WO2009071360A1 - Machine à papier et procédé pour influencer la masse d'eau par zones - Google Patents

Machine à papier et procédé pour influencer la masse d'eau par zones Download PDF

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Publication number
WO2009071360A1
WO2009071360A1 PCT/EP2008/063520 EP2008063520W WO2009071360A1 WO 2009071360 A1 WO2009071360 A1 WO 2009071360A1 EP 2008063520 W EP2008063520 W EP 2008063520W WO 2009071360 A1 WO2009071360 A1 WO 2009071360A1
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WO
WIPO (PCT)
Prior art keywords
zonal
water weight
fibrous web
additives
paper machine
Prior art date
Application number
PCT/EP2008/063520
Other languages
German (de)
English (en)
Inventor
Armin Bauer
Rudolf Münch
Jörg Spindler
Niels Hardt
Oliver Kaufmann
Jens Haag
Hartmut Abel
Original Assignee
Voith Patent Gmbh
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 Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2009071360A1 publication Critical patent/WO2009071360A1/fr

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Classifications

    • 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
    • D21F1/08—Regulating consistency
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section

Definitions

  • the present invention relates to a method for adjusting, in particular control, the water weight of a pulp of a paper machine, in particular a dilution hydrogen casserole, wherein the pulp is guided as at least one fibrous web. Furthermore, the present invention relates to a dewatering apparatus, particularly as part of a paper machine implementing the method.
  • the quality of the paper which is produced with the aid of a water-based paper machine, such as the basis weight (FG) 1 soft also referred to as basis weight and measured according to DIN ISO 536 depends crucially on the processes in the wet end of the paper machine. off.
  • FG basis weight
  • DIN ISO 536 DIN ISO 536
  • the pulp that is to say the aqueous pulp or wood pulp suspension
  • headbox a device
  • this screen for example in the case of the long-wheel machine, it is usually a close-meshed wire screen in the form of an endless circulating belt.
  • the sieve can also consist of a particularly coarse-meshed fabric, such as a plastic net.
  • the pulp After application to the wire, the pulp continuously loses water due to gravity or additional vacuum extraction by means of dewatering elements, that is, the water weight of the pulp on the wire continuously decreases in the machine direction (MD).
  • MD machine direction
  • the formation of the pulp into paper, that is, the sheet formation » allows. Also in the subsequent lots of paper machine, such as the press and the dryer section, the water weight is further reduced.
  • a paper machine can be considered essentially as a dewatering device for the pulp.
  • the machine direction is usually referred to as the direction in which the pulp is moved by the paper machine during the papermaking process.
  • the consistency which is essentially the water weight, of the pulp in the cross machine direction (CD 1 Gross Direction), that is in the direction normal to the machine direction, is usually set first by means of dilution water.
  • This setting is therefore useful because, for example, because of iokal different lip openings of the headbox or because of differential drainage in the cross-machine direction on the screen to FG / Otro deviations in the cross-machine direction of the fibrous web, that is to deviations of the net weight in the cross-machine direction of the oven-dry paper can come. Such deviations have a detrimental effect on the formation cross profile and are therefore undesirable.
  • a headbox operating with dilution water is referred to as a diluent hydrogen feed.
  • WO 99/64963 A1 a shear and formation control or regulation for the pulp of a paper machine is known.
  • the main factors influencing the formation and strength of the paper produced are (1) the ratio of the velocity of the pulp as it exits the diluent solution to the speed of the sieve, (2) the angle between the pulp jet of the dilution hydrogen casserole and the sieve surface and (3) the rate of dehydration of the pulp indicated on the sieve.
  • the document describes a water-weight sensor which can be arranged under the sieve and with which three properties of a material, in particular the pulp of a paper machine, can be measured: the conductivity or the resistance, the dielectric constant and the distance of the material from the water-weight sensor, depending on the Material one or more than one of these characteristics dominates.
  • the response time of such a water-weight sensor is about one millisecond, so that sampling frequencies of about 600 measurements per second can be achieved.
  • the water weight sensors are positioned in the paper machine along the MD direction, with the individual sensors touching the wire to maintain the distance between the pulp and the sensor.
  • a sensor array is used to measure water weight in the MD direction on the screen of a Fourdrinier paper machine and to make water weight or drainage profiling.
  • the control system can as a result detect and regulate the speed behavior, ie the ratio of fiber jet velocity to wire speed, in order to achieve optimum formation, ie batt formation and strength.
  • the optimum dewatering profile can be discretely measured and recorded or stored spatially and temporally on a paper machine optimally configured by hand and with the aid of laboratory measurements for a particular type of paper.
  • the records of this optimal dewatering profile are subsequently processed by curve fitting to obtain parameterized curves (setpoint!), Such as exponentials, that approximate and interpolate the datasets while smoothing out unwanted noise in the dataset values cause.
  • the goal is to reproduce the optimum drainage profile (nominal profile).
  • machine parameters such as pulp jet velocity, fibrous web speed, wire speed or drive load controller are adjusted to bring the deviating value closer to the setpoint.
  • WO 99/64963 A1 draws the attention of the skilled person to the sensor arrangement and the detection of the water weight profile in the MD direction, as well as for guiding the papermaking process close to the target profile on the control of conventional machine parameters such as the speed ratio of Faserstoffstrahi and sieve, disadvantageous is in this context that an influence, in particular control, of the transverse profile of the method described in this document or by the device of this document is not performed.
  • EP 1 021 729 B1 describes a control of the wet end of a paper machine, in particular with the aid of the addition of paper chemicals.
  • Paper chemicals are known to be used to impart certain properties to the paper or to improve certain paper properties or to achieve or support other necessary goals, such as improved control of the process.
  • paper chemicals such as dewatering aids, defoamers, retention aids, that is, agents that improve the retention of fines and fillers on the fiber surface during dewatering, while accelerating dewatering through the papermaking fabric and thus drying, pitch detergents (pitch dispersants). , Slimicides or corrosion protection agents used.
  • the production of quality paper requires the addition of appropriate amounts of these paper chemicals.
  • the addition of paper chemicals and the subsequent reactions or interactions between the paper chemicals and the aqueous pulp suspension, as well as the chemical-physical Processes in the wet end are also referred to in the jargon as wet-end chemistry.
  • non-fibrous additives especially solids.
  • the corresponding paper chemicals in particular the solids among the paper chemicals, to form bonds or aggregates which act on the crosswise caused by the dewatering on and in the fibrous web - or shear forces can withstand.
  • This is achieved through the use of synthetic polymers.
  • Correct wet-end chemistry in particular control or regulation of the wet-end chemistry, is necessary in order to produce a uniformly high-quality paper.
  • EP 1 021 729 B1 describes a sensor arrangement of water-weight sensors in the CD direction.
  • Each water weight sensor of the sensor array is located below a portion of the screen which carries the pulp in a fibrous web and measures the water weight of the pulp passing above the sensor array.
  • the sensor arrangement provides a continuous measurement of the entire pulp along the CD direction at the point where the fibrous web passes the sensor array.
  • a profile of a variety of water weight measurements at different positions in the CD direction is reiteratelit.
  • a certain disadvantage of the two last-mentioned documents is that the skilled person can not infer from them which sites or places the wet-end chemistry can or should be influenced in the above-described sense, in short the skilled person does not learn where to add the paper chemicals. to guide the process close to the identified soil profile.
  • WO 99/55959 A1 discloses a device and a method for sheet measurement and control in paper machines.
  • the document describes inter alia the measurement of CD profiles, in particular water weight profiles in the cross-machine direction of the paper machine with the aid of water-weight sensors.
  • the CD water weight Profii is obtained instantaneously, whereby the MD and CD changes are determined substantially decoupled.
  • the raw material supply rate at the beginning of the wet end, the steam quantity regulation in the dryer section or the variation of the roller contact pressure in the press section are mentioned as engagement points for the control.
  • There are the possibilities of intervention in numerous, independently controllable or controllable actuators mentioned, which extend in each control range across the width of the pulp.
  • the headbox the steam generation with numerous steam actuators, which regulate the applied to the individual zones across the sheet amount of heat, called.
  • segmented quay rolls comprise a plurality of roller pressure control actuators applied to the biatt between the rolls in individual zones in the cross-machine direction.
  • the control can be carried out by a conditioner or by means of control systems which automatically adjust actuators in the cross machine direction while evaluating signals from scanners.
  • Factors for non-uniform dewatering in the cross-machine direction which as a result are responsible for fluctuations in the CD profile of the paper include uneven supply of the pulp to the fabric pulp, clogging of the plastic mesh fabric of the fabric, differential strain of the fabric and the unbalanced vacuum suction.
  • the pulp is fed as at least one fibrous web, the fibrous web comprises at least two zones in the cross machine direction.
  • the fibrous material for influencing, in particular for the stabilization and homogenization its zonal water weight additives zonewise zugebbar. Due to the additives, the dewatering of the pulp can be influenced zone by zone. The dehydration can be increased or reduced in particular by zones by means of the additive addition. The addition of additives in zones makes it possible to even out and stabilize the retention. This results in a more stable and uniform ash transverse profile, and as a result a more stable and uniform formation. Zonal formation disorders, such as displacements, can be reliably avoided in this way.
  • the additives are added according to the invention by means of zonal dispensing devices distributed over the fibrous web of the paper machine.
  • the addition device is preferably at least one tube as the zonal water weight application device.
  • the adding device can preferably be realized by a plurality of tubes that transversely cross the machine direction. Since the adding devices are distributed zonally over the fibrous web, the paper chemicals can advantageously be introduced at points in the paper making process where they are needed, for example at points where the retention of fillers is to be increased or reduced.
  • the adding device is preferably equipped with at least one nozzle.
  • the nozzle preferably influences the flow and distribution of the additives onto the fibrous web of the paper machine in the respective zone on the pipe. In particular, the nozzle can allow the additives to flow concentratedly onto the fibrous web.
  • the nozzle may preferably apply the additives distributed uniformly over a zone on the fibrous web. Due to the defined application of the additives to the fibrous web through the nozzle, it is advantageously possible to adjust or control the retention in the respective zone in accordance with the requirements of the overall process.
  • the adjustment of the individual zonal additions takes place with the aid of control circuits.
  • the control circuits preferably the pressure and / or the flow of the addition devices are adjustable.
  • the method preferably carries out the selection of the adjustment of the additives with respect to type and quantity autonomously and in a self-controlling manner. This makes it possible to adjust the required amounts of added additives such as retention agents in a defined manner and in accordance with the requirements of modern quality assurance.
  • the differential pressure control achieves cross-linking of the individual zone regulators, which, as a result, advantageously leads to an improvement in the formation transverse profile of the paper produced.
  • the setting of the zonal additions can be performed manually by a, preferably human, operator according to the invention. This is particularly advantageous when determining target profiles for new paper grades.
  • Automated control by means of a microprocessor advantageously increases the productivity of the paper machine and greatly complies with the quality assurance of the paper industry.
  • At least one Ventii in particular a ball valve, usable.
  • a valve in particular a ball valve
  • the addition streams that is, the addition amounts per unit time of additives in the individual zones can be advantageously controlled reliably.
  • the zonal water weight is measured transversely to the machine running direction.
  • the sensor arrangement is preferably arranged behind or in at least one dewatering element of the wet end of the paper machine.
  • At least one multi-dimensional sensor arrangement of water-weight sensors is present for zonal detection of the dewatering in the MD direction.
  • the water-weight sensors are distributed both in the CD and in the MD direction, that is to say two-dimensionally.
  • the multi-dimensional, in particular two-dimensional, sensor arrangement advantageously achieves the areal detection of the water weight of the fibrous web.
  • the water weight for each zone can be regulated separately to at least one arbitrarily selectable point along the fibrous web of the paper machine in the MD direction. Due to the zonal regulation to an arbitrary position along the fibrous web advantageously the ash profile and consequently the formation profile can be favorably influenced.
  • the drainage curve can be predetermined for each individual zone and can be adjusted separately. Since the zones comprise both a partial area in the CD direction and a partial area in the MD direction of the fibrous web, the definition of drainage curves for each individual zone and the separate adjustment can advantageously achieve a particularly uniform and stable formation of the fibrous stock into paper.
  • retention agents or fillers in particular cationic, anionic or neutral polymers, can be used as additives.
  • the drainage can be controlled or regulated particularly effectively and efficiently.
  • the addition of the additives can advantageously in the HC strand, that is, in the "high consistency" strand, translated in the strand with high consistency, ie on the headbox of the screen, or in the field of Stoffaufianks, the
  • Strand with low pulp consistency that is on the white water side of the screen, admit.
  • the appropriate location should be chosen.
  • a zonal profile of the water weight can be predetermined and regulated for the entire longitudinal extent of the fibrous web.
  • the retention for the entire surface of the fibrous web can be regulated in a stable and uniform manner, as a result of which, over the entire extent of the fibrous web, a particularly stable and uniform shape is obtained. tion stops.
  • formation disturbances in the entire region of the fibrous web can be regulated or its occurrence avoided, in particular in the sections following the wet end, such as the drying section or the press section.
  • the invention further relates to a dewatering device, in particular as part of a paper machine having a fibrous web, wherein the dewatering device, in particular in a wet end, zonal distributed over the fibrous web, according to the method described above, in particular networked, control devices.
  • the addition devices in particular their outlet openings or nozzles, represent the output or Aufschaitungsish the individual zones.
  • the tubes, in particular their section towards the fibrous web to the valve are to be modeled by the skilled person in the control concept as delay lines.
  • valves which as actuators are capable of gradually releasing the additive addition, are located close to the respective outlet opening or the nozzle of a tube, then essentially only the delay time it takes for the additive particles to be applied to the Fall down fibrous web, in the rule concept to take into account.
  • the specification of the zonal profile of the water weight is the multi-dimensional, in particular two-dimensional, field of the setpoint variables, according to which the individual zone controllers are to be designed by a person skilled in the art.
  • the advantage of such a device lies precisely in the fact that retention can be uniformed and stabilized by means of the described embodiments of the device according to the invention, in particular of the zonal control circuits, via those known from the prior art.
  • FIG. 1 shows a side view of the wet end of an embodiment of a paper machine according to the invention with drainage elements and water weight sensors arranged below the wire;
  • Figure 2 is a plan view of the fibrous web with dashed indication of the zones;
  • Figure 3 is a side view of the HC strand with symbolic representation of the addition of additives, both directly into the HC strand (dashed line) and indirectly via the (recycled) white water;
  • Figure 4 is a plan view of the fibrous web including Entskyssanseiemen- th, sensor assemblies, control loops and adding devices;
  • FIG. 5 shows a course of the drainage curve for a zone; and
  • FIG. 6 shows a zonal profile of the water weight for the entire longitudinal extent of the fibrous web.
  • the paper machine 1 has a wet end 109 with a dewatering device 110, in which a pulp 5 by means of a headbox 9, in particular a dilution hydrogen casserole on a sieve 169, for example, a wire is applied.
  • the headbox 9 has along the machine transverse direction 66 (FIG. 2) of the fibrous web 13 at least one zonally submerged fibrous outlet opening 10.
  • Paper machine 1 includes even more games, such as a dryer section and a Press section, as well as a spool, which are not shown in Figure 1 for the sake of clarity.
  • water-weight sensors 54 for measuring the water weight of the pulp 5 are arranged behind at least one dewatering element 69.
  • the machine erection 65 is indicated in FIG. 1 by an arrow.
  • the water weight sensors 54 could also be arranged in the drainage elements 69, for example integrally formed therewith.
  • the sieve 169 is deflected and driven by means of a breast roll 165 headbox side.
  • the fibrous web 13 rests on the upper side of the sieve 169 and is continuously moved away from it in the machine direction 65 and thus from the headbox 9, the fibrous material 5 being continuously dewatered via the dewatering elements 69.
  • the drainage can be done by gravity or additionally by vacuum extraction.
  • the fibrous web 13 here comprises two zones 17, 21 (FIG. 2).
  • the zones 17, 21 each extend over half of the total transverse extent B of the fibrous web 13.
  • the fibrous web 13 could also comprise more than two zones 17, 21, for example, it could comprise as many zones as zonal Dilutionwasserzugabestellen the headbox 9 are present.
  • the zones 17, 21 extend both in the machine direction 65 and in the machine transverse direction 66.
  • the zones 17, 21 here extend over the entire longitudinal extension L of the fibrous web 13. However, they could also be shorter.
  • each of the zones 17, 21 in the machine erection 65 could be subdivided at least once, which would result in at least four zones. There could also be more, in particular significantly more than four zones.
  • the fibrous material 5 for influencing, in particular for stabilizing and equalizing, its zonal water weight additives 25 zones assignable.
  • the additives 25 the dewatering of the pulp 5 can be influenced zone by zone.
  • the dewatering of the pulp 5 by the additives 25 can be increased or reduced in zones.
  • the addition of the additives can be carried out, for example, in the HC strand 93.
  • the addition of the additive 25 can also take place indirectly via the white water from the LC strand 97. This is shown schematically in FIG. Further possible addition locations are in the area of the headbox 9, the dewatering device 110 or the sieve 169.
  • the additions of the additives 25 are carried out by means of zonal filling devices 29 distributed over the fibrous web 13 of the paper machine 1 (FIG. 4).
  • Such an adding device 29 is here a tube 33 as an admission instrument for the zonal water weight.
  • two feed devices 29 which together have a plurality of, namely two tubes 33.
  • Each adding device 29 is equipped with a nozzle 37, which influences the flow and distribution of the additives 25 on the fibrous web 13 of the paper machine 1 in the respective zone 17, 21 on the pipe 33.
  • the additives 25 are pumped into the tubes 33 directly or mixed with white water from the LC strand 97 of conveyors, such as pumps. These conveyors or pumps are not shown in FIG. 0 for the sake of clarity.
  • the setting of the individual zonal additions takes place with the aid of first control circuits 41, by means of which the pressure or the flow of the adding devices 29 can be adjusted.
  • the method implemented in the paper machine 1 carries out the selection of the adjustment of the additives 25 in terms of type and quantity autonomously and self-controlling.
  • the setting of the individual zonal additions takes place here additionally with the aid of second control circuits 45, by means of which the differential pressure between the adding devices 29 can be set.
  • the control circuits 41, 45 are thus networked.
  • the setting of the zonal additions is automatically carried out here. It could also be done manually by an operator.
  • the water weight values measured by the water weight sensors 54 are transmitted to a microprocessor 53.
  • the feedback loops 49 may be realized in their transmission parts by a bus, for example.
  • the microprocessor 53 compares the measured water weight values from the current process with stored zonal drainage curves 81 or with a stored zonal profile 101 and makes appropriate control statements by means of which deviations of the actual values from the soli values occur and second control circuits 41, 45 are acted upon.
  • the microprocessor 53 is part of the controller of the control loops 41, 45.
  • each feed device 29 has a ball valve valve 57.
  • the ball valve valves 57 actuated by the control signals of the first and second control circuits 41, 45, the addition of the additives 25 by gradually release the additive addition or shut off ( Figure 4).
  • the water weight sensors 54 arranged behind a drainage element 69 form a one-dimensional sensor arrangement 61.
  • the sensor arrangement 61 measures the zonal water weight transversely to the machine direction 65, that is to say in the cross-machine direction 66.
  • the one-dimensional sensor arrangement 61 in its entirety for zonal detection of the dewatering in the machine direction 65, forms a multidimensional, in this case a two-dimensional, sensor arrangement 73 of water-weight sensors 54.
  • the water weight for each zone 17, 21 can be regulated separately to an arbitrary position 77 along the fibrous web 13 of the paper machine 1 in the machine direction.
  • the Entsky ⁇ sansanskurve 81 is predetermined for each zone 17, 21 and separately einregelbar (Figure 5).
  • the additives 25 are retention aids or fillers, in particular cationic, anionic or neutral polymers. It could also be other paper chemicals, such as starch, but which may then have other purposes and other effects.
  • the addition of the additives 25 takes place here in the HC strand 93. It could also take place in the LC strand 97.
  • a zonal profile 101 of the water weight can be predetermined for the entire longitudinal extent of the fibrous web 13 and can be stimulated.
  • the planar zonal profile 101 has a nominal profile of the water volume for each zone 17, 21.
  • the social profile of zones 17, 21 is identical.
  • the desired profiles could, in particular in the case of more than one zone in the machine direction 65, in particular in the machine direction 65, also deviate from one another (FIG. 6).
  • the described wet end 109 comprises a dewatering device 110, which is part of the paper machine 1, which has the fibrous web 13.
  • the dewatering device 110 of the wet end 109 has zonal over the fibrous web 13 distributed, working according to the inventive method, interconnected, control devices 41, 45, 53 has.
  • the nozzles 37 could realize different jet geometries of the added additives 25, such as a cone-shaped jet geometry.
  • the process could also be used outside the paper industry. It could, for example, be used in industrial textile cleaning and care.
  • the additives 25 are then not paper chemicals, but specific fabrics for Textilkonditionie- tion, such as starch for ironing large, after cleaning wet or fabric webs, the addition of Bügeilands corresponding to a defined transverse or longitudinal profile (target profile) takes place.
  • the sensors could also measure other variables than the water weight.
  • the addition of the additives was then carried out in accordance with these feedback measured variables.
  • the addition of the additives 25 could also take place for example with a type of watering can or sieve, wherein each opening of the G confusekannensiebs is assigned to a zone of the fibrous web. In this way, particularly small zones could be regulated separately, if necessary, depending on each other.

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Abstract

L'invention concerne un procédé pour régler, notamment réguler, la masse d'eau de la matière fibreuse d'une machine à papier, notamment d'une caisse de tête contenant de l'eau de dilution, la matière fibreuse se présentant sous forme de bande. La bande de matière fibreuse comporte au moins deux zones dans lesquelles des additifs peuvent être ajoutés par zones afin d'influencer, notamment stabiliser et homogénéiser, la masse d'eau locale de la matière fibreuse. Les additifs permettent d'influencer, notamment d'augmenter ou de réduire, l'égouttage de la matière fibreuse par zones. L'invention porte également sur un dispositif d'égouttage, en tant que partie d'une machine à papier, comportant une bande de matière fibreuse. Ce dispositif d'égouttage comprend, notamment dans une partie humide, des dispositifs de régulation répartis par zones le long de la bande de matière fibreuse, ces dispositifs fonctionnant selon le procédé de l'invention et étant en particulier reliés en réseau.
PCT/EP2008/063520 2007-12-03 2008-10-09 Machine à papier et procédé pour influencer la masse d'eau par zones WO2009071360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007055689.8 2007-12-03
DE200710055689 DE102007055689A1 (de) 2007-12-03 2007-12-03 Papiermaschine und Verfahren zur Beeinflussung des zonalen Wassergewichts

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WO2009071360A1 true WO2009071360A1 (fr) 2009-06-11

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0985762A1 (fr) * 1998-09-03 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Caisse de tête pour la répartition d'une suspension fibreuse et des additifs
EP1024224A2 (fr) * 1999-01-28 2000-08-02 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour la fabrication d' une bande fibreuse
EP1021729B1 (fr) * 1998-05-11 2007-05-09 Honeywell International Inc. Commande de partie humide pour machine a fabrication de papier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1942529A1 (de) 1969-08-21 1971-02-25 Lippke Paul Verfahren und Einrichtung zum Feststellen und gegebenenfalls weiteren Auswerten des Querprofiles des Feuchtigkeitsgehaltes bewegter Bahnen aus Papier u.dgl.
US6092003A (en) 1998-01-26 2000-07-18 Honeywell-Measurex Corporation Paper stock shear and formation control
US6168687B1 (en) 1998-04-24 2001-01-02 Honeywell-Measurex Corporation System and method for sheet measurement and control in papermaking machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1021729B1 (fr) * 1998-05-11 2007-05-09 Honeywell International Inc. Commande de partie humide pour machine a fabrication de papier
EP0985762A1 (fr) * 1998-09-03 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Caisse de tête pour la répartition d'une suspension fibreuse et des additifs
EP1024224A2 (fr) * 1999-01-28 2000-08-02 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour la fabrication d' une bande fibreuse

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