CA2154317A1 - Elongated gap press - Google Patents
Elongated gap pressInfo
- Publication number
- CA2154317A1 CA2154317A1 CA 2154317 CA2154317A CA2154317A1 CA 2154317 A1 CA2154317 A1 CA 2154317A1 CA 2154317 CA2154317 CA 2154317 CA 2154317 A CA2154317 A CA 2154317A CA 2154317 A1 CA2154317 A1 CA 2154317A1
- Authority
- CA
- Canada
- Prior art keywords
- pressure pad
- press
- gap
- band
- pressing elements
- 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
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
Abstract
The invention pertains to an elongated gap press comprising two pressing elements (1,2) of which at least one of the pressing elements (1) is formed of a flexible, fluid impervious band (3) movable in a web moving direction (16), with the band being pressable, against the other one of the pressing elements (2), via at least one support element (4) arranged along a press zone, wherein at least one force transmitter (5) of the support element (4) is supported on a fixed carrier (6) and reacts upon a pressure pad (7), with the pressure pad carrying the band (3), with such a press being utilized particularly in the treatment of fiber webs.
In order to enhance the possibilities for correction, at least one additional correcting force transmitter (8,9), engages at a press gap entry region (10) and/or a press gap exit region (10) of the pressure pad (7), which changes the pressing force in this region of the pressure pad (7) via a pressure or moment input.
In order to enhance the possibilities for correction, at least one additional correcting force transmitter (8,9), engages at a press gap entry region (10) and/or a press gap exit region (10) of the pressure pad (7), which changes the pressing force in this region of the pressure pad (7) via a pressure or moment input.
Description
P13832.TRl ELONGATED GAP PRESS
The invention pertains to an elongated gap or extended nip press comprising two pressing elements of which at least one of the pressing elements is formed of a flexible, fluid impervious band movable in a web moving direction, with the band being pressable, against the other one of the pressing elements, via at least one support element arranged along a press zone, wherein at least one force transmitter of the support element is supported on a fixed carrier and reacts upon a pressure pad, with the pressure pad carrying the band.
Such presses are utilized particularly in the treatment of fiber webs, for example, for the dehydration or smoothing purposes.
European Patent Publication EP 345 501 sets forth an elongated gap or extended nip press in which two tandem rows of cylinder-piston devices, in the web moving direction, effect or react upon a pressure pad and press same against the other pressing element. Moveable between the pressure pad and the other pressing element, in addition to the fluid-impervious flexible band of the pressing element, are a fiberweb and a porous dehydration band for receiving the pressed out water. Such elongated gap or extended nip presses are suitable for influencing the pressure pattern or distribution in the press gap or nip, particularly in the web moving direction to thereby increase the dehydration result.
There are disadvantages in that, in addition to the relative limitation of the correctional possibilities of the pressure pattern in the press gap or nip, there is also the fact that corrections result only via both of the main force transmitters, which due to safety reasons must often be 21S~317 P13832.TR1 technically control-coupled with the force transmitters of other pressing elements.
It is thus the task or object of this invention to produce an elongated gap press which, via simple construction, provides improved possibilities for the correction of the pressure pattern or distribution in the press gap or nip.
This task or object is solved or achieved in accordance with this invention via the apparatuses set forth in claims 1 and 2, with the depending claims setting forth specific embodiments thereof.
In this manner, at the press gap entry and/or exit portions of the pressure pad, at least one additional correcting force transmitter, next to the force transmitter of the support element, engages the pressure pad, wherein the additional force transmitter is supported at the pressure pad or at the carrier, and which acts approximately in or against the pressing direction of the pressing pad, considerably increases the number of correctional possibilities of the pressure pattern in the press gap or nip. In addition, herewith, if at all, only the force transmitter which is actuated with the greatest portion of the applied pressure must be technically control-coupled with a possibly present force transmitter of the other pressing element, so that it is impossible that only one force transmitter is effective. The force transmitters of the support elements are each generally centrally arranged with reference to the support elements, wherein however, larger deviations from a mid portion, for example in the ratio of 1 to 2 are quite feasible.
P13832.TR1 In order to keep the total pressure in the press gap constant, it is advantageous when, for the changing of the pressure pattern in the press gap, the outgoing force of one of the correction force transmitters, supported on the carrier, is reduced and the force of the opposing correction force transmitter, in the web path, is increased by the same amount.
It is also possible, to influence the pressure pattern in the press gap via the initiation of moments into the pressure pad. This also increases the number of correctional possibilities and decreases the possibly required expenditure for the coupling with the other pressing elements in the manner already previously described.
For the implementation of this idea it is possible, on one side that, at the press gap entry and/or exit portions of the pressure pad, at least one additional correcting force transmitter each is engaged, which is supported on the pressure pad itself and acts approximately transversely to the pressing direction of the pressure pad, or on the other side, that, at the press gap entry and/or exit region of the pressure pad, at least one additional correcting force transmitter each is engaged, which is supported on the carrier and also acts in a direction transversely to the pressing direction of the pressure pad, wherein the pressure pad is fixed or located via at least one bearing.
In order to implement the effects, emanating from the correcting force transmitters, with the least possible force and at a well defined region, it is further of advantage that the pressure pad is so shaped or constructed that the flexibility of the press gap entry and/or exit regions, P13832.TR1 relative to the middle or center of the pressure pad, in the direction of the other pressing element, is increased.
With reference to the two above-noted basic variations, there are several possibilities for increasing the flexibility or mobility of the press gap entry and/or exit regions. For example, it is feasible to decrease the cross section of the pressure pad between the mid point thereof and the press gap entry and/or the middle and the press gap exit, at at least one location. Either by itself, or with other means it is also possible that the pressure pad be comprised of at least two parts, that are so constructed and arranged that the pressure pad, at least between the center thereof and the press gap entry and/or the middle of the press gap and the press gap exit, is more flexible in at least one location than in the middle region thereof. For this, materials are generally suitable which have a modulus of elasticity less than that of steel. Of course, in all of the noted variations, the actual location of the engagement points of the force transmitters, relative to the support elements, influences the location of the flexible regions of the support elements.
Complementing the above,-there is yet the additional variation that the pressure gap is comprised of a fiber reinforced material, whereby the fiber orientation is so chosen that the pressure pad is more flexible in the web moving direction than in a direction transverse to the web moving direction, which is preferably the case with fibers extending in a direction transverse to the web moving direction.
21~317 P13832.TR1 Hereinafter, the invention will be described in more detail with reference to four embodiments thereof.
In the accompanying drawings there is shown:
Fig. 1 is a schematic partially sectioned representation of a pressing element as per claim 1;
Fig. 2 is a schematic partially sectioned representation of a pressing element as per claim 2;
Fig. 3 is a schematic partially sectioned representation of a pressing element as per claim l; and Fig. 4 is a schematic partially sectioned representation of a pressing element as per claim 2.
Common to all of the several embodiments is that the elongated gap or extended nip press is comprised of two pressing elements 1 and 2, wherein one of the pressing elements 1 is formed of a flexible, fluid-impervious band 3, movable in a web moving direction 16, with the band 3 being pressable, against the other pressing element 2, via at least one support element 4. Each support element 4 includes at least one force transmitter 5 which produces the main pressure, with force transmitter 5 being supported on a fixed carrier 6, and acting approximately centrally upon the band 3 that is carried by a pressure pad 7 of support element 4. In addition, a further correcting force transmitter 8 or 9 acts upon press gap entry and exit regions 10, respectively.
The opposing pressing element 2 can also be formed as a deflection controlled pressing element 2, similar to pressing element 1 or, for example, also as a conventional hollow or solid roll. Pressing element 1 can, depending on its usage, also include several axial, with reference to carrier 6, juxtaposed, independently controllable support elements 4.
The force transmitters 5 are here, same as correcting force 215~17 P13832.TR1 transmitters 8,9, hydraulically or pneumatically operative cylinder-piston units, whereby however also other types of units can be utilized. The lubrication of pressure pad 7 can be accomplished selectively hydrostatically and/or hydrodynamically.
Fig. 1 shows an embodiment, as defined in claim 1, wherein the correcting force transmitters 8 and 9, which engage the press gap entry and exit regions 10 of the pressure pad 7, are supported at carrier 6 and act in the direction of the other pressing element 2. As a result thereof, the press gap entry and exit portions 10, relative to the middle or center 11 of pressure pad 7, have increased flexibility in the direction of the other pressing element 2, so that correcting force transmitters 8 and 9 not only increase the number of correctional possibilities but also use less energy to achieve the desired effect.
The influencing of the flexibility is accomplished, in this example, in that the cross section of pressure pad 7, between the middle or center 11 thereof and the press gap entry 10 as well as the press gap exit 10, is smaller in a transition area thereof.
With reference to the controlling of correcting force transmitters 8 and 9, it can be of advantage when, for the changing of the pressure pattern in the press gap, at least one of the correction force transmitters 8 or 9, reduces the outgoing force and that the force of opposing correction force transmitters 8 and 9, in the web path, is increased by the same amount. This produces the result that, also during the correction of the pressure pattern in the press gap, the totally applied pressure of the pressure pad is not changed.
P13832.TR1 In Fig. 2 the correction of the press gap entry and exit portion 10 of pressure pad 7 occurs in accordance with claim 2 via the production of moments, in which at each of press gap entrance and exit portions 10 of pressure pad 7, an additional correcting force transmitter 8 or 9, supported on carrier 6, acts or engages laterally with respect to the pressing direction of pressure pad 7. In order to point out not only the possibility for the production of additional pressure but also for the originating, at the press gap, of relieving tensile forces in the respective region, correcting force transmitter 9, arranged at the press exit, acts against web moving direction 16, whereby pressure pad 7, in this region, is pushed away, via the moment produced thereby, from the other pressing element 2.
In all of the embodiments there is also the possibility, in principle, instead of the pressure or compressive forces, to also produce tensile forces, for correction purposes via suitably developed correcting force transmitters.
In order to increase the effectiveness of correction force transmitters 8 and 9, pressure pad 7 has, in the region between the press gap entry and exit 10 and middle 11, a lesser cross section, which increases the flexibility or mobility relative to middle 11. In addition, a two piece construction of pressure pad 7 has been perfected. The two parts or portions 12 and 13 of pressure pad 7 have differing material properties, particularly with reference to their flexibility and are so constructed or shaped that the pressure pad 7 between the press gap entry and exit portions is flexible. For a more certain guidance of pressure pad 7, carrier 6, at the height of press gap entry 10 of pressure pad 7 is provided with a limit stop 18, for pressure pad 7, since 215~317 P13832.TR1 due to the generation of moments, laterally with respect to pressing direction 17, pressure pad 7 is exposed to substantial forces.
Fig. 3 shows, similar to that of Fig. 1, and in accordance with claim 1, a solution in which at each of press gap inlet and exit portions 10, a correcting force transmitter 8 and 9 engages at pressure pad 7 and acts in the pressing direction 17 of pressure pad 7. This leads to a spreading or inclination or, due to the use of the noted tension devices, to a pulling together of pressure pad 7 and over the press area of pressure pad 7 for influencing the pressure pattern or distribution in the press gap.
The last embodiment, shown in Fig. 4 pertains to claim 2.
Here again, are additional correcting force transmitter 8 and 9 engage at the press gap entry and exit regions of pressure pad 7, which however, in contrast to Fig. 2, are supported at pressure pad 7 itself and act transversely to pressing direction 17 of pressure pad 7.
Via this spreading of pressure pad 7 in pressing gap entry and exit regions 10 there again is a moment generation which leads to a deformation of pressure pad 7 in these regions.
Again, in the last two constructions, the severally previously already described cross sectional reduction of pressure pad 7 was utilized in order to increase the mobility or flexibility thereof.
It is additionally possible, as a measure for influencing only the mobility itself, that is without a cross sectional P13832.TR1 reduction or in combination with one of the previously noted embodiments, to construct pressure pad 7 of a fiber reinforced material, whereby the fiber orientation is so chosen, that the pressure pad, in web moving direction 16, is more flexible than in a direction transverse to the web moving direction, which is particularly present when the fibers are predominantly arranged in a direction transverse to web moving direction 16.
In summary it can be said that the correctional possibilities are alone already increased via the increased number of correcting force transmitters 8 and 9 of pressure pads 7. In addition, the taking effect of the forces or moments emanating from correcting force transmitters 8 and 9 is increased via the increased mobility of pressure pad 7 and the ends with reference to the middle thereof.
Via the generation of additional compression or tensile force at the inlet and outlet of fiber web or band 14, which in the illustrated examples extends, together with a dehydration web or band, through the press gap, can, among the other things, be influenced by the steepness of the pressure rise and pressure fall, which is advantageous in heated presses for controlling the delamination of fiber web or band 14.
It is however possible, without difficulty, to also utilize this press for the smoothing of fiber webs or bands 14. In this manner, smoothing webs can be transferred, together with fiber web or band 14, through the press gap.
The invention pertains to an elongated gap or extended nip press comprising two pressing elements of which at least one of the pressing elements is formed of a flexible, fluid impervious band movable in a web moving direction, with the band being pressable, against the other one of the pressing elements, via at least one support element arranged along a press zone, wherein at least one force transmitter of the support element is supported on a fixed carrier and reacts upon a pressure pad, with the pressure pad carrying the band.
Such presses are utilized particularly in the treatment of fiber webs, for example, for the dehydration or smoothing purposes.
European Patent Publication EP 345 501 sets forth an elongated gap or extended nip press in which two tandem rows of cylinder-piston devices, in the web moving direction, effect or react upon a pressure pad and press same against the other pressing element. Moveable between the pressure pad and the other pressing element, in addition to the fluid-impervious flexible band of the pressing element, are a fiberweb and a porous dehydration band for receiving the pressed out water. Such elongated gap or extended nip presses are suitable for influencing the pressure pattern or distribution in the press gap or nip, particularly in the web moving direction to thereby increase the dehydration result.
There are disadvantages in that, in addition to the relative limitation of the correctional possibilities of the pressure pattern in the press gap or nip, there is also the fact that corrections result only via both of the main force transmitters, which due to safety reasons must often be 21S~317 P13832.TR1 technically control-coupled with the force transmitters of other pressing elements.
It is thus the task or object of this invention to produce an elongated gap press which, via simple construction, provides improved possibilities for the correction of the pressure pattern or distribution in the press gap or nip.
This task or object is solved or achieved in accordance with this invention via the apparatuses set forth in claims 1 and 2, with the depending claims setting forth specific embodiments thereof.
In this manner, at the press gap entry and/or exit portions of the pressure pad, at least one additional correcting force transmitter, next to the force transmitter of the support element, engages the pressure pad, wherein the additional force transmitter is supported at the pressure pad or at the carrier, and which acts approximately in or against the pressing direction of the pressing pad, considerably increases the number of correctional possibilities of the pressure pattern in the press gap or nip. In addition, herewith, if at all, only the force transmitter which is actuated with the greatest portion of the applied pressure must be technically control-coupled with a possibly present force transmitter of the other pressing element, so that it is impossible that only one force transmitter is effective. The force transmitters of the support elements are each generally centrally arranged with reference to the support elements, wherein however, larger deviations from a mid portion, for example in the ratio of 1 to 2 are quite feasible.
P13832.TR1 In order to keep the total pressure in the press gap constant, it is advantageous when, for the changing of the pressure pattern in the press gap, the outgoing force of one of the correction force transmitters, supported on the carrier, is reduced and the force of the opposing correction force transmitter, in the web path, is increased by the same amount.
It is also possible, to influence the pressure pattern in the press gap via the initiation of moments into the pressure pad. This also increases the number of correctional possibilities and decreases the possibly required expenditure for the coupling with the other pressing elements in the manner already previously described.
For the implementation of this idea it is possible, on one side that, at the press gap entry and/or exit portions of the pressure pad, at least one additional correcting force transmitter each is engaged, which is supported on the pressure pad itself and acts approximately transversely to the pressing direction of the pressure pad, or on the other side, that, at the press gap entry and/or exit region of the pressure pad, at least one additional correcting force transmitter each is engaged, which is supported on the carrier and also acts in a direction transversely to the pressing direction of the pressure pad, wherein the pressure pad is fixed or located via at least one bearing.
In order to implement the effects, emanating from the correcting force transmitters, with the least possible force and at a well defined region, it is further of advantage that the pressure pad is so shaped or constructed that the flexibility of the press gap entry and/or exit regions, P13832.TR1 relative to the middle or center of the pressure pad, in the direction of the other pressing element, is increased.
With reference to the two above-noted basic variations, there are several possibilities for increasing the flexibility or mobility of the press gap entry and/or exit regions. For example, it is feasible to decrease the cross section of the pressure pad between the mid point thereof and the press gap entry and/or the middle and the press gap exit, at at least one location. Either by itself, or with other means it is also possible that the pressure pad be comprised of at least two parts, that are so constructed and arranged that the pressure pad, at least between the center thereof and the press gap entry and/or the middle of the press gap and the press gap exit, is more flexible in at least one location than in the middle region thereof. For this, materials are generally suitable which have a modulus of elasticity less than that of steel. Of course, in all of the noted variations, the actual location of the engagement points of the force transmitters, relative to the support elements, influences the location of the flexible regions of the support elements.
Complementing the above,-there is yet the additional variation that the pressure gap is comprised of a fiber reinforced material, whereby the fiber orientation is so chosen that the pressure pad is more flexible in the web moving direction than in a direction transverse to the web moving direction, which is preferably the case with fibers extending in a direction transverse to the web moving direction.
21~317 P13832.TR1 Hereinafter, the invention will be described in more detail with reference to four embodiments thereof.
In the accompanying drawings there is shown:
Fig. 1 is a schematic partially sectioned representation of a pressing element as per claim 1;
Fig. 2 is a schematic partially sectioned representation of a pressing element as per claim 2;
Fig. 3 is a schematic partially sectioned representation of a pressing element as per claim l; and Fig. 4 is a schematic partially sectioned representation of a pressing element as per claim 2.
Common to all of the several embodiments is that the elongated gap or extended nip press is comprised of two pressing elements 1 and 2, wherein one of the pressing elements 1 is formed of a flexible, fluid-impervious band 3, movable in a web moving direction 16, with the band 3 being pressable, against the other pressing element 2, via at least one support element 4. Each support element 4 includes at least one force transmitter 5 which produces the main pressure, with force transmitter 5 being supported on a fixed carrier 6, and acting approximately centrally upon the band 3 that is carried by a pressure pad 7 of support element 4. In addition, a further correcting force transmitter 8 or 9 acts upon press gap entry and exit regions 10, respectively.
The opposing pressing element 2 can also be formed as a deflection controlled pressing element 2, similar to pressing element 1 or, for example, also as a conventional hollow or solid roll. Pressing element 1 can, depending on its usage, also include several axial, with reference to carrier 6, juxtaposed, independently controllable support elements 4.
The force transmitters 5 are here, same as correcting force 215~17 P13832.TR1 transmitters 8,9, hydraulically or pneumatically operative cylinder-piston units, whereby however also other types of units can be utilized. The lubrication of pressure pad 7 can be accomplished selectively hydrostatically and/or hydrodynamically.
Fig. 1 shows an embodiment, as defined in claim 1, wherein the correcting force transmitters 8 and 9, which engage the press gap entry and exit regions 10 of the pressure pad 7, are supported at carrier 6 and act in the direction of the other pressing element 2. As a result thereof, the press gap entry and exit portions 10, relative to the middle or center 11 of pressure pad 7, have increased flexibility in the direction of the other pressing element 2, so that correcting force transmitters 8 and 9 not only increase the number of correctional possibilities but also use less energy to achieve the desired effect.
The influencing of the flexibility is accomplished, in this example, in that the cross section of pressure pad 7, between the middle or center 11 thereof and the press gap entry 10 as well as the press gap exit 10, is smaller in a transition area thereof.
With reference to the controlling of correcting force transmitters 8 and 9, it can be of advantage when, for the changing of the pressure pattern in the press gap, at least one of the correction force transmitters 8 or 9, reduces the outgoing force and that the force of opposing correction force transmitters 8 and 9, in the web path, is increased by the same amount. This produces the result that, also during the correction of the pressure pattern in the press gap, the totally applied pressure of the pressure pad is not changed.
P13832.TR1 In Fig. 2 the correction of the press gap entry and exit portion 10 of pressure pad 7 occurs in accordance with claim 2 via the production of moments, in which at each of press gap entrance and exit portions 10 of pressure pad 7, an additional correcting force transmitter 8 or 9, supported on carrier 6, acts or engages laterally with respect to the pressing direction of pressure pad 7. In order to point out not only the possibility for the production of additional pressure but also for the originating, at the press gap, of relieving tensile forces in the respective region, correcting force transmitter 9, arranged at the press exit, acts against web moving direction 16, whereby pressure pad 7, in this region, is pushed away, via the moment produced thereby, from the other pressing element 2.
In all of the embodiments there is also the possibility, in principle, instead of the pressure or compressive forces, to also produce tensile forces, for correction purposes via suitably developed correcting force transmitters.
In order to increase the effectiveness of correction force transmitters 8 and 9, pressure pad 7 has, in the region between the press gap entry and exit 10 and middle 11, a lesser cross section, which increases the flexibility or mobility relative to middle 11. In addition, a two piece construction of pressure pad 7 has been perfected. The two parts or portions 12 and 13 of pressure pad 7 have differing material properties, particularly with reference to their flexibility and are so constructed or shaped that the pressure pad 7 between the press gap entry and exit portions is flexible. For a more certain guidance of pressure pad 7, carrier 6, at the height of press gap entry 10 of pressure pad 7 is provided with a limit stop 18, for pressure pad 7, since 215~317 P13832.TR1 due to the generation of moments, laterally with respect to pressing direction 17, pressure pad 7 is exposed to substantial forces.
Fig. 3 shows, similar to that of Fig. 1, and in accordance with claim 1, a solution in which at each of press gap inlet and exit portions 10, a correcting force transmitter 8 and 9 engages at pressure pad 7 and acts in the pressing direction 17 of pressure pad 7. This leads to a spreading or inclination or, due to the use of the noted tension devices, to a pulling together of pressure pad 7 and over the press area of pressure pad 7 for influencing the pressure pattern or distribution in the press gap.
The last embodiment, shown in Fig. 4 pertains to claim 2.
Here again, are additional correcting force transmitter 8 and 9 engage at the press gap entry and exit regions of pressure pad 7, which however, in contrast to Fig. 2, are supported at pressure pad 7 itself and act transversely to pressing direction 17 of pressure pad 7.
Via this spreading of pressure pad 7 in pressing gap entry and exit regions 10 there again is a moment generation which leads to a deformation of pressure pad 7 in these regions.
Again, in the last two constructions, the severally previously already described cross sectional reduction of pressure pad 7 was utilized in order to increase the mobility or flexibility thereof.
It is additionally possible, as a measure for influencing only the mobility itself, that is without a cross sectional P13832.TR1 reduction or in combination with one of the previously noted embodiments, to construct pressure pad 7 of a fiber reinforced material, whereby the fiber orientation is so chosen, that the pressure pad, in web moving direction 16, is more flexible than in a direction transverse to the web moving direction, which is particularly present when the fibers are predominantly arranged in a direction transverse to web moving direction 16.
In summary it can be said that the correctional possibilities are alone already increased via the increased number of correcting force transmitters 8 and 9 of pressure pads 7. In addition, the taking effect of the forces or moments emanating from correcting force transmitters 8 and 9 is increased via the increased mobility of pressure pad 7 and the ends with reference to the middle thereof.
Via the generation of additional compression or tensile force at the inlet and outlet of fiber web or band 14, which in the illustrated examples extends, together with a dehydration web or band, through the press gap, can, among the other things, be influenced by the steepness of the pressure rise and pressure fall, which is advantageous in heated presses for controlling the delamination of fiber web or band 14.
It is however possible, without difficulty, to also utilize this press for the smoothing of fiber webs or bands 14. In this manner, smoothing webs can be transferred, together with fiber web or band 14, through the press gap.
Claims (7)
1. An elongated gap press comprising two pressing elements (1,2) of which at least one of the pressing elements (1) is formed of a flexible, fluid impervious band (3) movable in a web moving direction (16), with the band being pressable, against the other one of the pressing elements (2), via at least one support element (4) arranged along a press zone, wherein at least one force transmitter (5) of the support element (4) is supported on a fixed carrier (6) and reacts upon a pressure pad (7), with the pressure pad carrying the band (3), therein characterized, that at least one additional correcting force transmitter (8,9), engages at a press gap entry region (10) and/or a press gap exit region (10) of the pressure pad (7), with the at least one correcting force transmitter being supported on the pressure pad (7) itself or on the carrier (6) and acts approximately against or in a pressing direction (17) of the pressure pad (7).
2. An elongated gap press comprising two pressing elements (1, 2) of which at least one of the pressing elements (1) is formed of a flexible, fluid impervious band (3) movable in a web moving direction (16), with the band being pressable, against the other one of the pressing elements (2), via at least one support element (4) arranged along a press zone, wherein at least one force transmitter (5) of the support element (4) is supported on a fixed carrier (6) and reacts upon a pressure pad (7), with the pressure pad carrying the band (3), therein characterized, that at least one additional correcting force transmitter (8,9), engages at a press gap entry region (10) and/or a press gap exit region (10) of the pressure pad (7), with the at least one correcting force transmitter being supported on the pressure pad (7) itself or on the carrier (6) and acts approximately transversely to a pressing direction (17) of the pressure pad (7).
3. The elongated gap press of one of claims 1 to 2, therein characterized, that the pressure pad (7) is so constructed that the flexibility of the press gap entry region (10) and/or of the press gap exit region (10) of the press pad (7) relative to the center (11) of the pressure pad (7) is enhanced in approximately the direction of the other one of the pressing elements (2).
4. The elongated gap press of one of claims 1 to 3, therein characterized, that the cross section of the pressure pad (7) is reduced in at least one location between the center (11) of the pressure pad (7) and the press gap entry portion (10) and the center (11) of the pressure pad (7) and the press gap exit portion (10).
5. The elongated gap press of one of claims 1 to 4, therein characterized, that the pressure pad (7) is comprised of at least two portions (12,13), wherein the two portions are so constructed and procured that the pressure pad (7), at least between the center (11) of the pressure pad (7) and the press gap entry portion (10) and/or the center (11) of the pressure pad (7) and the press gap exit portion (10), is more flexible in at least one location than in the remaining region of the pressure pad (7).
6. The elongated gap press of one of claims 1 to 5, therein characterized, that the pressure pad (7) is comprised of a fiber reinforced material, wherein the fiber orientation is so chosen that the pressure pad (7), is more flexible in the web moving direction (16) than in a direction transverse to the web moving direction (16).
7. The elongated gap press of one of claims 1 to 6, therein characterized, that the fibers predominately extend in a direction transverse to the web moving direction (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19944425915 DE4425915A1 (en) | 1994-07-21 | 1994-07-21 | Long nip press for e.g. dewatering fibrous web materials |
| DEP4425915.8 | 1994-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2154317A1 true CA2154317A1 (en) | 1996-01-22 |
Family
ID=6523834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2154317 Abandoned CA2154317A1 (en) | 1994-07-21 | 1995-07-20 | Elongated gap press |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH0881893A (en) |
| CA (1) | CA2154317A1 (en) |
| DE (1) | DE4425915A1 (en) |
| FI (1) | FI953527A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999045195A1 (en) * | 1998-03-04 | 1999-09-10 | Valmet Corporation | Extended-nip press roll and a press section of a paper machine applying it |
| US6036820A (en) * | 1997-04-10 | 2000-03-14 | Voith Sulzer Papiermaschinen Gmbh | Shoe press unit |
| WO2001049930A1 (en) * | 1999-12-30 | 2001-07-12 | Valmet-Karlstad Ab | Device for forming a nip |
| US7172680B2 (en) | 2001-04-02 | 2007-02-06 | Metso Paper, Inc. | Shoe roll |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19631638A1 (en) * | 1996-08-05 | 1998-02-12 | Voith Sulzer Papiermasch Gmbh | Press arrangement |
| DE19631637A1 (en) * | 1996-08-05 | 1998-02-12 | Voith Sulzer Papiermasch Gmbh | Press arrangement |
| WO1998058122A1 (en) * | 1997-06-17 | 1998-12-23 | Beloit Technologies, Inc. | Extended nip press with improved press shoe and pressure applying apparatus |
| US5897747A (en) * | 1997-08-08 | 1999-04-27 | Beloit Technologies, Inc. | Machine direction profiling of extended nip press shoe |
| US5980693A (en) * | 1998-03-26 | 1999-11-09 | Beloit Technologies, Inc. | Extended nip press apparatus |
| DE10229155A1 (en) * | 2002-06-28 | 2004-01-15 | Voith Paper Patent Gmbh | Adjustment to the longitudinal/lateral pressure profile for a moving web, through a press gap, changes the contour of the press shoe body through an inner chamber which is pressurized and/or heated/cooled |
| DE10336230A1 (en) * | 2003-08-07 | 2005-03-03 | Voith Paper Patent Gmbh | Device for treating a material web |
| JP4779564B2 (en) * | 2005-10-18 | 2011-09-28 | 王子製紙株式会社 | Shoe press apparatus for paper machine and paper manufacturing method |
| DE102010039708A1 (en) * | 2010-08-24 | 2012-03-01 | Voith Patent Gmbh | Shoe press roll for an extended-nip press |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE461171C (en) * | 1988-05-25 | 1992-05-15 | Valmet Paper Machinery Inc | LONG NYP PRESSES BEFORE PAPER OR CARTON MACHINERY |
| US5167768A (en) * | 1991-11-07 | 1992-12-01 | Beloit Corporation | Wide nip web press and method using a press shoe with two pivots |
-
1994
- 1994-07-21 DE DE19944425915 patent/DE4425915A1/en not_active Withdrawn
-
1995
- 1995-07-18 JP JP18189695A patent/JPH0881893A/en active Pending
- 1995-07-20 CA CA 2154317 patent/CA2154317A1/en not_active Abandoned
- 1995-07-21 FI FI953527A patent/FI953527A/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6036820A (en) * | 1997-04-10 | 2000-03-14 | Voith Sulzer Papiermaschinen Gmbh | Shoe press unit |
| WO1999045195A1 (en) * | 1998-03-04 | 1999-09-10 | Valmet Corporation | Extended-nip press roll and a press section of a paper machine applying it |
| WO2001049930A1 (en) * | 1999-12-30 | 2001-07-12 | Valmet-Karlstad Ab | Device for forming a nip |
| US7172680B2 (en) | 2001-04-02 | 2007-02-06 | Metso Paper, Inc. | Shoe roll |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4425915A1 (en) | 1996-02-01 |
| JPH0881893A (en) | 1996-03-26 |
| FI953527A0 (en) | 1995-07-21 |
| FI953527A (en) | 1996-01-22 |
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