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WO1999066125A1 - Methode de regulation d'un rouleau reglable par zone - Google Patents

Methode de regulation d'un rouleau reglable par zone Download PDF

Info

Publication number
WO1999066125A1
WO1999066125A1 PCT/FI1999/000515 FI9900515W WO9966125A1 WO 1999066125 A1 WO1999066125 A1 WO 1999066125A1 FI 9900515 W FI9900515 W FI 9900515W WO 9966125 A1 WO9966125 A1 WO 9966125A1
Authority
WO
WIPO (PCT)
Prior art keywords
regulation
profile
zones
roll
nip
Prior art date
Application number
PCT/FI1999/000515
Other languages
English (en)
Inventor
Pekka Kivioja
Juha Ehrola
Original Assignee
Valmet Corporation
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 Valmet Corporation filed Critical Valmet Corporation
Priority to AU47843/99A priority Critical patent/AU4784399A/en
Priority to DE19983348T priority patent/DE19983348T1/de
Publication of WO1999066125A1 publication Critical patent/WO1999066125A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—Regulating the pressure
    • D21G1/0046—Regulating the pressure depending on the measured properties of the calendered web

Definitions

  • the invention concerns a method for regulation of a roll adjustable in zones, which roll adjustable in zones forms a nip with a backup roll, through which nip a paper or board web is passed in view of controlling the cross-direction profile of the web and which nip is loaded adjustably by means of hydraulic glide shoes which form the zones in the roll adjustable in zones, in which connection, in the method, the cross- direction profile of the web is measured constantly after the nip, and a differential profile between the measured cross-direction profile and the target cross-direction profile is computed, which differential profile is used as a regulation parameter in a closed regulation circuit so as to regulate the nip profile to the desired form.
  • nip pressure i.e. the nip profile in the axial direction of the rolls, remains invariable or that this profile can be adjusted in the desired way, for example, in view of controlling the cross-direction moisture profile or thickness profile or any other, corresponding property profile of the web.
  • variable-crown rolls or rolls adjustable in zones are used as comprise a stationary roll axle and a roll mantle arranged revolving around said axle as well as hydraulically loaded glide shoe arrangements fitted between the roll mantle and the axle and acting upon the inner face of the mantle, by means of which glide shoes the axial profile of the mantle at the nip can be aligned or regulated in the desired way.
  • two or more adjacent glide shoes always form one zone, which is controlled by means of a zone-specific hydraulic valve.
  • the number of the glide shoes included in different zones can differ from zone to zone in a way required by a purposeful control of the compression force between the zone roll and its backup roll.
  • the object of the present invention is to provide a significant improvement over the prior-art methods for regulation of the nip profile by means of a roll adjustable in zones.
  • the method in accordance with the invention is mainly characterized in that, in the method, a regulation model is used in which substantially all the forces applied to the roll mantle are formed as models each of them separately so that these forces are also treated each of them separately in the regulation process.
  • elements are used as an aid by whose means it is possible to take into account local deformations, for example shell elements and/or solid elements.
  • the present invention provides significant advantages, and of these advantages it is possible to state, among other things, that, by means of the method of regulation in accordance with the present invention, in the regulation of rolls adjustable in zones, a considerably better accuracy is achieved, as compared with earlier solutions, because the model of regulation on which the method of regulation in accordance with the invention is based corresponds to the factual conduct of the constructions better. Besides improved accuracy, it is a further advantage that, when the method of regulation in accordance with the invention is used, it is possible to carry out extensive profiling reliably, and, further, the nips can be operated in curved form.
  • Such curved nips are used commonly, for example, in soft calenders and in OptiLoadTM calenders.
  • An OptiLoadTM calender is described, for example, in the US Patent 5,438,920.
  • Figure 1 is a schematic illustration of a pair of rolls which comprises a roll adjustable in zones and a backup roll and which pair of rolls forms a nip.
  • Figure 2 is a schematic illustration of a closed circuit of regulation for use in regulation of the nip profile.
  • the roll adjustable in zones has been denoted generally with the reference numeral 10.
  • the roll 10 comprises a stationary roll axle 11, on which a tubular roll mantle 12 has been fitted revolving.
  • the roll mantle 12 is supported on the roll axle 11 by means of hydraulic glide shoes 13 acting upon the inner face of the roll mantle, by means of which glide shoes the nip N is loaded adjustably.
  • the roll 10 is also provided with backup shoes 13a, which act in a direction opposite to the glide shoes 13 in the nip plane.
  • the glide shoes 13 have been fitted in a certain way in groups and divided into zones Zi ...Z 4 in the axial direction of the roll 10 so that each zone is regulated separately.
  • end bearings 14 it is possible to use either conventional roller bearings or, in their place, the end bearings 14 can be accomplished as modern glide bearings. In order that the regulation of the profile in the nip N could be carried out reliably over the entire axial length of the nip, it is, however, important that the bearings 14 have been accomplished so that they permit radial movement of the roll mantle 12 also in the areas of said bearings.
  • the reference numeral 70 denotes a regulation and setting device, which communicates, through pressure ducts 15, with the glide shoes
  • the roll 10 adjustable in zones forms a nip N with the backup roll 20.
  • the nip N can be, for example, a press nip, an equalizing nip, a size-press nip, a calendering nip, or equivalent.
  • the paper or board web W has been passed through said nip N.
  • Fig. 2 illustrates a closed circuit of regulation, which is used in compliance with the method in accordance with the present invention for regulation of the nip profile.
  • the linear load in the nip N is regulated by means of regulation of the set pressures passing to the hydraulic glide shoes 13 and backup shoes 13a in the roll.
  • a paper or board web W or equivalent has been passed to run through the nip N, and by means of said nip, which is, for example, a calendering nip, attempts are made to produce a certain effect in the web W that runs through the nip N. In the case of a calender, attempts are made to keep the distribution of the linear load in the nip, i.e.
  • the data have been fed concerning the nip profile aimed at, i.e. the effect that is supposed to be produced by means of the nip N in the web W that runs through the nip.
  • a measurement equipment 30 On the run of the web W after the nip N, a measurement equipment 30 has been fitted, by whose means the cross-direction profile of the web W is measured con- stantly in order to find out how well the cross-direction profile aimed at is achieved by means of the set values that have been fed into the zones Z j .. ⁇ and backup zones Za j ...Za 4 in the roll 10 adjustable in zones.
  • the equipment 30 for measurement of the cross-direction profile can comprise, for example, a measurement beam passing across the web W, on which beam measurement detectors have been installed with a specified spacing in the cross-direction of the web so as to measure the cross-direction profile.
  • the measurement equipment can also comprise a measurement head or equivalent traversing back and forth across the web W.
  • the computing unit 50 compares the measured profile with the target profile and, on this basis, performs a calculation in order to form an error profile or a differential profile, i.e. in order to find out to what extent the measured profile differs from the target profile. Further, based on the differential profile thus determined, this computing unit 50 carries out a computation in order to regulate the linear load so that, in the nip N, the cross-direction profile aimed at could be achieved based on the computed regulation parameter.
  • the target 51 of linear load or the regulation parameter is, however, not transmitted directly to the regulation and setting device 70 that regulates the set pressures in the zones Z 1 ...Z and in the backup zones Za j ...Za , but this target of linear load, i.e. regulation parameter computed in compliance with the differential profile, or a corresponding control signal is fed into an optimizing part 60, which is included in the closed regulation circuit and which contains an optimizing routine.
  • the optimizing part contains advance information on the profile responses of the actuators and on the physical limitations of the actuators and of the whole roll 10, and so also on factors of non-linearity related to the roll. Further, the optimizing part contains information on the cross-effects of different actuators, i.e.
  • the novel model of regulation which is based on creating a model of a roll adjustable in zones by means of shell elements, corresponds to the factual conduct of the roll mantle better.
  • all forces applied to the roll mantle 12 have been formed as separate models in order that they could also be treated separately.
  • certain factors of non-linearity must be taken into account when the distribution of linear load is computed.
  • Such forces operating in a non-linear way are, among other things, bearing forces whose direction is changed. A change in the direction of bearing forces comes out quite well, for example, in supercalenders, in which running takes place with a what is called zero load or very close to this load.
  • the novel optimizing routine which is employed with the novel computing model, is, besides linear limitations, also capable of dealing with non-linear limitations.
  • One such force that operates in a non-linear way is, for example, a bearing force, as was already stated above, whose response is changed in accordance with whether the direction of the force is towards the nip or away from the nip.
  • a bearing force as was already stated above, whose response is changed in accordance with whether the direction of the force is towards the nip or away from the nip.
  • such a force is illustrated so that just one of the forces can be different from the minimum, for example, in the following way:
  • the optimizing part 60 in addition to the information on the target 51 of linear load computed in accordance with the differential profile, the necessary data 52 are fed, among other things, concerning the bearing forces, the pressures in the backup zones Za j ...Za 4 and their effects on the linear load, etc. Based on these data, the optimizing part 60 computes new set values at the same time for all actuators in order to minimize the overall error of cross-direction profile and the differential profile as well as determines the control necessary for the differential profile at each particular time.
  • the optimizing part 60 takes into account the cross-effects of all actuators, among other things of the zones Z j ...Z 4 in the roll 10, the effects of the backup zones Za ⁇ . -Za ⁇ the effects of bearing forces, etc. and the physical limitations of the actuators, besides the linear limitations also the nonlinear limitations.
  • the optimizing part attempts to take maximal advantage of the whole of the profiling potential of the roll 10 adjustable in zones.
  • the new set values of the actuators are transmitted as input data 61, i.e. as regulation parameters, to the regulation and setting device 70 for regulation of the set pressures for the zones and backup zones.
  • the response of a regulation to a regulation parameter is very precisely known, for which reason, depending on the optimizing routine, i.e. on the quality of the model employed by the optimizing, the speed of regulation can be increased considerably in this way.
  • the required movement of the actuators placed at the regulation locations is determined so that the known profile response of each regulation location, i.e.
  • the change in the cross-direction profile caused by a movement of the actuator is compared with the differential profile prevailing at said regulation location and that corresponding regulation impulses are given to the actuators, while taking into account the cross-effects, physical limitations and, in particular, non-linear limitations of the actuators so as to correct the differential profile.
  • this method it is possible, among other things, to predict a need of profiling after a break and, thus, to shorten the time of recovery after the break.
  • measure- ment of the profile and regulation carried out on the basis of the measurement are carried out during running constantly and without interruption.

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  • Paper (AREA)

Abstract

L'invention concerne une méthode de régulation d'un rouleau réglable par zone, lequel (10) forme une ligne de contact (N) avec un rouleau de support (20). Une bande de papier ou de carton (W) est passée dans la ligne de contact (N) de sorte que le profil sens travers de la bande (W) soit modulé, et la ligne de contact (N) est chargée de manière réglable au moyen de patins hydrauliques (13) qui forment les zones du rouleau (10) réglable par zone. Dans ledit procédé, le profil sens travers de la bande (W) est mesuré constamment après la ligne de contact (N) et un profil différentiel entre le profil sens travers mesuré et le profil sens travers cible est calculé, le profil différentiel étant utilisé en tant que paramètre de régulation dans un circuit de régulation fermé de sorte que le profil de la ligne de contact soit modulé selon la forme voulue. Dans la méthode de l'invention, un modèle de régulation est utilisé, dans lequel sensiblement toutes les forces appliquées au surtout (12) du rouleau sont formées chacune séparément comme des modèles de sorte qu'elles soient traitées également séparément dans le processus de régulation.
PCT/FI1999/000515 1998-06-15 1999-06-14 Methode de regulation d'un rouleau reglable par zone WO1999066125A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU47843/99A AU4784399A (en) 1998-06-15 1999-06-14 Method for regulation of a roll adjustable in zones
DE19983348T DE19983348T1 (de) 1998-06-15 1999-06-14 Verfahren zum Regulieren einer Walze, die in Zonen einstellbar ist

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981385 1998-06-15
FI981385A FI111744B (fi) 1998-06-15 1998-06-15 Menetelmä vyöhykesäädettävän telan säätämiseksi

Publications (1)

Publication Number Publication Date
WO1999066125A1 true WO1999066125A1 (fr) 1999-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000515 WO1999066125A1 (fr) 1998-06-15 1999-06-14 Methode de regulation d'un rouleau reglable par zone

Country Status (4)

Country Link
AU (1) AU4784399A (fr)
DE (1) DE19983348T1 (fr)
FI (1) FI111744B (fr)
WO (1) WO1999066125A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001073197A1 (fr) * 2000-03-29 2001-10-04 Metso Paper, Inc. Procede et systeme de regulation de l'epaisseur de la bande et procede de regulation du calandrage
WO2002016694A1 (fr) * 2000-08-24 2002-02-28 Metso Paper, Inc. Procede de controle d"une ou plusieurs variables de qualite de surface d"une bande de fibre dans une calandre a sabot
WO2002022949A1 (fr) * 2000-09-18 2002-03-21 Metso Paper, Inc. Controle a sens travers d'une bande de papier
WO2003078729A1 (fr) * 2002-03-18 2003-09-25 Erno Keskinen Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs
WO2006016005A1 (fr) * 2004-08-13 2006-02-16 Avantone Oy Dispositif de gaufrage muni d'un cylindre a deviation compensee
WO2006016006A1 (fr) * 2004-08-13 2006-02-16 Avantone Oy Dispositif de gaufrage et son procédé de réglage
WO2006040399A1 (fr) * 2004-10-14 2006-04-20 Metso Paper, Inc. Procede pour compenser des variations de chargement de ligne de contact entrainees par des erreurs de forme d’un rouleau
EP2669430A1 (fr) * 2012-05-30 2013-12-04 Metso Paper Inc. Agencement pour commander les vibrations dans une machine à bande fibreuse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI116091B (fi) * 2000-04-12 2005-09-15 Metso Paper Inc Menetelmä liukulaakeripaineen mittaamiseksi kiinteävaippaisessa taipumakompensoidussa telassa

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
US4903517A (en) * 1987-05-09 1990-02-27 Kleinewefers Gmbh Method of and apparatus for regulating the operation of calenders and like machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
US4903517A (en) * 1987-05-09 1990-02-27 Kleinewefers Gmbh Method of and apparatus for regulating the operation of calenders and like machines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001073197A1 (fr) * 2000-03-29 2001-10-04 Metso Paper, Inc. Procede et systeme de regulation de l'epaisseur de la bande et procede de regulation du calandrage
WO2002016694A1 (fr) * 2000-08-24 2002-02-28 Metso Paper, Inc. Procede de controle d"une ou plusieurs variables de qualite de surface d"une bande de fibre dans une calandre a sabot
US7235157B2 (en) 2000-08-24 2007-06-26 Metso Paper, Inc. Method for controlling one or more surface quality variables of a fiber web in a shoe calender
WO2002022949A1 (fr) * 2000-09-18 2002-03-21 Metso Paper, Inc. Controle a sens travers d'une bande de papier
WO2003078729A1 (fr) * 2002-03-18 2003-09-25 Erno Keskinen Procede de determination d'une force de ligne et de distribution d'une force de ligne constante entre deux rouleaux rotatifs
WO2006016005A1 (fr) * 2004-08-13 2006-02-16 Avantone Oy Dispositif de gaufrage muni d'un cylindre a deviation compensee
WO2006016006A1 (fr) * 2004-08-13 2006-02-16 Avantone Oy Dispositif de gaufrage et son procédé de réglage
WO2006040399A1 (fr) * 2004-10-14 2006-04-20 Metso Paper, Inc. Procede pour compenser des variations de chargement de ligne de contact entrainees par des erreurs de forme d’un rouleau
EP2669430A1 (fr) * 2012-05-30 2013-12-04 Metso Paper Inc. Agencement pour commander les vibrations dans une machine à bande fibreuse

Also Published As

Publication number Publication date
FI981385A0 (fi) 1998-06-15
FI981385A7 (fi) 1999-12-16
AU4784399A (en) 2000-01-05
FI111744B (fi) 2003-09-15
DE19983348T1 (de) 2001-06-13

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