CA2697054A1 - Method for compensating for faults in a paper web - Google Patents
Method for compensating for faults in a paper web Download PDFInfo
- Publication number
- CA2697054A1 CA2697054A1 CA2697054A CA2697054A CA2697054A1 CA 2697054 A1 CA2697054 A1 CA 2697054A1 CA 2697054 A CA2697054 A CA 2697054A CA 2697054 A CA2697054 A CA 2697054A CA 2697054 A1 CA2697054 A1 CA 2697054A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- paper
- centre
- adjusted
- release angle
- 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
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F2/00—Transferring continuous webs from wet ends to press sections
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
Landscapes
- Paper (AREA)
Abstract
Method for compensating for uneven shrinkage in a paper web in the press and drying sections of a paper machine, in which there is at least one open draw. In the method, a flow guide/guides are used in the head box, by means of which the machine direction orientation tendency of the fibres is reduced in the edge areas of the web and the angle of detaching of the web from the centre roll is adjusted, by directing onto the web an air jet that is located in the cross direction and the pressure of which can be adjusted in the said direction.
Description
Method for compensating for faults in a paper web The present invention relates to a method for compensating for faults, such non uniform shrinkage, in a paper web. In particular, the matter concerns compensating for greater shrinkage that occurs in the edge areas of the web than in both the centre, in the press and drying sections of a paper machine.
It is known that shrinkage in a paper web over its production width on a papermachine is uneven, in such a way that the shrinkage in the edge parts can be in the order of 7 %, whereas in the centre the shrinkage of the web can remain in the order of two or three percent. Refer to attached figure illustrating a typical shrinkage profile.
It is obvious that in the situation described above, it is extremely likely that unsaleable goods and other detrimental quality defects will be created, unless the shrinkage differences can be reduced in some manner.
Problems in the edge areas of the web include but are not limited to, an increase in the porosity of the edges, an increase in roughness at the edges, creasing or cockling, variation in the percentage of mineral filler content and of course poorer dimensional stability. The exact nature of the problem will depend on the type of the press and drying sections of the paper machine in question, and on the paper grade in general.
It is obvious that, in an analogous manner, other faults corresponding to shrinkage are also possible and that compensating for them belongs automatically to the scope of the present invention.
The present invention is intended to create an improvement in the adverse effects of shrinkage profile variation. The intention is to achieve the improvement in a manner that is very reasonably priced and simple.
It is known that shrinkage in a paper web over its production width on a papermachine is uneven, in such a way that the shrinkage in the edge parts can be in the order of 7 %, whereas in the centre the shrinkage of the web can remain in the order of two or three percent. Refer to attached figure illustrating a typical shrinkage profile.
It is obvious that in the situation described above, it is extremely likely that unsaleable goods and other detrimental quality defects will be created, unless the shrinkage differences can be reduced in some manner.
Problems in the edge areas of the web include but are not limited to, an increase in the porosity of the edges, an increase in roughness at the edges, creasing or cockling, variation in the percentage of mineral filler content and of course poorer dimensional stability. The exact nature of the problem will depend on the type of the press and drying sections of the paper machine in question, and on the paper grade in general.
It is obvious that, in an analogous manner, other faults corresponding to shrinkage are also possible and that compensating for them belongs automatically to the scope of the present invention.
The present invention is intended to create an improvement in the adverse effects of shrinkage profile variation. The intention is to achieve the improvement in a manner that is very reasonably priced and simple.
The aforementioned and other advantages and benefits of the present invention are achieved in the manner described in the accompanying claims.
Stated simply, the basic idea of the invention is that the fault, no matter whether it is natural or the result of some operation, is affected in such a way that the variation in properties can be minimized. Thus, for example, the shrinking of a paper web more at the edges than in the centre is a natural change, which when attempting to minimise also promotes an improvement of the quality of the paper reels at the edges.
In the following, the invention is described in greater detail also with reference to the accompanying drawings, in which Figure 1 shows one embodiment of a flow guide used according to the invention in the discharge nozzle of a head box of a paper machine in the direction of flow of the stock; and Figure 2 shows a second sub-area of the invention, in connection with the centre roll of the press section.
In the discharge nozzle of a head box of a paper machine, seen in the direction of flow of the stock, flow guides are used, which are intended to affect the properties of the paper, by affecting the turbulence of the jet. The length of the flow guides in the direction of travel of the stock has a significant effect on the properties of the paper. This is because the machine direction orientation of the fibres changes significantly as result of the turbulence generated by the flow guides. A
general rule is that the machine direction orientation of the fibres decreases as the length of the flow guides increases. In the present invention, this aforementioned property is exploited by making the flow guide or guides longer at the edges than in the centre. One example is shown in Figure 1, though only by way of example and not restrictively. In the figure is a flow guide 1, which is generally a plate-like piece. In this embodiment, the edges 2 of the guides are clearly extended.
Stated simply, the basic idea of the invention is that the fault, no matter whether it is natural or the result of some operation, is affected in such a way that the variation in properties can be minimized. Thus, for example, the shrinking of a paper web more at the edges than in the centre is a natural change, which when attempting to minimise also promotes an improvement of the quality of the paper reels at the edges.
In the following, the invention is described in greater detail also with reference to the accompanying drawings, in which Figure 1 shows one embodiment of a flow guide used according to the invention in the discharge nozzle of a head box of a paper machine in the direction of flow of the stock; and Figure 2 shows a second sub-area of the invention, in connection with the centre roll of the press section.
In the discharge nozzle of a head box of a paper machine, seen in the direction of flow of the stock, flow guides are used, which are intended to affect the properties of the paper, by affecting the turbulence of the jet. The length of the flow guides in the direction of travel of the stock has a significant effect on the properties of the paper. This is because the machine direction orientation of the fibres changes significantly as result of the turbulence generated by the flow guides. A
general rule is that the machine direction orientation of the fibres decreases as the length of the flow guides increases. In the present invention, this aforementioned property is exploited by making the flow guide or guides longer at the edges than in the centre. One example is shown in Figure 1, though only by way of example and not restrictively. In the figure is a flow guide 1, which is generally a plate-like piece. In this embodiment, the edges 2 of the guides are clearly extended.
Because the change in the machine direction magnitude of the fibre orientation in the edge areas of the web can also be a risk in terms of the operation of the paper machine, according to the invention other means are also used to achieve the desired effect.
The angle of release of the paper web from the centre roll of the press section in an arrangement, which uses an open transfer from one roll to another, varies according to the draw and the magnitude of machine direction fibre orientation. If the magnitude of machine direction fibre orientation has been altered in the manner described above, in such a way that the orientation is less at the edges of the web, this means that the angle of release from the centre roll of the press section will change, in such a way that the web tends to remain attached to the roll at the edges of the roll more than the centre. The result of this is that the edge areas become permanently stretched more than the centre which can be extremely detrimental to the machine's subsequent operation in the dryer section.
Thus, it would be good to have available a device, with the aid of which it would be possible to counteract the release angle problems caused by the shape of the flow guide. This is solved according to the invention as follows. Here reference is made to Figure 2.
The angle, at which the paper web 4 running around the centre roll 3 of the press section detaches from the roll, is adjusted in a controlled manner, by using an adjustable air jet over the width of the web. In practice, this means that, either experimentally or by theoretical calculation, the pressure profile in the cross direction of the web is determined, by means of which it is possible to achieve a uniform release angle profile.
One device, by means of which it is possible to create and use the afore mentioned profile, is a device developed by Runtech Systems Oy and marketed under the trademark Air Curtain. By means of the said device, which is marked with the reference number 5 in Figure 2, it is possible to create an air jet extending over the entire width of the web, the pressure profile of which can be varied over the entire width. The air jet being created is marked schematically with the reference number 6. The pressure of the air jet affects the angle of sheet release, thus by varying the cross machine pressure profile the release angle can be influenced in such a manner as to compensate for the variation in release angle created by the length profile of the flow guides in the headbox. By this means the adverse effects on dryer section runnability can be controlled while retaining the positive effects of minimising variation in paper properties dependent on the turbulence created by the length profile of the flow guides in the headbox.
One further development of the system described above is that, by using suitable means to measure the release angle, the information used by the said means can be used directly to adjust the operation of the air jet device 5, so that the desired release angle will be obtained. In practice, a laser camera, for example, is a suitable means for measuring the release angle.
The procedure described above is not the only one to which the principle of the present invention can be applied. With the aid of an airjet, it is possible to correct, more or less in real time, non-uniformity in the paper web arising from other reasons. Thus it is possible to quickly adjust the air-jet pressure and the release angle at any point whatever in the width of the web. The result will be paper of improved quality.
Variations are possible while remaining with the scope of protection of the inventive idea and the accompanying claims.
The angle of release of the paper web from the centre roll of the press section in an arrangement, which uses an open transfer from one roll to another, varies according to the draw and the magnitude of machine direction fibre orientation. If the magnitude of machine direction fibre orientation has been altered in the manner described above, in such a way that the orientation is less at the edges of the web, this means that the angle of release from the centre roll of the press section will change, in such a way that the web tends to remain attached to the roll at the edges of the roll more than the centre. The result of this is that the edge areas become permanently stretched more than the centre which can be extremely detrimental to the machine's subsequent operation in the dryer section.
Thus, it would be good to have available a device, with the aid of which it would be possible to counteract the release angle problems caused by the shape of the flow guide. This is solved according to the invention as follows. Here reference is made to Figure 2.
The angle, at which the paper web 4 running around the centre roll 3 of the press section detaches from the roll, is adjusted in a controlled manner, by using an adjustable air jet over the width of the web. In practice, this means that, either experimentally or by theoretical calculation, the pressure profile in the cross direction of the web is determined, by means of which it is possible to achieve a uniform release angle profile.
One device, by means of which it is possible to create and use the afore mentioned profile, is a device developed by Runtech Systems Oy and marketed under the trademark Air Curtain. By means of the said device, which is marked with the reference number 5 in Figure 2, it is possible to create an air jet extending over the entire width of the web, the pressure profile of which can be varied over the entire width. The air jet being created is marked schematically with the reference number 6. The pressure of the air jet affects the angle of sheet release, thus by varying the cross machine pressure profile the release angle can be influenced in such a manner as to compensate for the variation in release angle created by the length profile of the flow guides in the headbox. By this means the adverse effects on dryer section runnability can be controlled while retaining the positive effects of minimising variation in paper properties dependent on the turbulence created by the length profile of the flow guides in the headbox.
One further development of the system described above is that, by using suitable means to measure the release angle, the information used by the said means can be used directly to adjust the operation of the air jet device 5, so that the desired release angle will be obtained. In practice, a laser camera, for example, is a suitable means for measuring the release angle.
The procedure described above is not the only one to which the principle of the present invention can be applied. With the aid of an airjet, it is possible to correct, more or less in real time, non-uniformity in the paper web arising from other reasons. Thus it is possible to quickly adjust the air-jet pressure and the release angle at any point whatever in the width of the web. The result will be paper of improved quality.
Variations are possible while remaining with the scope of protection of the inventive idea and the accompanying claims.
Claims (5)
1. Method for compensating for faults, like uneven shrinkage, in a paper web in the press and drying sections of a paper machine, in which there is at least one open draw, characterized in that - the paper web, which has a property naturally or induced by a differing release angle from the centre roll of the press section over its width, is fed to the press and drying sections of the paper machine and - the web's (4) release angle is adjusted by directing an air jet at the web (6), which is located in cross-direction of the web and the pressure of which can be adjusted in the said direction.
2. Method according to claim 1, characterized in that, in order to compensate for the great shrinking tendency of the edge areas of the web, a flow guide/guides are used, the length of which in the edge areas of the web is greater that in the centre area, in order to reduce the machine direction orientation of the fibres.
3. Method according to claim 1, characterized in that the pressure of the air jet, in the cross direction of the web, on the web (4) detaching from the centre roll (3) of the press section, is adjusted in such a way that it is greater in the edge areas of the web than in the centre area of the web.
4. Method according to any of the above claims, characterized in that the release angle of the web from the roll is monitored in real time and the result of the monitoring is used directly and immediately to correct the pressure profile, in order to equalize the release angle of the web over the width of the web.
5. Method according to claim 4, characterized in that a suitable measuring device, for example a laser camera/cameras is/are used for the monitoring.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20070626 | 2007-08-20 | ||
| FI20070626A FI119441B (en) | 2007-08-20 | 2007-08-20 | Method for compensating deformation of a paper web |
| PCT/FI2008/050467 WO2009024649A1 (en) | 2007-08-20 | 2008-08-18 | Method for compensating for faults in a paper web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2697054A1 true CA2697054A1 (en) | 2009-02-26 |
Family
ID=38468695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2697054A Abandoned CA2697054A1 (en) | 2007-08-20 | 2008-08-18 | Method for compensating for faults in a paper web |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20110214829A1 (en) |
| EP (1) | EP2188445A4 (en) |
| JP (1) | JP2010537065A (en) |
| KR (1) | KR20100061691A (en) |
| CN (1) | CN101842534A (en) |
| BR (1) | BRPI0815625A2 (en) |
| CA (1) | CA2697054A1 (en) |
| FI (1) | FI119441B (en) |
| WO (1) | WO2009024649A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI119441B (en) * | 2007-08-20 | 2008-11-14 | Runtech Systems Oy | Method for compensating deformation of a paper web |
| EP3632279B1 (en) * | 2017-10-20 | 2024-05-29 | Corelex Shin-Ei Co., Ltd. | Log roll production device |
Family Cites Families (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3070901A (en) * | 1956-02-01 | 1963-01-01 | Svenska Flaektfabriken Ab | Guiding air-borne webs |
| GB993603A (en) * | 1962-11-15 | 1965-06-02 | Billeruds Ab | Method of producing extensible paper |
| US3399111A (en) * | 1966-12-01 | 1968-08-27 | Huyck Corp | Supplemental belt in combination with an endless belt in papermaking and method of installing the supplemental belt |
| US3856619A (en) * | 1973-03-07 | 1974-12-24 | Beloit Corp | Papermaking machine headbox with slice chamber containing flexible trailing elements having extended edges |
| JPS5924509A (en) * | 1982-07-30 | 1984-02-08 | Hitachi Ltd | Method and device for correcting asymmetry of material to be rolled in rolling mill |
| US4918836A (en) * | 1987-02-13 | 1990-04-24 | Beloit Corporation | Tail cutter apparatus and method |
| FI80090C (en) * | 1987-12-23 | 1990-04-10 | Ahlstroem Valmet | Method and apparatus in the inlet box of a paper machine for stable insulation of its lip beam |
| US5014447A (en) * | 1988-02-10 | 1991-05-14 | Thermo Electron Web Systems, Inc. | Positive pressure web floater dryer with parallel flow |
| US5232555A (en) * | 1988-09-29 | 1993-08-03 | Pulp And Paper Research Institute Of Canada | Wet cellulosic web transfer method using air doctor blade |
| US5022166A (en) * | 1990-06-07 | 1991-06-11 | Union Camp Corporation | Flutter suppression air foils |
| US5730923A (en) * | 1992-09-28 | 1998-03-24 | The University Of Tennessee Research Corporation | Post-treatment of non-woven webs |
| FI108054B (en) * | 1994-05-31 | 2001-11-15 | Metso Paper Inc | Method for stabilizing the course of a paper web in conjunction with a paper guide roll especially between the press portion and the drying portion and apparatus for carrying out the method |
| DE19542448A1 (en) * | 1995-11-14 | 1997-05-15 | Voith Sulzer Papiermasch Gmbh | Method and device for determining the effect of adjusting actuators |
| US5830321A (en) * | 1997-01-29 | 1998-11-03 | Kimberly-Clark Worldwide, Inc. | Method for improved rush transfer to produce high bulk without macrofolds |
| FI111469B (en) * | 1996-12-16 | 2003-07-31 | Metso Paper Inc | Method and system for observing the unloading phase of the web |
| CA2206382C (en) * | 1997-05-28 | 2000-08-22 | Asea Brown Boveri Inc. | Curl and profile correction with high velocity hoods |
| FI108063B (en) * | 1997-09-09 | 2001-11-15 | Runtech Systems Oy | Method and apparatus for treating a web of material |
| US6004432A (en) * | 1998-01-28 | 1999-12-21 | Beloit Technologies, Inc. | Sheet turn with vectored air supply |
| US6207020B1 (en) * | 1998-05-12 | 2001-03-27 | International Paper Company | Method for conditioning paper and paperboard webs |
| DE19841639A1 (en) * | 1998-09-11 | 2000-03-16 | Voith Sulzer Papiertech Patent | Web guide |
| FI113883B (en) * | 1999-08-12 | 2004-06-30 | Runtech Systems Oy | Methods and devices for processing a web of material and for controlling the behavior of the web of material |
| DE10004369A1 (en) * | 2000-02-02 | 2001-08-09 | Voith Paper Patent Gmbh | Transfer of an entry strip of a paper web |
| DE10106684A1 (en) * | 2001-02-14 | 2002-08-29 | Voith Paper Patent Gmbh | Slat of a headbox of a paper, cardboard or tissue machine |
| FI121240B (en) * | 2001-03-23 | 2010-08-31 | Metso Paper Automation Oy | Arrangements at a paper machine as well as a blow box |
| DE10115618A1 (en) * | 2001-03-26 | 2002-10-02 | Voith Paper Patent Gmbh | Method and device for transferring a web |
| US20030183353A1 (en) * | 2001-12-10 | 2003-10-02 | Metso Paper Karlstad Ab | Press section tail threading |
| FI20025055A0 (en) * | 2002-03-27 | 2002-12-03 | Metso Paper Inc | Method for controlling a paper or board machine |
| EP1501977B1 (en) * | 2002-04-22 | 2011-01-05 | Stora Enso AB | Device and method for on-line control of the fibre direction of a fibre web |
| FI116389B (en) * | 2002-07-16 | 2005-11-15 | Millidyne Oy | Procedure for adjusting surface properties |
| DE10242868A1 (en) * | 2002-09-17 | 2004-03-25 | Voith Paper Patent Gmbh | Papermaking machine headbox has sandwich construction guide vane incorporating sliding tab moving back and forth by compression spring and steel cable attached to spindle |
| US6698681B1 (en) * | 2002-10-04 | 2004-03-02 | Kimberly-Clark Worldwide, Inc. | Apparatus and method for winding paper |
| DE20309429U1 (en) * | 2003-06-17 | 2003-09-18 | Reifenhäuser GmbH & Co. Maschinenfabrik, 53844 Troisdorf | Extraction device of a tubular film extrusion system |
| US7513975B2 (en) * | 2003-06-25 | 2009-04-07 | Honeywell International Inc. | Cross-direction actuator and control system with adaptive footprint |
| US20060027620A1 (en) * | 2004-08-05 | 2006-02-09 | Voith Paper Patent Gmbh | Method and apparatus for transferring a paper web |
| US7311234B2 (en) * | 2005-06-06 | 2007-12-25 | The Procter & Gamble Company | Vectored air web handling apparatus |
| FI20060757L (en) * | 2006-08-25 | 2008-02-26 | Runtech Systems Oy | Method and device for guiding a paper web or the like |
| FI119441B (en) * | 2007-08-20 | 2008-11-14 | Runtech Systems Oy | Method for compensating deformation of a paper web |
| ATE510959T1 (en) * | 2007-12-31 | 2011-06-15 | Metso Paper Inc | ARRANGEMENT AND METHOD FOR SAVING ENERGY IN THE DRYING AREA OF A PAPER MACHINE OR THE LIKE |
| DE102009022871A1 (en) * | 2009-05-27 | 2010-12-02 | Metso Paper, Inc. | Method for wireless feeding of web into single-wire extension of dryer section of e.g. paper machine, involves guiding insertion web from preceding drying cylinder to next drying cylinder, and detaching insertion web from preceding cylinder |
-
2007
- 2007-08-20 FI FI20070626A patent/FI119441B/en not_active IP Right Cessation
-
2008
- 2008-08-18 US US12/674,185 patent/US20110214829A1/en not_active Abandoned
- 2008-08-18 JP JP2010521453A patent/JP2010537065A/en active Pending
- 2008-08-18 CN CN200880107461A patent/CN101842534A/en active Pending
- 2008-08-18 EP EP08787740.3A patent/EP2188445A4/en not_active Withdrawn
- 2008-08-18 WO PCT/FI2008/050467 patent/WO2009024649A1/en active Application Filing
- 2008-08-18 KR KR1020107005942A patent/KR20100061691A/en not_active Application Discontinuation
- 2008-08-18 BR BRPI0815625-5A2A patent/BRPI0815625A2/en not_active IP Right Cessation
- 2008-08-18 CA CA2697054A patent/CA2697054A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP2188445A1 (en) | 2010-05-26 |
| EP2188445A4 (en) | 2014-01-08 |
| WO2009024649A1 (en) | 2009-02-26 |
| CN101842534A (en) | 2010-09-22 |
| FI20070626A0 (en) | 2007-08-20 |
| BRPI0815625A2 (en) | 2015-02-18 |
| JP2010537065A (en) | 2010-12-02 |
| FI119441B (en) | 2008-11-14 |
| KR20100061691A (en) | 2010-06-08 |
| US20110214829A1 (en) | 2011-09-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20130624 |
|
| EEER | Examination request |
Effective date: 20130625 |
|
| FZDE | Discontinued |
Effective date: 20140819 |