CN101517161A - Wet forming paper machine with systems to reduce turbulence in the water-slurry circuits and related method - Google Patents
Wet forming paper machine with systems to reduce turbulence in the water-slurry circuits and related method Download PDFInfo
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- CN101517161A CN101517161A CNA2007800331680A CN200780033168A CN101517161A CN 101517161 A CN101517161 A CN 101517161A CN A2007800331680 A CNA2007800331680 A CN A2007800331680A CN 200780033168 A CN200780033168 A CN 200780033168A CN 101517161 A CN101517161 A CN 101517161A
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- Prior art keywords
- guide surface
- water
- buffer unit
- paper machine
- shaped region
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- 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
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Abstract
A machine comprises: at least a first continuous flexible member (3), and a second continuous flexible member (1) defining a forming area for forming a web of cellulose fibers; a headbox (17), to feed a slurry of water and cellulose fibers to said forming area; a collection vessel (22) for the water eliminated from the web forming area; an arrangement to slow said water eliminated from the web forming area. A curved guide surface (19) is also provided, disposed at the side of the web forming area, on the side from which the water is eliminated. The surface extends gradually away from the forming area and is oriented downward, so that the water forms a flow adhering to the guide surface. Moreover, a rotating damping member (23) is provided, arranged between said guide surface and said collection vessel, below the guide surface, to receive the water coming from said guide surface and discharge it into said collection vessel at a substantially reduced speed.
Description
Technical field
The present invention relates to improvement, and more specifically but be not exclusively, relate to the high-speed and continuous machine of producing tissue paper (tissue paper) continuous wet forming paper machine.
In particular, the present invention relates to the improvement of system so that reduce turbulent flow in the water-slurry circuits of these machines (turbulence, or be called turbulent flow).
Background technology
The up-to-date machine of producing paper with the continuous slice form has reached high productivity ratio, and the speed that surpasses 1000m/min is general now, and for the paper of some type, speed even can surpass the limit of 2000m/min.
The production that these speed are particularly at tissue paper---thin paper that promptly is mainly used in the thin paper of domestic use and is used for for example replacing being used to other purposes such as textiles of polishing and cleaning---realizes.
Be used for forming one of problem of having occurred in the recent systems of paper be in guidance system under high speed, and therefore have the generation of a large amount of current of quite big turbulent flow.
This circulation with fierceness fast in guidance system is mixed in the water air, and this performance for operating process is very harmful, because it causes the formation of foam, this foam must be removed in follow-up.Moreover the bubble that is mixed in the water is harmful to for the good formation of the paper that will produce.
The another kind of phenomenon that is caused by the circulation of the fierceness of water is the generation of water smoke and little water droplet, these water smokes and little water droplet keep being suspended in the paper shaped region ambient air, and must use the collecting hood that suitably is shaped and remove, this collecting hood is connected to powerful air exhauster(-tor and follow-up water in suspension separator by pipeline.
Being flowing under the identical or speed much at one of feed speed (the v=height is to 40m/sec) with filtration fabrics of water and fiber carried from hopper.
Be used for＜50g/m
2In the forming machine of thin paper, so-called " crescent pattern ", the directed textile properties felt and the contacted point of filtration fabrics that wherein will receive the wet paper that forms of the jet of fluid will form required paper on this filtration fabrics.This contact occurs on the bus of the major diameter roller that is called " shaping cylinder ", should " shaping cylinder " rotate with the peripheral speed of producing paper.
Obviously, the water that squeezes out between felt and fabric is carried with the speed identical with the feed speed of fabric on the shaping cylinder from the latter, and by means of extruding force and at first be centrifugal force, curved wall towards suitable shaping penetrates, to allow water to be recovered and to be sent to following collection container, it is sent to fluid return passageway with warehouse that arrives the storage tank effect and the pump that is fed into supply circuit once more from this.
The management in water recirculation stage has become vital thing for reaching high production speed.This causes utilizing a kind of water that reduces to drop to the collection container neutralization from its device to the speed of passing away conveying, thereby the unfavorable phenomenon that will be mingled with in the loop with mixing air reduces to minimum, prevents to float over the formation of the foam on the top of water and is distributed to the formation of the airborne water smoke in whole paper shaped region.
US-A4.028.174 has described a kind of system that reduces the turbulent flow the water of carrying from the paper shaped region in sequential machine.In this system, deflecting plates is positioned to collect from the water of shaping cylinder ejaculation and with its feeding by the hole that produces deflecting plates.The water that is passed in the hole in the deflecting plates drops in the following collection container then, and it is recovered and circulation again from this.Other system of speed that reduces the water removed from the sheet forming zone is in United States Patent (USP) no.4,267,017; No.4,501,040; No.4,790,909; No.4 describes in 714,522.
Summary of the invention
An object of the present invention is to provide a kind of machine and a kind of method, it allows more effectively to reduce particularly to be used for to form the turbulent flow in the water-slurry circuits in the continuous paper forming machine of tissue paper.
Another object of the present invention provides a kind of machine and a kind of method, and it allows to reduce at least in part by forming water smoke and/or entrained air caused the water of discharging from the sheet forming zone problem.
In essence, according to the present invention, provide a kind of continuous wet forming paper machine, comprising: at least the first continuous flexible parts and the second continuous flexible parts limit the shaped region of the paper web be used for forming cellulose fibre; Hopper is fed into described shaped region with the slurry of water and cellulose fibre; Container is collected the water of removing from the sheet forming zone; The device of the described water removed from the shaped region of paper web slows down; It is characterized in that described device comprises: laterally be arranged in the curved surface of a side of removing described water of the shaped region of paper web, extend away from shaped region and orientation downwards gradually on described surface, and water forms and is attached to flowing on the described guide surface; And be arranged in rotation buffer unit between described guide surface and the described collection container, below guide surface, be discharged to described collection container from the water of this guide surface and with it with the speed that reduces greatly to receive.
US-A-6,398,913 and US-A-2001/0018958 described and be used for the sequential machine that wet type forms paper web, the Banki turbine that wherein crosses stream (cross-flow) type is arranged in the sheet forming zone, its sole purpose is to retrieve the mobile energy of the water removed since the sheet forming zone.Do not mention and reduce the mobile turbulent problem of water described above and the concrete structure of defective thereof.
On the contrary, according to the present invention, the rotatable parts that the flowing of a kind of water that slows down are provided, will flow and itself be received in the blade and it is discharged with the null speed of reality, thereby reduce the energy in flowing widely and therefore reduce its turbulent flow, prevent or under any circumstance reduce the formation of water smoke and also reduce turbulent flow and therefore reduce the air capacity of in water, sneaking into.
, in appending claims, and followingly described according to machine of the present invention and further convenience feature method and embodiment indication with reference to unrestricted embodiment of the present invention.
Description of drawings
To understand the present invention better by following description and accompanying drawing, this accompanying drawing is represented unrestricted practical embodiments of the present invention.More particularly, in the accompanying drawings:
Fig. 1 is illustrated among first embodiment at the side view in conjunction with the sheet forming zone in the continuous wet forming paper machine of crescent pattern type of the present invention;
Fig. 2 represents in a second embodiment and the similar view of the view of Fig. 1; And
Fig. 3 represents to have the schematic cross-sectional of rotating buffer unit relative to blade.
The specific embodiment
Fig. 1 is illustrated in the crescent pattern structure, especially for tissue paper, the diagrammatic side view of the guidance system of paper machine continuously.Machine comprises the first continuous flexible parts 1, and these first continuous flexible parts 1 preferably are made of the felt around the closed path feeding, and this closed path only partly illustrates at this.What cooperate with felt 1 is the second continuous flexible parts 3 that preferably are made of fabric, and this fabric is complied with by guide roller 5,7,9,11 and the closed path that limited by the roller 15 that constitutes the shaping cylinder.Also coiled shape cylinder 15 feedings of felt 1.
In the roll gap in the sheet forming zone between roller 11 and 15, hopper 17 is for the slurry of the whole width of machine feeding water and cellulose fibre between felt 1 and fabric 3.This slurry pushes between parts 1,3, and percentage by weight surpasses the major part of 99% water that exists, and the centrifugal force of the shaped region in the comfortable and shaping cylinder 15 contacted radian measure alpha of origin between felt 1 and fabric 3 is removed.
Curved guide surface 19 is arranged in the front of shaping cylinder 15, is used for the water that leads and remove from fabric 3 by centrifugal force, as by arrow A signal indication.The water yield of removing by fabric 3 is quite big, the speed of production of considering these machines on the magnitude of 1000-2000m/min and from the dried component percentages of the slurry of hopper 17 feedings usually below 1%, for example on the magnitude of the 0.2-0.4% of weight.
Below guide surface 19, arrange the collection container 21 be used for discharge water, this collection container 21 extends for the whole width of machine, promptly extends axially portion for cylinder 15 whole and extends with whole width fabric 3 for felt 1.This container is connected on the side passing away 22, from these side passing away 22 recycle-waters, to be transported to the loop of feeding hopper 17 once more.
Extend downwards on surface 19, and below end be the edge 19A that is rotating above the blade of buffer unit 23.Rotate buffer unit 23 owing to being discharged to the kinetic energy of the water the blade that rotates buffer unit itself from surface 19 and rotating in the direction of arrow f23.Arrange to make the flowing of along the surface 19 water that produce (basically under laminar condition) with rotate buffer unit 23 tangent (tangent), and can as in the situation of the machine of the turbine of the sole purpose that is provided with the kinetic energy that is used for recycle-water specially, not cross (cross) it.The water that is discharged among the blade 23P that rotates buffer unit 23 from surface 19 is discharged to collection container 21 in the bottom of rotating buffer unit with zero velocity substantially.The turning cylinder 25 that rotates buffer unit 23 is supported by structure 27, arranges the collection container 21 that is used for collecting water in structure 27.
---promptly removing by fabric 3---water that layout described above make to be discharged mobile is " calmness ", reduced turbulent flow and it be transformed into along the base layer stream of guide surface 19 to flow, so that it is slowed down in rotating buffer unit 23 significantly.This has prevented or has under any circumstance reduced up hill and dale the formation of water smoke, and also reduces the amount of the air of sneaking into owing to the turbulent flow in the water of collecting in case 21 substantially.This also greatly is convenient to the recirculation of water, and reduced the needs that the water smoke that forms around the water discharging area is aspirated, this suction must in the special purification device, filter routinely with the water that will comprise the fiber residue and wherein its air of being suspended be separated.
By wall or side panel 31, by guide surface 19, and the assembly that forms by wall 33 of if necessary words can be by waving or sliding motion and with respect to the position-adjustable of shaping cylinder 15.This controllability allows guide surface 19 with respect to shaping cylinder 15 with respect to the optimization of the position of rotating buffer unit 23, this rotations buffer unit 23 be supported on respect to structure 27 fixing spools 25 on. Assembly 31,19,33 also can move to away from cylinder 15 is enough to be convenient to be used for changing when needed the degree of fabric 3 or felt 1.
For allow side panel 31 and surface 19 with respect to shaping cylinder 15 away from/towards the adjusting and the motion of wall 33, provide the special use adjusting and the telecontrol equipment that describe below.In Fig. 1, side panel 31, surface 19 and wall 33 pivot around pivotal pin 90, and can make and wave around this pivotal pin by means of ground jack 92, with away from 15 motions of shaping cylinder with allow insertion fabric and/or felt or dismounting.The position of pivotal pin 90 is to regulate, and for example, is used for screw and is fastened on the support member (not shown) on the dead load bearing structure 27 by described pivotal pin being installed in be provided with.By unclamping screw, thereby can regulate the position of pivotal pin 90 and regulate the position of the edge 19A on surface 19 with respect to the blade that rotates buffer unit 23.
In Fig. 2, be movable by means of ground jack 100 with respect to shaping cylinder 15 by side panel 31, surface 19 and the assembly that forms of wall 33, these ground jack 100 permission assemblies move toward and away from described cylinder.Operating position is limited by adjustable stops 102, the function of this adjustable stops 102 be equally regulate surface 19 discharge the position of edge 19A with it with respect to the blade that rotates buffer unit 23.
Fig. 3 represent in more detail to rotate buffer unit 23 with and the cross section of the profile of blade 23P.In the cross section, blade has the scoop-like structure with the profile similarity of the blade of Pelton turbine (Pelton wheel), and this allows flowing of water to be slowed to almost zero velocity efficiently.
In essence, the rotation buffer unit has the structure of the roller that is made of cylinder blanket, the periphery of this cylinder blanket is provided with passage, the shape and size of these passages be suitable for receiving from the current in sheet forming zone and change these current towards, thereby the rapid change of water jet is arrived almost null value, make this jet with by rotating buffer unit and the identical speed of sinking speed that difference in height between the collection channel itself causes, drop to collection container or the passage from the rotation buffer unit.
Rotate the device that buffer unit 23 can only be used as flowing of " calmness " water and reduce its turbulent flow.In this case, brake component advantageously is arranged on the axle that rotates buffer unit 23, to absorb the mobile energy that rotates buffer unit 23 that is delivered to from water.Brake component can be those same types with common use in the paper mill, and spool on the paper unwinding device of reel machine for example is used for slowing down.Selectively, this energy is for example by installing generator special or being used in any other suitable mode on the axle 25 of rotation buffer unit 23.
Fig. 2 represents the modification embodiment according to machine of the present invention.Those identical or corresponding parts that the same reference numerals indication has been described for reference Fig. 1.These parts do not refer again to Fig. 2 and describe.
Main difference between structure in Fig. 2 and the structure in Fig. 1 is to rotate the rotation direction of buffer unit 23.In the structure in Fig. 1, rotate buffer unit 23 and on opposite direction, rotate (arrow f23) with respect to the rotation direction (arrow f15) of shaping cylinder 15.Otherwise among the embodiment in Fig. 2, the layout of rotating buffer unit 23 makes that its rotation direction f23 is identical with the rotation direction f15 of shaping cylinder 15.For this purpose, rotating buffer unit 23 is positioned to make its turning cylinder 25 between the imaginary extension and shaping cylinder 15 of guide surface 19, and in Fig. 1, the turning cylinder 25 that rotates buffer unit 23 is oriented to, with respect to the imaginary extension of guide surface 19, on the opposition side of shaping cylinder 15.
In the structure in Fig. 2, the direct mechanical transmission of for example being represented by belt 41 might be arranged between the belt pulley on the axle A-A that is installed in the belt pulley 43 on the axle 25 that rotates buffer unit 23 and is installed in shaping cylinder 15.Responsible motor with motion fabric 3 felt 1 acts on the axle of shaping cylinder 15.The feed speed of compliant member 1,3 and therefore also have the paper forming speed can be by means of described motor control.By the CD-ROM drive motor control identical with shaping cylinder 15, the function that slows down that the water of giving it is flowed is optimized by the angular speed that allows to rotate buffer unit 23 at shaping cylinder 15 and the mechanical connection that rotates belt 41 representatives between the buffer unit 23.
In the structure of Fig. 2, rotate buffer unit 23 and be contained in fully substantially in the passage 35 that surface 19 and its imagination limit between lower extension and wall 33.Above rotation buffer unit 23, deflector surface 36 also is set, fall accidentally in those zones that can hinder the rotations of rotating buffer unit to prevent to point to the water that rotates buffer unit 23.
Should be understood that accompanying drawing only is provided by the example that provides by actual arrangement of the present invention, this example can not break away from the scope of the notion that the present invention is based on changing aspect form and the layout.Any Reference numeral that provides in appended claims is to describe for ease of reference and with reference to accompanying drawing reading right claim, does not limit the protection domain by claims representative.
Claims (18)
1. continuous wet forming paper machine comprises: at least the first continuous flexible parts and the second continuous flexible parts limit the shaped region of the paper web that is used for forming cellulose fibre; Hopper is fed into described shaped region with the slurry of water and cellulose fibre; Collection container is collected the water of removing from the shaped region of paper web; The device of the described water removed from the sheet forming zone slows down;
It is characterized in that, described device comprises:
-curved guide surface, this curved guide surface laterally are arranged in a side of removing described water in sheet forming zone, and described guide surface extends away from shaped region gradually and is orientated downwards, and described water forms and is attached to flowing on the described guide surface;
-and rotate buffer unit, and be arranged between described guide surface and the described collection container, below guide surface, be discharged in the described collection container with the speed that reduces greatly from the water of described guide surface and with it to receive.
2. paper machine according to claim 1, it is characterized in that, in described shaped region, described first and second compliant members are driven around the shaping cylinder, and described guide surface extends and extends away from the turning cylinder of shaping cylinder gradually around described shaping cylinder.
3. paper machine according to claim 2 is characterized in that, described rotation buffer unit is arranged to that its turning cylinder is paralleled substantially with the turning cylinder of forming rolls and below the turning cylinder of forming rolls.
4. according to claim 1,2 or 3 described paper machines, it is characterized in that described rotation buffer unit has the near cylindrical extension and receives the blade of current.
5. according to one or multinomial described paper machine of above claim, it is characterized in that described guide surface is to regulate with respect to the position of described shaped region.
6. according to one or multinomial described paper machine of above claim, it is characterized in that moving away from shaped region, and described guide surface is to regulate with respect to the position of described shaped region to described guide surface by the moving link support.
7. according to one or multinomial described paper machine of above claim, it is characterized in that, between described rotation buffer unit and described shaped region, be provided with protective bulkhead.
8. paper machine according to claim 7 is characterized in that, described protective bulkhead and described guide surface form the decline conduit, and at least a portion of described rotation buffer unit reaches in this decline conduit.
9. according to or multinomial described paper machine of above claim, it is characterized in that, described guide surface and described rotation buffer unit design and are arranged to, and the current that are directed on the described rotation buffer unit from described guide surface flow to be discharged to the described container around rotating buffer unit substantially tangently.
10. according to one or multinomial described paper machine of above claim, it is characterized in that described rotation buffer unit is mechanically connected at least one the guide roller of described continuous flexible parts.
11., it is characterized in that described rotation buffer unit is mechanically connected on the described forming rolls according to claim 2 and 10 described paper machines.
12., it is characterized in that described rotation buffer unit and described guide roller rotate according to claim 10 or 11 described paper machines on same direction, and,, be connected thereto preferably by means of flexible member by means of direct driving member.
13. one or multinomial described paper machine according to above claim is characterized in that described continuous flexible parts comprise felt and fabric.
14. a method that is used in wet forming paper machine, reducing to be discharged to the speed of the water the collection container from the sheet forming zone that between the first and second continuous flexible parts, limits,
It is characterized in that:
-curved surface being arranged on the side in sheet forming zone, described water is removed from this side, and described surface is extended away from shaped region gradually and is orientated downwards;
-forming current, these current are attached on the described guide surface and towards the rotation buffer unit that is arranged between described guide surface and the described collection container, below guide surface; And
-by means of described rotation buffer unit, slowing down is discharged in the described collection container with the speed that reduces greatly from the water of described guide surface and with it.
15. method according to claim 14 is characterized in that, is linked rotating the velocity of rotation of buffer unit and the movement velocity of described compliant member.
16. according to claim 14 or 15 described methods, it is characterized in that, arrange the shaping cylinder, and drive the described first and second continuous flexible parts, and the velocity of rotation of wherein rotating buffer unit is linked to the velocity of rotation of described shaping cylinder around described shaping cylinder.
17. one or multinomial described method according to claim 14 to 16 is characterized in that, current are collected in the blade that rotates buffer unit.
18. method according to claim 17 is characterized in that, with the speed that reduces greatly and zero the speed of preferably being approximately equal to water is discharged from described blade.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000216A ITFI20060216A1 (en) | 2006-09-06 | 2006-09-06 | MACHINE FOR THE FORMATION OF DAMP PAPER WITH TURBULENCE BREAKDOWN SYSTEMS IN WATER-DOUGH CIRCUITS AND ITS METHOD |
| ITFI2006A000216 | 2006-09-06 | ||
| PCT/IT2007/000600 WO2008029427A1 (en) | 2006-09-06 | 2007-08-31 | Wet forming paper machine with systems to reduce turbulence in the water-slurry circuits and related method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101517161A true CN101517161A (en) | 2009-08-26 |
| CN101517161B CN101517161B (en) | 2012-01-11 |
Family
ID=38744727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800331680A Expired - Fee Related CN101517161B (en) | 2006-09-06 | 2007-08-31 | Continuous wet forming paper machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2061929B1 (en) |
| CN (1) | CN101517161B (en) |
| AT (1) | ATE459749T1 (en) |
| DE (1) | DE602007005147D1 (en) |
| IT (1) | ITFI20060216A1 (en) |
| WO (1) | WO2008029427A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106574442A (en) * | 2014-07-01 | 2017-04-19 | 维美德股份公司 | Adjustable device for recovering energy from stock momentum |
| CN106661839A (en) * | 2014-07-09 | 2017-05-10 | 维美德股份公司 | Turbine control systems for energy recovery from stock momentum |
| CN107667197A (en) * | 2015-05-27 | 2018-02-06 | 维美德股份公司 | The apparatus and method for handling plain boiled water in paper machine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009000803A1 (en) * | 2009-02-12 | 2010-08-19 | Voith Patent Gmbh | twin |
| SE541440C2 (en) * | 2014-07-02 | 2019-10-01 | Valmet Oy | Guide plate shape for recovering energy from stock momentum |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE387143B (en) * | 1975-11-19 | 1976-08-30 | Karlstad Mekaniska Ab | DEVICE FOR LIQUID HANDLING BY ROLLER |
| US6398913B2 (en) * | 1999-12-16 | 2002-06-04 | Metso Paper Karlstad Aktiebolag | Arrangement and method for recovery of energy in a paper machine forming section |
| DE10255908A1 (en) * | 2002-11-29 | 2004-07-08 | Voith Paper Patent Gmbh | twin |
-
2006
- 2006-09-06 IT IT000216A patent/ITFI20060216A1/en unknown
-
2007
- 2007-08-31 WO PCT/IT2007/000600 patent/WO2008029427A1/en active Application Filing
- 2007-08-31 EP EP07827654A patent/EP2061929B1/en not_active Not-in-force
- 2007-08-31 CN CN2007800331680A patent/CN101517161B/en not_active Expired - Fee Related
- 2007-08-31 AT AT07827654T patent/ATE459749T1/en active
- 2007-08-31 DE DE602007005147T patent/DE602007005147D1/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106574442A (en) * | 2014-07-01 | 2017-04-19 | 维美德股份公司 | Adjustable device for recovering energy from stock momentum |
| CN106574442B (en) * | 2014-07-01 | 2019-02-15 | 维美德股份公司 | The adjustable apparatus to recover energy from paper pulp momentum |
| CN110042690A (en) * | 2014-07-01 | 2019-07-23 | 维美德股份公司 | The adjustable apparatus to recover energy from paper pulp momentum |
| CN106661839A (en) * | 2014-07-09 | 2017-05-10 | 维美德股份公司 | Turbine control systems for energy recovery from stock momentum |
| CN106661839B (en) * | 2014-07-09 | 2019-03-22 | 维美德股份公司 | The turbine control system to recover energy from paper pulp momentum |
| CN107667197A (en) * | 2015-05-27 | 2018-02-06 | 维美德股份公司 | The apparatus and method for handling plain boiled water in paper machine |
| US10550517B2 (en) | 2015-05-27 | 2020-02-04 | Valmet Aktiebolag | Apparatus and method for processing white water in a paper machine |
| US11028533B2 (en) | 2015-05-27 | 2021-06-08 | Valmet Aktiebolag | Apparatus and method for processing white water in a paper machine |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE459749T1 (en) | 2010-03-15 |
| WO2008029427A1 (en) | 2008-03-13 |
| EP2061929A1 (en) | 2009-05-27 |
| ITFI20060216A1 (en) | 2008-03-07 |
| EP2061929B1 (en) | 2010-03-03 |
| DE602007005147D1 (en) | 2010-04-15 |
| CN101517161B (en) | 2012-01-11 |
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Granted publication date: 20120111 Termination date: 20120831 |