CA2040999A1 - Vertical former - Google Patents
Vertical formerInfo
- Publication number
- CA2040999A1 CA2040999A1 CA002040999A CA2040999A CA2040999A1 CA 2040999 A1 CA2040999 A1 CA 2040999A1 CA 002040999 A CA002040999 A CA 002040999A CA 2040999 A CA2040999 A CA 2040999A CA 2040999 A1 CA2040999 A1 CA 2040999A1
- Authority
- CA
- Canada
- Prior art keywords
- formation
- wire
- former according
- vertical former
- twin
- 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
Abstract
ABSTRACT
The invention relates to a vertical former comprising a vertically extending twin-wire. Various forming members are arranged lying alternatively opposite one another in the formation route in order to achieve an improved formation in connection with an improved web strength and in particular a more even web structure.
The invention relates to a vertical former comprising a vertically extending twin-wire. Various forming members are arranged lying alternatively opposite one another in the formation route in order to achieve an improved formation in connection with an improved web strength and in particular a more even web structure.
Description
3$~9 Vertical Former The invention relates to a vertical former of a paper machine, in particular for making wood-free printing paper and liner board or test liner, comprising a twin-wire, the two wires of which are moved together with the suspension through an essentially vertical formation section, the formation section consisting of at least two formation zones in which a forming member is respectively arranged which in the moving direction of the twin-wire are arranged on alternative sides of the same consecutively in the moving direction and act upon the one or the other wire.
Such a vertical former is known from US-A-9,790,909. In this, after a forming roll curved suction boxes are arranged lying consecutively on alternative sides in the ¦ moving direction, the one suction box lying against the one ! side of the twin-wire and the other suction box displaced in the moving direction on the other side in order to achieve a symmetrical de-watering and thus a symmetrical sheet structure. ~owever, the de-watering occurs offset timewise so that both lateral regions without a forming member effect a different formation structure.
Additionally, the wires are not guided over longer stretches which leads to a wave formation of the wires over the web width and to streaked paper.
The patent FI843,081 discloses a vertical former in which a suction former is arranged directly over a vacuum shoe with a certain radius and opposite pressing rails. A further suction box is arranged behind the first mentioned box in the moving direction. Thus, an unequilateral distribution of the de-watering quantities ensues and an asymmetrical ~ ~ `A ~ ~ 3 9 web structure results. On account of the radius of the vacuum shoe and the engagement of the rigid rails in direct succession a very strong initial de-watering results which leads to crushing in the web.
It is an object of the invention to provide a vertical former of the type initially mentioned in which an improved formation can be achieved in connection with an improved web strength and in particular an even web structure without streak formation .
This object is solved in accordance with the invention in that with regard to the one for~ing members, other forming members are arranged on the respective opposite side of the twin-wire equally on alternative sides and consecutively in the moving direction which guide and support the wires.
Usefully, an open former roll is connected at the inlet side of the formation route. However, an open former roll can also be connected at the outlet side of the formation route. These former rolls are preferably suction rolls.
.
It is also possible to provide a vacuumed, slotted suction device ahead of the first forming member.
On account of the inventive solution, an improved formation can be achieved in connection with an improved web structure and in connection with a smoother web structure and smoothness at the surface. The formation according to the invention is also particularly well suited for web weights > 80 g/m2. Additionally, the device according to the invention can be used in connection with a multi-- layered head box with well-directed collection of the screened water. Finally, an improved retention of the fibers during the de-watering process is possible.
- 3 - 2~ 9 Usefully, the one and the other forming members are arranged on different sides of the twin-wire respectively opposing one another.
With regard to a further improvement, the one forming members can be suction boxes with a formation shoe (mesh) and the other forming elements pressing rails.
Usefully, the suction boxes can have one, two or more suction zones. ~n an advantageous embodiment (Fig. 5) the water dams up in the suction box sections and the vacuum acts above the water surface. In this case, the vacuum can be of different magnitude in the different suction zones.
If one views the course of vacuum within a section of the suction box along a stretch perpendicular to the de-watering rails, the vacuum is then the greatest at the top on account of the dammed up water and reduces from the top to the bottom as seen against the moving direction of the twin-wire. This effect is very advantageous, as the de-watering effect can thus be dosed in such a manner that initially, where the suspension is still de-watered less, the applied vacuum is smaller. On account of this, the formation is advantageously influenced. A continuous development of the vacuum can also be achieved for the finite division of the suction box.
Usefully, the rearward formation zones in the moving direction of the twin-wire can be longer than the forward formation zones. This leads to a particularly gentle formation, in particular then if the formation shoe of the most forward suction box in the moving direction of the twin-wire is usefully not curved, i.e. essentially straight. Thus, the web is treated gently in the first phase of the formation and the de-watering.
Such a vertical former is known from US-A-9,790,909. In this, after a forming roll curved suction boxes are arranged lying consecutively on alternative sides in the ¦ moving direction, the one suction box lying against the one ! side of the twin-wire and the other suction box displaced in the moving direction on the other side in order to achieve a symmetrical de-watering and thus a symmetrical sheet structure. ~owever, the de-watering occurs offset timewise so that both lateral regions without a forming member effect a different formation structure.
Additionally, the wires are not guided over longer stretches which leads to a wave formation of the wires over the web width and to streaked paper.
The patent FI843,081 discloses a vertical former in which a suction former is arranged directly over a vacuum shoe with a certain radius and opposite pressing rails. A further suction box is arranged behind the first mentioned box in the moving direction. Thus, an unequilateral distribution of the de-watering quantities ensues and an asymmetrical ~ ~ `A ~ ~ 3 9 web structure results. On account of the radius of the vacuum shoe and the engagement of the rigid rails in direct succession a very strong initial de-watering results which leads to crushing in the web.
It is an object of the invention to provide a vertical former of the type initially mentioned in which an improved formation can be achieved in connection with an improved web strength and in particular an even web structure without streak formation .
This object is solved in accordance with the invention in that with regard to the one for~ing members, other forming members are arranged on the respective opposite side of the twin-wire equally on alternative sides and consecutively in the moving direction which guide and support the wires.
Usefully, an open former roll is connected at the inlet side of the formation route. However, an open former roll can also be connected at the outlet side of the formation route. These former rolls are preferably suction rolls.
.
It is also possible to provide a vacuumed, slotted suction device ahead of the first forming member.
On account of the inventive solution, an improved formation can be achieved in connection with an improved web structure and in connection with a smoother web structure and smoothness at the surface. The formation according to the invention is also particularly well suited for web weights > 80 g/m2. Additionally, the device according to the invention can be used in connection with a multi-- layered head box with well-directed collection of the screened water. Finally, an improved retention of the fibers during the de-watering process is possible.
- 3 - 2~ 9 Usefully, the one and the other forming members are arranged on different sides of the twin-wire respectively opposing one another.
With regard to a further improvement, the one forming members can be suction boxes with a formation shoe (mesh) and the other forming elements pressing rails.
Usefully, the suction boxes can have one, two or more suction zones. ~n an advantageous embodiment (Fig. 5) the water dams up in the suction box sections and the vacuum acts above the water surface. In this case, the vacuum can be of different magnitude in the different suction zones.
If one views the course of vacuum within a section of the suction box along a stretch perpendicular to the de-watering rails, the vacuum is then the greatest at the top on account of the dammed up water and reduces from the top to the bottom as seen against the moving direction of the twin-wire. This effect is very advantageous, as the de-watering effect can thus be dosed in such a manner that initially, where the suspension is still de-watered less, the applied vacuum is smaller. On account of this, the formation is advantageously influenced. A continuous development of the vacuum can also be achieved for the finite division of the suction box.
Usefully, the rearward formation zones in the moving direction of the twin-wire can be longer than the forward formation zones. This leads to a particularly gentle formation, in particular then if the formation shoe of the most forward suction box in the moving direction of the twin-wire is usefully not curved, i.e. essentially straight. Thus, the web is treated gently in the first phase of the formation and the de-watering.
2 3 ~
A further optimization possibility results if the forming rails can be pressed elastically against the twin-wire.
On account of the arrangement on alternative sides of different forming members in several stages, it is possible to avoid asymmetrical blank sides, which has a positive influence on an even and gently acting formation.
Further advantageous embodiments can be taken from the dependent claims.
The invention is described in the following in more detail with respect to purely schematically depicted embodiments in the drawings, in which:
Fig. 1 shows a schematic complete side view of a vertical former with an essentially straight formation route, Fig. 2 shows the formation section alone, Fig. ~ equally shows the formation section alone, but with a curved formation route, Fig. 4 equally shows the formation section alone with an oppositely curved formation route in comparison to Fig. 3, the formation route being straight in the first formation zone thereof, Fig. 5 schematically shows a two-staged suction box, Fig. 6 schematically shows a three-staged suction box with a different water removal, and - 5 - ~0~ 9 Fig~ 7 schematically shows a vacuumed, slotted suction device.
The vertical former as schematically depicted in Fig. 1 comprises two wires Sl and S2 which converge as a twin-wire in the region of a nozzle 10 feeding the suspension. This twin-wire passes through a formation route or a formation section 12. At the outlet side of this formation route, the twin-wire DS is guided about a forming roll 14.
Following this forming roll 14, the wire Sl is led about a deflection roll 16 or at the inlet about a closed breast roll 14'. This forming roll 1~ is an open forming roll.
After the forming roll 14, the wire S2 is respectively led about deflection rolls 16' and 16", the wires Sl and S2 converging as the twin-wire DS between the pressed roll 14' and the deflection roll 16". The nozzle 10 is directed in-to the converging gap in order to lead the watery suspension into the roll gap where a first de-watering occurs.
The formation route 12 or the formation section 12 is divided into two zones, namely a first forming zone Zl and a second forming zone Z2, the travel of the twin-wire DS
ensuing essentially vertically with a maximum inclination of 30 to the vertical. Preferably, the first formation zone Zl is shorter than the second formation zone Z2.
Naturally, several successive zones can also be provided~
It is important that in each zone a respective forming member is arranged opposite another on the opposite ends of the twin-wire DS, namely pressing rails 18 in the first formation zone Zl on the right hand side which can preferabIy be pressed elastically and possibly elastically adjustable against the twin-wire or the wire S2 in the region of the twin-wire DS in order to lead off the water - 6 - ~G~ 9 removed via a removing box 18~. On the opposing side, a suction box 19 with a formation shoe 19' is located lying against the wire Sl, the formation shoe consisting of a mesh-like structure comprising rails continuous across the width and slots, as is known in principle.
In the second formation zone Z2 on the same side, like the suction box 19, pressing rails 20 are located comprising a water removal box 20'. On the opposing side, a suction box 21 comprising a formation shoe 21' lies against the wire S2. This means that a forming member is arranged in each formation stage Zl and Z2 on both sides of the twin-wire DS, the opposing forming members being different forming members in the form of pressing rails on the one hand and suction boxes on the other hand which, however, are arranged on alternative sides in the moving direction of the twin-wire DS. In Fig. 1, the formation shoes 19', 21' are straight. The formation route 12 also proceeds in a straight manner between the forming rolls 14' and 14.
In Fig. 2, the forming route or the formation section 12 is drawn in detail. A difference comprises in that the nozzle 10 guides the suspension from bottom left to top right at an angle into the gap between the rolls 19 and 16", which results in the initial de-watering process being influenced in an amended form. The suction box 19 is sinsle-staged here comprising a deflection member 19" and the suction box 21 is two-staged comprising a deflection member 21"~ A
clearer depiction of this two-staged suction box 21 comprising the water collector 22 can be seen more clearly in Fig. 5 of the appended drawings.
In Figs. 3 and 4, one twin-wire progression in the formation section 12 is shown respectively curved to the left or to the right, although the formation shoe 19' in - 7 ~ 9 the first formation stage Zl is preferably straight in order to be able to conduct a more gentle de-watering in the first stage. However, it is also possible to embody the formation shoe 21~ in the second zone Z2 to be equally straight, both formation stages Zl and Z2 thus being arranged slightly inclined at an angle to one another. In both cases the nozzle 10 is directed in such a manner that it directs the suspension from bottom right to top left in-to the gap where the wires Sl and S2 converge into the twin-wire DS. In this case the wire S2 is led about the open forming roll 14`.
In Fig. 6 a three-staged suction box 26 is shown, namely with a formation shoe 26' which is straight in this case.
The twin-wire progression is shown by means of an arrow 27. It can be seen from the water levels in the de-watering water discharge 28 that a higher vacuum exists in the uppermost section 29 than in the section 30 lying therebeneath and the section 31 lying even further below this. This means that the suction pressure in the suction box sections increases from the bottom to the top in accordance with the direction of movement 27, this also having a positive influence on the gentle de-watering with regard to an improved formation under the consideration of the desired web strength and in particular an even web structure.
It should be noted that in accordance with the depiction in Fig. 2, 3 and 4, troughs 13 are provided for collecting the water withdrawn by the forming breast roller 14~
Fig. 7 shows an embodiment of a vacuumed, slotted suction device arranged ahead of an arrangement of pressing rails 34 which are movable essentially vertical to the wire S in accordance with the arrow 36 in order to change the - 8 - ~f~
pressing force of the rails. The slotted suction device 32 consists of an inlet part 40 equally movable essentially vertically to the wire S in accordance with the arrow 38, the inlet part forming a gap 44 preferably converging to-wards the wire S in the direction of the arrow 42. In this region, a very advantageous pre-dewatering results through the slot 46 under the influence of a vacuum effective in the space 48. Preferably, the slot 46 extends essentially horizontally in a first section after the gap 44 and then essentially vertically and subsequently arrives in a collecting container 50. A collecting container 52 serves to take up via a collecting plate 60 the water withdrawn in the region of the pressing rails 34.
In Fig. 4, a suction box 62 for subdividing is provided after the open forming roll 14 under the wire S2.
A further optimization possibility results if the forming rails can be pressed elastically against the twin-wire.
On account of the arrangement on alternative sides of different forming members in several stages, it is possible to avoid asymmetrical blank sides, which has a positive influence on an even and gently acting formation.
Further advantageous embodiments can be taken from the dependent claims.
The invention is described in the following in more detail with respect to purely schematically depicted embodiments in the drawings, in which:
Fig. 1 shows a schematic complete side view of a vertical former with an essentially straight formation route, Fig. 2 shows the formation section alone, Fig. ~ equally shows the formation section alone, but with a curved formation route, Fig. 4 equally shows the formation section alone with an oppositely curved formation route in comparison to Fig. 3, the formation route being straight in the first formation zone thereof, Fig. 5 schematically shows a two-staged suction box, Fig. 6 schematically shows a three-staged suction box with a different water removal, and - 5 - ~0~ 9 Fig~ 7 schematically shows a vacuumed, slotted suction device.
The vertical former as schematically depicted in Fig. 1 comprises two wires Sl and S2 which converge as a twin-wire in the region of a nozzle 10 feeding the suspension. This twin-wire passes through a formation route or a formation section 12. At the outlet side of this formation route, the twin-wire DS is guided about a forming roll 14.
Following this forming roll 14, the wire Sl is led about a deflection roll 16 or at the inlet about a closed breast roll 14'. This forming roll 1~ is an open forming roll.
After the forming roll 14, the wire S2 is respectively led about deflection rolls 16' and 16", the wires Sl and S2 converging as the twin-wire DS between the pressed roll 14' and the deflection roll 16". The nozzle 10 is directed in-to the converging gap in order to lead the watery suspension into the roll gap where a first de-watering occurs.
The formation route 12 or the formation section 12 is divided into two zones, namely a first forming zone Zl and a second forming zone Z2, the travel of the twin-wire DS
ensuing essentially vertically with a maximum inclination of 30 to the vertical. Preferably, the first formation zone Zl is shorter than the second formation zone Z2.
Naturally, several successive zones can also be provided~
It is important that in each zone a respective forming member is arranged opposite another on the opposite ends of the twin-wire DS, namely pressing rails 18 in the first formation zone Zl on the right hand side which can preferabIy be pressed elastically and possibly elastically adjustable against the twin-wire or the wire S2 in the region of the twin-wire DS in order to lead off the water - 6 - ~G~ 9 removed via a removing box 18~. On the opposing side, a suction box 19 with a formation shoe 19' is located lying against the wire Sl, the formation shoe consisting of a mesh-like structure comprising rails continuous across the width and slots, as is known in principle.
In the second formation zone Z2 on the same side, like the suction box 19, pressing rails 20 are located comprising a water removal box 20'. On the opposing side, a suction box 21 comprising a formation shoe 21' lies against the wire S2. This means that a forming member is arranged in each formation stage Zl and Z2 on both sides of the twin-wire DS, the opposing forming members being different forming members in the form of pressing rails on the one hand and suction boxes on the other hand which, however, are arranged on alternative sides in the moving direction of the twin-wire DS. In Fig. 1, the formation shoes 19', 21' are straight. The formation route 12 also proceeds in a straight manner between the forming rolls 14' and 14.
In Fig. 2, the forming route or the formation section 12 is drawn in detail. A difference comprises in that the nozzle 10 guides the suspension from bottom left to top right at an angle into the gap between the rolls 19 and 16", which results in the initial de-watering process being influenced in an amended form. The suction box 19 is sinsle-staged here comprising a deflection member 19" and the suction box 21 is two-staged comprising a deflection member 21"~ A
clearer depiction of this two-staged suction box 21 comprising the water collector 22 can be seen more clearly in Fig. 5 of the appended drawings.
In Figs. 3 and 4, one twin-wire progression in the formation section 12 is shown respectively curved to the left or to the right, although the formation shoe 19' in - 7 ~ 9 the first formation stage Zl is preferably straight in order to be able to conduct a more gentle de-watering in the first stage. However, it is also possible to embody the formation shoe 21~ in the second zone Z2 to be equally straight, both formation stages Zl and Z2 thus being arranged slightly inclined at an angle to one another. In both cases the nozzle 10 is directed in such a manner that it directs the suspension from bottom right to top left in-to the gap where the wires Sl and S2 converge into the twin-wire DS. In this case the wire S2 is led about the open forming roll 14`.
In Fig. 6 a three-staged suction box 26 is shown, namely with a formation shoe 26' which is straight in this case.
The twin-wire progression is shown by means of an arrow 27. It can be seen from the water levels in the de-watering water discharge 28 that a higher vacuum exists in the uppermost section 29 than in the section 30 lying therebeneath and the section 31 lying even further below this. This means that the suction pressure in the suction box sections increases from the bottom to the top in accordance with the direction of movement 27, this also having a positive influence on the gentle de-watering with regard to an improved formation under the consideration of the desired web strength and in particular an even web structure.
It should be noted that in accordance with the depiction in Fig. 2, 3 and 4, troughs 13 are provided for collecting the water withdrawn by the forming breast roller 14~
Fig. 7 shows an embodiment of a vacuumed, slotted suction device arranged ahead of an arrangement of pressing rails 34 which are movable essentially vertical to the wire S in accordance with the arrow 36 in order to change the - 8 - ~f~
pressing force of the rails. The slotted suction device 32 consists of an inlet part 40 equally movable essentially vertically to the wire S in accordance with the arrow 38, the inlet part forming a gap 44 preferably converging to-wards the wire S in the direction of the arrow 42. In this region, a very advantageous pre-dewatering results through the slot 46 under the influence of a vacuum effective in the space 48. Preferably, the slot 46 extends essentially horizontally in a first section after the gap 44 and then essentially vertically and subsequently arrives in a collecting container 50. A collecting container 52 serves to take up via a collecting plate 60 the water withdrawn in the region of the pressing rails 34.
In Fig. 4, a suction box 62 for subdividing is provided after the open forming roll 14 under the wire S2.
Claims (14)
1. Vertical former of a paper machine, in particular for making wood-free printing paper and liner board or test liner, comprising a twin-wire, both wires of which are moved together with the suspension through an essentially vertical formation section, the formation section consisting of at least two formation zones in which a forming member is respectively arranged which in the moving direction of the twin-wire are arranged from the bottom to the top on alternative sides of the same consecutively in the moving direction and act upon the one or the other wire, characterized in that with regard to the one forming members, other forming members are arranged on the respectively opposing side of the twin-wire equally on alternative sides and consecutively in the moving direction.
2. Vertical former according to claim 1, characterized in that the one and the other forming members are arranged lying respectively opposite one another.
3. Vertical former according to claim 1 or 2, characterized in that the one forming members are suction boxes comprising a formation shoe and the other forming members are pressing rails.
4. Vertical former according to claim 3, characterized in that the formation shoe comprising grid meshes formed by forming rails lies against the twin-wire.
5. Vertical former according to claim 3, characterized in that the suction box has at least two suction zones.
6. Vertical former according to claim 5, characterized in that vacuums of different magnitude prevail in the suction zones and decrease from the top to the bottom.
7. Vertical former according to claim 1, characterized in that the rearward formation zone in the moving direction of the twin-wire is longer than the forward formation zone.
8. Vertical former according to claim 3, characterized in that the formation shoe of the forward suction box in the direction of movement of the twin-wire is essentially straight.
9. Vertical former according to claim 3, characterized in that the pressing rails can be pressed elastically.
10. Vertical former according to claim 1, 2 or 3, characterized in that an open forming breast roll is connected to the inlet side of the formation route.
11. Vertical former according to claim 1, 2 or 3, characterized in that an open forming roll is connected to the outlet side of the formation route.
12. Vertical former according to claim 10, characterized in that the open forming breast roll is a suction roll.
13. Vertical former according to claim 11, characterized in that the open forming roll is a suction roll.
14. Vertical former according to claim 1, 2 or 3, characterized in that a vacuumed, slotted suction device is mounted ahead of the first forming member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4014403A DE4014403C2 (en) | 1990-05-04 | 1990-05-04 | Vertical former |
| DEP4014403.8 | 1990-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2040999A1 true CA2040999A1 (en) | 1991-11-05 |
Family
ID=6405738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002040999A Abandoned CA2040999A1 (en) | 1990-05-04 | 1991-04-23 | Vertical former |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0454989B1 (en) |
| AT (1) | ATE119956T1 (en) |
| CA (1) | CA2040999A1 (en) |
| DE (2) | DE4014403C2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI93032C (en) * | 1991-03-15 | 1995-02-10 | Valmet Paper Machinery Inc | Two-wire web forming section of a paper machine |
| FI920228A0 (en) * | 1992-01-17 | 1992-01-17 | Valmet Paper Machinery Inc | BANFORMNINGSPARTI FOER PAPPERSMASKIN. |
| DE4301103C1 (en) * | 1993-01-18 | 1994-08-18 | Voith Gmbh J M | Screen section of a paper machine |
| FI96623C (en) * | 1994-08-31 | 1996-07-25 | Valmet Paper Machinery Inc | Double-wire molders, especially for fast paper machines |
| AT401185B (en) * | 1994-10-14 | 1996-07-25 | Andritz Patentverwaltung | DEVICE FOR DRAINAGE AND OR OR WASHING SUSPENSIONS, ESPECIALLY FIBROUS SUSPENSIONS |
| DE19651241A1 (en) * | 1996-12-10 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Double fourdrinier pulp water extraction |
| DE19652485A1 (en) * | 1996-12-17 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Paper-making machine fourdrinier section |
| FI109299B (en) * | 2001-01-22 | 2002-06-28 | Metso Paper Inc | Twin |
| DE20104380U1 (en) | 2001-03-13 | 2001-06-28 | Voith Paper Patent Gmbh | Twin wire former |
| DE10161056A1 (en) | 2001-12-12 | 2003-06-26 | Voith Paper Patent Gmbh | Wire section |
| DE102005000014A1 (en) * | 2005-02-24 | 2006-08-31 | Voith Paper Patent Gmbh | Twin-wire former for producing a fibrous web from at least one pulp suspension |
| DE102008040948A1 (en) | 2008-08-01 | 2010-02-04 | Voith Patent Gmbh | Twin-wire former for a machine for producing a fibrous web |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT327670B (en) * | 1970-10-30 | 1976-02-10 | Arledter Hanns F Dr Ing | DRAINAGE DEVICE FOR A TWIN SCREEN PAPER MACHINE |
| AT328283B (en) * | 1970-11-16 | 1976-03-10 | Arledter Hanns F Dr Ing | METHOD AND EQUIPMENT FOR MANUFACTURING FIBER WEBS WITH SPATIAL ORIENTED FIBERS |
| CA960496A (en) * | 1971-03-25 | 1975-01-07 | Beloit Corporation | Vertical twin wire web forming arrangement |
| DE8405243U1 (en) * | 1984-02-21 | 1986-07-31 | O. Dörries GmbH, 5160 Düren | Device for guiding the wires of a twin-wire section of a paper or board machine |
| US4790909A (en) * | 1986-12-17 | 1988-12-13 | Beloit Corporation | Two-wire paper forming apparatus |
| SE456590B (en) * | 1987-09-07 | 1988-10-17 | Ahlstroem Valmet | DEVICE FOR CONTROL OF VIRUSES IN A PAPER MACHINE OR CARTON MACHINE |
| DE3815470A1 (en) * | 1988-05-06 | 1989-11-16 | Voith Gmbh J M | DOUBLE SCREEN SHAPER |
-
1990
- 1990-05-04 DE DE4014403A patent/DE4014403C2/en not_active Expired - Fee Related
-
1991
- 1991-03-22 DE DE59104927T patent/DE59104927D1/en not_active Expired - Fee Related
- 1991-03-22 AT AT91104493T patent/ATE119956T1/en not_active IP Right Cessation
- 1991-03-22 EP EP91104493A patent/EP0454989B1/en not_active Expired - Lifetime
- 1991-04-23 CA CA002040999A patent/CA2040999A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0454989A1 (en) | 1991-11-06 |
| DE4014403C2 (en) | 1994-03-10 |
| DE59104927D1 (en) | 1995-04-20 |
| DE4014403A1 (en) | 1991-11-07 |
| EP0454989B1 (en) | 1995-03-15 |
| ATE119956T1 (en) | 1995-04-15 |
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| AU629901B2 (en) | A forming apparatus for forming a web from stock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |