WO2009024649A1 - Method for compensating for faults in a paper web - Google Patents

Method for compensating for faults in a paper web Download PDF

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Publication number
WO2009024649A1
WO2009024649A1 PCT/FI2008/050467 FI2008050467W WO2009024649A1 WO 2009024649 A1 WO2009024649 A1 WO 2009024649A1 FI 2008050467 W FI2008050467 W FI 2008050467W WO 2009024649 A1 WO2009024649 A1 WO 2009024649A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
paper
centre
adjusted
release angle
Prior art date
Application number
PCT/FI2008/050467
Other languages
French (fr)
Inventor
Kimmo Loippo
Michael Odell
Original Assignee
Runtech Systems Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Runtech Systems Oy filed Critical Runtech Systems Oy
Priority to CA2697054A priority Critical patent/CA2697054A1/en
Priority to CN200880107461A priority patent/CN101842534A/en
Priority to BRPI0815625-5A2A priority patent/BRPI0815625A2/en
Priority to US12/674,185 priority patent/US20110214829A1/en
Priority to JP2010521453A priority patent/JP2010537065A/en
Priority to EP08787740.3A priority patent/EP2188445A4/en
Publication of WO2009024649A1 publication Critical patent/WO2009024649A1/en

Links

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

Definitions

  • the present invention relates to a method for compensating for faults, such non uniform shrinkage, in a paper web.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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;
  • Figure 2 shows a second sub-area of the invention, in connection with the centre roll of the press section.
  • 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.
  • Figure 1 One example is shown in Figure 1 , though only by way of example and not restrictively.
  • a flow guide 1 which is generally a plate-like piece.
  • 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.
  • 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.
  • 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.
  • the said device which is marked with the reference number 5 in Figure 2
  • 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.
  • 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.
  • a laser camera for example, is a suitable means for measuring the release angle.

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. 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. 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.

Claims

Claims
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.
PCT/FI2008/050467 2007-08-20 2008-08-18 Method for compensating for faults in a paper web WO2009024649A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA2697054A CA2697054A1 (en) 2007-08-20 2008-08-18 Method for compensating for faults in a paper web
CN200880107461A CN101842534A (en) 2007-08-20 2008-08-18 Method for compensating for faults in a paper web
BRPI0815625-5A2A BRPI0815625A2 (en) 2007-08-20 2008-08-18 Method for compensating for failures in a paper strip
US12/674,185 US20110214829A1 (en) 2007-08-20 2008-08-18 Method for compensating for faults in a paper web
JP2010521453A JP2010537065A (en) 2007-08-20 2008-08-18 Method for correcting defects in a web
EP08787740.3A EP2188445A4 (en) 2007-08-20 2008-08-18 Method for compensating for faults in a paper web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20070626A FI119441B (en) 2007-08-20 2007-08-20 Method for compensating deformation of a paper web
FI20070626 2007-08-20

Publications (1)

Publication Number Publication Date
WO2009024649A1 true WO2009024649A1 (en) 2009-02-26

Family

ID=38468695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050467 WO2009024649A1 (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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110214829A1 (en) * 2007-08-20 2011-09-08 Runtech Systems Oy Method for compensating for faults in a paper web

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Publication number Priority date Publication date Assignee Title
JP6517428B1 (en) 2017-10-20 2019-05-22 コアレックス信栄株式会社 Log roll manufacturing equipment

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Also Published As

Publication number Publication date
KR20100061691A (en) 2010-06-08
EP2188445A1 (en) 2010-05-26
CA2697054A1 (en) 2009-02-26
JP2010537065A (en) 2010-12-02
FI20070626A0 (en) 2007-08-20
CN101842534A (en) 2010-09-22
FI119441B (en) 2008-11-14
BRPI0815625A2 (en) 2015-02-18
EP2188445A4 (en) 2014-01-08
US20110214829A1 (en) 2011-09-08

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