CA2320199A1 - Application of a layer of admixture in the web former unit of a board machine - Google Patents
Application of a layer of admixture in the web former unit of a board machine Download PDFInfo
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- CA2320199A1 CA2320199A1 CA002320199A CA2320199A CA2320199A1 CA 2320199 A1 CA2320199 A1 CA 2320199A1 CA 002320199 A CA002320199 A CA 002320199A CA 2320199 A CA2320199 A CA 2320199A CA 2320199 A1 CA2320199 A1 CA 2320199A1
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- Prior art keywords
- layer
- web
- admixture
- combined
- former
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- 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.)
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Classifications
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- 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
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
-
- 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
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- Paper (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Making Paper Articles (AREA)
Abstract
The invention concerns a method for application of a layer of admixture in the web former unit of a board machine. The flow of fresh stock (11) is divided into at least two component stock flows (121 and 122), of which flows, to at least one component flow (121), which forms a face which will be placed against the face of the layer to be combined with it, at a point (141) before the pump (22), at a point (14a2), and/or at a point (143) after the machine screen, admixtures are added in order to increase the contents of fines in the layers and the bonding strength between the faces, and after this the component flows (121 and 122) are passed into the multi-layer headbox (44) and further into the gap former.
Description
Application of a layer of admixture in the web former unit of a board machine The invention concerns a method for application of a layer of admixture in the web former unit of a board machine.
i0 As is well known, board is almost always made of two or more separate layers. In such a case, the webs formed by two or more wire parts are combined one on top of the other before the press section. In the case of webs produced by means of a conventional fourdrinier wire technique, combining of the surface sides of the webs that are not in contact with the wire does, as a rule, not involve problems, and in 15 such a case the strength between the layers in the Z-direction of the web thus obtained, i.e. the "ply bond", is usually adequate. However, when the conventional fourdrinier wire technique is employed, the running speeds are clearly lower than 1000 metres per minute. As the running speeds of the present-day, newer board machines rise to a level higher than 1000 metres per minute, it is necessary to 20 employ other techniques, for example the gap former technique. In such a case, it becomes a problem that the combination of two or more webs formed in a gap former does not meet the requirements of strength that have been imposed. The bond strength between the different layers in the web is reduced. What is concerned in particular is the Z-direction strength represented by the what is called "scott bond" .
25 The poor strength is contributed to by an inadequate concentration of fines on the faces of the layers to be combined. An adequate concentration of fines on the faces to be combined promotes the ply bond between the faces. It has proved problematic to produce board by means of a machine in which the so-called wire sides are combined one against the other. This would be the case always if all the web 30 formers were gap formers. This problem sometimes also occurs in combining of webs formed both by means of a hybrid former and by means of a fourdrinier wire.
WO 99/x0256 PCT/FI99/00075 Attempts have been made to solve the problem, among other things, by spraying starch as a solution or by spraying some other auxiliary agent that increases the bond strength directly onto the web or by introducing a thin layer of extensively ground cellulosic pulp, for example, from a separate headbox, i.e. from a secondary headbox, onto one of the webs to be combined. One mode has been to grind the stock to be passed to one of the layers to an extent clearly higher than normal.
In the following, some prior-art solutions will be described in more detail.
In the FI Patent No. 71,377, a method for manufacture of mufti-layer board is described, in which method the stock suspension that forms one of the surface layers is fed onto the horizontal portion of the first wire. Between the layers, a third stock suspension, which forms the intermediate layer, is fed, ahead of the wedge-like gap that is formed by the second wire, onto the web layer that was already formed.
After this, the first wire and both of the web layers are passed into contact with the third wire, onto whose horizontal portion the stock suspension is fed which forms the other surface layer. The consistency of the stock suspension that forms the inter-mediate layer is considerably higher than the consistencies of the stock suspensions that form the surface layers.
In the US Patent No. 5, 607, 555, a paper machine for manufacture of mufti-layer paper is described. In this machine, there are at least two twin-wire formers, which produce a mufti-layer paper web, in which connection a paper is obtained whose properties on both faces are equal.
In the Finnish Patent No. 92, 729, a stock feed system for a mufti-layer headbox and a method in the operation of a mufti-layer headbox are described. In this solution, into each inlet header in the mufti-layer headbox, a stock produced out of the same fresh stock is introduced, to which stock the necessary chemicals and fillers have been added.
i0 As is well known, board is almost always made of two or more separate layers. In such a case, the webs formed by two or more wire parts are combined one on top of the other before the press section. In the case of webs produced by means of a conventional fourdrinier wire technique, combining of the surface sides of the webs that are not in contact with the wire does, as a rule, not involve problems, and in 15 such a case the strength between the layers in the Z-direction of the web thus obtained, i.e. the "ply bond", is usually adequate. However, when the conventional fourdrinier wire technique is employed, the running speeds are clearly lower than 1000 metres per minute. As the running speeds of the present-day, newer board machines rise to a level higher than 1000 metres per minute, it is necessary to 20 employ other techniques, for example the gap former technique. In such a case, it becomes a problem that the combination of two or more webs formed in a gap former does not meet the requirements of strength that have been imposed. The bond strength between the different layers in the web is reduced. What is concerned in particular is the Z-direction strength represented by the what is called "scott bond" .
25 The poor strength is contributed to by an inadequate concentration of fines on the faces of the layers to be combined. An adequate concentration of fines on the faces to be combined promotes the ply bond between the faces. It has proved problematic to produce board by means of a machine in which the so-called wire sides are combined one against the other. This would be the case always if all the web 30 formers were gap formers. This problem sometimes also occurs in combining of webs formed both by means of a hybrid former and by means of a fourdrinier wire.
WO 99/x0256 PCT/FI99/00075 Attempts have been made to solve the problem, among other things, by spraying starch as a solution or by spraying some other auxiliary agent that increases the bond strength directly onto the web or by introducing a thin layer of extensively ground cellulosic pulp, for example, from a separate headbox, i.e. from a secondary headbox, onto one of the webs to be combined. One mode has been to grind the stock to be passed to one of the layers to an extent clearly higher than normal.
In the following, some prior-art solutions will be described in more detail.
In the FI Patent No. 71,377, a method for manufacture of mufti-layer board is described, in which method the stock suspension that forms one of the surface layers is fed onto the horizontal portion of the first wire. Between the layers, a third stock suspension, which forms the intermediate layer, is fed, ahead of the wedge-like gap that is formed by the second wire, onto the web layer that was already formed.
After this, the first wire and both of the web layers are passed into contact with the third wire, onto whose horizontal portion the stock suspension is fed which forms the other surface layer. The consistency of the stock suspension that forms the inter-mediate layer is considerably higher than the consistencies of the stock suspensions that form the surface layers.
In the US Patent No. 5, 607, 555, a paper machine for manufacture of mufti-layer paper is described. In this machine, there are at least two twin-wire formers, which produce a mufti-layer paper web, in which connection a paper is obtained whose properties on both faces are equal.
In the Finnish Patent No. 92, 729, a stock feed system for a mufti-layer headbox and a method in the operation of a mufti-layer headbox are described. In this solution, into each inlet header in the mufti-layer headbox, a stock produced out of the same fresh stock is introduced, to which stock the necessary chemicals and fillers have been added.
The prior-art solutions, however, involve a number of significant drawbacks. A
separate headbox that sprays starch or fibre stock is an expensive solution, and its use is confined to relatively low speeds, which remain lower than 1000 metres per minute. The starch jets deteriorate the runnability considerably, they block the wires 5 and felts and contaminate the machines, in which case the equipments have to be stopped and cleaned rather frequently. Thus, the necessary auxiliary agents cannot be added selectively either. In most systems, a number of separate stock lines are needed, in which case the system is rather heavy and expensive to operate.
Grinding of one of the stock layers deteriorates the draining of water clearly, and thereby it 10 deteriorates the runnability and the efficiency of production and increases the costs.
In an attempt to attain speeds higher than 1000 metres per minute, such restrictions cannot be tolerated, and a separate jet of admixture that promotes the binding together of the different layers would not be even possible at these speeds.
15 The method in accordance with the invention for application of a layer of admixture in the web former unit of a board machine, the method for manufacture of board, and the board are mainly characterized in what is stated in the patent claims.
The invention will be described in the following in more detail with reference to 20 some preferred embodiments of the invention illustrated in the figures in the accom-panying drawings, the invention being, however, not supposed to be confined to said embodiments alone.
Fig. 1 illustrates a preferred embodiment of the invention, which is in particular 25 suitable for manufacture of board and in which the stock flow produced out of the same fresh stock is divided into two component flows. To the face that will be placed against the face of the layer to be combined, the necessary admixtures are added in order to increase the fines content in the layer and to promote the bond strength between the faces to an optimal extent at an optimal point. The component 30 flows are passed into a multi-layer headbox and from it into a gap former.
In this way, good properties of formation and strength and good internal bond strength are obtained for the board. Thus, out of the same fresh stock 11, two component flows WO 99/40256 PG"T/FI99/00075 121 and 122 are produced. To the component flow 121, out of which the face will be formed that will be placed against the face of the layer to be combined, at the point 141 before the pump 22, at the point 142 after the pump 22, and/or at the point 143 after the machine screen 33, the admixtures are added in order to increase the fines 5 content in the layer and the bond strength between the faces. After this the compo-nent flows 121 and 122 are passed into the multi-layer headbox 44, which comprises, in the conventional way, inlet headers, a tube manifold connected with each inlet header, an intermediate chamber connected with the tube manifold, a turbulence generator and turbulence tubes, a slice cone after the turbulence generator, and vanes 10 that separate the layers in said slice cone. From the headbox the web is transferred into the former, in which 551 represents the first forming wire, 552 the second forming wire, 661 represents a former roll, and 662 the forming roll.
Fig. 2 illustrates a second preferred embodiment of the invention, in which the stock 15 flow produced out of the same fresh stock is divided into three component flows, of which flows, onto the faces that will be fitted against the faces of the layers to be combined, the necessary admixtures will be added in order to increase the fines contents in the layers and to promote the bond strength between the faces to an optimal extent and at an optimal point. After that, the component flows are passed 20 into a multi-layer headbox and further into a gap former. In this solution, out of the same fresh stock 11, three separate component flows 121, 122 and 123 are formed.
To the faces that are formed on the component flows 121 and 123 and that will be placed against the faces of the layers to be combined, at the points 141 before the pumps 221 and 223, at the points 142 after the pumps 221 and 223, and/or at the 25 points 143 after the machine screens 331 and 333, the admixtures are added in order to increase the fines contents in the layers and the bond strength between the faces.
After this the component flows 121, 122 and 123 are passed into the multi-layer headbox 44 and further into the gap former. As an alternative solution, the admix-tures can be added to one component flow 121, 122 or 123 only.
Fig. 3 shows a preferred combination in accordance with the invention, in which the layer 13 that contains an admixture and that is to be combined is introduced through a twin-layer headbox 441 into a gap former, and the web thus obtained is combined with a second web, which is derived from a normal headbox 442 and from a second gap former. The numeral 551 represents the first forming wire, 552 the second, the third, and 554 represents the fourth forming wire.
Fig. 4 shows a second preferred combination in accordance with the invention, in which the layers 131 and 132 that contain an admixture and that are to be combined are introduced into two separate mufti-layer headboxes, herein twin-layer headboxes 443, 444, and the webs that contain admixtures are passed into gap formers and then 10 combined with each other. When two layers that contain admixtures are combined, a stronger bonding layer is obtained, which is necessary in applications that require higher strength.
Fig. 5 shows a solution in which the outermost layers 133 and 134 of a three-layer 15 headbox 445, which outer layers contain admixtures, operate as bonding layers, with which the stock layers derived from two normal headboxes 446 and 44~ are com-bined. The numerals 551...556 represent the forming wires.
In the solutions in accordance with the invention, it is an essential feature that in the 20 manufacture of board it is possible to employ a gap former in a mufti-layer technique at high speeds of levels higher than 1000 metres per minute. In such a case, the admixture that increases the fines content and/or the bond strength is applied as a layer onto the face that will be placed against the face of the layer to be combined.
Thus, a higher fines content is obtained on the face that will be placed, for example, 25 against the face of a middle layer, in which connection the binding strength and the internal bond strength between the layers are increased. When the solution in accordance with the invention is employed in a 3-layer headbox, it is preferable to feed the admixtures onto the outermost faces. The agents that can be applied in this way as layers are starch, fillers, fines, retention agents, such as polyacrylamide, 30 polyacrylimide, special chemicals, hydrophobifying sizes, and equivalent.
In this solution it is also favourably possible to use the same fresh stock and one basic stock line. Further, it is possible to amend the poor properties of a gap former, to improve the runnability and to help the machine to remain clean. In the solution in accord-ance with the invention, the distribution of the fibre-based fines, fillers and starch in the surface, frame and/or bottom layers of the board is regulated so that the concen-tration of said agents is higher at the face that will be placed against the middle 5 layer. The amount of admixture can be optimized, and so also the location at which it is added, in which way an optimal bond between the layers is obtained. This is also reflected in the printing quality of the product. The admixture or admixtures can be applied as layers on the face to be combined only, or alternatively also on several layers consisting of component flows.
By means of the invention, the face of the web to be combined that will enter into contact with a second web can be made favourably in view of the bond strength.
Thus, said face is already formed in the headbox such that it is favourable in view of bonding properties by means of fines or concentration of starch or equivalent. By 15 means of the order and amount of adding, it is also possible to have a substantial effect on the properties that are desirable in the product or in the process.
Besides the application of admixtures as layers in the way described in the present invention, of course, it is also possible to carry out conventional metering of admixtures in the normal way. Since the present invention permits the use of gap formers in the 20 manufacture of board in stead of the conventional fourdrinier wire technique, no large wire pit is needed, the equipment requires less space, it is possible to use smaller amounts of water, fewer dewatering elements, and it is also possible to run at a higher consistency than in the case of a fourdrinier wire. The method in accordance with the present invention can be employed both in an upper-wire unit 25 and on the what is called frame layer. In the manufacture of some special products, this method can also be substituted for a secondary headbox altogether.
separate headbox that sprays starch or fibre stock is an expensive solution, and its use is confined to relatively low speeds, which remain lower than 1000 metres per minute. The starch jets deteriorate the runnability considerably, they block the wires 5 and felts and contaminate the machines, in which case the equipments have to be stopped and cleaned rather frequently. Thus, the necessary auxiliary agents cannot be added selectively either. In most systems, a number of separate stock lines are needed, in which case the system is rather heavy and expensive to operate.
Grinding of one of the stock layers deteriorates the draining of water clearly, and thereby it 10 deteriorates the runnability and the efficiency of production and increases the costs.
In an attempt to attain speeds higher than 1000 metres per minute, such restrictions cannot be tolerated, and a separate jet of admixture that promotes the binding together of the different layers would not be even possible at these speeds.
15 The method in accordance with the invention for application of a layer of admixture in the web former unit of a board machine, the method for manufacture of board, and the board are mainly characterized in what is stated in the patent claims.
The invention will be described in the following in more detail with reference to 20 some preferred embodiments of the invention illustrated in the figures in the accom-panying drawings, the invention being, however, not supposed to be confined to said embodiments alone.
Fig. 1 illustrates a preferred embodiment of the invention, which is in particular 25 suitable for manufacture of board and in which the stock flow produced out of the same fresh stock is divided into two component flows. To the face that will be placed against the face of the layer to be combined, the necessary admixtures are added in order to increase the fines content in the layer and to promote the bond strength between the faces to an optimal extent at an optimal point. The component 30 flows are passed into a multi-layer headbox and from it into a gap former.
In this way, good properties of formation and strength and good internal bond strength are obtained for the board. Thus, out of the same fresh stock 11, two component flows WO 99/40256 PG"T/FI99/00075 121 and 122 are produced. To the component flow 121, out of which the face will be formed that will be placed against the face of the layer to be combined, at the point 141 before the pump 22, at the point 142 after the pump 22, and/or at the point 143 after the machine screen 33, the admixtures are added in order to increase the fines 5 content in the layer and the bond strength between the faces. After this the compo-nent flows 121 and 122 are passed into the multi-layer headbox 44, which comprises, in the conventional way, inlet headers, a tube manifold connected with each inlet header, an intermediate chamber connected with the tube manifold, a turbulence generator and turbulence tubes, a slice cone after the turbulence generator, and vanes 10 that separate the layers in said slice cone. From the headbox the web is transferred into the former, in which 551 represents the first forming wire, 552 the second forming wire, 661 represents a former roll, and 662 the forming roll.
Fig. 2 illustrates a second preferred embodiment of the invention, in which the stock 15 flow produced out of the same fresh stock is divided into three component flows, of which flows, onto the faces that will be fitted against the faces of the layers to be combined, the necessary admixtures will be added in order to increase the fines contents in the layers and to promote the bond strength between the faces to an optimal extent and at an optimal point. After that, the component flows are passed 20 into a multi-layer headbox and further into a gap former. In this solution, out of the same fresh stock 11, three separate component flows 121, 122 and 123 are formed.
To the faces that are formed on the component flows 121 and 123 and that will be placed against the faces of the layers to be combined, at the points 141 before the pumps 221 and 223, at the points 142 after the pumps 221 and 223, and/or at the 25 points 143 after the machine screens 331 and 333, the admixtures are added in order to increase the fines contents in the layers and the bond strength between the faces.
After this the component flows 121, 122 and 123 are passed into the multi-layer headbox 44 and further into the gap former. As an alternative solution, the admix-tures can be added to one component flow 121, 122 or 123 only.
Fig. 3 shows a preferred combination in accordance with the invention, in which the layer 13 that contains an admixture and that is to be combined is introduced through a twin-layer headbox 441 into a gap former, and the web thus obtained is combined with a second web, which is derived from a normal headbox 442 and from a second gap former. The numeral 551 represents the first forming wire, 552 the second, the third, and 554 represents the fourth forming wire.
Fig. 4 shows a second preferred combination in accordance with the invention, in which the layers 131 and 132 that contain an admixture and that are to be combined are introduced into two separate mufti-layer headboxes, herein twin-layer headboxes 443, 444, and the webs that contain admixtures are passed into gap formers and then 10 combined with each other. When two layers that contain admixtures are combined, a stronger bonding layer is obtained, which is necessary in applications that require higher strength.
Fig. 5 shows a solution in which the outermost layers 133 and 134 of a three-layer 15 headbox 445, which outer layers contain admixtures, operate as bonding layers, with which the stock layers derived from two normal headboxes 446 and 44~ are com-bined. The numerals 551...556 represent the forming wires.
In the solutions in accordance with the invention, it is an essential feature that in the 20 manufacture of board it is possible to employ a gap former in a mufti-layer technique at high speeds of levels higher than 1000 metres per minute. In such a case, the admixture that increases the fines content and/or the bond strength is applied as a layer onto the face that will be placed against the face of the layer to be combined.
Thus, a higher fines content is obtained on the face that will be placed, for example, 25 against the face of a middle layer, in which connection the binding strength and the internal bond strength between the layers are increased. When the solution in accordance with the invention is employed in a 3-layer headbox, it is preferable to feed the admixtures onto the outermost faces. The agents that can be applied in this way as layers are starch, fillers, fines, retention agents, such as polyacrylamide, 30 polyacrylimide, special chemicals, hydrophobifying sizes, and equivalent.
In this solution it is also favourably possible to use the same fresh stock and one basic stock line. Further, it is possible to amend the poor properties of a gap former, to improve the runnability and to help the machine to remain clean. In the solution in accord-ance with the invention, the distribution of the fibre-based fines, fillers and starch in the surface, frame and/or bottom layers of the board is regulated so that the concen-tration of said agents is higher at the face that will be placed against the middle 5 layer. The amount of admixture can be optimized, and so also the location at which it is added, in which way an optimal bond between the layers is obtained. This is also reflected in the printing quality of the product. The admixture or admixtures can be applied as layers on the face to be combined only, or alternatively also on several layers consisting of component flows.
By means of the invention, the face of the web to be combined that will enter into contact with a second web can be made favourably in view of the bond strength.
Thus, said face is already formed in the headbox such that it is favourable in view of bonding properties by means of fines or concentration of starch or equivalent. By 15 means of the order and amount of adding, it is also possible to have a substantial effect on the properties that are desirable in the product or in the process.
Besides the application of admixtures as layers in the way described in the present invention, of course, it is also possible to carry out conventional metering of admixtures in the normal way. Since the present invention permits the use of gap formers in the 20 manufacture of board in stead of the conventional fourdrinier wire technique, no large wire pit is needed, the equipment requires less space, it is possible to use smaller amounts of water, fewer dewatering elements, and it is also possible to run at a higher consistency than in the case of a fourdrinier wire. The method in accordance with the present invention can be employed both in an upper-wire unit 25 and on the what is called frame layer. In the manufacture of some special products, this method can also be substituted for a secondary headbox altogether.
Claims (7)
1. A method for layering of an admixture in a web former unit of a board machine in which two or more webs are formed by means of separate web former units and then combined with one another to form a multi-layer web, characterized in that a flow of fresh stock (11) is divided into at least two component stock flows (12 1 and 12 2) and admixtures are added to at least one component flow (12 1) that will form a face that will be placed against and combined with the face of a web formed by another web former unit in order to increase the contents of fines in the web layers and the bonding strength between the faces to be combined, said admixtures being added at a point (14 1) before a pump (22), at a point (14a2) after the pump (22), and/or at a point (14 3) after a machine screen, and after this the component flows (12 1 and 12 2) are passed into a mufti-layer headbox (44) and further into a gap former.
2. A method as claimed in claim 1, characterized in that the admixture includes starch, fines, fillers, retention agents, hydrophobifying sizes, and special chemicals.
3. A method as claimed in claim 1 or 2, characterized in that the fresh stock flow ( 11 ) is branched into three separate component flows (12 1, 12 2, 12 3), of which the admixtures are added to at least one component flow (12 1).
4. A method as claimed in any of the claims 1 to 3, characterized in that the layering of an admixture takes place in an upper-wire unit.
5. A method for manufacture of board in which two or more webs are formed by means of separate web former units and then combined with one another to form a multi-layer web, characterized in that at least one layer of stock discharged from at least one multi-layer headbox to a gap former includes an admixture and the web formed by means of said gap former is combined with at least one web which is derived from a second combination of a multi-layer headbox or a normal headbox and a gap former.
6. A multi-layer board, characterized in that the board comprises a layer of an admixture that has been prepared by means of at least one multi-layer headbox.
7. A board as claimed in claim 6, characterized in that the admixture includes starch, fines, fillers, retention agents, hydrophobifying sizes, and special chemicals.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI980287 | 1998-02-09 | ||
| FI980287A FI103211B (en) | 1998-02-09 | 1998-02-09 | Layering of additive by a forming machine on a board machine |
| PCT/FI1999/000075 WO1999040256A1 (en) | 1998-02-09 | 1999-02-03 | Application of a layer of admixture in the web former unit of a board machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2320199A1 true CA2320199A1 (en) | 1999-08-12 |
Family
ID=8550764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320199A Abandoned CA2320199A1 (en) | 1998-02-09 | 1999-02-03 | Application of a layer of admixture in the web former unit of a board machine |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1070171B1 (en) |
| JP (1) | JP2002502921A (en) |
| AT (1) | ATE277226T1 (en) |
| AU (1) | AU2280999A (en) |
| BR (1) | BR9907976A (en) |
| CA (1) | CA2320199A1 (en) |
| DE (1) | DE69920426T2 (en) |
| FI (1) | FI103211B (en) |
| WO (1) | WO1999040256A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19903943A1 (en) * | 1999-01-28 | 2000-08-03 | Voith Sulzer Papiertech Patent | Method and device for forming a fibrous web |
| FI105118B (en) * | 1999-05-12 | 2000-06-15 | Valmet Corp | Method for manufacture of paper or cardboard web and a paper or cardboard making machine |
| FI108241B (en) * | 2000-08-10 | 2001-12-14 | Metso Paper Inc | Process for the manufacture of coated fiber web, improved paper or paperboard machine and coated paper or paperboard |
| DE10122047A1 (en) * | 2001-05-07 | 2002-11-14 | Voith Paper Patent Gmbh | Sheet forming device and method |
| US7879192B2 (en) * | 2006-05-22 | 2011-02-01 | Paperchine Inc. | Multiply former apparatus |
| DE102008000778A1 (en) | 2008-03-20 | 2009-09-24 | Voith Patent Gmbh | Headbox for a paper or board machine |
| JP5289882B2 (en) * | 2008-09-30 | 2013-09-11 | 日本製紙株式会社 | Paper manufacturing method |
| JP5584505B2 (en) * | 2010-03-30 | 2014-09-03 | 日本製紙株式会社 | Paper manufacturing method |
| FI126041B (en) * | 2011-09-12 | 2016-06-15 | Stora Enso Oyj | Method for controlling retention and intermediate used in the process |
| EP2784214B1 (en) | 2013-03-28 | 2015-09-16 | Valmet Technologies, Inc. | Feed water supply for a multi-layer headbox |
| DE102015223660A1 (en) * | 2015-11-30 | 2017-06-01 | Voith Patent Gmbh | DEVICE AND METHOD FOR PRODUCING A FIBROUS WEB |
| DE102015223664A1 (en) * | 2015-11-30 | 2017-06-01 | Voith Patent Gmbh | DEVICE AND METHOD FOR PRODUCING A FIBROUS WEB |
| EP3540118B1 (en) * | 2018-03-15 | 2022-11-23 | Valmet Technologies Oy | Fiber web machine and method of forming a multi-ply web |
| FI3540119T3 (en) * | 2018-03-15 | 2023-09-21 | Valmet Technologies Oy | Fiber web machine and method of forming a multi-ply web |
| EP4198197A1 (en) * | 2021-12-20 | 2023-06-21 | Mondi AG | Method for producing a multi-layer packaging paper or board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI92729C (en) * | 1993-10-29 | 1994-12-27 | Valmet Paper Machinery Inc | Multilayer headbox pulp feed system and method in multilayer headbox operation |
-
1998
- 1998-02-09 FI FI980287A patent/FI103211B/en active
-
1999
- 1999-02-03 BR BR9907976-3A patent/BR9907976A/en not_active Application Discontinuation
- 1999-02-03 JP JP2000530660A patent/JP2002502921A/en active Pending
- 1999-02-03 DE DE69920426T patent/DE69920426T2/en not_active Expired - Fee Related
- 1999-02-03 EP EP99902565A patent/EP1070171B1/en not_active Expired - Lifetime
- 1999-02-03 AT AT99902565T patent/ATE277226T1/en not_active IP Right Cessation
- 1999-02-03 CA CA002320199A patent/CA2320199A1/en not_active Abandoned
- 1999-02-03 AU AU22809/99A patent/AU2280999A/en not_active Abandoned
- 1999-02-03 WO PCT/FI1999/000075 patent/WO1999040256A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| ATE277226T1 (en) | 2004-10-15 |
| FI103211B1 (en) | 1999-05-14 |
| DE69920426D1 (en) | 2004-10-28 |
| FI980287A0 (en) | 1998-02-09 |
| BR9907976A (en) | 2000-10-17 |
| DE69920426T2 (en) | 2005-11-17 |
| WO1999040256A1 (en) | 1999-08-12 |
| JP2002502921A (en) | 2002-01-29 |
| EP1070171B1 (en) | 2004-09-22 |
| EP1070171A1 (en) | 2001-01-24 |
| AU2280999A (en) | 1999-08-23 |
| FI103211B (en) | 1999-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |