383B (en) | 1988-02-29 |
ES2027688T3 (en) | 1992-06-16 |
FI860606A0 (en) | 1986-02-11 |
ATE69274T1 (en) | 1991-11-15 |
FI75383C (en) | 1988-06-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5635033A (en) | Paper machine for the manufacture of a multi-layer paper web | |
GB2094364A (en) | Methods and apparatus for forming a multi-layered paper web | |
US2881669A (en) | Paper or board product | |
US5468348A (en) | Multi-ply web former and method | |
CN112585317A (en) | Method and machine for producing a multi-layer fibrous web | |
EP0233058B1 (en) | Method and apparatus of manufacturing multilayer board | |
EP0332618B1 (en) | Method of making soft paper | |
CA2151645C (en) | Hybrid former for a paper machine | |
US6413369B2 (en) | Arrangement and method for forming a multilayered paper or paperboard web | |
US6254728B1 (en) | Method and machine for manufacturing a fibrous pulp web | |
EP0211840B1 (en) | Method for manufacturing multilayer board | |
US5935382A (en) | Method and board machine for manufacturing a paperboard web | |
AU778169B2 (en) | Arrangement and method for forming a multilayered paper or paperboard web | |
GB2073798A (en) | Paper machine having a drainage cylinder | |
CA2383863C (en) | Board machine and method of manufacturing a multilayer cardboard web | |
JPH06280185A (en) | Papermaking apparatus and multilayer paper forming apparatus | |
CA2253831A1 (en) | A method and board machine for manufacturing a paperboard web | |
EP0153288A2 (en) | Forming roll apparatus | |
US7300553B2 (en) | Arrangement for a wire section of a paper or board machine | |
JPH0346595B2 (en) | ||
WO1993025753A1 (en) | Rotary former for manufacturing paper | |
EP0465698A1 (en) | Multi-ply web former and method | |
JPH07116678B2 (en) | Twin wire paper machine | |
CN115023519A (en) | Equipment for manufacturing white kraft liner board and application of equipment for manufacturing white kraft liner board | |
EP1452642A1 (en) | Device for producing a fibrous web |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT DE ES FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
17P | Request for examination filed |
Effective date: 19881011 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT DE ES FR GB IT SE |
|
17Q | First examination report despatched |
Effective date: 19890706 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VALMET-KARHULA INC. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE ES FR GB IT SE |
|
REF | Corresponds to: |
Ref document number: 69274 Country of ref document: AT Date of ref document: 19911115 Kind code of ref document: T |
|
ITF | It: translation for a ep patent filed | ||
REF | Corresponds to: |
Ref document number: 3774289 Country of ref document: DE Date of ref document: 19911212 |
|
ET | Fr: translation filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19920110 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19920115 Year of fee payment: 6 Ref country code: AT Payment date: 19920115 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19920120 Year of fee payment: 6 Ref country code: DE Payment date: 19920120 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19920219 Year of fee payment: 6 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2027688 Country of ref document: ES Kind code of ref document: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19930205 Ref country code: AT Effective date: 19930205 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19930206 Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19930206 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19930205 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19931029 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19931103 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
EUG | Se: european patent has lapsed |
Ref document number: 87301007.8 Effective date: 19930912 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 19990201 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050205 |