CA2285440A1 - Method and device for the production of fibre panels - Google Patents
Method and device for the production of fibre panels Download PDFInfo
- Publication number
- CA2285440A1 CA2285440A1 CA002285440A CA2285440A CA2285440A1 CA 2285440 A1 CA2285440 A1 CA 2285440A1 CA 002285440 A CA002285440 A CA 002285440A CA 2285440 A CA2285440 A CA 2285440A CA 2285440 A1 CA2285440 A1 CA 2285440A1
- Authority
- CA
- Canada
- Prior art keywords
- process according
- dewatering
- zone
- wedge
- wire
- 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.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
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- Paper (AREA)
Abstract
The present invention relates to a method for producing fibre panels, wherein said invention is mainly characterised in that a fibre suspension is dehydrated from both sides between a pair of sieves or felt units (10, 11).
This invention also relates to a device for implementing said method, wherein said device comprises an upper sieve (11) arranged in the main dehydration area (9).
This invention also relates to a device for implementing said method, wherein said device comprises an upper sieve (11) arranged in the main dehydration area (9).
Description
Process and a device for the formation of fiber board The invention relates to a process and a device for the formation of fiber board.
The classic fiberboard production process is the so-called "wet process".
This is the preferred ecological production method because the fiber s board can be produced with virtually no chemical bonding agents. The alternatives are a dry process for production of particle board and the MDF (medium-density fiberboard) process, which is also a dry process.
The current wet process technology is several decades old. It is ineffective in many process stages and has virtually no means of being regulated. The fibers are reduced in size in a pressurized refiner. Since no (or only very small quantities o~ bonding agents are used, the fibers must develop sufficient bonding capacity during the refining process.
The principle of web formation used to date on Fourdrinier machines does have some disadvantages. The present headbox technology does not 15 meet the requirements in terms of formation and calibration of the board thickness. Furthermore, web formation according to the Fourdrinier principle requires a vacuum as driving force for the greater part of the water to be removed. This means that the energy consumption of a typical plant is approximately 150 kW. Since the web dewaters to one 2o side, the machine required has to be very long.
In order to avoid the disadvantage of the chemical bonding agents used in dry processes, the aim is to improve the wet process used to date.
The invention is thus characterized by the fiber stock suspension being dewatered on two sides between wires or felts. The energy consumption 2s can be greatly reduced as a result because there is no vacuum required.
2388 AT-engl A further development of the invention is characterized by dilution water being added locally in order to regulate the board thickness across the web running direction. This is a simple means of evening out the board thickness without requiring a great deal of design work. The thickness is s then regulated on the basis of the final board thickness measured.
A favorable configuration of the invention is characterized by headbox lips being set locally to regulate the board thickness across the web running direction. The board thickness can be set approximately using these headbox lips, with a more precise board thickness being obtained in ~o combination with the dilution water.
A favorable further development of the invention is characterized by pre-dewatering taking place in a wedge zone. Due to the rising pressure in the wedge zone, even dewatering to a high consistency can be achieved quickly over a short length and without applying a vacuum, where the 15 board thickness can be influenced accordingly by using an adjustable wedge zone.
An advantageous further development of the invention is characterized by the stock being distributed over the working width by means of a cross-flow distributor and by part of the fiber stock suspension flow being 2o returned to the headbox. The optimum basis weight cross-profile can be set as a result of this suspension being returned to the headbox.
An advantageous configuration of the invention is characterized by the process dewatering to a dry content of more than 40%, preferably more than 45%. As a result, there is a drop in subsequent pressing time in the 2s hot press (providing a higher throughput), in the amount of heavily loaded filtrate produced during hot pressing, and in the amount of steam needed to evaporate the residual water.
2388 AT-engl A favorable configuration of the invention is characterized by a top layer being applied after pre-dewatering, with vacuum extraction possibly also being provided in the area where the top layer is applied. Thus, it is possible to obtain good fiberboard surface properties by using small s amounts of high-grade fibers without having to alter the composition or quality of the rest of the board.
A favorable further development of the invention is characterized by further dewatering in a wedge zone after the top layer has been applied.
As a result, the entire web, including the top layer, can be dewatered well.
o An advantageous further development of the invention is characterized by several points being provided with line pressure, for example two to six, preferably three to five. A particularly high final dry content can be achieved as a result.
The invention also refers to a forming device for fiberboard.
15 This device is characterized by a top wire being provided in the main dewatering zone. With the top wire added, the web can dewater on two sides, virtually halving the dewatering paths, which can also substantially shorten the length of the machine.
An advantageous further development of the invention is characterized by 2o the top wire forming a wedge zone together with the bottom wire. As a result, high and controlled pressing force can be applied to the pulp web, which means that no vacuum is required later for dewatering purposes.
A favorable configuration of the invention is characterized by the wedge zone being of adjustable design. With this adjustable wedge zone, the 2s board thickness can be set particularly well.
2388 AT-engl An advantageous configuration of the invention is characterized by the bottom wire running essentially horizontally as this limits any disadvantageous effects of gravity.
A favorable further development of the invention is characterized by the wire or felt in the wedge zone being supported by perforated plastic or 'steel plates, foil strips or table rolls. Only by using a top wire according to the invention is it possible to exploit the advantages of the variants mentioned.
A favorable configuration of the invention is characterized by a second headbox being provided in order to apply a top layer.
An advantageous configuration of the invention is characterized by the wedge zones being suitable for pressure loading at the end, which means that the maximum dry content can be obtained after pre-dewatering, regardless of the board thickness to be produced and thus, the web ~5 undergoes optimum preparation for the subsequent press zone.
A favorable further development of the invention is characterized by several press nips being provided, particularly two to six, preferably between three and five, with the press rolls being arranged almost vertically above one another. This achieves a particularly high final dry 2o content.
A favorable further development of the invention is characterized by the press rolls in the press nips being suitable for individual pressure loading.
As a result, the final dry content and the dewatering curve can be controlled effectively.
25 A favorable configuration of the invention is characterized by the machine frame being suitable for cantilevering. This allows the use of endless woven wires, which provide a longer service life at high pressing forces.
2388 AT-engl The invention will now be described in examples and referring to the drawings, where Figure 1 shows a side view of a state-of the-art plant, Fig. 2 shows a horizontal projection of Fig. 1, Fig. 3 shows a side view of a plant s according to the invention, Fig. 4 shows a section through the line marked IV-IV in Fig. 3, Fig. 5 a section through the line marked V-V in Fig. 3, and Fig. 6 provides a sectional view of a headbox.
Figure 1 shows a side view of a Fourdrinier plant 1, with a gravity dewatering zone 2, where the web is guided over rolls 3. Adjoining this is a zone with vacuum rolls 4, where the greater part of the water is extracted from the web. After this zone, more water is pressed out of the web by rolls 5 and 6 mounted in pairs. A typical Fourdrinier plant according to the state of the art is approximately 14 m long for a throughput of 180 tonnes/day.
15 Figure 2 shows the horizontal projection, illustrating the large number of rolls 3 required, as well as the vacuum rolls 4 and the press rolls 5 and 6.
This figure also shows the drive motor 7 with the gearbox 8.
Figure 3 illustrates a fiberboard plant according to the invention. It comprises a headbox 22 and an initial dewatering zone 9, where the main 2o dewatering process takes place. This dewatering zone 9 has a bottom wire 10, which runs through the entire plant. It also has a top wire 11 so that the web can dewater in both directions. If no secondary pulp is to be added, there is only one top wire, which also runs through the entire plant.
As a result, the web is dewatered evenly over its entire thickness, which is 2s particularly important in fiber board production. The first dewatering zone is adjoined by a further dewatering zone 12, where more water is extracted from the web by vacuum boxes 13. Since only a comparatively very thin layer is fed in here, the amount of water extracted is very small 2388 AT-engl compared with state-of the-art plants. At the end of this zone 12, a top wire 14 is applied again for further dewatering. This wire 14 also runs through the subsequent press zone 15 with the rolls 16 mounted in pairs.
Here, a final dry content of more than 40% is achieved, preferably more s than 45%, due to the mechanical dewatering process. The headbox 22 used here can be a cross-flow distributor with a diffuser block and a perforated roll to break up the flocks forming in the suspension. The bottom wire 10 runs through the entire plant in an essentially horizontal position. A wedge 17 is formed in the first dewatering zone 9 together with the top wire 11. The wires 10, 11 run over perforated plates 18 here made of plastic or steel. As an alternative, foil strips or table rolls can be used. The gap height can be set at the end 19 of the wedge zone 17 or the wedge zone 17 can be pressure-loaded. A roll 20, driving against the top wire 11, forms the end of the wedge zone. At the dewatering zone 12, a further headbox 23 can be provided for a top layer. In order to dewater the top layer, a further top wire 14 is provided. Dewatering is assisted by extraction using vacuum (through boxes 13). The top wire 14 and the bottom wire 10 form a further wedge zone 21, which is also adjustable and can be designed for pressure-loading at the end of the zone if necessary.
2o In order to increase the final dry content, the press zone 15 contains two to six, preferably three to five, press nips, i.e. pairs of rolls pressed against one another. The present example shows four such roll pairs 16 which form press nips. A plant of this type has an overall length of approximately 11.5 m for a throughput of approximately 320 tonneslday, 2s i.e. although production is increased by approximately 80%, only some 80% of the length required in a state-of-the part plant is needed here.
This provides a specific output of approximately 220% compared with state-of the-art plants.
2388 AT-engl Figure 4 shows a section through the line marked IV-IV in Fig. 3. In this section viewed against the web running direction, the bottom wedge plate 18, a vacuum box 13 and the roll 20 at the end of the wedge zone 17 are all clearly shown. The so-called front side is marked FS and s the rear side, where all of the drives and other leads and lines are located, is marked TS.
Figure 5 shows a section through the same point as Fig. 4, however viewed in the web running direction. Here, the rear and front sides are reversed compared with Fig. 4. In addition to the vacuum box 13 and the wedge plate 18, this illustration also shows the second headbox 23 for the top layer. The suspension to the headbox 23 is fed through a connection pipe 24 coming from the rear side. The water extracted is removed from the vacuum box 13 through a pipe 25.
Figure 6 shows the headbox 22 in detail. The suspension is fed in 15 through a cross-flow distributor 26 and flows through a diffuser block 27 to a perforated roll 28, which breaks down any flocks that have formed in the suspension. From here, it is brought into the wedge zone 17 formed by the top 10 and bottom 11 wires.
The invention is not limited to the examples described. It would also be 2o possible to combine the individual dewatering zones in different ways, depending on the given requirements.
2388 AT-engl
The classic fiberboard production process is the so-called "wet process".
This is the preferred ecological production method because the fiber s board can be produced with virtually no chemical bonding agents. The alternatives are a dry process for production of particle board and the MDF (medium-density fiberboard) process, which is also a dry process.
The current wet process technology is several decades old. It is ineffective in many process stages and has virtually no means of being regulated. The fibers are reduced in size in a pressurized refiner. Since no (or only very small quantities o~ bonding agents are used, the fibers must develop sufficient bonding capacity during the refining process.
The principle of web formation used to date on Fourdrinier machines does have some disadvantages. The present headbox technology does not 15 meet the requirements in terms of formation and calibration of the board thickness. Furthermore, web formation according to the Fourdrinier principle requires a vacuum as driving force for the greater part of the water to be removed. This means that the energy consumption of a typical plant is approximately 150 kW. Since the web dewaters to one 2o side, the machine required has to be very long.
In order to avoid the disadvantage of the chemical bonding agents used in dry processes, the aim is to improve the wet process used to date.
The invention is thus characterized by the fiber stock suspension being dewatered on two sides between wires or felts. The energy consumption 2s can be greatly reduced as a result because there is no vacuum required.
2388 AT-engl A further development of the invention is characterized by dilution water being added locally in order to regulate the board thickness across the web running direction. This is a simple means of evening out the board thickness without requiring a great deal of design work. The thickness is s then regulated on the basis of the final board thickness measured.
A favorable configuration of the invention is characterized by headbox lips being set locally to regulate the board thickness across the web running direction. The board thickness can be set approximately using these headbox lips, with a more precise board thickness being obtained in ~o combination with the dilution water.
A favorable further development of the invention is characterized by pre-dewatering taking place in a wedge zone. Due to the rising pressure in the wedge zone, even dewatering to a high consistency can be achieved quickly over a short length and without applying a vacuum, where the 15 board thickness can be influenced accordingly by using an adjustable wedge zone.
An advantageous further development of the invention is characterized by the stock being distributed over the working width by means of a cross-flow distributor and by part of the fiber stock suspension flow being 2o returned to the headbox. The optimum basis weight cross-profile can be set as a result of this suspension being returned to the headbox.
An advantageous configuration of the invention is characterized by the process dewatering to a dry content of more than 40%, preferably more than 45%. As a result, there is a drop in subsequent pressing time in the 2s hot press (providing a higher throughput), in the amount of heavily loaded filtrate produced during hot pressing, and in the amount of steam needed to evaporate the residual water.
2388 AT-engl A favorable configuration of the invention is characterized by a top layer being applied after pre-dewatering, with vacuum extraction possibly also being provided in the area where the top layer is applied. Thus, it is possible to obtain good fiberboard surface properties by using small s amounts of high-grade fibers without having to alter the composition or quality of the rest of the board.
A favorable further development of the invention is characterized by further dewatering in a wedge zone after the top layer has been applied.
As a result, the entire web, including the top layer, can be dewatered well.
o An advantageous further development of the invention is characterized by several points being provided with line pressure, for example two to six, preferably three to five. A particularly high final dry content can be achieved as a result.
The invention also refers to a forming device for fiberboard.
15 This device is characterized by a top wire being provided in the main dewatering zone. With the top wire added, the web can dewater on two sides, virtually halving the dewatering paths, which can also substantially shorten the length of the machine.
An advantageous further development of the invention is characterized by 2o the top wire forming a wedge zone together with the bottom wire. As a result, high and controlled pressing force can be applied to the pulp web, which means that no vacuum is required later for dewatering purposes.
A favorable configuration of the invention is characterized by the wedge zone being of adjustable design. With this adjustable wedge zone, the 2s board thickness can be set particularly well.
2388 AT-engl An advantageous configuration of the invention is characterized by the bottom wire running essentially horizontally as this limits any disadvantageous effects of gravity.
A favorable further development of the invention is characterized by the wire or felt in the wedge zone being supported by perforated plastic or 'steel plates, foil strips or table rolls. Only by using a top wire according to the invention is it possible to exploit the advantages of the variants mentioned.
A favorable configuration of the invention is characterized by a second headbox being provided in order to apply a top layer.
An advantageous configuration of the invention is characterized by the wedge zones being suitable for pressure loading at the end, which means that the maximum dry content can be obtained after pre-dewatering, regardless of the board thickness to be produced and thus, the web ~5 undergoes optimum preparation for the subsequent press zone.
A favorable further development of the invention is characterized by several press nips being provided, particularly two to six, preferably between three and five, with the press rolls being arranged almost vertically above one another. This achieves a particularly high final dry 2o content.
A favorable further development of the invention is characterized by the press rolls in the press nips being suitable for individual pressure loading.
As a result, the final dry content and the dewatering curve can be controlled effectively.
25 A favorable configuration of the invention is characterized by the machine frame being suitable for cantilevering. This allows the use of endless woven wires, which provide a longer service life at high pressing forces.
2388 AT-engl The invention will now be described in examples and referring to the drawings, where Figure 1 shows a side view of a state-of the-art plant, Fig. 2 shows a horizontal projection of Fig. 1, Fig. 3 shows a side view of a plant s according to the invention, Fig. 4 shows a section through the line marked IV-IV in Fig. 3, Fig. 5 a section through the line marked V-V in Fig. 3, and Fig. 6 provides a sectional view of a headbox.
Figure 1 shows a side view of a Fourdrinier plant 1, with a gravity dewatering zone 2, where the web is guided over rolls 3. Adjoining this is a zone with vacuum rolls 4, where the greater part of the water is extracted from the web. After this zone, more water is pressed out of the web by rolls 5 and 6 mounted in pairs. A typical Fourdrinier plant according to the state of the art is approximately 14 m long for a throughput of 180 tonnes/day.
15 Figure 2 shows the horizontal projection, illustrating the large number of rolls 3 required, as well as the vacuum rolls 4 and the press rolls 5 and 6.
This figure also shows the drive motor 7 with the gearbox 8.
Figure 3 illustrates a fiberboard plant according to the invention. It comprises a headbox 22 and an initial dewatering zone 9, where the main 2o dewatering process takes place. This dewatering zone 9 has a bottom wire 10, which runs through the entire plant. It also has a top wire 11 so that the web can dewater in both directions. If no secondary pulp is to be added, there is only one top wire, which also runs through the entire plant.
As a result, the web is dewatered evenly over its entire thickness, which is 2s particularly important in fiber board production. The first dewatering zone is adjoined by a further dewatering zone 12, where more water is extracted from the web by vacuum boxes 13. Since only a comparatively very thin layer is fed in here, the amount of water extracted is very small 2388 AT-engl compared with state-of the-art plants. At the end of this zone 12, a top wire 14 is applied again for further dewatering. This wire 14 also runs through the subsequent press zone 15 with the rolls 16 mounted in pairs.
Here, a final dry content of more than 40% is achieved, preferably more s than 45%, due to the mechanical dewatering process. The headbox 22 used here can be a cross-flow distributor with a diffuser block and a perforated roll to break up the flocks forming in the suspension. The bottom wire 10 runs through the entire plant in an essentially horizontal position. A wedge 17 is formed in the first dewatering zone 9 together with the top wire 11. The wires 10, 11 run over perforated plates 18 here made of plastic or steel. As an alternative, foil strips or table rolls can be used. The gap height can be set at the end 19 of the wedge zone 17 or the wedge zone 17 can be pressure-loaded. A roll 20, driving against the top wire 11, forms the end of the wedge zone. At the dewatering zone 12, a further headbox 23 can be provided for a top layer. In order to dewater the top layer, a further top wire 14 is provided. Dewatering is assisted by extraction using vacuum (through boxes 13). The top wire 14 and the bottom wire 10 form a further wedge zone 21, which is also adjustable and can be designed for pressure-loading at the end of the zone if necessary.
2o In order to increase the final dry content, the press zone 15 contains two to six, preferably three to five, press nips, i.e. pairs of rolls pressed against one another. The present example shows four such roll pairs 16 which form press nips. A plant of this type has an overall length of approximately 11.5 m for a throughput of approximately 320 tonneslday, 2s i.e. although production is increased by approximately 80%, only some 80% of the length required in a state-of-the part plant is needed here.
This provides a specific output of approximately 220% compared with state-of the-art plants.
2388 AT-engl Figure 4 shows a section through the line marked IV-IV in Fig. 3. In this section viewed against the web running direction, the bottom wedge plate 18, a vacuum box 13 and the roll 20 at the end of the wedge zone 17 are all clearly shown. The so-called front side is marked FS and s the rear side, where all of the drives and other leads and lines are located, is marked TS.
Figure 5 shows a section through the same point as Fig. 4, however viewed in the web running direction. Here, the rear and front sides are reversed compared with Fig. 4. In addition to the vacuum box 13 and the wedge plate 18, this illustration also shows the second headbox 23 for the top layer. The suspension to the headbox 23 is fed through a connection pipe 24 coming from the rear side. The water extracted is removed from the vacuum box 13 through a pipe 25.
Figure 6 shows the headbox 22 in detail. The suspension is fed in 15 through a cross-flow distributor 26 and flows through a diffuser block 27 to a perforated roll 28, which breaks down any flocks that have formed in the suspension. From here, it is brought into the wedge zone 17 formed by the top 10 and bottom 11 wires.
The invention is not limited to the examples described. It would also be 2o possible to combine the individual dewatering zones in different ways, depending on the given requirements.
2388 AT-engl
Claims (21)
1. Process for the formation of fiber board, characterized by the fiber stock suspension being dewatered on two sides between wires or felts.
2. Process according to Claim 1, characterized by dilution water being added locally in order to regulate the board thickness across the web running direction.
3. Process according to Claim 1 or 2, characterized by headbox lips being set locally to regulate the board thickness across the web running direction.
4. Process according to one of Claims 1 to 3, characterized by pre-dewatering taking place in a wedge zone.
5. Process according to one of Claims 1 to 4, characterized by the stock being distributed over the working width by means of a cross-flow distributor and by part of the fiber stock suspension flow being returned to the headbox.
6. Process according to one of Claims 1 to 5, characterized by the process dewatering to a dry content of more than 40%, preferably more than 45%.
7. Process according to one of Claims 1 to 6, characterized by a top layer being applied after pre-dewatering.
8. Process according to Claim 7, characterized by vacuum extraction being provided in the area where the top layer is applied.
9. Process according to Claim 7 or 8, characterized by further dewatering in a wedge zone after the top layer has been applied.
10. Process according to one of Claims 1 to 9, characterized by several points being provided with line pressure, for example two to six, preferably three to five.
11. Device for implementing the process according to one of Claims 1 to 10, characterized by a top wire being provided in the main dewatering zone.
12. Device according to Claim 11, characterized by the top wire forming a wedge zone together with the bottom wire.
13. Device according to Claim 12, characterized by the wedge zone being of adjustable design.
14. Device according to one of Claims 11 to 13, characterized by the bottom wire running essentially horizontally.
15. Device according to one of Claims 12 to 14, characterized by the wire or felt in the wedge zone being supported by perforated plastic or steel plates, foil strips or table rolls.
16. Device according to one of Claims 11 to 15, characterized by a second headbox being provided in order to apply a top layer.
17. Device according to one of Claims 12 to 16, characterized by the wedge zones being suitable for pressure loading at the end.
18. Device according to one of Claims 11 to 17, characterized by several press nips being provided, particularly two to six, preferably between three and five.
19. Device according to Claim 18, characterized by the press rolls being arranged almost vertically above one another.
20. Device according to Claim 18 or 19, characterized by the press rolls in the press nips being suitable for individual pressure loading.
21. Device according to one of Claims 11 to 20, characterized by the machine frame being suitable for cantilevering.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA215/98 | 1998-02-06 | ||
| AT0021598A AT405951B (en) | 1998-02-06 | 1998-02-06 | METHOD AND DEVICE FOR FORMING FIBER PANELS |
| PCT/EP1999/000381 WO1999040254A1 (en) | 1998-02-06 | 1999-01-21 | Method and device for the production of fibre panels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2285440A1 true CA2285440A1 (en) | 1999-08-12 |
Family
ID=3484580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002285440A Abandoned CA2285440A1 (en) | 1998-02-06 | 1999-01-21 | Method and device for the production of fibre panels |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT405951B (en) |
| AU (1) | AU2829199A (en) |
| CA (1) | CA2285440A1 (en) |
| DE (1) | DE19980188B9 (en) |
| FI (1) | FI112517B (en) |
| SE (1) | SE516702C2 (en) |
| WO (1) | WO1999040254A1 (en) |
| ZA (1) | ZA99916B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE733057C (en) * | 1939-02-18 | 1943-03-18 | Ing Matthias Weiss | Dewatering or pressing machine for continuously moving, wet material webs |
| DE866462C (en) * | 1948-10-02 | 1953-02-09 | Rudolph Koepp & Co Chem Fab A | Process and device for the continuous pressing, drying and shaping of various types of material |
| JPS54125709A (en) * | 1978-01-31 | 1979-09-29 | Fuji Mfg Co Ltd | Apparatus for producing fiberboard |
| FI63077C (en) * | 1977-09-21 | 1983-04-11 | Tampella Oy Ab | PROCEDURE FOR THE ADJUSTMENT OF PROFILES IN FIBER BANKS AND IN PAPER MACHINES |
| AT377803B (en) * | 1982-09-22 | 1985-05-10 | Escher Wyss Gmbh | PAPER MACHINE |
| DE3932098C1 (en) * | 1989-09-26 | 1990-09-06 | G. Siempelkamp Gmbh & Co, 4150 Krefeld, De | |
| FI905896A (en) * | 1990-11-29 | 1992-05-30 | Valmet Paper Machinery Inc | FORMNINGSGAPSARRANGEMANG I EN DUBBELVIRAFORMARE AV EN PAPPERSMASKIN. |
| DE19523395A1 (en) * | 1995-06-28 | 1997-01-02 | Schaeffler Waelzlager Kg | Screw gear with a rolling ring nut |
| FI98843C (en) * | 1995-10-03 | 1997-08-25 | Valmet Corp | A method and apparatus for removing water from a paper or board web by compression |
| JP3670373B2 (en) * | 1995-12-27 | 2005-07-13 | 株式会社たいへい | Light fiberboard manufacturing equipment |
| AT405538B (en) * | 1997-11-28 | 1999-09-27 | Andritz Patentverwaltung | DEVICE FOR DRAINING A FIBROUS MATERIAL |
-
1998
- 1998-02-06 AT AT0021598A patent/AT405951B/en not_active IP Right Cessation
-
1999
- 1999-01-21 AU AU28291/99A patent/AU2829199A/en not_active Abandoned
- 1999-01-21 CA CA002285440A patent/CA2285440A1/en not_active Abandoned
- 1999-01-21 DE DE19980188T patent/DE19980188B9/en not_active Expired - Fee Related
- 1999-01-21 WO PCT/EP1999/000381 patent/WO1999040254A1/en active IP Right Grant
- 1999-02-05 ZA ZA9900916A patent/ZA99916B/en unknown
- 1999-09-07 FI FI991903A patent/FI112517B/en not_active IP Right Cessation
- 1999-10-04 SE SE9903570A patent/SE516702C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999040254A1 (en) | 1999-08-12 |
| SE516702C2 (en) | 2002-02-12 |
| DE19980188B4 (en) | 2006-05-24 |
| SE9903570L (en) | 1999-10-04 |
| FI112517B (en) | 2003-12-15 |
| AU2829199A (en) | 1999-08-23 |
| FI19991903A (en) | 1999-09-07 |
| AT405951B (en) | 2000-01-25 |
| DE19980188B9 (en) | 2006-09-14 |
| ZA99916B (en) | 1999-08-05 |
| SE9903570D0 (en) | 1999-10-04 |
| DE19980188D2 (en) | 2000-02-10 |
| ATA21598A (en) | 1999-05-15 |
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